通常，在即将被传输或记录的数据块的首部添加块同步信号。在接收或 读取数据的时候，检测同步信号以识别块的首部。这里，“块”指由多个数据 字或代码字组成的单元。例如数字音频磁带(DAT)中的块由总计36个符号 构成，包括标识(ID)数据的2个符号、ID奇偶校验的1个符号，以及数据 字的32个符号。一个符号在用八到十(8/10)代码，即记录代码编码之前为 8个位，而在用记录代码编码之后则是10个位。为了记录，首先用8/10代码 对每个形成块的8位符号编码，然后在该块的首部添加8/10代码的序列中不 存在的1个符号(10个位)的同步信号(同步字)。为了读取，通过检测同 步字来识别块的首部，然后逐个符号地对已编码的ID数据、奇偶校验以及 32个符号的数据字解码。8/10代码计划与用不归零倒转(NRZI)记录方法记 录的数据一起使用。然而，NRZI转换序列中一连串相同位的最大长度(下文 中称其为“Tmax”)是4，而Tmax不会连续重复超过2次。同步字包括在任 何连续重复2次的代码序列中不出现Tmax的模式，从而，可以区别同步字 和代码序列。
近来，在磁记录领域中活跃地研究了格栅编码部分响应(TCPR)方法。 这一方法结合部分响应特性和代码特性以增加传输信道(记录/读取信道)输 出序列之间的欧几里德距离(自由平方欧几里德距离：d2 free)。d2 free的增加等 价于信号电平的增加。所以，TCPR方法改善检测时数据的信噪比(SNR)。 一般称TCPR方法中使用的代码为“格码(trellis code)”。
这里要注意，通常用作部分响应的扩展部分响应类4(下文中称其为 “EPR4”)提供一种在采样点(存在符号的地方)将为彼此的单位脉冲响应 而均衡的波形均衡为(1，1，-1，-1)。公式(1)表达了EPR4的系统多 项式等式：
G(D)＝(1-D)(1+D)2........................................ (1) 其中，D是1位延迟算符。
图12展示了EPR4的状态转换图，而图13展示了EPR4的格子图。由 EPR4的格子图中的两位字节指示的最小欧几里德距离d2 free是：
d2 free＝((+1)-(0))2+((+1)-(0))2+((-1)-(0))2+ ((-1)-(0))2
 ＝4
在使用EPR4和调制码约束进行最大似然解码的格栅编码部分响应类4 (下文中称其为“TCEPR4”)中，可以通过约束16/18代码将平方欧几里德 距离d2 free从4增加到6，从而可以为EPR4获得1.8dB的维特比检测增益。
由于TCEPR4的维特比解码器在每预定18个位处操作，所以即使是1 位的相位滞后也将导致对完全不同的位解码。
所以，为在每18个位处重置TCEPR4维特比解码器，必须检测同步。 必须用次级EPR4维特比解码器使同步检测自身的检测增益达到1.8dB。
这里要注意，块同步信号检测的精确度将极大地影响数据接收或读取的 数据的质量。例如，如果因任何干扰而不能检测到同步信号，那么将丢失所 有数据。同样，如果错误地检测了同步信号，那么从错误的检测直到正确检 测到同步信号的期间的数据将丢失。此外，在DAT中，例如，如果错误地检 测了同步字，那么也会错误地检测到ID数据。ID数据包括地址信息，而如 果使用错误地检测到的地址将其写入存储器，那么也有可能损毁其它块中的 数据。

因此，本发明的目的在于通过使得能够从代码序列中区分同步信号，并 能够在接收或读取数据时，从多个代码字中识别所形成的块的首部，从而克 服现有技术的上述缺陷。
本发明的另一个目的在于通过保持同步字模式中的误差与16/18代码之 间的距离，并降低无法通过自校正得到检测的概率，从而提高由EPR4检测 到的同步字模式。
上述目的可以通过提供一种数据传输方法而实现，其中通过在由多个代 码字组成的块的首部添加块同步信号来传输数据，其中当代码序列中一连串 相同位的最大长度为Tmax＝8时，块同步信号具有多于一个的连续9个相同 位。
同样，上述方法可以通过提供一种数据传输方法而实现，其中通过在由 多个代码字组成的块的首部添加块同步信号来传输数据，其中在具有随时间 改变的结构，并用于对包括来自传输信道的输出序列的块同步信号的代码序 列的最大似然性检测的检测格子中，在起点状态中彼此不同的块信号分别是 唯一的，并在终点彼此相同。
同样，上述方法可以通过提供一种块同步信号检测方法而实现，该方法 用于检测作为包括多个代码字的块的首部的附属物传输的块同步信号，其中： 在具有随时间改变的结构并用于对包括来自传输信道的输出序列的块同步信 号的代码序列的最大似然性检测的检测格子中，在起点状态中彼此不同的块 信号分别是唯一的，并在终点彼此相同；并且使用具有检测窗的窗信号，即 基于检测到的同步信号进行块同步信号检测。
同样，上述方法可以通过提供一种块同步信号检测方法而实现，该方法 用于检测作为包括多个代码字的块的首部的附属物传输的块同步信号，其中： 在具有随时间改变的结构并用于对包括来自传输信道的输出序列的块同步信 号的代码序列的最大似然性检测的检测格子中，在起点状态中彼此不同的块 信号分别是唯一的，并在终点彼此相同；并且检测块同步信号，根据检测到 的块同步信号的唯一性，用块同步信号检测在检测格子中的TCPR维特比检 测器的起点状态，并在检测块同步信号之后预置分支尺度。
同样，上述方法可以通过提供一种播放器而实现，其中从具有预定特性 的传输信道的输出序列中检测包括传输信号的代码序列，该播放器包括：不 随时间改变检测工具，用于从传输信道的输出序列中检测包括块同步信号的 代码序列；同步信号检测工具，用于从不随时间改变检测工具的输出信号中 检测块同步信号，并输出该信息；维特比检测工具，用从同步信号检测工具 输出的块同步信息将其初始化，以使用具有随时间改变的结构，从传输信道 输出序列中，进行对包括块同步信号的代码序列的维特比检测；以及窗信号 发生工具，用于基于由同步信号检测工具检测到的块同步信号和从维特比检 测工具输出的检测结果，产生具有块同步信号检测窗的窗信号；同步信号检 测工具使用由窗信号发生工具产生的窗信号检测块同步信号。
通过结合附图对本发明的优选实施例进行详细描述，本发明的上述和其 它目的、特性、优点将会变得更加清楚。

图1是本发明的播放器的方框图。
图2展示TCPR的格子约束。
图3展示本发明的播放器中用作记录介质的磁带上的磁道。
图4展示磁带上的磁道格式。
图5A至5C展示用于展示对本发明的播放器中的窗信号发生器和同步字 检测器的操作的时序图。
图6展示同步字检测器中如何检测同步字。
图7展示为计算EPR4中的平方欧几里德距离，从TCEPR4的四格子约 束的初始状态下的48位数据的16/18转换得到的54位代码和36位同步字模 式。
图8A和8B展示通过逐位移动54位的16/18代码产生36位代码，并计 算同步字模式及其错误模式之间的平方欧几里德距离的状态。
图9展示通过逐位移动36位同步字模式、其错误模式、以及在36位同 步字之前和之后添加18个位而得到的72位信号，计算EPR4中同步字模式 及其错误模式之间的欧几里德距离的状态。
图10展示EPR4的同步字模式和格子图。
图11展示16/18(0，7)代码的同步字模式和格子图。
图12是EPR4的状态转换图。
图13是EPR4的格子图。

下面将参考附图描述本发明的实施例。
举例说来，本发明适用于结构如图1所示的播放器20。播放器20采用 TCEPR方法，其使用随时间变化的格码。
本发明的播放器20中采用的TCEPR4中的16/18转换由对应于表1所示 状态的代码之间的关系所约束。
表1   状态   S   Z   P   ZP   PZ   ZH   PH   ZPH   PZH   ZT   PT   ZPT   PZT   S0   8   8   8   8   8   8   3   3   7   5   5   4   4   S1   8   8   8   8   8   3   8   3   4   5   5   4   4   S2   4   8   8   8   8   3   8   7   3   5   5   4   4   S3   4   8   8   8   8   8   3   4   3   5   5   4   4
表1中，S：ADS起始状态；Z：连续为0的最大数量；P：连续为1的 最大数量；ZP：连续为01的最大数量；PZ：连续为10的最大数量；ZH：在 代码字的首部连续为0的最大数量；PH：在代码字的首部连续为1的最大数 量；ZPH：在代码字的首部连续为01的最大数量；PZH：在代码字的首部连 续为10的最大数量；ZT：在代码字的尾部连续为0的最大数量；PT：在代 码字的尾部连续为1的最大数量；ZPT：在代码字的尾部连续为01的最大数 量；PZT：在代码字的尾部连续为10的最大数量，并且1≤ADS≤11。
同样，也满足图2所示的TCPR的格子约束。
播放器20包括：均衡器3，从介质1经由读出放大器2向其提供读出信 号；PLL电路5和PRML维特比检测器6，从均衡器3经由采样器4分别向 其提供输出信号；TCPR维特比检测器8，从采样器4经由延迟元件7向其提 供输出信号；检测器9，从TCPR维特比检测器8向其提供输出信号；同步 字检测器10，从PRML维特比检测器6向其提供输出信号；ID检测器11， 从解码器9向其提供输出信号；奇偶校验电路12，从ID检测器11向其提供 输出信号；窗信号发生器13，从奇偶校验电路12向其提供输出信号；及其 它部件。在播放器20中，来自窗信号发生器13的输出被提供给同步字检测 器10，而同步字检测器10的输出被提供给TCPR维特比检测器8。
这里要注意，介质1例如是磁带，在关于图3所示的磁带传送方向倾斜 的磁道上以图4所示的磁道格式记录着信息。一个磁道在各为3块的前同步 码和后同步码之间具有336个数据块。一个块由4字节同步字、8字节ID信 息以及128字节数据组成。
在播放器20中，由均衡器3将来自介质1并由读出放大器2放大的信号 均衡到预定部分响应特性，然后由采样器采样。将由采样器采样后的信号提 供给PLL电路5，经由PRML维特比检测器6提供给同步字检测器10，并且 还经由延迟元件7提供给TCPR维特比检测器8。
PLL电路5从由采样器4采样后的信号中提取时钟。采样器4以及PRML 维特比检测器6、TCPR维特比检测器8、解码器9、同步字检测器10等根据 PLL电路5给出的时钟操作。
PRML维特比检测器6使用不包括随时间变化的格码的特性的检测格子 来检测数据。PRML维特比检测器6不必了解代码字的任何边界，因此可以 同步检测数据。
同步字检测器10使用从窗信号发生器13提供的窗信号Sync_window来 检测有关由PRML维特比检测器6检测出的位串的同步字。同步字检测器10 向TCPR维特比检测器8提供同步字检测信号，同时向TCPR维特比检测器 8提供状态指定信号，其指示TCPR维特比检测器8的哪个状态的似然性将 得以增加。
TCPR维特比检测器8使用包括随时间变化的格码的特性的检测格子来 检测数据。除非其了解代码器的边界，否则无法正确操作。因此，TCPR维 特比检测器8在用从同步字检测器10提供的状态指定信号初始化其似然性， 并由同步字检测信号使其同步之后，开始检测一块数据。
将由TCPR维特比检测器8检测到的数据提供给解码器9，解码器9将 把该数据解码为代码字。
需要注意，提供延迟元件7是为了将从采样器4提供给TCPR维特比检 测器8的信号延迟一段时间，该时间长度等于由PRML维特比检测器6和同 步字检测器10的内部延迟导致的同步字检测信号的延迟的时间长度。
ID检测器11检测来自解码器9的输出信号中包括的ID信息，并将其提 供给奇偶校验电路12。
奇偶校验电路12校验由ID检测器11检测出的ID信息的奇偶性，并在 ID信息的奇偶性正常时，向窗信号发生器13提供奇偶性OK信号。
基于从奇偶校验电路12提供的奇偶性OK信号，窗信号发生器13产生 窗信号Sync_window(同步窗)，其指示来自介质1的读出信号中包括的同步 字和ID信息之间的间隔时间，如图5A所示，并将窗信号Sync_window提供 给同步字检测器10。
在向其提供了指示来自介质1的读出信号中包括的同步字和ID信息之间 的间隔时间的窗信号Sync_window的情况下，同步字检测器10使用基于从 奇偶校验电路12提供的奇偶性OK信号产生的窗信号Sync_window，检测关 于PRML维特比检测器6检测出的位串的同步字。从而，在除了由窗信号 Sync_window指示的检测窗之外的任何时期都能无错地检测任何同步字，如 图5B所示，并且在不能检测到任何同步字时也能在下一定时检测同步，如图 5C所示。
如图6所示，同步字检测器10通过认为具有误差的模式是同步字，来以 更高的概率检测同步字，所述误差中，同步字之间平方欧几里德距离小于4， 以允许在同步字中发生可能存在的误差。此时，通过使同步字与从代码字的 欧几里德距离为4的误差分离大于1的距离，将得到对同步字的无错检测。
选择同步字模式以满足下述条件1至3。
条件1：
同步字应该满足TCEPR4格子约束。同步字的前同步码和后同步码之间 的关系不受16/18转换的任何关系约束。然而，应该注意，同步字和代码字 之间的关系满足16/18转换的关系约束。
条件2：
同步字应该包括至少一个Z＝9和一个P＝9，即，总计3个，以保持与 代码字的距离。
条件3：
为防止在任何错误的位置重置，当其被移动(shift)时，将四个初始状 态下的、包括其错误模式的同步字模式设置为彼此不相似。
为满足条件1至3，下面将描述对表2所示同步字模式(同步模式)的 确定。
表2  初始状态                同步模式   错误模式  最终状态     S1  001111111110000110000000001111111110     109     S1     S2  110011111111100110000000001111111110     107     S1     S3  110111111111000110000000001111111110     114     S1     S4  000111111111000110000000001111111110     109     S1
首先从48位数据产生16/18转换后的54位代码，其具有TCEPR4的四 个格子约束下的初始状态，计算EPR4中，四个格子约束下的初始状态和所 有36位信号之间的平方欧几里德距离，并且视平方欧几里德距离小于4的同 步字模式为错误模式，如图7所示。
接下来，计算同步字模式及其错误模式和所有36位16/18代码之间的平 方欧几里德距离，并确认距离大于5。
然后，为在移动16/18代码时保持与该模式的距离，将54位16/18代码 逐位移动，以产生36位代码，并计算同步字模式及其错误模式之间的平方欧 几里德距离，如图8A和8B所示。
同样，如果存在因代码字和同步字的结合而与同步字相似的任何模式， 那么将有可能在错误的位置检测到同步字。为防止包括一连串同步字和代码 字的信号使得在任何错误的位置导致任何重置，产生72位信号，所述72位 信号由36位同步字模式及其错误模式组成，其中，在任一端添加18个位， 将72位信号逐位移动，如图9所示，计算同步字模式及其错误模式之间的平 方欧几里德距离，并确认距离大于5。
图10展示EPR4的同步字模式和格子图。
同样，对应于表2所示的四个初始状态，同步字模式的错误模式的平方 欧几里德距离如下。
即，表3至5给出了在初始状态S0中的同步字模式的错误模式的每位平 方欧几里德距离。
                                                 表3                        在初始状态0(001111111110000110000000001111111110)中的同步字模式                 错误模式         每位平方欧几里德距离 001111111110000100000000001111111110 001111111110000010000000001111111110 000101010100000110000000001111111110 001101010100000110000000001111111110 001111010100000110000000001111111110 001111110100000110000000001111111110 001111111100000110000000001111111110 001010101010000110000000001111111110 001110101010000110000000001111111110 001111101010000110000000001111111110 001111111010000110000000001111111110 000101010110000110000000001111111110 001101010110000110000000001111111110 001111010110000110000000001111111110 001111110110000110000000001111111110 001010101110000110000000001111111110 001110101110000110000000001111111110 001111101110000110000000001111111110 000101011110000110000000001111111110 001101011110000110000000001111111110 001111011110000110000000001111111110 001010111110000110000000001111111110 001110111110000110000000001111111110 000101111110000110000000001111111110 001101111110000110000000001111111110 001011111110000110000000001111111110 000111111110000110000000001111111110 001111111110000110000000001010101000 001111111110000110000000001110101000 001111111110000110000000001111101000 001111111110000110000000001010100100 001111111110000110000000001110100100 001111111110000110000000001010010100 001111111110000110000000000101010100 001111111110000110000000001101010100 001111111110000110000000001011010100 001111111110000110000000001111010100 001111111110000110000000001010110100  000000000000000011110000000000000000  000000000000000111100000000000000000  001100000000110000000000000000000000  000011000000110000000000000000000000  000000110000110000000000000000000000  000000001100110000000000000000000000  000000000011110000000000000000000000  000110000001100000000000000000000000  000001100001100000000000000000000000  000000011001100000000000000000000000  000000000111100000000000000000000000  001100000011000000000000000000000000  000011000011000000000000000000000000  000000110011000000000000000000000000  000000001111000000000000000000000000  000110000110000000000000000000000000  000001100110000000000000000000000000  000000011110000000000000000000000000  001100001100000000000000000000000000  000011001100000000000000000000000000  000000111100000000000000000000000000  000110011000000000000000000000000000  000001111000000000000000000000000000  001100110000000000000000000000000000  000011110000000000000000000000000000  000111100000000000000000000000000000  001111000000000000000000000000000000  000000000000000000000000000110000010  000000000000000000000000000001100010  000000000000000000000000000000011010  000000000000000000000000000110001010  000000000000000000000000000001101010  000000000000000000000000000110101000  000000000000000000000000001100000000  000000000000000000000000000011000000  000000000000000000000000000111010000  000000000000000000000000000000110000  000000000000000000000000000110010100
                                              表4                        在初始状态0(001111111110000110000000001111111110)中的同步字模式                错误模式          每位平方欧几里德距离 001111111110000110000000001110110100 001111111110000110000000001111110100 001111111110000110000000001010101100 001111111110000110000000001110101100 001111111110000110000000001111101100 001111111110000110000000001111111100 001111111110000110000000001010101010 001111111110000110000000001110101010 001111111110000110000000001111101010 001111111110000110000000001111111010 001111111110000110000000000101010110 001111111110000110000000001101010110 001111111110000110000000001111010110 001111111110000110000000001111110110 001111111110000110000000001010101110 001111111110000110000000001110101110 001111111110000110000000001111101110 001111111110000110000000000101011110 001111111110000110000000001101011110 001111111110000110000000001111011110 001111111110000110000000001010111110 001111111110000110000000001110111110 001111111110000110000000000101111110 001111111110000110000000001101111110 001111111110000110000000001011111110 001111111110000110000000000111111110 001111111110000110100000001111111110 001111111110000110010000001111111110 001111111110000110001000001111111110 001111111110000110101000001111111110 001111111110000110000100001111111110 001111111110000110010100001111111110 001111111110000110000010001111111110 001111111110000110001010001111111110 001111111110000110101010001111111110 001111111110000110000001001111111110 001111111110000110000101001111111110 001111111110000110010101001111111110 001111111110000110000000101111111110 001111111110000110000010101111111110  000000000000000000000000000001110100  000000000000000000000000000000001100  000000000000000000000000000110000101  000000000000000000000000000001100101  000000000000000000000000000000011101  000000000000000000000000000000000011  000000000000000000000000000110000001  000000000000000000000000000001100001  000000000000000000000000000000011001  000000000000000000000000000000000111  000000000000000000000000001100000011  000000000000000000000000000011000011  000000000000000000000000000000110011  000000000000000000000000000000001111  000000000000000000000000000110000110  000000000000000000000000000001100110  000000000000000000000000000000011110  000000000000000000000000001100001100  000000000000000000000000000011001100  000000000000000000000000000000111100  000000000000000000000000000110011000  000000000000000000000000000001111000  000000000000000000000000001100110000  000000000000000000000000000011110000  000000000000000000000000000111100000  000000000000000000000000001111000000  000000000000000000111100000000000000  000000000000000000011110000000000000  000000000000000000001111000000000000  000000000000000000110011000000000000  000000000000000000000111100000000000  000000000000000000011001100000000000  000000000000000000000011110000000000  000000000000000000001100110000000000  000000000000000000110000110000000000  000000000000000000000001111000000000  000000000000000000000110011000000000  000000000000000000011000011000000000  000000000000000000000000111100000000  000000000000000000000011001100000000
                                                  表5                       在初始状态0(001111111110000110000000001111111110)中的同步字模式                错误模式          每位平方欧几里德距离 001111111110000110001010101111111110 001111111110000110101010101111111110 001111111110000110000000011111111110 001111111110000110000001011111111110 001111111110000110000101011111111110 001111111110000110010101011111111110 001111111110000110000000001010101001 001111111110000110000000001110101001 001111111110000110000000001111101001 001111111110000110000000000101010101 001111111110000110000000001101010101 001111111110000110000000001111010101 001111111110000110000000001111110101 001111111110000110000000001010101101 001111111110000110000000001110101101 001111111110000110000000001111101101 001111111110000110000000001111111101 001111111110000110000000001111111111 101111111110000110000000001111111110 011111111110000110000000001111111110 001111111111000110000000001111111110 001111111110100110000000001111111110 001111111110010110000000001111111110 001111111111010110000000001111111110 001111111110001110000000001111111110 001111111110101110000000001111111110 001111111110000111000000001111111110 001111111110000111010000001111111110 001111111110000111010100001111111110 001111111110000111010101001111111110 001111111110000111010101011111111110  000000000000000000001100001100000000  000000000000000000110000001100000000  000000000000000000000000011110000000  000000000000000000000001100110000000  000000000000000000000110000110000000  000000000000000000011000000110000000  000000000000000000000000000110000011  000000000000000000000000000001100011  000000000000000000000000000000011011  000000000000000000000000001100000001  000000000000000000000000000011000001  000000000000000000000000000000110001  000000000000000000000000000000001101  000000000000000000000000000110000100  000000000000000000000000000001100100  000000000000000000000000000000011100  000000000000000000000000000000000010  000000000000000000000000000000000001  111100000000000000000000000000000000  011110000000000000000000000000000000  000000000001111000000000000000000000  000000000000111100000000000000000000  000000000000011110000000000000000000  000000000001100110000000000000000000  000000000000001111000000000000000000  000000000000110011000000000000000000  000000000000000001111000000000000000  000000000000000001100110000000000000  000000000000000001100001100000000000  000000000000000001100000011000000000  000000000000000001100000000110000000
同样，表6至8给出了在初始状态S1中的同步字模式的错误模式的每位平方欧几里德距离。
                                                  表6                       在初始状态1(110011111111100110000000001111111110)中的同步字模式     错误模式          每位平方欧几里德距离 110011111111100100000000001111111110 110011111111100010000000001111111110 110001010101000110000000001111111110 110011010101000110000000001111111110 110011110101000110000000001111111110 110011111101000110000000001111111110 110011111111000110000000001111111110 110010101010100110000000001111111110 110011101010100110000000001111111110 110011111010100110000000001111111110 110011111110100110000000001111111110 110001010101100110000000001111111110 110011010101100110000000001111111110 110011110101100110000000001111111110 110011111101100110000000001111111110 110010101011100110000000001111111110 110011101011100110000000001111111110 110011111011100110000000001111111110 110001010111100110000000001111111110 110011010111100110000000001111111110 110011110111100110000000001111111110 110010101111100110000000001111111110 110011101111100110000000001111111110 110001011111100110000000001111111110 110011011111100110000000001111111110 110010111111100110000000001111111110 110001111111100110000000001111111110 100011111111100110000000001111111110 010011111111100110000000001111111110 110011111111100110000000001010101000 110011111111100110000000001110101000 110011111111100110000000001111101000 110011111111100110000000001010100100 110011111111100110000000001110100100 110011111111100110000000001010010100 110011111111100110000000000101010100 110011111111100110000000001101010100 110011111111100110000000001011010100  000000000000000011110000000000000000  000000000000000111100000000000000000  000011000000001100000000000000000000  000000110000001100000000000000000000  000000001100001100000000000000000000  000000000011001100000000000000000000  000000000000111100000000000000000000  000001100000011000000000000000000000  000000011000011000000000000000000000  000000000110011000000000000000000000  000000000001111000000000000000000000  000011000000110000000000000000000000  000000110000110000000000000000000000  000000001100110000000000000000000000  000000000011110000000000000000000000  000001100001100000000000000000000000  000000011001100000000000000000000000  000000000111100000000000000000000000  000011000011000000000000000000000000  000000110011000000000000000000000000  000000001111000000000000000000000000  000001100110000000000000000000000000  000000011110000000000000000000000000  000011001100000000000000000000000000  000000111100000000000000000000000000  000001111000000000000000000000000000  000011110000000000000000000000000000  011110000000000000000000000000000000  111100000000000000000000000000000000  000000000000000000000000000110000010  000000000000000000000000000001100010  000000000000000000000000000000011010  000000000000000000000000000110001010  000000000000000000000000000001101010  000000000000000000000000000110101000  000000000000000000000000001100000000  000000000000000000000000000011000000  000000000000000000000000000111010000
                                                 表7                          在初始状态1(110011111111100110000000001111111110)中的同步字模式               错误模式            每位平方欧几里德距离  110011111111100110000000001111010100  110011111111100110000000001010110100  110011111111100110000000001110110100  110011111111100110000000001111110100  110011111111100110000000001010101100  110011111111100110000000001110101100  110011111111100110000000001111101100  110011111111100110000000001111111100  110011111111100110000000001010101010  110011111111100110000000001110101010  110011111111100110000000001111101010  110011111111100110000000001111111010  110011111111100110000000000101010110  110011111111100110000000001101010110  110011111111100110000000001111010110  110011111111100110000000001111110110  110011111111100110000000001010101110  110011111111100110000000001110101110  110011111111100110000000001111101110  110011111111100110000000000101011110  110011111111100110000000001101011110  110011111111100110000000001111011110  110011111111100110000000001010111110  110011111111100110000000001110111110  110011111111100110000000000101111110  110011111111100110000000001101111110  110011111111100110000000001011111110  110011111111100110000000000111111110  110011111111100110100000001111111110  110011111111100110010000001111111110  110011111111100110001000001111111110  110011111111100110101000001111111110  110011111111100110000100001111111110  110011111111100110010100001111111110  110011111111100110000010001111111110  110011111111100110001010001111111110  110011111111100110101010001111111110  110011111111100110000001001111111110  110011111111100110000101001111111110  110011111111100110010101001111111110  000000000000000000000000000000110000  000000000000000000000000000110010100  000000000000000000000000000001110100  000000000000000000000000000000001100  000000000000000000000000000110000101  000000000000000000000000000001100101  000000000000000000000000000000011101  000000000000000000000000000000000011  000000000000000000000000000110000001  000000000000000000000000000001100001  000000000000000000000000000000011001  000000000000000000000000000000000111  000000000000000000000000001100000011  000000000000000000000000000011000011  000000000000000000000000000000110011  000000000000000000000000000000001111  000000000000000000000000000110000110  000000000000000000000000000001100110  000000000000000000000000000000011110  000000000000000000000000001100001100  000000000000000000000000000011001100  000000000000000000000000000000111100  000000000000000000000000000110011000  000000000000000000000000000001111000  000000000000000000000000001100110000  000000000000000000000000000011110000  000000000000000000000000000111100000  000000000000000000000000001111000000  000000000000000000111100000000000000  000000000000000000011110000000000000  000000000000000000001111000000000000  000000000000000000110011000000000000  000000000000000000000111100000000000  000000000000000000011001100000000000  000000000000000000000011110000000000  000000000000000000001100110000000000  000000000000000000110000110000000000  000000000000000000000001111000000000  000000000000000000000110011000000000  000000000000000000011000011000000000
                                                表8                     在初始状态1(110011111111100110000000001111111110)中的同步字模式               错误模式            每位平方欧几里德距离  110011111111100110000000101111111110  110011111111100110000010101111111110  110011111111100110001010101111111110  110011111111100110101010101111111110  110011111111100110000000011111111110  110011111111100110000001011111111110  110011111111100110000101011111111110  110011111111100110010101011111111110  110011111111100110000000001010101001  110011111111100110000000001110101001  110011111111100110000000001111101001  110011111111100110000000000101010101  110011111111100110000000001101010101  110011111111100110000000001111010101  110011111111100110000000001111110101  110011111111100110000000001010101101  110011111111100110000000001110101101  110011111111100110000000001111101101  110011111111100110000000001111111101  110011111111100110000000001111111111  111011111111100110000000001111111110  110111111111100110000000001111111110  110011111111110110000000001111111110  110011111111101110000000001111111110  110011111111100111000000001111111110  110011111111100111010000001111111110  110011111111100111010100001111111110  110011111111100111010101001111111110  110011111111100111010101011111111110  000000000000000000000000111100000000  000000000000000000000011001100000000  000000000000000000001100001100000000  000000000000000000110000001100000000  000000000000000000000000011110000000  000000000000000000000001100110000000  000000000000000000000110000110000000  000000000000000000011000000110000000  000000000000000000000000000110000011  000000000000000000000000000001100011  000000000000000000000000000000011011  000000000000000000000000001100000001  000000000000000000000000000011000001  000000000000000000000000000000110001  000000000000000000000000000000001101  000000000000000000000000000110000100  000000000000000000000000000001100100  000000000000000000000000000000011100  000000000000000000000000000000000010  000000000000000000000000000000000001  001111000000000000000000000000000000  000111100000000000000000000000000000  000000000000011110000000000000000000  000000000000001111000000000000000000  000000000000000001111000000000000000  000000000000000001100110000000000000  000000000000000001100001100000000000  000000000000000001100000011000000000  000000000000000001100000000110000000
同样，表9至11给出了在初始状态S2中的同步字模式的错误模式的每位平方欧几里德距离。
                                                表9                     在初始状态2(110111111111000110000000001111111110)中的同步字模式                错误模式         每位平方欧几里德距离  110111111111000100000000001111111110  110111111111000010000000001111111110  100010101010000110000000001111111110  110010101010000110000000001111111110  110110101010000110000000001111111110  110111101010000110000000001111111110  110111111010000110000000001111111110  110111111110000110000000001111111110  110101010101000110000000001111111110  110111010101000110000000001111111110  110111110101000110000000001111111110  110111111101000110000000001111111110  100010101011000110000000001111111110  110010101011000110000000001111111110  110110101011000110000000001111111110  110111101011000110000000001111111110  110111111011000110000000001111111110  110101010111000110000000001111111110  110111010111000110000000001111111110  110111110111000110000000001111111110  100010101111000110000000001111111110  110010101111000110000000001111111110  110110101111000110000000001111111110  110111101111000110000000001111111110  110101011111000110000000001111111110  110111011111000110000000001111111110  100010111111000110000000001111111110  110010111111000110000000001111111110  110110111111000110000000001111111110  110101111111000110000000001111111110  100011111111000110000000001111111110  110011111111000110000000001111111110  101011111111000110000000001111111110  100111111111000110000000001111111110  010111111111000110000000001111111110  110111111111000110000000001010101000  110111111111000110000000001110101000  110111111111000110000000001111101000  000000000000000011110000000000000000  000000000000000111100000000000000000  011000000000011000000000000000000000  000110000000011000000000000000000000  000001100000011000000000000000000000  000000011000011000000000000000000000  000000000110011000000000000000000000  000000000001111000000000000000000000  000011000000110000000000000000000000  000000110000110000000000000000000000  000000001100110000000000000000000000  000000000011110000000000000000000000  011000000001100000000000000000000000  000110000001100000000000000000000000  000001100001100000000000000000000000  000000011001100000000000000000000000  000000000111100000000000000000000000  000011000011000000000000000000000000  000000110011000000000000000000000000  000000001111000000000000000000000000  011000000110000000000000000000000000  000110000110000000000000000000000000  000001100110000000000000000000000000  000000011110000000000000000000000000  000011001100000000000000000000000000  000000111100000000000000000000000000  011000011000000000000000000000000000  000110011000000000000000000000000000  000001111000000000000000000000000000  000011110000000000000000000000000000  011001100000000000000000000000000000  000111100000000000000000000000000000  010110100000000000000000000000000000  011110000000000000000000000000000000  111100000000000000000000000000000000  000000000000000000000000000110000010  000000000000000000000000000001100010  000000000000000000000000000000011010
                                               表10                     在初始状态2(11011111111000110000000001111111110)中的同步字模式               错误模式          每位平方欧几里德距离  110111111111000110000000001010100100  110111111111000110000000001110100100  110111111111000110000000001010010100  110111111111000110000000000101010100  110111111111000110000000001101010100  110111111111000110000000001011010100  110111111111000110000000001111010100  110111111111000110000000001010110100  110111111111000110000000001110110100  110111111111000110000000001111110100  110111111111000110000000001010101100  110111111111000110000000001110101100  110111111111000110000000001111101100  110111111111000110000000001111111100  110111111111000110000000001010101010  110111111111000110000000001110101010  110111111111000110000000001111101010  110111111111000110000000001111111010  110111111111000110000000000101010110  110111111111000110000000001101010110  110111111111000110000000001111010110  110111111111000110000000001111110110  110111111111000110000000001010101110  110111111111000110000000001110101110  110111111111000110000000001111101110  110111111111000110000000000101011110  110111111111000110000000001101011110  110111111111000110000000001111011110  110111111111000110000000001010111110  110111111111000110000000001110111110  110111111111000110000000000101111110  110111111111000110000000001101111110  110111111111000110000000001011111110  110111111111000110000000000111111110  110111111111000110100000001111111110  110111111111000110010000001111111110  110111111111000110001000001111111110  110111111111000110101000001111111110  110111111111000110000100001111111110  110111111111000110010100001111111110  000000000000000000000000000110001010  000000000000000000000000000001101010  000000000000000000000000000110101000  000000000000000000000000001100000000  000000000000000000000000000011000000  000000000000000000000000000111010000  000000000000000000000000000000110000  000000000000000000000000000110010100  000000000000000000000000000001110100  000000000000000000000000000000001100  000000000000000000000000000110000101  00000000000000000000000000000110011  000000000000000000000000000000011101  000000000000000000000000000000000011  000000000000000000000000000110000001  000000000000000000000000000001100001  000000000000000000000000000000011001  000000000000000000000000000000000111  000000000000000000000000001100000011  000000000000000000000000000011000011  000000000000000000000000000000110011  000000000000000000000000000000001111  000000000000000000000000000110000110  000000000000000000000000000001100110  000000000000000000000000000000011110  000000000000000000000000001100001100  000000000000000000000000000011001100  000000000000000000000000000000111100  000000000000000000000000000110011000  000000000000000000000000000001111000  000000000000000000000000001100110000  000000000000000000000000000011110000  000000000000000000000000000111100000  000000000000000000000000001111000000  000000000000000000111100000000000000  000000000000000000011110000000000000  000000000000000000001111000000000000  000000000000000000110011000000000000  000000000000000000000111100000000000  000000000000000000011001100000000000
                                                 表11                      在初始状态2(110111111111000110000000001111111110)中的同步字模式               错误模式       每位平方欧几里德距离  110111111111000110000010001111111110  110111111111000110001010001111111110  110111111111000110101010001111111110  110111111111000110000001001111111110  110111111111000110000101001111111110  110111111111000110010101001111111110  110111111111000110000000101111111110  110111111111000110000010101111111110  110111111111000110001010101111111110  110111111111000110101010101111111110  110111111111000110000000011111111110  110111111111000110000001011111111110  110111111111000110000101011111111110  110111111111000110010101011111111110  110111111111000110000000001010101001  110111111111000110000000001110101001  110111111111000110000000001111101001  110111111111000110000000000101010101  110111111111000110000000001101010101  110111111111000110000000001111010101  110111111111000110000000001111110101  110111111111000110000000001010101101  110111111111000110000000001110101101  110111111111000110000000001111101101  110111111111000110000000001111111101  110111111111000110000000001111111111  111111111111000110000000001111111110  110111111111100110000000001111111110  110111111111010110000000001111111110  110111111111001110000000001111111110  110111111111101110000000001111111110  110111111111000111000000001111111110  110111111111000111010000001111111110  110111111111000111010100001111111110  110111111111000111010101001111111110  110111111111000111010101011111111110  000000000000000000000011110000000000  000000000000000000001100110000000000  000000000000000000110000110000000000  000000000000000000000001111000000000  000000000000000000000110011000000000  000000000000000000011000011000000000  000000000000000000000000111100000000  000000000000000000000011001100000000  000000000000000000001100001100000000  000000000000000000110000001100000000  000000000000000000000000011110000000  000000000000000000000001100110000000  000000000000000000000110000110000000  000000000000000000011000000110000000  000000000000000000000000000110000011  000000000000000000000000000001100011  000000000000000000000000000000011011  000000000000000000000000001100000001  000000000000000000000000000011000001  000000000000000000000000000000110001  000000000000000000000000000000001101  000000000000000000000000000110000100  000000000000000000000000000001100100  000000000000000000000000000000011100  000000000000000000000000000000000010  000000000000000000000000000000000001  001111000000000000000000000000000000  000000000000111100000000000000000000  000000000000011110000000000000000000  000000000000001111000000000000000000  000000000000110011000000000000000000  000000000000000001111000000000000000  000000000000000001100110000000000000  000000000000000001100001100000000000  000000000000000001100000011000000000  000000000000000001100000000110000000
同样，表12至14给出了在初始状态S3中的同步字模式的错误模式的每位平方欧几里德距离。
                                             表12                    在初始状态3(000111111111000110000000001111111110)中的同步字模式               错误模式        每位平方欧几里德距离  000111111111000100000000001111111110  000111111111000010000000001111111110  000010101010000110000000001111111110  000110101010000110000000001111111110  000111101010000110000000001111111110  000111111010000110000000001111111110  000111111110000110000000001111111110  000101010101000110000000001111111110  000111010101000110000000001111111110  000111110101000110000000001111111110  000111111101000110000000001111111110  000010101011000110000000001111111110  000110101011000110000000001111111110  000111101011000110000000001111111110  000111111011000110000000001111111110  000101010111000110000000001111111110  000111010111000110000000001111111110  000111110111000110000000001111111110  000010101111000110000000001111111110  000110101111000110000000001111111110  000111101111000110000000001111111110  000101011111000110000000001111111110  000111011111000110000000001111111110  000010111111000110000000001111111110  000110111111000110000000001111111110  000101111111000110000000001111111110  000011111111000110000000001111111110  000111111111000110000000001010101000  000111111111000110000000001110101000  000111111111000110000000001111101000  000111111111000110000000001010100100  000111111111000110000000001110100100  000111111111000110000000001010010100  000111111111000110000000000101010100  000111111111000110000000001101010100  000111111111000110000000001011010100  000111111111000110000000001111010100  000111111111000110000000001010110100  000000000000000011110000000000000000  000000000000000111100000000000000000  000110000000011000000000000000000000  000001100000011000000000000000000000  000000011000011000000000000000000000  000000000110011000000000000000000000  000000000001111000000000000000000000  000011000000110000000000000000000000  000000110000110000000000000000000000  000000001100110000000000000000000000  000000000011110000000000000000000000  000110000001100000000000000000000000  000001100001100000000000000000000000  000000011001100000000000000000000000  000000000111100000000000000000000000  000011000011000000000000000000000000  000000110011000000000000000000000000  000000001111000000000000000000000000  000110000110000000000000000000000000  000001100110000000000000000000000000  000000011110000000000000000000000000  000011001100000000000000000000000000  000000111100000000000000000000000000  000110011000000000000000000000000000  000001111000000000000000000000000000  000011110000000000000000000000000000  000111100000000000000000000000000000  000000000000000000000000000110000010  000000000000000000000000000001100010  000000000000000000000000000000011010  000000000000000000000000000110001010  000000000000000000000000000001101010  000000000000000000000000000110101000  000000000000000000000000001100000000  000000000000000000000000000011000000  000000000000000000000000000111010000  000000000000000000000000000000110000  000000000000000000000000000110010100
                                                  表13                       在初始状态3(000111111111000110000000001111111110)中的同步字模式               错误模式             每位平方欧几里德距离  000111111111000110000000001110110100  000111111111000110000000001111110100  000111111111000110000000001010101100  000111111111000110000000001110101100  000111111111000110000000001111101100  000111111111000110000000001111111100  000111111111000110000000001010101010  000111111111000110000000001110101010  000111111111000110000000001111101010  000111111111000110000000001111111010  000111111111000110000000000101010110  000111111111000110000000001101010110  000111111111000110000000001111010110  000111111111000110000000001111110110  000111111111000110000000001010101110  000111111111000110000000001110101110  000111111111000110000000001111101110  000111111111000110000000000101011110  000111111111000110000000001101011110  000111111111000110000000001111011110  000111111111000110000000001010111110  000111111111000110000000001110111110  000111111111000110000000000101111110  000111111111000110000000001101111110  000111111111000110000000001011111110  000111111111000110000000000111111110  000111111111000110100000001111111110  000111111111000110010000001111111110  000111111111000110001000001111111110  000111111111000110101000001111111110  000111111111000110000100001111111110  000111111111000110010100001111111110  000111111111000110000010001111111110  000111111111000110001010001111111110  000111111111000110101010001111111110  000111111111000110000001001111111110  000111111111000110000101001111111110  000111111111000110010101001111111110  000111111111000110000000101111111110  000111111111000110000010101111111110  000000000000000000000000000001110100  000000000000000000000000000000001100  000000000000000000000000000110000101  000000000000000000000000000001100101  000000000000000000000000000000011101  000000000000000000000000000000000011  000000000000000000000000000110000001  000000000000000000000000000001100001  000000000000000000000000000000011001  000000000000000000000000000000000111  000000000000000000000000001100000011  000000000000000000000000000011000011  000000000000000000000000000000110011  000000000000000000000000000000001111  000000000000000000000000000110000110  000000000000000000000000000001100110  000000000000000000000000000000011110  000000000000000000000000001100001100  000000000000000000000000000011001100  000000000000000000000000000000111100  000000000000000000000000000110011000  000000000000000000000000000001111000  000000000000000000000000001100110000  000000000000000000000000000011110000  000000000000000000000000000111100000  000000000000000000000000001111000000  000000000000000000111100000000000000  000000000000000000011110000000000000  000000000000000000001111000000000000  000000000000000000110011000000000000  000000000000000000000111100000000000  000000000000000000011001100000000000  000000000000000000000011110000000000  000000000000000000001100110000000000  000000000000000000110000110000000000  000000000000000000000001111000000000  000000000000000000000110011000000000  000000000000000000011000011000000000  000000000000000000000000111100000000  000000000000000000000011001100000000
                                                  表14                      在初始状态3(000111111111000110000000001111111110)中的同步字模式                错误模式            每位平方欧几里德距离  000111111111000110001010101111111110  000111111111000110101010101111111110  000111111111000110000000011111111110  000111111111000110000001011111111110  000111111111000110000101011111111110  000111111111000110010101011111111110  000111111111000110000000001010101001  000111111111000110000000001110101001  000111111111000110000000001111101001  000111111111000110000000000101010101  000111111111000110000000001101010101  000111111111000110000000001111010101  000111111111000110000000001111110101  000111111111000110000000001010101101  000111111111000110000000001110101101  000111111111000110000000001111101101  000111111111000110000000001111111101  000111111111000110000000001111111111  100111111111000110000000001111111110  010111111111000110000000001111111110  001111111111000110000000001111111110  101111111111000110000000001111111110  000111111111100110000000001111111110  000111111111010110000000001111111110  000111111111001110000000001111111110  000111111111101110000000001111111110  000111111111000111000000001111111110  000111111111000111010000001111111110  000111111111000111010100001111111110  000111111111000111010101001111111110  000111111111000111010101011111111110  000000000000000000001100001100000000  000000000000000000110000001100000000  000000000000000000000000011110000000  000000000000000000000001100110000000  000000000000000000000110000110000000  000000000000000000011000000110000000  000000000000000000000000000110000011  000000000000000000000000000001100011  000000000000000000000000000000011011  000000000000000000000000001100000001  000000000000000000000000000011000001  000000000000000000000000000000110001  000000000000000000000000000000001101  000000000000000000000000000110000100  000000000000000000000000000001100100  000000000000000000000000000000011100  000000000000000000000000000000000010  000000000000000000000000000000000001  111100000000000000000000000000000000  011110000000000000000000000000000000  001111000000000000000000000000000000  110011000000000000000000000000000000  000000000000111100000000000000000000  000000000000011110000000000000000000  000000000000001111000000000000000000  000000000000110011000000000000000000  000000000000000001111000000000000000  000000000000000001100110000000000000  000000000000000001100001100000000000  000000000000000001100000011000000000  000000000000000001100000000110000000
已确认同步字模式及其错误模式与16/18代码之间的平方欧几里德距离 大于5，并且不在任何错误的位置重置。所以可以以通过视所有与同步字模 式的平方欧几里德距离小于4的错误模式为同步字而允许的误差检测同步 字，从而可以在错误检测概率的没有任何增加的情况下，降低无法检测的概 率。
另外，向对于同步字的前述条件1至3添加下述条件4至6：
条件4：
同步字中在9T之前和之后不应该出现1T的信号。
条件5：
在任何同步字之前和之后应该存在大于2T。因此，9T位于同步字任一 端附近。
条件6：
因为对同步字的移动敏感，所以9T不应该连续重复3次。
表15所示的一个同步字模式可以对S0和S1、以及S2和S3中每一对设 为公用。
表15   初始状态                 同步模式  错误模式  最终状态   S0，S1  111000000000110011111111100000000011     85     S0   S2，S3  110000000001110011111111100000000011     85     S0
图11展示了16/18(0，7)代码的同步字模式和格子图。
表15所示的两类同步字模式错误模式的每位平方欧几里德距离如下所 述。
即，表16至17给出了在初始状态S0和S1中的同步字模式的错误模式 的每位平方欧几里德距离。
                                               表16                   在初始状态0或1(111000000000110011111111100000000011)中的同步字模式               错误模式          每位平方欧几里德距离  111000000000110010101010100000000011  111000000000110010101011100000000011  111000000000110010101111100000000011  111000000000110010111111100000000011  111000000000110001010101000000000011  111000000000110001010101100000000011  111000000000110001010111100000000011  111000000000110001011111100000000011  111000000000110001111111100000000011  111000000000100011111111100000000011  111000000000010011111111100000000011  010000000000110011111111100000000011  110000000000110011111111100000000011  101000000000110011111111100000000011  011000000000110011111111100000000011  111000000000110011111111100000000010  111000000000110011111111100000000001  111000000000110011010101000000000011  111000000000110011110101000000000011  111000000000110011111101000000000011  111000000000110011111111000000000011  111000000000110011101010100000000011  111000000000110011111010100000000011  111000000000110011111110100000000011  111000000000110011010101100000000011  111000000000110011110101100000000011  111000000000110011111101100000000011  111000000000110011101011100000000011  111000000000110011111011100000000011  111000000000110011010111100000000011  111000000000110011110111100000000011  111000000000110011101111100000000011  111000000000110011011111100000000011  111000000000110011111111110000000011  111000000000110011111111101000000011  111000000000110011111111100100000011  111000000000110011111111110100000011  111000000000110011111111100010000011  111000000000110011111111101010000011  111000000000110011111111100001000011  111000000000110011111111100101000011  111000000000110011111111110101000011  111000000000110011111111100000100011  000000000000000001100000011000000000  000000000000000001100001100000000000  000000000000000001100110000000000000  000000000000000001111000000000000000  000000000000000011000000001100000000  000000000000000011000000110000000000  000000000000000011000011000000000000  000000000000000011001100000000000000  000000000000000011110000000000000000  000000000000011110000000000000000000  000000000000111100000000000000000000  110011000000000000000000000000000000  001111000000000000000000000000000000  011110000000000000000000000000000000  111100000000000000000000000000000000  000000000000000000000000000000000001  000000000000000000000000000000000011  000000000000000000110000001100000000  000000000000000000001100001100000000  000000000000000000000011001100000000  000000000000000000000000111100000000  000000000000000000011000011000000000  000000000000000000000110011000000000  000000000000000000000001111000000000  000000000000000000110000110000000000  000000000000000000001100110000000000  000000000000000000000011110000000000  000000000000000000011001100000000000  000000000000000000000111100000000000  000000000000000000110011000000000000  000000000000000000001111000000000000  000000000000000000011110000000000000  000000000000000000111100000000000000  000000000000000000000000011110000000  000000000000000000000000001111000000  000000000000000000000000000111100000  000000000000000000000000011001100000  000000000000000000000000000011110000  000000000000000000000000001100110000  000000000000000000000000000001111000  000000000000000000000000000110011000  000000000000000000000000011000011000  000000000000000000000000000000111100
                                              表17                   在初始状态0或1(111000000000110011111111100000000011)中的同步字模式                错误模式          每位平方欧几里德距离  111000000000110011111111100010100011  111000000000110011111111101010100011  111000000000110011111111100000010011  111000000000110011111111100001010011  111000000000110011111111100101010011  111000000000110011111111110101010011  111000000000110011111111100000001011  111000000000110011111111100000101011  111000000000110011111111100010101011  111000000000110011111111101010101011  111000000000110011111111100000000111  111000000000110011111111100000010111  111000000000110011111111100001010111  111000000000110011111111100101010111  111000000000110011111111110101010111  111100000000110011111111100000000011  111010000000110011111111100000000011  111001000000110011111111100000000011  111101000000110011111111100000000011  111000100000110011111111100000000011  111010100000110011111111100000000011  111000010000110011111111100000000011  111001010000110011111111100000000011  111101010000110011111111100000000011  111000001000110011111111100000000011  111000101000110011111111100000000011  111010101000110011111111100000000011  111000000100110011111111100000000011  111000010100110011111111100000000011  111001010100110011111111100000000011  111101010100110011111111100000000011  111000000010110011111111100000000011  111000001010110011111111100000000011  111000101010110011111111100000000011  111010101010110011111111100000000011  111000000001110011111111100000000011  111000000101110011111111100000000011  111000010101110011111111100000000011  111001010101110011111111100000000011  111101010101110011111111100000000011  111000000000111011111111100000000011  111000000000110111111111100000000011  000000000000000000000000000011001100  000000000000000000000000001100001100  000000000000000000000000000000011110  000000000000000000000000000001100110  000000000000000000000000000110000110  000000000000000000000000011000000110  000000000000000000000000000000001111  000000000000000000000000000000110011  000000000000000000000000000011000011  000000000000000000000000001100000011  000000000000000000000000000000000111  000000000000000000000000000000011001  000000000000000000000000000001100001  000000000000000000000000000110000001  000000000000000000000000011000000001  000111100000000000000000000000000000  000011110000000000000000000000000000  000001111000000000000000000000000000  000110011000000000000000000000000000  000000111100000000000000000000000000  000011001100000000000000000000000000  000000011110000000000000000000000000  000001100110000000000000000000000000  000110000110000000000000000000000000  000000001111000000000000000000000000  000000110011000000000000000000000000  000011000011000000000000000000000000  000000000111100000000000000000000000  000000011001100000000000000000000000  000001100001100000000000000000000000  000110000001100000000000000000000000  000000000011110000000000000000000000  000000001100110000000000000000000000  000000110000110000000000000000000000  000011000000110000000000000000000000  000000000001111000000000000000000000  000000000110011000000000000000000000  000000011000011000000000000000000000  000001100000011000000000000000000000  000110000000011000000000000000000000  000000000000001111000000000000000000  000000000000000111100000000000000000
同样，表18至19给出了在初始状态S2和S3中的同步字模式的错误模 式的每位平方欧几里德距离。
                                              表18                  在初始状态2或3(110000000001110011111111100000000011)中的同步字模式                错误模式         每位平方欧几里德距离  110000000001110010101010100000000011  110000000001110010101011100000000011  110000000001110010101111100000000011  110000000001110010111111100000000011  110000000001110001010101000000000011  110000000001110001010101100000000011  110000000001110001010111100000000011  110000000001110001011111100000000011  110000000001110001111111100000000011  110000000000100011111111100000000011  110000000001100011111111100000000011  110000000001010011111111100000000011  110000000000110011111111100000000011  100000000001110011111111100000000011  010000000001110011111111100000000011  110000000001110011111111100000000010  110000000001110011111111100000000001  110000000001110011010101000000000011  110000000001110011110101000000000011  110000000001110011111101000000000011  110000000001110011111111000000000011  110000000001110011101010100000000011  110000000001110011111010100000000011  110000000001110011111110100000000011  110000000001110011010101100000000011  110000000001110011110101100000000011  110000000001110011111101100000000011  110000000001110011101011100000000011  110000000001110011111011100000000011  110000000001110011010111100000000011  110000000001110011110111100000000011  110000000001110011101111100000000011  110000000001110011011111100000000011  110000000001110011111111110000000011  110000000001110011111111101000000011  110000000001110011111111100100000011  110000000001110011111111110100000011  110000000001110011111111100010000011  110000000001110011111111101010000011  110000000001110011111111100001000011  110000000001110011111111100101000011  110000000001110011111111110101000011  110000000001110011111111100000100011  000000000000000001100000011000000000  000000000000000001100001100000000000  000000000000000001100110000000000000  000000000000000001111000000000000000  000000000000000011000000001100000000  000000000000000011000000110000000000  000000000000000011000011000000000000  000000000000000011001100000000000000  000000000000000011110000000000000000  000000000001100110000000000000000000  000000000000011110000000000000000000  000000000000111100000000000000000000  000000000001111000000000000000000000  011110000000000000000000000000000000  111100000000000000000000000000000000  000000000000000000000000000000000001  000000000000000000000000000000000011  000000000000000000110000001100000000  000000000000000000001100001100000000  000000000000000000000011001100000000  000000000000000000000000111100000000  000000000000000000011000011000000000  000000000000000000000110011000000000  000000000000000000000001111000000000  000000000000000000110000110000000000  000000000000000000001100110000000000  000000000000000000000011110000000000  000000000000000000011001100000000000  000000000000000000000111100000000000  000000000000000000110011000000000000  000000000000000000001111000000000000  000000000000000000011110000000000000  000000000000000000111100000000000000  000000000000000000000000011110000000  000000000000000000000000001111000000  000000000000000000000000000111100000  000000000000000000000000011001100000  000000000000000000000000000011110000  000000000000000000000000001100110000  000000000000000000000000000001111000  000000000000000000000000000110011000  000000000000000000000000011000011000  000000000000000000000000000000111100
                                             表19                 在初始状态2或3(1100000000001110011111111100000000011)中的同步字模式               错误模式       每位平方欧几里德距离  110000000001110011111111100010100011  110000000001110011111111101010100011  110000000001110011111111100000010011  110000000001110011111111100001010011  110000000001110011111111100101010011  110000000001110011111111110101010011  110000000001110011111111100000001011  110000000001110011111111100000101011  110000000001110011111111100010101011  110000000001110011111111101010101011  110000000001110011111111100000000111  110000000001110011111111100000010111  110000000001110011111111100001010111  110000000001110011111111100101010111  110000000001110011111111110101010111  111000000001110011111111100000000011  110100000001110011111111100000000011  110010000001110011111111100000000011  111010000001110011111111100000000011  110001000001110011111111100000000011  110101000001110011111111100000000011  110000100001110011111111100000000011  110010100001110011111111100000000011  111010100001110011111111100000000011  110000010001110011111111100000000011  110001010001110011111111100000000011  110101010001110011111111100000000011  110000001001110011111111100000000011  110000101001110011111111100000000011  110010101001110011111111100000000011  111010101001110011111111100000000011  110000000101110011111111100000000011  110000010101110011111111100000000011  110001010101110011111111100000000011  110101010101110011111111100000000011  110000000011110011111111100000000011  110000001011110011111111100000000011  110000101011110011111111100000000011  110010101011110011111111100000000011  111010101011110011111111100000000011  110000000001111011111111100000000011  110000000001110111111111100000000011  000000000000000000000000000011001100  000000000000000000000000001100001100  000000000000000000000000000000011110  000000000000000000000000000001100110  000000000000000000000000000110000110  000000000000000000000000011000000110  000000000000000000000000000000001111  000000000000000000000000000000110011  000000000000000000000000000011000011  000000000000000000000000001100000011  000000000000000000000000000000000111  000000000000000000000000000000011001  000000000000000000000000000001100001  000000000000000000000000000110000001  000000000000000000000000011000000001  001111000000000000000000000000000000  000111100000000000000000000000000000  000011110000000000000000000000000000  001100110000000000000000000000000000  000001111000000000000000000000000000  000110011000000000000000000000000000  000000111100000000000000000000000000  000011001100000000000000000000000000  001100001100000000000000000000000000  000000011110000000000000000000000000  000001100110000000000000000000000000  000110000110000000000000000000000000  000000001111000000000000000000000000  000000110011000000000000000000000000  000011000011000000000000000000000000  001100000011000000000000000000000000  000000000111100000000000000000000000  000000011001100000000000000000000000  000001100001100000000000000000000000  000110000001100000000000000000000000  000000000011110000000000000000000000  000000001100110000000000000000000000  000000110000110000000000000000000000  000011000000110000000000000000000000  001100000000110000000000000000000000  000000000000001111000000000000000000  000000000000000111100000000000000000
工业实用性
如前所述，本发明使得可以从代码序列中区分块同步信号，并在数据读 取或接收时识别由多个代码字组成的块的首部，其中使用块同步信号添加到 该块的首部，并且其中当代码序列中连续相同位的最大长度设为Tmax＝8时， 连续重复9个相同的位多于一次。
同样，本发明使得可以以任何通过认为同步字模式之间平方欧几里德距 离小于4所有错误模式是同步字而允许的误差，来检测同步字，并在错误检 测概率的没有任何增加的情况下，降低无法检测的概率。
同样，本发明使得可以在具有随时间改变的结构并用于对包括来自传输 信道的输出序列的块同步信号的代码序列的最大似然性检测的检测格子中， 通过视起点状态彼此不同的块同步信号分别为唯一，并在终点彼此相同，而 降低块同步信号的错误检测的概率，并使用具有检测窗的窗信号，即基于检 测到的同步信号，检测块同步信号。
同样，本发明使得可以在具有随时间改变的结构并用于对包括来自传输 信道的输出序列的块同步信号的代码序列的最大似然性检测的检测格子中， 通过视起点状态彼此不同的块同步信号分别为唯一，并在终点彼此相同，而 进行稳定的尺度检测，并根据块同步信号的唯一性，使用块同步信号，在检 测格子中检测块同步信号和TCPR维特比检测器的起点状态，并在检测块同 步信号之后重置分支尺度(branch metric)。