System for the transmission of analog signals by means of pulse code modulation using non-recursive filters
阅读：880发布：2021-09-03
专利汇可以提供System for the transmission of analog signals by means of pulse code modulation using non-recursive filters专利检索，专利查询，专利分析的服务。并且A pulse code modulation system utilizes one digital filter before the digital compressor in the transmitter and a digital device which includes digital filters after the digital expander in the receiver, thereby eliminating the necessity for input and output analog filters in the transmitter and receiver, respectively.，下面是System for the transmission of analog signals by means of pulse code modulation using non-recursive filters专利的具体信息内容。
1. A system for the transmission of analog signals by means of a pulse code modulation, comprising a transmitter and a receiver, said transmitter comprising means to sample said analog signal at four times the maximum information frequency to be transmitted of said analog signal, a coder coupled to said sampling means to convert linearly said sampled signals to code groups comprising serial bits, a digital filter coupled to said coder, said digital filter being formed as a low pass, half band filter of the nonrecursive type, and a digital compressor coupled to said digital filter, said receiver comprising a digital expander having an output which is similar to the input to said digital compressor, a digital filtering device for interpolating between code groups at the input means thereof to produce output code groups at at least four times the frequency of the input code groups thereof, said digital filtering device comprising a plurality of nonrecursive filters, and a decoder being coupled to said digital filtering device for generating an output signal which is a reproduction of said analog signal.
2. A transmitter for the transmission of analog signals by means of a pulse code modulation, comprising means to sample said analog signal at least four times the maximum information frequency of said analog signal, a coder coupled to said sampling means to convert linearly said sampled signals to code groups comprising serial bits, a digital filter coupled to said coder being formed as a low pass, half band filter of the non-recursive type, and a digital compressor coupled to said digital filter.
3. A transmitter as claimed in claim 2, wherein said coder comprises a four-slope coder in which said sampled signal is applied to a duration modulator comprising two integrating networks having greatly differing time constants for pulse duration in accordance with four difference slopes, the three slopes of which commences at a fixed instant during each conversion period, means to derive 12-bit code groups coupled to said integrating networks, said duration modulator comprising two digital counters coupled to said integrating networks respectively, said digital counters being active one after the other during a half a conversion period and are thereafter converted into a shift register in order to supply the bits of a code group stored therein in parallel as a serial bit output signal.
4. A transmitter as claimed in claim 3, wherein the zero point of said conversion is located in the center of its linear region, said region corresponding to 64 times the bit of the smallest weight.
5. A transmitter as claimed in claim 2, wherein said digital filter comprises means to separate code groups into code groups of even order and code groups of odd order, a multiplier in which the code groups of even order are multiplied by a predetermined weight co-efficient the magnitude of which is determined from the central transfer co-efficient of said digital filter, a plurality of multipliers in which code groups of odd order are multiplied by predetermined weight co-efficients whose magnitudes are determined from the odd transfer co-efficients of said digital filter, and a cascade cIrcuit of dynamic memories and combination devices for combining the output signals of said multipliers in a predetermined manner.
6. A receiver for a pulse code modulated signal comprising an analog signal encoded as compressed digitally code groups, said receiver comprising a digital expander, a digital filter device for interpolating between code groups at the input means thereof to produce output code groups at least four times the frequency of the input code groups thereof, said digital filtering device comprising non-recursive filters and a decoder, said decoder being coupled to said digital device for generating an output signal which is a reproduction of said analog signal.
7. A receiver as claimed in claim 6, further comprising means to convert the pulse code modulation signal from said digital filtering device into delta pulse code modulation by subtracting successive code groups from each other, said conversion means being between said digital filtering device and said decoder.
8. A receiver as claimed in claim 7, wherein said digital filtering device comprises a cascade circuit of two devices each of said devices comprising a non-recursive digital filter, a delay circuit connected to the input means of said digital filter and an OR-gate connected to the output means of said digital filter, the output means of said delay circuit being connected to said OR-gate whereby code groups present at the output means of said digital filter and code groups present at the output means of said delay circuit alternate with each other.
9. A receiver as claimed in claim 8, wherein said non-recursive digital filter comprises a plurality of multipliers in which code groups at the filter input are multiplied by predetermined weight co-efficients whose magnitudes are determined from the odd transfer co-efficients of said digital filter, and a cascade circuit of dynamic memories and combination device for combining the output signal of said multipliers in a predetermined manner.
10. A receiver as claimed in claim 7, wherein said decoder comprises a device which converts 12-bits code groups applied to the input into two independent density-modulation pulse trains, namely one pulse train for six bits of small weight and one integrator employing two time constants which are fed in the same time by the two said pulse trains and the output of which supplied the original analog signal.
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