Double comb filter
阅读：132发布：2022-03-03
专利汇可以提供Double comb filter专利检索，专利查询，专利分析的服务。并且A first comb filter is employed to eliminate the chrominance subcarrier from a composite video signal containing chrominance information. The resultant signal contains certain undesired signals. These are cancelled by using a second comb filter to comb out the chrominance subcarrier from the signal from the delay line of the first comb filter leaving the undesired signals which are then added to the output signal of the first comb filter. The undesired signals cancel because they are in phase opposition.，下面是Double comb filter专利的具体信息内容。
1. Apparatus for processing a signal of a type that contains first and second components, said first components occurring at intervals, said second components also occurring at intervals and being interleaved between said first components, said second components also alternating in phase at predetermined intervals; said apparatus comprising a first comb filter having an input terminal to which said signal is applied, a first signal adding network and a first delay network, said first signal adding network having first and second input terminals and an output terminal, said first delay network having an input terminal and an output terminal and a time delay equal to said predetermined interval, means connecting said input terminal of said first comb filter to said first input terminal of said first signal adding network and to said input terminal of said first delay network for supplying said signal thereto, means connecting said output terminal of said first delay network to said second input terminal of said first signal adding network for adding the delayed output signal of said first delay network to said signal supplied to said first input terminal of said first signal adding network to provide an output signal at said output terminal from which said second components have been cancelled, said output signal including an unwanted signal component generated in said first delay network; a second comb filter having an input terminal, a second signal adding network and a second delay network, said second signal adding network having first and second input terminals and an output terminal, said second delay network having an input terminal and an output terminal and a time delay equal to said predetermined interval; means connecting said output terminal of said first delay network to said input terminal of said second comb filter for supplying said delayed output signal of said first delay network thereto, said delayed output signal including said unwanted signal component; said second comb filter also including means connecting said input terminal thereof to said first input terminal of said second signal adding network and to said input terminal of said second delay network for supplying said delayed output signal thereto and means connecting said output terminal of said second delay network to said second input terminal of said second signal adding network for adding the delayed output signal of said second delay network to said signal supplied to said first input terminal of said second signal adding network to provide an output signal at said output terminal of said second signal adding network from which said second components have been cancelled but which contains said unwanted signal component; a third signal adding network having first and second input terminals and an output terminal; and means connecting said output terminals of said first and second signal adding networks to said first and second input terminals respectively of said third signal adding network for supplying said output signals at said output terminals of said first and second signal adding networks respectively with said unwanted signals in phase opposition to said first and second input terminals respectively of said third signal adding network to add the signal at a said second input terminal of said third signal adding network to the signal at said first input terminal thereof to provide an output signal at said output terminal of said third signal adding network from which both said second components and said unwanted component have been cancelled.
2. Apparatus according to claim 1 wherein said means connecting said output terminals of said first and second signal adding networks to said first and second input terminals respectively of said third signal adding network includes phase inverting means connected between one of said output terminals of said first or second signal adding networks and the input terminal of said third signal adding network to which said one output terminal is connected.
3. Apparatus according to claim 2 wherein said means connecting said input terminal of said first comb filter and said input terminals of said first signal adding network and said first delay network includes a buffer amplifier, said means connecting said output terminal of said first delay network and said second input terminal of said first signal adding network includes a buffer amplifier, said means connecting said input terminal of said second comb filter and said input terminals of said second signal adding network and said second delay network includes a buffer amplifier and said means connecting said output terminal of said second delay network and said secOnd input terminal of said second signal adding network includes a buffer amplifier.
4. Apparatus according to claim 1 wherein said means connecting said input terminal of said first comb filter and said input terminals of said first signal adding network and said first delay network includes a buffer amplifier, said means connecting said output terminal of said first delay network and said second input terminal of said first signal adding network includes a buffer amplifier, said means connecting said input terminal of said second comb filter and said input terminals of said second signal adding network and said second delay network includes a buffer amplifier and said means connecting said output terminal of said second delay network and said second input terminal of said second signal adding network includes a buffer amplifier.
5. Apparatus according to claim 4 including a buffer amplifier having an input terminal connected to said output terminal of said third signal adding network.
6. Apparatus according to claim 5 wherein said buffer amplifiers are emitter follower amplifiers.
7. Apparatus according to claim 1 wherein said signal adding networks are resistive matrices.
8. Apparatus according to claim 1 wherein said means connecting said output terminals of said first and second signal adding networks to said first and second input terminals respectively of said third signal adding network includes means for amplifying at least one of said output signals of said first and second signal adding networks to a level such that said unwanted components in the signals applied to said input terminals of said third signal adding network are of equal amplitude.
9. Apparatus according to claim 8 wherein said means connecting said output terminals of said first and second signal adding networks to said first and second input terminals respectively of said third signal adding network includes phase inverting means connected between one of said output terminals of said first or second signal adding networks and the input terminal of said third signal adding network to which said one output terminal is connected.
10. Apparatus according to claim 9 wherein said means connecting said input terminal of said first comb filter and said input terminals of said first signal adding network and said first delay network includes a buffer amplifier, said means connecting said output terminal of said first delay network and said second input terminal of said first signal adding network includes a buffer amplifier, said means connecting said input terminal of said second comb filter and said input terminals of said second signal adding network and said second delay network includes a buffer amplifier and said means connecting said output terminal of said second delay network and said second input terminal of said second signal adding network includes a buffer amplifier.
11. Apparatus according to claim 10 wherein said signal adding networks are resistive matrices.
12. In a television receiver, apparatus of the type claimed in claim 1, said signal being a composite NTSC video signal, said first component being the luminance component thereof, said second component being the chrominance component thereof and said predetermined interval being the time for scanning of one complete line.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 超声成像压缩方法及设备 | 2020-05-11 | 514 |
| DC电弧检测和光伏电站分析系统 | 2020-05-11 | 618 |
| NxN波长路由网络拓扑、光子集成芯片及光路由器 | 2020-05-12 | 166 |
| 一种频谱扫描测量装置及时域波形获取方法 | 2020-05-12 | 349 |
| 一种低复杂度的动态非均匀信道化用户分离方法 | 2020-05-13 | 161 |
| 一种用于视频会议系统的语音活动检测系统 | 2020-05-14 | 543 |
| 多工器、高频前端电路以及通信装置 | 2020-05-08 | 981 |
| 一种用于五路合路器的合路结构 | 2020-05-08 | 854 |
| 一种L波段超低相位噪声多点捷变频频率源系统 | 2020-05-12 | 634 |
| 一种多次重复移相的码移键控调制方法及其解调方法 | 2020-05-11 | 427 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
梳状滤波器热门专利
-
7 弹性波滤波器
QQ群二维码
意见反馈
意见反馈