发明授权
US4019140A Methods and apparatus for reducing intelligible crosstalk in single
sideband radio systems
失效
用于减少单边带无线电系统中的可理解串扰的方法和装置
- 专利标题： Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems
- 专利标题（中）： 用于减少单边带无线电系统中的可理解串扰的方法和装置
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申请号： US625491申请日： 1975-10-24
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公开(公告)号： US4019140A公开(公告)日： 1977-04-19
- 发明人: Richard Barry Swerdlow
- 申请人： Richard Barry Swerdlow
- 申请人地址： NJ Murray Hill
- 专利权人： Bell Telephone Laboratories, Incorporated
- 当前专利权人： Bell Telephone Laboratories, Incorporated
- 当前专利权人地址： NJ Murray Hill
- 主分类号： H03M5/08
- IPC分类号： H03M5/08 ; H03C5/00 ; H04B1/68 ; H04B14/00 ; H04L25/08 ; H03B23/00 ; H04B1/62
摘要：
Intelligible crosstalk in microwave radio systems employing single-sideband modulation is substantially eliminated by phase-modulating the AM carrier-wave prior to its modulation by the baseband signal. The phase-modulation may comprise a periodic signal, such as a single sinusoidal tone or pseudo-random noise, or it may comprise an aperiodic signal such as a truly random noise. In this latter event, the coding signal is transmitted to the receiving location to ensure proper demodulation of the encoded signal.
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