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EP0308241A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Multiplex signal processing apparatus

Assignee: Panasonic Holdings Corp
•
Filing: 1988-09-16
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Granted: —
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Expires: 2008-09-16
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Abstract

Abstract In a multiplex signal processing apparatus, in the band of a demodulated signal in which a carrier is amplitude-­modulated in a vestigial side band by a main signal, another carrier which is identical in frequency with the first car­rier but different in phase by 90° is amplitude-modulated in double side bands by a multiplex signal different from the main signal and formed into a vestigial side band signal by a nyquist filter is superposed. At least either the fre­quency or polarity of the multiplex signal is inverted on the transmission side by a multiplier, an oscillator and a filter. At least either the frequency or polarity of the multiplex signal is inverted on the reception side by a multiplier, an oscillator and a filter. The reception side has a crosstalk reduction filter for removing a crosstalk from the main signal to the multiplex signal.

Inventors

  • 👤 Shuji Inoue
  • 👤 Yoshio Yasumoto
  • 👤 Sadashi Kageyama
  • 👤 Hideyo Uwabata
  • 👤 Yoshio Abe

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-25 06:29
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/06; H04N7/0803

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 55 words
A multiplex signal processing apparatus on a transmission side, comprising: means for modulating a first carrier by a main signal, means for inverting at least either frequency or polarity of a multiplex signal; and means for modulating a second carrier having a different phase from the first carrier by an output of said inverting means.
Claim 2
Dependent Claim 55 words
A multiplex signal processing apparatus on a transmission side, comprising: means for modulating a first carrier by a main signal, means for inverting at least either frequency or polarity of a multiplex signal; and means for modulating a second carrier having a different phase from the first carrier by an output of said inverting means.
Claim 3
Dependent Claim 37 words
A multiplex signal processing apparatus as set forth in Claim 1, further comprising an inverse nyquist filter having nyquist characteristics for filtering the output from the second carrier modulating means to form a vestigial side band signal.
Claim 4
Dependent Claim 134 words
A multiplex signal processing apparatus on a re­ception side, comprising: first synchronous detection means for receiving a signal formed by modulating a first carrier by a main sig­nal, and a signal composed of a signal formed by modulating a second carrier having a different phase from that of the first carrier by a signal inverted of at least either its frequency or polarity of a multiplex signal, and synchro­nously detecting in-phase components of the first carrier to obtain the main signal; second synchronous detection means for obtaining the multiplex signal by synchronously detecting in-phase components of the second carrier; a filter for removing a crosstalk from the main signal from the output of said second synchronous detection means; and means for inverting at least either frequency or polarity of an output from said filter.
Claim 5
Dependent Claim 134 words
A multiplex signal processing apparatus on a re­ception side, comprising: first synchronous detection means for receiving a signal formed by modulating a first carrier by a main sig­nal, and a signal composed of a signal formed by modulating a second carrier having a different phase from that of the first carrier by a signal inverted of at least either its frequency or polarity of a multiplex signal, and synchro­nously detecting in-phase components of the first carrier to obtain the main signal; second synchronous detection means for obtaining the multiplex signal by synchronously detecting in-phase components of the second carrier; a filter for removing a crosstalk from the main signal from the output of said second synchronous detection means; and means for inverting at least either frequency or polarity of an output from said filter.

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