Multiplex communications – Wide area network – Packet switching
Patent
1988-09-19
1990-03-06
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375 42, 455 60, H04J 900, H04J 1100
Patent
active
049072188
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 is superposed which is identical in frequency to the first carrier but different in phase by 90.degree. is amplitude-modulated its double side bands by a multiplex signal which is different from the main signal and which is formed into a vestigial side band signal by a nyquist filter. 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 crosstalk from the main signal to the multiplex signal.
REFERENCES:
patent: 2787660 (1957-04-01), Teer
patent: 2795643 (1957-06-01), Lockhart
patent: 3924060 (1975-12-01), Bedford
patent: 4051532 (1977-09-01), Hilbert et al.
patent: 4287528 (1981-09-01), Levy
patent: 4384364 (1983-05-01), Henning
Y. Yasumoto et al., "An Extended Definition Television System Using Quadrature Modulation of the Video Carrier with Inverse Nyquist Filter", IEEE Trans. Consumer Electronics, vol. CE-33, pp. 173-180, Aug. 1987.
Pritchard, "US Color Television Fundamentals--a Review", IEEE Trans. Consumer Electron., vol. CE-23, pp. 467-478, No. 1977.
Abe Yoshio
Inoue Shuji
Kageyama Sadashi
Uwabata Hideyo
Yasumoto Yoshio
Jung Min
Matsushita Electric - Industrial Co., Ltd.
Olms Douglas W.
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