Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Patent
1997-05-20
2000-06-27
Vu, Huy D.
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via frequency channels
348736, 455205, 455303, H04J 100, H04N 544, H04N 560, H04B 110
Patent
active
06081537&
ABSTRACT:
A signal trap device and method for trapping a desired FM signal out of a frequency multiplexed signal where a plurality of FM signals are included in a frequency multiplexed form. A replay signal reproduced from a video cassette tape is supplied directly to a subtracter while being fed to a fixed delay circuit and a variable delay circuit to be delayed therein by a predetermined delay time. The delayed signal is supplied also to the subtracter, which then subtracts the delayed signal from the reproduced replay signal and outputs the result of such subtraction therefrom. The delay time of the fixed delay circuit is set to correspond to the center frequency of the carrier of the desired FM signal to be trapped. Meanwhile the delay time of the variable delay circuit is so set as to correspond to the signal obtained by demodulating the desired FM signal. Thus, the desired FM signal can be trapped properly without any harmful influence on the other FM signal.
REFERENCES:
patent: 4862252 (1989-08-01), Kuroda
patent: 4943849 (1990-07-01), Faroudja et al.
Kaneko Masayasu
Mikami Tsutomu
Frommer William S.
Harper Kevin C.
Sony Corporation
Vu Huy D.
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