Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1985-06-11
1986-12-16
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
H03D 300
Patent
active
046299947
ABSTRACT:
An FM signal demodulator has a phase shifter including transversal filters for producing from a FM video signal two FM video signals which are different in phase by 90.degree. from each other, and a demodulator for detecting phase information of the FM video signal, wherein the carrier frequency is at least quadrupled prior to demodulation so as to suppress components of the FM video signal not to be included in the demodulated video signal.
REFERENCES:
patent: 3971998 (1976-07-01), Gopinath et al.
patent: 4412340 (1983-10-01), Bartlett et al.
A. Chowaniec and G. S. Hobson, "The Use of Charge-Coupled Devices for Single-Sideband Modulation", 1974, pp. 237-244, Int. Conf. on Tech. and Appl. of Charge-Coupled Devices.
Kobayashi Masa-aki
Shimotashiro Masafumi
LaRoche Eugene R.
Matsushita Electric - Industrial Co., Ltd.
Mis D. C.
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