Signal receiver for terrestrial and satellite broadcastings

Details Signal receiver for terrestrial and satellite broadcastings Signal receiver for terrestrial and satellite broadcastings

1988-01-20

1990-07-03

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455180, 455142, 455197, 3581911, H04B 116

Patent

active

049397893

ABSTRACT:
A signal receiver which is capable of receiving and demodulating a satellite broadcasting signal which is an FM signal and a terrestrial broadcasting signal which is an AM signal is disclosed. FM and AM signals are frequency-converted into signals having frequencies in a same intermediate frequency band by making common use of a radio frequency amplifier, a mixer, a local oscillator and an intermediate frequency filter. At the time of reception of an FM signal, the FM signal is demodulated in a phase-locked loop circuit, and a local oscillator is subjected to frequency modulation by a part of the demodulated signal, thereby constituting an FM negative feedback loop, and thus narrowing the occupied bandwidth of the FM signal. At the time of reception of an AM signal, the phase-locked loop circuit is used to regenerate a carrier, and the output signal of the phase-locked loop circuit is input to a multiplier to effect synchronous detection of the input signal. At this time, the FM negative feedback to the local oscillator is utilized to effect automatic frequency control, thereby achieving stabilization of the synchronous detection.

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patent: 4691356 (1987-09-01), Ichikawa
Specifications for Sprucer II, 444 MHZ convertor; Kanematsu-Gosho (USA) Inc.
Service Manual for Video Switcher TZ-SW200P, Panasonic.
"Advanced Threshold-Extension Tracking Filter for Satellite Video Reception", W. M. Rogers; IEEE National Telecommunications Conference, New Orleans, Louisiana, Nov. 29-Dec. 3, 1981, vol. 3, pp. E6.5.1-E6.5.7.
"SHF Direct Satellite Broadcasting Receiver", Y. Shiomi et al., National Technical Report, vol. 30, No. 1, Feb. 1984, pp. 4-12.
"Toshiba Television with Built-In BS Tuner 21V230", Television Technics & Electronics, vol. 32, No. 9, Sept. 1984, pp. 30-35.
Television Picture Engineering Handbook, vol. 10, Chapter 1, pp. 963-965, 1980, by the Institute of Television Engineers of Japan.

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