Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-06-09
1982-02-23
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455168, 455188, H04B 116, H03J 500
Patent
active
043172270
ABSTRACT:
An all-electronic, integrated television channel tuning indirect frequency synthesis system capable of operating over the VHF, UHF and CATV spectra in which digital bandswitching is accomplished automatically. Keyboard selected control inputs are provided to a microcomputer for the generation of digital bandswitching signals and, in combination with a phase locked loop, tuning voltages. The bandswitch signals and tuning voltages are provided to a tuner having several resonant frequency circuits, each including a varactor diode and a plurality of coupled inductors and switching diodes.
REFERENCES:
patent: 3942122 (1976-03-01), Nakanishi
patent: 4002986 (1977-01-01), Ma
patent: 4015192 (1977-03-01), Koyanagi
patent: 4118679 (1978-10-01), Hiday
patent: 4160213 (1979-07-01), Carter
patent: 4161708 (1979-07-01), Friberg
patent: 4249132 (1981-02-01), Griepentrog
patent: 4271529 (1981-06-01), Strammello, Jr.
patent: 4279035 (1981-07-01), Skerlos
A Microcomputer Controlled Frequency Synthesizer for TV, by Rzeszewski, IEEE Transactions on Consumer Electronics, vol. CE.-24, No. 2, May 1978, pp. 145-152.
Chin Tommy P.
Zenith Radio Corporation
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