Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1990-12-31
1992-11-10
Kuntz, Curtis
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551921, H04B 116
Patent
active
051631644
ABSTRACT:
A tuning system of a television receiver includes a digital automatic fine tuning (AFT) unit for generating a digital AFT signal representing the deviation of the frequency of the picture carrier of the IF signal from a nominal frequency value. The digital AFT unit includes a counter for counting cycles of picture carrier during counting intervals. A portion of the IF section, the counter and at least of a portion of the signal processing section of the television receiver are included within a single integrated circuit. A microprocessor is coupled to the integrated circuit through a serial data bus. Under software program control, the microprocessor (1) transmits function control and counting control information to the signal processing section through the serial data bus, (2) receives count information from the counter through the serial data bus, and (3) evaluates count information to determine the deviation of the frequency of the IF picture carrier from its nominal frequency value.
REFERENCES:
patent: 4031549 (1977-06-01), Rast et al.
patent: 4485404 (1984-11-01), Tults
patent: 4727591 (1988-02-01), Manlove
patent: 4868892 (1989-09-01), Tults et al.
"Digit 2000 VLSI Digital TV System" published by the Intermetal Division of Deutsche ITT Industries, GmbH, Freiburg, Germany in 1983.
"Technical Publication 110-I.sup.2 C Bus in Consumer Applications" published by Philips Export B.V., The Netherlands in 1983.
Emanuel Peter M.
Kuntz Curtis
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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