Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-01-18
1980-09-02
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455186, H04B 126
Patent
active
042209226
ABSTRACT:
A preset tuner adapted for selecting a desired one out of a plurality of preset channels, comprising: a memory for storing digital data concerning a plurality of channels to be preset, push-buttons for addressing the memory for reading the digital data of a desired channel, a digital/analog converter for converting the read digital data into an analog signal, a manually operable variable voltage generator, a write-in/channel select mode selector, a switch circuit responsive to the mode selector switchable between the digital/analog converter and the variable voltage generator, a voltage controlled oscillator responsive to the output of the switch circuit, a tuner employing the voltage controlled oscillator as a local oscillator, a comparator for comparing the outputs of the digital/analog converter and the variable voltage generator, a counter to be reset responsive to the push-button and to be enabled responsive to the write-in mode output of the mode selector to make a counting operation as a function of the output of the comparator, the output of the counter being loaded as the digital data concerning a channel in the memory, as addressed, a reference oscillator, a frequency comparator for comparing the output of the reference oscillator and the intermediate frequency output of the tuner, a filter for filtering the frequency comparator output to provide a correction control signal to the digital/analog converter, the digital/analog converter being adapted to be corrected for deviation of the intermediate frequency of the tuner as a function of the correction control signal.
REFERENCES:
patent: 2771546 (1956-11-01), Schock
patent: 3906351 (1975-09-01), Evans
patent: 3936753 (1976-02-01), Clark
patent: 3968440 (1976-07-01), Ehni
patent: 4023116 (1977-05-01), Alfke et al.
patent: 4085371 (1978-04-01), Mogi et al.
patent: 4123718 (1978-10-01), Wine
Digital TV Tuner Uses MOS LSI and Non-Volatile Memory-Lester Penner, General Instrument Corp., Apr. 1, 1976, pp. 86-90.
Bookbinder Marc E.
Sanyo Electric Co,. Ltd.
Tokyo Sanyo Electric Co. Ltd.
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