Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-12-27
1981-07-14
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455184, 455186, 455194, 3581921, H04B 116, H04N 550
Patent
active
042790352
ABSTRACT:
A keyboard-operated, microcomputer-controlled method and apparatus for selecting a channel in a television receiver. Following selection of the desired channel, appropriate tuning data is stored in memory with the channel number display updated to present the selected channel until a second entry is made whereupon the selected channel tuning data is read from memory and transmitted to tuning circuitry. If a second entry is not made within a predetermined time interval from channel number entry, the system remains tuned to the previously selected channel with the channel number display reverting to the previously selected channel number. If an illegal channel number is selected, the system remains tuned to the previously selected valid channel number which is once again displayed when the second entry is made or after a predetermined time interval from channel number entry if no second entry is made.
REFERENCES:
patent: 3931579 (1976-01-01), Ma et al.
patent: 3962644 (1976-06-01), Baker
patent: 3973228 (1976-08-01), Mueller et al.
patent: 3980958 (1976-09-01), Tanaka
patent: 4093922 (1978-06-01), Buss
patent: 4151559 (1979-04-01), Merrell
patent: 4162513 (1979-07-01), Beyers, Jr. et al.
"A Microcomputer Controlled Frequency Synthesizer for TV" by Rzeszewski et al., 2/1978.
"A Low Cost Varactor Tuning System for TV" by Borg, IEEE Transaction on Consumer Electronics, vol. CE-24, No. 1, 2/78.
"A Systems Approach to Low Cost Electronic Tuning Address" by Howell et al. IEEE Transaction on Consumer Electronics, vol. CE-24, No. 3, 8/78.
"Farbfernsehgerat mit Mikroprozessor-Steurung" by Baum, 8/12/1977, Funkschau, HEFT 17.
Hill Thomas E.
Ng Jin F.
Zenith Radio Corporation
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