Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-11-30
1983-08-09
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455180, H04B 126, H03J 728
Patent
active
043983030
ABSTRACT:
A signal-seeking tuning system for a television receiver scans the VHF and UHF signal bands until a present TV channel signal is detected. Tuning voltage is developed by a digital-to-analog converter in response to a binary word stored in an up/down counter. The value of the binary word increases when a scan-up signal is applied and decreases when a scan-down signal is applied. Band signals are automatically sequenced to the next higher frequency band when the binary word "rolls-over" from a maximum to a minimum value, or to the next lower frequency band when the binary word rolls-over from its minimum to its maximum value. Scanning is stopped by inhibiting changing of the binary word when a valid sequence of AFT signals is detected.
Thereafter, the tuning voltage is compensated for drifts by incrementing or decrementing the binary word whenever the AFT signal departs from a predetermined condition. This correction is inhibited, however, when the binary word is at its minimum or maximum value so that unwanted bandswitching is avoided.
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Caironi, Giancarlo, "EPM: A New Tuning System Based on a Single Chip Including Non-volatile Memory", IEEE Transactions on Consumer Electronics, vol. CE-25, Aug. 1979, pp. 606-620.
Sony KV-4000 Schematic Diagram.
Chin Danny
Henderson John G. N.
Maturo Robert J.
Berard, Jr. C. A.
Bookbinder Marc E.
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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