Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-11-30
1984-01-31
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
3581931, 3581951, 455192, H04B 126, H03J 722, H03J 728
Patent
active
044294158
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. 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 RF carrier signal is lost so that the desired tuning is not also lost, whereby the selected channel is still tuned when the RF carrier signal reappears.
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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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