Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-03-06
1981-04-28
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455150, 455179, 334 15, H04B 134
Patent
active
042649765
ABSTRACT:
A tuning control apparatus for a digital automatic scanning tuner or a digital preset tuner employing a voltage controlled variable capacitance diode as a tuning element, wherein a tuning state detecting circuit is provided for detecting a tuning state responsive to a first signal which assumes the high level when the actual tuning frequency of the tuner falls in a predetermined frequency range which is higher than the correct tuning frequency being received and a second signal which assumes the high level when the actual tuning frequency of the tuner falls in a predetermined frequency range which is lower than the correct tuning frequency being received, and when the tuner is to be tuned to the frequency of a given broadcasting signal a tuning voltage being applied to the voltage controlled variable capacitance diode is varied in the upward or the downward direction, whereby the lower end of the second signal or the upper end of the first signal is detected, whereupon the lower end of the first signal or the upper end of the second signal is detected, when the tuning voltage is changed in the reversed direction, whereupon the upper end of the second signal or the lower end of the first signal is detected, just when the tuning voltage is determined as achieving a tuning operation by the tuner to the correct tuning frequency.
REFERENCES:
patent: 3968440 (1976-07-01), Ehni
patent: 4053838 (1977-10-01), Amaya
patent: 4079420 (1978-03-01), Mogi et al.
patent: 4085371 (1978-04-01), Mogi et al.
patent: 4085372 (1978-04-01), Mogi et al.
Low-Cost Digital Tuning System with Full-Function Automatic Search Preset, T. Fjukmura, et al., IEEE Transactions on Consumer Electronics, vol. CE-24, No. 4, Nov. 1978.
Chin Tommy P.
Griffin Robert L.
Sanyo Electric Co,. Ltd.
Tokyo Sanyo Electric Co. Ltd.
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