Tuners – Tuner unit directly responsive to voltage and/or current... – Reactance tuning
Patent
1975-07-10
1976-10-12
Gensler, Paul L.
Tuners
Tuner unit directly responsive to voltage and/or current...
Reactance tuning
307320, 325464, 325469, 334 16, H03J 318
Patent
active
039861546
ABSTRACT:
An automatic tuning apparatus comprising a tuner having a tank circuit employing a voltage controlled variable capacitance diode as a circuit element, which diode is supplied in the reverse direction with a scanning control voltage from a solid state potential memory device, which control voltage is varied under the control of a scanning voltage control circuit to scan the frequencies in the frequency band by the tuner and is set by a scan stop signal obtained from the tuner as a result of tuning of the tuner to a certain frequency, and a pair of manual switches for upward and downward scanning, a first flip-flop to be reset by the closing of either manual switch and to be set by the scan stop signal, a second flip-flop to be set and reset by the closing of the downward and upward scanning switches, respectively, a third flip-flop to be set and reset by the closing of both manual switches and caused to be reversed in the storing state thereof when the scanning voltage reaches the maximum or minimum value thereof, the said scanning voltage control circuit being controlled by the logical combination of the storing state of these flip-flops such that the frequency is scanned gradually in the direction as selected by the manual switch but rapidly in the direction not selected by the switch.
REFERENCES:
patent: 3651411 (1972-03-01), Zlotnick
patent: 3688199 (1972-08-01), Saeki et al.
patent: 3893049 (1975-07-01), Bray
Sakauchi Yoshiaki
Tsukamoto Kazuyoshi
Ushijima Kazufumi
Yamada Yasuhiro
Gensler Paul L.
Sanyo Electric Co,. Ltd.
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