Tuners – Tuner unit with electromagnetic operator – Predetermined center frequency selector
Patent
1976-03-17
1977-04-26
Griffin, Robert L.
Tuners
Tuner unit with electromagnetic operator
Predetermined center frequency selector
325453, 334 15, H04B 116
Patent
active
040204200
ABSTRACT:
The invention discloses an electronic channel selector which comprises a plurality of variable resistors, a plurality of switches connected to the variable resistors, respectively, and a voltage memory circuit. When one of the switches is closed, the output voltage of the variable resistor corresponding to the closed switch is transferred into and stored in the voltage memory circuit, and in response to the output voltage from the memory circuit the capacitance of a varactor may be varied for selecting a desired channel. The electronic channel selector in accordance with the present invention may be used instead of the conventional mechanical tuners, the channel selection may be much facilitated, the defects encountered in the conventional electronic channel selectors may be overcome, and any desired channel may be stored.
REFERENCES:
patent: 3753172 (1973-08-01), Sakamoto
patent: 3777290 (1973-12-01), Pittman et al.
patent: 3824474 (1974-07-01), Sakamoto
Bookbinder Marc E.
Griffin Robert L.
Matsushita Electric - Industrial Co., Ltd.
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