Electronic tuning system with digital band selection

Details Electronic tuning system with digital band selection Electronic tuning system with digital band selection

1978-02-01

1979-07-17

Smith, Alfred E.

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

325459, 325464, H03H 512, H04B 106

Patent

active

041617088

ABSTRACT:
The electronic tuning system includes a station selector, a memory, control circuitry, a display and a tuner having the reception band thereof divided into three segments. The tuner incorporates several resonant frequency circuits, each comprising a signal control varactor and a plurality of series connected inductors. Band switching circuitry is provided to simultaneously operatively delete selected inductors from each of the resonant circuits, in accordance with signals generated in a band segment selection circuit. Station selection signals are generated in accordance with the actuation of the signal selector and a display driver circuit is provided to generate a station frequency code to drive the display. The digital band segment selection circuitry generates band segment selection signals in accordance with the station frequency code. The band segment selection circuitry comprises a line decoder, which converts the station frequency code to a decimal number; a plurality of shift registers and bistable circuits which latch the decimal number being multiplexed; and a logic circuit which decodes the decimal number to provide the band segment selection signals to the band switching means.

REFERENCES:
patent: 3646450 (1972-02-01), Ma
patent: 3715671 (1973-02-01), Worcester
patent: 3942121 (1976-03-01), Bell et al.
patent: 3942122 (1976-03-01), Nakanishi
patent: 4075567 (1978-02-01), Klank et al.

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