Automatic tuning system

Details Automatic tuning system Automatic tuning system

1975-08-04

1976-10-26

Richardson, Robert L.

325464, H04B 132

Patent

active

039886816

ABSTRACT:
The tuning circuit of a heterodyne oscillator is controlled by a sweep device to sweep the oscillator frequency over a range in which predetermined frequency values are associated with predetermined broadcast receiver channels. The oscillator signal is applied to a multiresonance filter which generates an output signal when the oscillator frequency corresponds with a broadcast channel frequency. The output signal frequency is counted by a counter and compared with a number stored in an input device which identifies a particular broadcast channel to be selected. The comparator produces a signal which indicates the coincidence or noncoincidence of the compared quantities. When the comparator generates a signal indicating a noncoincidence condition, it operates the sweep device; when the comparator output corresponds to a coincidence condition, operation of the sweep device is discontinued. Operation of the sweep device is initiated by application of a search signal thereto.

REFERENCES:
patent: 2825804 (1958-03-01), Rug
patent: 3671870 (1972-06-01), Wellhausen
patent: 3794925 (1974-02-01), Imazeki
patent: 3919646 (1975-11-01), Morgan
patent: 3931579 (1976-01-01), Ma et al.

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