Automatic continuous tuning control apparatus for a receiver

Details Automatic continuous tuning control apparatus for a receiver Automatic continuous tuning control apparatus for a receiver

1981-06-10

1984-10-09

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455165, 455168, H03J 722

Patent

active

044765800

ABSTRACT:
A tuning control apparatus of a receiver having an electronic tuner comprises a tuning voltage generating circuit including a window comparator, a charge pump and a low-pass filter. An S curve signal is applied to the window comparator to make a search controlled by means of a voltage synthesizer system using the S curve signal until the receipt of a broadcasting signal. If an optimum tuning point is established through the search control, the local oscillation frequency at that time is counted to provide frequency division ratio data. A phase-locked loop is operated as a function of the frequency division ratio data on the occasion of the above described optimum tuning point, whereby reception of the broadcasting signal is continued. Preferably, an automatic frequency control operation is performed before the phase-locked loop is operated.

REFERENCES:
patent: 4031549 (1977-06-01), Rast et al.
patent: 4077008 (1978-02-01), Rast et al.
patent: 4081752 (1978-03-01), Sumi
patent: 4245349 (1981-01-01), Kumaoka et al.
patent: 4254506 (1981-03-01), Henderson et al.
patent: 4264977 (1971-04-01), Deiss
patent: 4271434 (1981-06-01), Sakamoto
patent: 4344187 (1972-08-01), Ogita et al.

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