Channel selection system for an electronic tuner

Details Channel selection system for an electronic tuner Channel selection system for an electronic tuner

1982-08-03

1984-03-20

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 455164, 455165, H04B 126

Patent

active

044385285

ABSTRACT:
In a channel selection system using a PPL frequency synthesizing method in which the local oscillation frequency of a tuner is frequency-divided and compared with the frequency and the phase of a reference oscillator thereby to control the tuning voltage of a tuner, a channel selection system disclosed by this invention comprises a controller, a variable frequency divider the frequency division ratio of which is controlled by the above controller, an AFC circuit connected to this tuner, a first comparator having a first threshold voltage for detecting an H level of the inverted S character output of the AFC circuit, a second comparator having a second threshold voltage for detecting an L level of the inverted S character output, and a delay circuit connected to the output of at least one of the first and second comparators and delaying the rising edge of the comparison output.

REFERENCES:
patent: 4280140 (1981-07-01), Skerlos
patent: 4367558 (1983-01-01), Gercekci et al.
patent: 4387469 (1983-06-01), Miyazaki et al.
patent: 4397038 (1983-08-01), Rzeszewski

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