Receiving apparatus for performing digital broadcast channel sel

Details Receiving apparatus for performing digital broadcast channel sel Receiving apparatus for performing digital broadcast channel sel

1997-10-27

2000-10-03

Chin, Stephen

Pulse or digital communications

Receivers

348731, 348732, H03K 900

Patent

active

061283525

ABSTRACT:
A receiving apparatus capable of shortening the channel search time comprising a channel selection circuit comprising a channel selection control circuit which sets the oscillation frequency of a local oscillation circuit shifted over the entire area in the frequency bandwidth when a control signal is received and sets the oscillation frequency to a designated frequency when another control signal is received, a mixing circuit which mixes a high frequency signal with a local oscillation signal to convert the same to an intermediate frequency signal, and an AGC which amplifies the intermediate frequency signal at the time of input of the control signal and adjusts the intermediate frequency signal level to a predetermined level at the time of non-input; a discrimination circuit which discriminates each position of the received channel by a digital signal; and a control circuit which outputs the control signal to the channel selection control circuit and the AGC, makes the discrimination circuit discriminate the channel positions, and then stops the output of the control signal and outputs the second control signal for setting the frequency of the local oscillation circuit by the result of discrimination of the discrimination circuit to the channel selection control circuit.

REFERENCES:
patent: 3859599 (1975-01-01), Peil
patent: 4280140 (1981-07-01), Skerlos
patent: 4295165 (1981-10-01), Watanabe et al.
patent: 4302778 (1981-11-01), Tanaka
patent: 5636250 (1997-06-01), Scarpa
patent: 5654774 (1997-08-01), Pugel et al.
patent: 5715012 (1998-02-01), Patel et al.
patent: 5805241 (1998-09-01), Limberg

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