Intermediate-frequency processing circuit

Details Intermediate-frequency processing circuit Intermediate-frequency processing circuit

1988-03-25

1989-03-21

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358143, H04N 701, H04N 704

Patent

active

048148741

ABSTRACT:
A first surface acoustic wave (SAW) filter has flat characteristics with a pass band which corresponds to a frequency ranging from a picture intermediate frequency to a sound intermediate frequency of the B/G system. A second SAW filter has double-humped characteristics which have pass bands near a sound intermediate frequency in the VHF high-band and UHF band of the L system, and near a sound intermediate frequency in the VHF low-band of the L system. When a tuned frequency of a video tank circuit is switched to a frequency ranging between the picture intermediate frequency of the B/G system and the picture intermediate frequency in the VHF low-band of the L system, a video IC obtains either picture and sound demodulation outputs of the B/G system or a picture demodulation output of the L system from the output of the first SAW filter. When a tuned frequency of a sound tank circuit is switched to a frequency ranging between the sound intermediate frequency in the VHF high-band and UHF band of the L system and the sound intermediate frequency in the VHF low-band of the L system, a sound IC obtains a sound demodulation output of the L system from the second SAW filter.

REFERENCES:
patent: 4156253 (1979-05-01), Steudel
patent: 4611227 (1986-09-01), Brockhurst et al.

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