Single channel if for video and audio

Details Single channel if for video and audio Single channel if for video and audio

1986-04-30

1987-12-29

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358188, 358143, H04N 562, H04N 544, H04N 704

Patent

active

047164646

ABSTRACT:
A stereo television receiver processes the picture and intercarrier sound carrier signals in a common intermediate frequency (IF) section. The IF characteristic is modified such that the overall transmission characteristic of the receiver exhibits a modified Nyquist slope having a shelf portion of flat attenuation over a frequency band including within it the picture carrier frequency. This reduces the incidental phase modulation of the picture carrier signal due to asymmetrical attenuation of sidebands by the Nyquist slope, thereby reducing the associated intercarrier buzz.

REFERENCES:
patent: 3894286 (1975-07-01), Armstrong
patent: 4006290 (1977-02-01), Momberger et al.
patent: 4271433 (1981-06-01), Theriault
patent: 4484222 (1984-11-01), Banach
patent: 4490743 (1984-12-01), Mycynek et al.
patent: 4513323 (1985-04-01), Patel
patent: 4602287 (1986-07-01), Fockens
patent: 4602288 (1986-07-01), Everett
patent: 4639786 (1987-01-01), Tamer et al.

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