Intermediate frequency filter with Nyquist phase modulation corr

Details Intermediate frequency filter with Nyquist phase modulation corr Intermediate frequency filter with Nyquist phase modulation corr

1983-11-21

1986-07-22

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 562

Patent

active

046022872

ABSTRACT:
The frequency response of an intermediate frequency filter for an intercarrier sound television receiver is modified to provide a substantially constant gain response portion over a predetermined range of frequencies centered about the 45.75 MHz intermediate frequency picture carrier. Picture carrier phase modulation induced by the Nyquist slope of the conventional intermediate frequency response is thereby eliminated over the predetermined frequency range reducing audio "buzz" by decreasing the phase modulation transferred to the 4.5 MHz intercarrier sound signal by the intermediate frequency picture carrier. In a preferred embodiment, the modified intermediate frequency response is established by a surface acoustic wave filter.

REFERENCES:
patent: 4470070 (1984-09-01), Griffis
patent: 4490743 (1984-12-01), Mycynek
patent: 4513323 (1985-04-01), Patel

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