Intermediate frequency saw filter with nyquist phase modulation

Details Intermediate frequency saw filter with nyquist phase modulation Intermediate frequency saw filter with nyquist phase modulation

1983-11-21

1986-07-22

LaRoche, Eugene R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358144, 333194, 333196, 310313C, H04N 562, H03N 308

Patent

active

046022880

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: 4030050 (1977-06-01), Deacon et al.
patent: 4237485 (1980-12-01), Saito et al.
patent: 4393358 (1983-07-01), DeVries
Nakagawa, Y. et al., "Temperature-Stable Surface Acoustical Wave Substrate" The Transaction of the IEEE of Japan, vol. E62, #11, Nov. 1979, pp. 790-791.
Takahashi, S. et al., "SAW IF Filter on LiTaO.sub.3 for Color TV Receiver" IEEE Transaction on Consumer Electronic; vol. CF-24, #3, 8/1978; pp. 337-346.
Fockens, P. et al., "Intercarrier Buzz Phenomena Analysis and Uses"; IEEE Trans on Carrier Electronic; vol. CG-27, #3, Aug. 1981, pp. 381-395.

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