Noise reduction for FM stereophonic systems and particularly use

Details Noise reduction for FM stereophonic systems and particularly use Noise reduction for FM stereophonic systems and particularly use

1982-11-30

1986-03-18

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358144, 358167, 358198, 381 13, H04N 704, H04N 521, H04N 560

Patent

active

045772266

ABSTRACT:
In a television system for recovering a stereophonic sound signal including a subcarrier signal, apparatus is provided including a bandpass filter for sensing the noise density of the recovered sound signal. A detector generates a control signal corresponding to the noise density sensed by the filter. The control signal is used to progressively attenuate the level of the subcarrier signal in response to increases of the sensed noise density. Although this gradually reduces the stereophonic separation, it provides a corresponding increase in the signal-to-noise ratio of the resulting reproduced stereophonic signal.

REFERENCES:
patent: 3099707 (1963-07-01), Dome
patent: 3219759 (1965-11-01), Dome
patent: 4032717 (1977-06-01), Mallon
patent: 4037057 (1977-07-01), Ogita et al.
patent: 4339722 (1982-07-01), Eilers et al.
patent: 4339828 (1982-07-01), Chasek
patent: 4356350 (1982-10-01), Ienaka
patent: 4356510 (1982-10-01), Nakayama
National Semiconductor Datasheet entitled "LM 1870 Stereo Demodulator with Blend", publ. by National Semiconductor Corp. in Jan. 1982.
National Semiconductor Datasheet entitled "LM 4500A High Fidelity FM Stereo Demodulator with Blend" publ. by National Semiconductor Corp. in Jan. 1982.

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