Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
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.
Chin Tommy P.
Edelman Lawrence C.
Emanuel Peter M.
Parker Michael D.
RCA Corporation
LandOfFree
Noise reduction for FM stereophonic systems and particularly use does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noise reduction for FM stereophonic systems and particularly use, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise reduction for FM stereophonic systems and particularly use will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2309453