Electrical audio signal processing systems and devices – Noise or distortion suppression
Patent
1997-08-29
2000-06-06
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Noise or distortion suppression
381172, H04B 1500
Patent
active
060728825
ABSTRACT:
A method and apparatus for sensing audio frequency-pressure modulation of the moisture content of the atmosphere caused by a moisture-laden audio source, such as a live human voice, is disclosed. A first light emitter is provided to generate a first light beam. An audio source that emits moisture, and the environment, modulate the first light beam to generate a first modulated light beam. A first detector is provided to detect and demodulate the first modulated light beam to recover an uncompensated audio signal. A second light emitter is provided to generate a second light beam. The second light beam is modulated by the environment and not by the audio source to produce a second modulated light beam. A second detector is provided to detect and demodulate the second modulated light beam to recover the signal component caused by environmental conditions. A differential amplifier is provided to generate a compensated output signal representing the difference between the uncompensated audio signal and the signal component caused by environmental conditions. The output signal can be transmitted for amplification, distribution, and/or recording.
REFERENCES:
patent: 4412105 (1983-10-01), Muscatell
patent: 4479265 (1984-10-01), Muscatell
patent: 4594695 (1986-06-01), Garconnat
Andrews, Jr. Warner B.
Hale Kelly H.
Henderson P. Michael
Johnston James W.
Siann Jonathan I.
Conexant Systems Inc.
Harvey Minsun Oh
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