H - Electricity – 04 – R
Patent
H - Electricity
04
R
H04R 3/00 (2006.01) G10K 11/16 (2006.01) G10L 21/02 (2006.01) H04R 3/02 (2006.01) H04R 5/033 (2006.01)
Patent
CA 2435771
The present invention relates to a device that dynamically applies the energy of the voice as a control signal to modulate the volume of an input microphone signal to achieve dynamic voice activated noise suppression. When the energy of the microphone signal is low, very little amplification energy is applied to boost the volume of the microphone signal. If the energy is medium to high, amplification energy is applied to the microphone output sufficient to raise the signal level to audible levels. The perceptual effect of this is that the ambient noise appears (to the listener) to be removed from the signal. This is due to the psychoacoustic effect that louder signals tend to mask softer signals (even if the softer signals are noise). Generally, even in a high noise environment, the energy of the noise signal is somewhat lower than the direct spoken input to a microphone, due to the proximity of the typical microphone to the speaker's mouth. When the person stops speaking, the volume of the amplified noise input immediately (within 6 - 20 milliseconds) tracks the voice energy downward and is thus perceived by the listener to be suppressed immediately after the speaker finished their spoken utterances.
Brickhouse Paul
Dame Stephen G.
Prince Allan
Chelton Avionics Inc.
Fetherstonhaugh & Co.
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