Noise reduction apparatus
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United States of America Patent
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Issued Date -
Dec 16, 2004
app pub date -
Jun 8, 2004
filing date -
Jun 12, 2003
priority date (Note) -
Abandoned
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Abstract
A noise reduction apparatus is capable of suppressing deterioration of an aural sensing level due to noise existing in a sound field. The apparatus synthesizes a signal obtained by adding a predetermined delay to a sound field noise and reversing and amplifying the signal with an electric signal from a sound reproduction system to obtain a sound pressure output by using a first signal processing part. On the other hand, the apparatus synthesizes a signal obtained by delaying an electric signal from the sound reproduction system by a predetermined period and reversing and amplifying the signal with an electric signal obtained from a sound pressure in the proximity of a concha of a listener to extract a residual noise component by using a second signal processing part. The apparatus controls the delay amounts and the gains set by the first and second signal processing parts so as to minimize an extraction signal.
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