Noise reduction apparatus
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United States of America Patent
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Issued Date -
Feb 12, 2009
app pub date -
Nov 12, 2004
filing date -
Nov 12, 2004
priority date (Note) -
Abandoned
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Abstract
Effective reduction is made of direct sound or diffracted sound of a noise propagating from plural directions. Three microphones (18.sub.k-1, 18.sub.k, 18.sub.k+1) are disposed and: noise is detected by each of the microphones; delay signals are generated by delaying plural times a signal that has been output from 2 of the microphones (18.sub.k-1, 18.sub.k+1); the output signal from the remaining microphone (18.sub.k) is added to 2 of the delayed signals and input to respective speakers of a speaker unit; a control sound is output from the speaker unit in 3 directions (L, C, R); and reduction is made of direct sound or diffracted sound of a noise propagating from each of the directions.
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