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ACTIVE SOUND REDUCTION SYSTEM AND METHOD

  • US 20120163626A1
  • Filed: 07/30/2010
  • Published: 06/28/2012
  • Est. Priority Date: 08/07/2009
  • Status: Active Grant
First Claim
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1. Active sound reduction system (10,50) for attenuation of sound emitted by a primary sound source, especially for attenuation of snoring sounds emitted by a human being,comprising a primary sound source (12),at least one speaker (24,64,66,68) as a secondary sound source for producing an attenuating sound to be superposed with the sound emitted by said primary sound source (12),a reference microphone (28) for receiving sound from said primary sound source (12),at least one error microphone (34,58,60,62) being allocated to each speaker (24,64,66,68) to form a speaker/microphone pair (42,52,54,56), said at least one error microphone (34,58,60,62) being provided as a directional microphone pointing at its allocated speaker (24,64,66,68) to receive residual sound resulting from the superposition of the sounds from the primary sound source (12) and the corresponding speaker (24,64,66,68),the error microphone (34,58,60,62) and speaker (24,64,66,68) of at least one speaker/microphone pair (42,52,54,56) and the primary sound source (12) being arranged substantially collinear,and a control unit (32) for controlling said at least one speaker (24,64,66,68), said control unit (32) being provided to receive an output reference signal of the reference microphone (28) representing the sound received by the reference microphone (28) and an output error signal of the at least one error microphone (34,58,60,62) representing the sound received by the at least one error microphone (34,58,60,62) and to calculate a control signal from the output reference signal and the output error signal.

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