Patent ID: 9384727
Filing Date: 2016-07-05
CPC Classification: G10K

Claim Text:
1. An active sound reduction system for attenuation of sound emitted by a primary sound source, the system comprising: a speaker used as a secondary sound source to produce an attenuating sound that superposes the sound emitted by the primary sound source; a reference microphone to receive the sound emitted by the primary sound source; an error microphone being a directional microphone allocated and pointing to the speaker to form a speaker/microphone pair, the error microphone being configured to receive a residual sound resulting from a superposition of the primary and attenuating sounds, the error microphone being located in a quiet zone spaced apart from the primary sound source; the error microphone, the speaker and the primary sound source being arranged substantially collinear; and a control unit configured to receive an output reference signal from the reference microphone representing the sound received by the reference microphone and receive an output error signal from the error microphone representing the sound received by the error microphone, and further configured to calculate a control signal based on the output reference signal and the output error signal in order to control the speaker using the control signal such that the quiet zone is created.