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ANC NOISE ACTIVE CONTROL AUDIO HEAD SET PREVENTING INFLUENCE OF SATURATION OF FEEDBACK MICROPHONE SIGNAL
ANC NOISE ACTIVE CONTROL AUDIO HEAD SET PREVENTING INFLUENCE OF SATURATION OF FEEDBACK MICROPHONE SIGNAL
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机译:ANC噪声有源控制音频耳机防止反馈麦克风信号饱和
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摘要
PROBLEM TO BE SOLVED: To propose a new ANC noise reduction technology.;SOLUTION: A head set (HS) is configured to include an active noise control function, and have an internal ANC microphone (MP) arranged in an audio cavity, and send out a signal including an audio noise component. A digital signal processor DSP comprises: a feedback (FB) ANC branch that applies a filtering transmission function HFB2 to a signal to be sent out by the ANCMP; and means that mixes a signal of the FB branch with an audio signal M to be reproduced, and the HS comprises a movement sensor. The DSP comprises means that simultaneously analyzes a signal to be sent out by the internal MP and a signal to be sent out by the movement sensor, and verifies whether a current characteristic of these signals satisfies a set of prescribed references. In an upstream of a FBANC filter, a saturation preventive filter HFB1 is selectively switched according to a result of the verification, and filtering HEQ2 of an equalization branch of the signal M to be reproduced is changed by a similar saturation preventive filter HEQ1.;COPYRIGHT: (C)2016,JPO&INPIT
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