| CPC G10K 11/17817 (2018.01) [G10K 11/17854 (2018.01)] | 16 Claims |
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1. An improved noise separation hybrid active noise cancellation system, comprising:
a reference audio receiving device, receiving a reference audio source and outputting a reference audio source signal based on the reference audio source;
an error audio receiving device, receiving an error audio source and outputting an error audio source signal based on the error audio source;
an audio output device, outputting an audio signal; and
an audio processing device, connected to the reference audio receiving device, the error audio receiving device and the audio output device; the audio processing device comprising a feed-forward noise cancellation filter module, a feedback noise cancellation filter module, a mixer, a noise shaper, a first infinite impulse response filter and a second infinite impulse response filter; the feed-forward noise cancellation filter module used for performing feed-forward noise cancellation on the reference audio signal received from the reference audio receiving device in order to obtain a feed-forward noise cancellation signal; the feedback noise cancellation filter module used for performing feedback noise cancellation on the error audio source signal received from the error audio receiving device in order to obtain a feedback noise cancellation signal; and transmitting the feed-forward noise cancellation signal and the feedback noise cancellation signal to the mixer to perform wave mixing, and outputting a noise cancellation signal after mixing to the audio output device; and
wherein the noise shaper detects a noise bandwidth distribution of the error audio source signal, such that when the noise shaper detects an irregular noise, a coefficient of the first infinite impulse response filter is adjusted to set the first infinite impulse response filter as a low-pass filter, and the first infinite impulse response filter with the corrected coefficient converts the error audio source signal into a low frequency audio source correction signal for outputting to a feed-forward least mean square filter of the feed-forward noise cancellation filter module; when the noise shaper detects a regular noise, a coefficient of the second infinite impulse response filter is adjusted to set the second infinite impulse response filter as a band-pass filter, and the second infinite impulse response filter with the corrected coefficient converts the error audio source signal into a designated bandwidth audio source correction signal for outputting to a feedback least mean square filter of the feedback noise cancellation filter module.
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