Audio processing circuit using leakage detection to control one or more adaptive non-active noise control filters and associated method

An audio processing method comprising:

• controlling, by at least one audio filter, an output signal for an audio function;
• generating, by at least one adaptive non-anti noise control (non-ANC) filter, at least one non-anti-noise signal according to an audio playback signal;
• performing leakage detection according to a first input signal and a second input signal, wherein the first input signal is indicative of noise signal signature, and the second input signal is derived from an error signal output by an error microphone that picks up remnant noise resulting from the audio function;
• and
• adjusting the at least one adaptive non-ANC filter according to a leakage detection result.

An audio processing circuit comprising:

• at least one adaptive non-active noise control (non-ANC) filter, arranged to generate at least one non-anti-noise signal according to an audio playback signal;
• and
• a leakage detection circuit, arranged to perform leakage detection according to a first input signal indicative of noise signal signature and a second input signal derived from an error signal, and adjust the at least one adaptive non-ANC filter according to a leakage detection result,
• wherein the at least one adaptive non-ANC filter is adjusted without being applied a least mean square (LMS) based algorithm.