Adaptive active noise control system with double talk handling and associated method

An adaptive active noise control (ANC) system comprising:

• an ANC circuit, arranged to generate an anti-noise signal, wherein the ANC circuit comprises at least one adaptive filter;
• and
• a control circuit, arranged to receive a first input signal derived from a reference signal output by a reference microphone that picks up ambient noise, receive a second input signal derived from an error signal output by an error microphone that picks up remnant noise resulting from noise reduction, and perform a comparison operation based on a first characteristic value of the first input signal and a second characteristic value of the second input signal to control the at least one adaptive filter;
• wherein the control circuit is arranged to perform the comparison operation for double talk detection.

An adaptive active noise control (ANC) method comprising:

• generating, by an ANC circuit, an anti-noise signal, wherein the ANC circuit comprises at least one adaptive filter;
• receiving a first input signal derived from a reference signal that is generated by picking up ambient noise;
• receiving a second input signal derived from an error signal that is generated by picking up remnant noise resulting from noise reduction, comprising:
• applying a filtering operation upon the anti-noise signal output from the at least one adaptive filter to generate a filtered anti-noise signal;
• and
• combining the filtered anti-noise signal and the error signal to obtain the second input signal;
• and
• performing a comparison operation based on a first characteristic value of the first input signal and a second characteristic value of the second input signal to control the at least one adaptive filter.