Wearable active noise reduction (anr) device having low frequency feedback loop modulation

A feedback compensator for an active noise reduction (ANR) device configured to output a noise reduction signal to an electroacoustic transducer in response to a feedback signal from a feedback microphone, wherein the feedback compensator comprises:

• a tunable filter that modulates a loop gain in the noise reduction signal in response to an adverse low frequency event being detected in the noise reduction signal, the amount of loop gain being based on an adjusted frequency multiplier value (FMV);
• a threshold processor that compares the noise reduction signal with a threshold to detect the adverse low frequency event, and in response to the adverse low frequency event being detected, calculates a current FMV;
• and
• a logic processor configured to calculate the adjusted FMV based on the current FMV and a previous FMV.

A wearable audio device having active noise reduction (ANR), comprising:

• a feedback microphone;
• an electroacoustic transducer;
• and
• a feedback compensator configured to output a noise reduction signal to the electroacoustic transducer in response to a feedback signal from the feedback microphone according to a method that comprises:
• modulating a loop gain in the noise reduction signal in response to an adverse low frequency event being detected in the noise reduction signal, the amount of loop gain being based on an adjusted frequency multiplier;
• analyzing the noise reduction signal to detect the adverse low frequency event, and in response to the adverse low frequency event being detected, calculating a current frequency multiplier;
• and
• determining the adjusted frequency multiplier based on the current frequency multiplier and a previous frequency multiplier.