Spatially based adaptive filter for a double talk recovery method

A system comprising:

• data processing hardware;
• and
• memory hardware in communication with the data processing hardware, the memory hardware storing instructions that when executed on the data processing hardware cause the data processing hardware to perform operations comprising:
• receiving a first audio signal and a second audio signal simultaneously at an adaptive filter of an acoustic echo canceler (AEC), the first audio signal corresponding to a third-party source and the second audio signal corresponding to a target source;
• estimating an echo signal present in the second audio signal based on the simultaneous first audio signal and the second audio signal received at the adaptive filter;
• estimating an echo signal directivity of the estimated echo signal;
• determining a target directivity of the target source;
• determining a directional target-to-echo signal ratio based on the estimated echo signal directivity and the determined target directivity;
• determining an adaptive floor of the directional target-to-echo signal ratio utilizing recursive averaging;
• comparing the estimated echo signal directivity with the determined target directivity;
• detecting that a current target-to-echo signal ratio exceeds the adaptive floor by a threshold;
• detecting a divergence of an estimated echo signal direction toward a target source direction based on the detected threshold exceedance to determine AEC divergence due to a double talk scenario;
• and
• resetting the adaptive filter of the AEC.

A computer-implemented method for an adaptive filter system of a vehicle, the method when executed by data processing hardware causes the data processing hardware to perform operations comprising:

• receiving a first audio signal and a second audio signal simultaneously at an adaptive filter of an acoustic echo canceler (AEC), the first audio signal corresponding to a third-party source and the second audio signal corresponding to a target source;
• estimating an echo signal present in the second audio signal based on the simultaneous first audio signal and the second audio signal received at the adaptive filter;
• estimating an echo signal directivity of the estimated echo signal;
• determining a target directivity of the target source;
• determining a directional target-to-echo signal ratio based on the estimated echo signal directivity and the determined target directivity;
• determining an adaptive floor of the directional target-to-echo signal ratio utilizing recursive averaging;
• comparing the estimated echo signal directivity with the determined target directivity;
• detecting that a current target-to-echo signal ratio exceeds the adaptive floor by a threshold;
• detecting a divergence of an estimated echo signal direction toward a target source direction based on the detected threshold exceedance to determine AEC divergence due to a double talk scenario;
• and
• executing a counter measure of the AEC.