Directionality Induced Robust Acoustic Echo Canceler Adaptation

A vehicle audio system comprising:

• at least one vehicle speaker configured to generate audio in an interior of a vehicle;
• multiple microphones each configured to obtain audio within the interior of the vehicle;
• and
• a vehicle control module configured to:
• receive an input signal via the multiple microphones;
• split the input signal received via the multiple microphones into a parallel domain signal and an orthogonal domain signal;
• select a constant step size value for an orthogonal domain filter weight and a variable step size value for a parallel domain filter weight;
• adapt the orthogonal domain filter weight according to the orthogonal domain signal and the constant step size value;
• adapt the parallel domain filter weight according to the parallel domain signal and the variable step size value;
• combine the adapted orthogonal domain filter weight and the adapted parallel domain filter weight to define a total filter weight;
• and
• apply the total filter weight to the received input signal to perform a signal processing operation on the received input signal, prior to audio output of the received input signal.