Audio filter system

An audio filter system for a vehicle, the audio filter 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, from a sensor array, multiple audio signals;
• identifying a design constraint based on the multiple audio signals;
• generating an asymmetrical white noise gain surface in response to a design filter weight exceeding a filter weight maximum;
• converting the asymmetrical white noise gain surface to a symmetrical white noise gain surface using a whitening function;
• identifying an extremum point on the symmetrical white noise gain surface for the design constraint;
• transforming the extremum point from the symmetrical white noise gain surface to the asymmetrical white noise gain surface;
• updating the design constraint with the extremum point;
• and
• filtering the multiple audio signals using the extremum point.

A computer-implemented method executed by data processing hardware that causes the data processing hardware to perform operations comprising:

• receiving multiple audio signals from a sensor array, the multiple audio signals including a target audio signal and interference audio signals;
• identifying a design constraint based on the multiple audio signals, the desired constraint including a pass constraint corresponding to the target audio signal and a null constraint corresponding to the interference audio signals;
• comparing a design filter weight of the design constraint with a filter weight maximum;
• designing an audio filter using the desired constraint;
• and
• filtering the multiple audio signals using the designed audio filter.