Voice echo suppression in engine order cancellation systems

An engine order cancellation (EOC) system comprising:

• a noise signal generator, having a frequency generator, adapted to generate a noise signal in response to an input;
• a controllable filter adapted to generate an anti-noise signal based in part on an adaptive transfer characteristic, the anti-noise signal to be radiated by a speaker as anti-noise within a cabin of a vehicle;
• an adaptive filter controller, including a processor and memory, programmed to control the adaptive transfer characteristic of the controllable filter based on the noise signal received from the noise signal generator, an error signal received from a microphone located in the cabin of the vehicle, and an adaptation parameter;
• and
• a signal analysis controller, including a processor and memory, programmed to:
• detect a non-stationary event based on parameters sampled from a current frame of the error signal;
• and
• modify at least one of the adaptation parameter and the error signal in response to detecting the non-stationary event.

A non-transitory computer readable medium storing instructions for engine order cancellation (EOC), the instructions comprising:

• one or more instructions that, when executed by one or more processors, cause the one or more processors to:
• receive noise signals from at least one noise signal generator;
• generate an anti-noise signal to be radiated by a speaker as anti-noise within a cabin of a vehicle, the anti-noise signal being generated by at least one controllable filter based in part on the noise signals from the at least one noise signal generator;
• receive error signals from at least one microphone located in the cabin of the vehicle;
• detect a non-stationary event based on signal parameters sampled from a frame of at least one error signal;
• and
• modify the anti-noise signal for the duration of the frame in response to detecting the non-stationary event.