Bi-magnitude processing framework for nonlinear echo cancellation in mobile devices

A computer program product comprising a nontransitory storage medium, the computer program product including code that, when executed by processing circuitry configured to reduce acoustic echo in an audio system including a loudspeaker and a microphone, causes the processing circuitry to perform a method, the method comprising:

• receiving, at the loudspeaker of the audio system, an audio signal from a source location remote from the audio system;
• performing a comparison operation on a magnitude of the audio signal and a threshold magnitude to produce a comparison result;
• in response to the comparison result indicating that the magnitude of the audio signal is less than the threshold magnitude:
• performing a first filtering operation on an input signal into the microphone of the audio system to produce a first filtered input signal;
• and
• transmitting the first filtered input signal to the source location;
• in response to the comparison result indicating that the magnitude of the audio signal is greater than the threshold magnitude:
• performing a second filtering operation on the input signal into the microphone of the audio system to produce a second filtered input signal, the second filtered input signal being different from the first filtered input signal;
• and
• transmitting the second filtered input signal to the source location.

An electronic apparatus configured to reduce acoustic echo in an audio system including a loudspeaker and a microphone, the electronic apparatus comprising:

• memory;
• and
• controlling circuitry coupled to the memory, the controlling circuitry being configured to:
• receive, at the loudspeaker of the audio system, an audio signal from a source location remote from the audio system;
• perform a comparison operation on a magnitude of the audio signal and a threshold magnitude to produce a comparison result;
• in response to the comparison result indicating that the magnitude of the audio signal is less than the threshold magnitude:
• perform a first filtering operation on an input signal into the microphone of the audio system to produce a first filtered input signal;
• and
• transmit the first filtered input signal to the source location;
• in response to the comparison result indicating that the magnitude of the audio signal is greater than the threshold magnitude:
• perform a second filtering operation on the input signal into the microphone of the audio system to produce a second filtered input signal, the second filtered input signal being different from the first filtered input signal;
• and
• transmit the second filtered input signal to the source location.