Echo estimation and management with adaptation of sparse prediction filter set

A system comprising:

• one or more processors;
• and
• a non-transitory computer-readable medium storing instructions that, upon execution by the one or more processors, cause the one or more processors to perform operations of echo estimation or echo management on an input audio signal, the operations comprising:
• generating data values indicative of an N-bin, frequency domain representation of the input audio signal;
• and
• performing echo estimation on the input audio signal, including:
• adapting N prediction filters of a prediction filter set comprising the N prediction filters to generate a set of N adapted prediction filter impulse responses, where each of the N prediction filters is used to process audio data values in a respective bin of the N-bin frequency domain representation of the input audio signal, and N is a positive integer;
• and
• generating an estimate of echo content of the input audio signal including processing the N adapted prediction filter impulse responses, wherein said processing includes:
• generating a composite impulse response from a statistical function of the adapted prediction filter impulse responses;
• and
• generating an estimate of transmission delay for echo content of the input audio signal from the composite impulse response.

A non-transitory computer-readable medium storing instructions that, upon execution by one or more processors, cause the one or more processors to perform operations comprising:

• determining a prediction filter set comprising N prediction filters, where each of the N prediction filters are used to process audio data values in a respective bin of a frequency domain representation of the input audio signal, and N is a positive integer;
• and
• performing echo estimation on the input audio signal, including by adapting the N prediction filters to generate a set of N adapted prediction filter impulse responses, and generating an estimate of echo content of the input audio signal including by processing the N adapted prediction filter impulse responses,
• wherein performing the echo estimation includes a step of generating a composite impulse response from a statistical function of the adapted prediction filter impulse responses, and generating an estimate of transmission delay for echo content of the input audio signal from the composite impulse response.