Acoustic Echo Cancellation

摘要

A method and system for acoustic echo cancellation stores received far-end data in a first buffer. When the far-end data in the first buffer exceeds a predefined length, the stored far-end data is used to calculate echo estimate data. The echo estimate data is stored in a second buffer. Whenever microphone data is received the error data is calculated independent of echo estimate data availability. In particular, subsequent to sufficient echo estimate data being stored in the second buffer and responsive to the reception of the microphone data, the error data is calculated by subtracting, from the microphone data, corresponding echo estimate data stored in the second buffer.

主权项

1. A method of calculating error data in acoustic echo cancellation, the method comprising:
storing received far-end data in a first buffer; subsequent to the far-end data in the first buffer exceeding a predefined length, calculating echo-estimate data using the stored far-end data; storing the echo estimate data in a second buffer; receiving microphone data; and subsequent to sufficient echo estimate data being stored in the second buffer, calculating error data by subtracting, from the microphone data, corresponding echo estimate data stored in the second buffer, thereby substantially avoiding a delay, caused by processing of the far-end data, in calculating the error data after reception of the microphone data.