Audio communication device and method using fixed echo cancellation filter coefficients

摘要

Methods, apparatuses, systems, and software are disclosed for providing a phone or other audio communication device with a fixed-path acoustic echo cancellation feature that compensates for a fixed-path acoustic coupling caused by transmission of sound from one or more speakers to one or more microphones through, for instance, the phone body itself.

主权项

1. An apparatus, comprising:
a downlink; and an echo cancellation module configured to filter a first signal on the downlink using a dynamic set of filter coefficients and one static set of filter coefficients selected from a static first set of filter coefficients and a static second set of filter coefficients to generate a second signal, and to generate a third signal based on a difference between the second signal and a fourth signal that is based on sound received by a first microphone, wherein the echo cancellation module is configured to use the static first set of filter coefficients for a first mode of operation and the static second set of filter coefficients for a second, different mode of operation and wherein the one static set of filter coefficients for the first mode of operation improves a single talk echo performance by about 5 to 10 dB compared to filtering the first signal using only the dynamic set of filter coefficients.