An echo canceler circuit and method

摘要

An echo canceler circuit and method performs cascaded echo cancellation and noise suppression in a non-interfering manner. The echo canceler circuit includes pre-noise suppression logic, echo canceler coefficient logic, noise suppression logic and an echo canceler filter. The pre-noise suppression logic receives pre-echo canceler uplink data and downlink data, and in response produces pre-noise suppression uplink data. The echo canceler coefficient logic receives the pre-noise suppression uplink data and the pre-echo canceler uplink data, and in response produces filter coefficient data. The noise suppression logic receives the pre-noise suppression uplink data, and in response produces noise suppressed uplink data. The echo canceler filter receives the noise suppressed uplink data and the filter coefficient data and in response produces final uplink data.