Unbiased residual echo power estimation for hands-free telephony
Gerald Enzner, Rainer Martin, Peter Vary · IEEE International Conference on Acoustics Speech and Signal Processing · 2002
Residual echo arises in hands-free telephony equipment due to insufficient echo canceler convergence, but can be suppressed using a postfilter. The most important control parameter for postfilter adaptation is therefore the residual echo power spectral density (PSD). In this contribution we present and compare residual echo PSD estimation techniques. We introduce a new partitioned block-adaptive estimator delivering unbiased residual echo PSD estimates in strongly reverberant and noisy acoustic environments.