Echo canceller E-side speech detector

摘要

The detection of echo is enhanced using a coarse near-end speech detector (206-2) at a Y-side of an echo canceller (206) and using a more accurate near-end speech detector (206-2) at the E-side of the echo canceller, such that the latter detector uses a representation of far-end speech and a threshold value to determine if the magnitude of the echo canceller output (e(k)) is larger than that of an echo signal only. If it is, and there is an absence of an indication of the presence of near-end speech from the coarse detector, then the more accurate speech detector adjusts the value of the threshold in a first direction; otherwise it adjusts the threshold in a second direction, to more "finely tune" such accuracy. <IMAGE>