Low delay nearend speech detector for acoustic echo cancellation

Double talk detector (DTD) also called nearend signal detector (NSD) is an important control unit of the Acoustic echo cancellers (AEC) for full duplex communications system. Usually, the standard NSDs have delay in detection of onset of nearend signal. To reduce this detection delay, new triggering logic is proposed in this paper. This triggering logic can work with any normalized NSD algorithm which has delay in detection of onset of the nearend signal. This detection logic also improves the double talk detection for low or weak nearend signal. The proposed logic is implemented with Angle based Double Talk Detector (ABM) [1] and tested for many real time signals captured on different hardware platforms. The test results prove the significance of proposed NSD and verify the expected performance. The additional complexity required for the proposed triggering logic is marginal.