8th European Conference on Speech Communication and Technology

Geneva, Switzerland
September 1-4, 2003


Accuracy Improved Double-Talk Detector Based on State Transition Diagram

SangGyun Kim, Jong Uk Kim, Chang D. Yoo

KAIST, Korea

A double-talk detector (DTD) is generally used with an acoustic echo canceller (AEC) in pinpointing the region where far-end and near-end signal coexist. This region is called double-talk and during this region AEC usually freezes the adaptation. Decision variable used in DTD has a relatively longer transient time going from double-talk to single-talk than time going in opposite direction. Therefore, using a single threshold to pinpoint the location of double-talk region can be difficult. In this paper, a DTD based on a novel state transition diagram and a decision variable which requires minimal computational overhead is proposed to improve the accuracy of pinpointing the location. The use of different thresholds according to the state helps the DTD locate double-talk region more accurately. The proposed DTD algorithm is evaluated by obtaining a receiver operating characteristic (ROC) and is compared to that of Cho's DTD.

Full Paper

Bibliographic reference.  Kim, SangGyun / Kim, Jong Uk / Yoo, Chang D. (2003): "Accuracy improved double-talk detector based on state transition diagram", In EUROSPEECH-2003, 1421-1424.