Title :
A double-talk detector based on coherence
Author :
Gansler, T. ; Hansson, Maria ; Ivarsson, Carl-Johan ; Salomonsson, Göran
Author_Institution :
Dept. of Appl. Electron., Lund Inst. of Technol., Sweden
fDate :
11/1/1996 12:00:00 AM
Abstract :
We address the problem of detecting double-talk in a full duplex transmission line. A new double-talk detector (DTD) based on measuring the similarity between the far- and near-end speech signals is proposed. The detector is block oriented and operates in the frequency domain where the similarity between the signals is measured by means of the coherence function. The coherence is estimated with a short sequence of data by exploiting the multiple window spectrum estimation technique. Theoretical evaluation and examples of its performance are presented. The proposed DTD operates accurately in a wide range of situations, i.e., a difference in speech levels and hybrid attenuations ranging from 0 to 20 dB
Keywords :
coherence; echo suppression; frequency-domain analysis; signal detection; spectral analysis; speech processing; telephone networks; access networks; block oriented detector; coherence; coherence function; double-talk detector; echo suppression; far-end speech signals; frequency domain; full duplex transmission line; hybrid attenuations; local telephone networks; long distance telephone network; multiple window spectrum estimation; near-end speech signals; short data sequence; signal similarity measurement; speech levels; Circuits; Detectors; Echo cancellers; Equations; Frequency estimation; Signal processing; Signal processing algorithms; Speech; Transmission line measurements; Transmission line theory;
Journal_Title :
Communications, IEEE Transactions on
