DOUBLE TALK DETECTION METHOD BASED ON SPECTRAL ACOUSTIC PROPERTIES

摘要

This method of detecting the double talk situations in hands-free communication device is disclosed. In general, the method in accordance with the teachings of the present invention detects double talk conditions based on the acoustics of the spectrum of the returned echo signal and the natural frequency response difference between the transducers used. Input signal from the output of the input signal and the echo canceller from the far-end talker is received by the detector. K spectral subbands (subband) are generated for each input signal. From which the K subbands, based on inherent frequency differences between the far-end transducer and a near-end transducer, q subbands are selected. The spectral echo residual power is estimated at each subband. The output signal from the echo canceller for the estimated spectral echo power and the selected sub-band is compared with a predetermined threshold value. Based on this comparison, it is determined that the double talk situation is present is determined. ;