Accuracy improved double-talk detector based on state transition diagram
نویسندگان
چکیده
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.
منابع مشابه
Coherence Based Double Talk Detector with Adaptive Threshold
Acoustic echo cancellation is one of the oldest applications of the adaptive filters and today part of each speakerphone. An important block of each acoustic echo canceller is the double talk detector. It blocks the adaptation of the filter when near end voice is present and thus preventing the adaptive filter from diverging from the optimal position. In this paper we present an improved versio...
متن کاملImproving monaural speaker identification by double-talk detection
This paper describes a novel approach to improve monoaural speaker identification where two speakers are present in a single-microphone recording. The goal is to identify both of the underlying speakers in the given mixture. The proposed approach is composed of a double-talk detector (DTD) as a preprocessor and speaker identification back-end. We demonstrate that including the double-talk detec...
متن کاملDouble Talk Detection in Acoustic Echo Cancellation based on Variance Impulse Response
In this paper we represent a new echo canceller using double talk detector that depends on variance impulse response. In this method detection is performed by calculating the variance of maximum value tap of recent tap in adaptive filter. Adaptive filter will stop updating its coefficients during double talk and it will resume updating after double talk. Simulation results by using real speech ...
متن کاملA robust noise and echo canceller
The performance of an echo canceller systems deployed in a practical communication environment (i.e. the presence of background noise and the possible double talk scenario) depends on an accurate Voice Activity Detector (VAD) and an effective filter coefficient adaptation strategies. Accuracy of the VAD, which affects the coefficient adaptation strategy, is itself affected by the presence of ba...
متن کاملA double-talk detector for acoustic echo cancellation applications
In acoustic echo cancellation applications, the presence of near-end speech causes divergence of the adaptive "lter which is used to model the echo path. A robust acoustic echo canceler is the one which is equipped with an algorithm that detects periods of double talk and puts the adaptive algorithm into a double-talk handling mode. This paper proposes a double-talk detector based on an angle m...
متن کامل