Implementation of Acoustic Echo Cancellation For PC Applications Using MATLAB
نویسنده
چکیده
The communication technique has changed a lot in the recent years. Today people are more interested in hands-free communication with the use of a loudspeaker and a microphone, in stead of a normal telephone. However, the presence of a large acoustic coupling between the loudspeaker and microphone would produce a loud echo that would make conversation difficult. The solution to these problems is the elimination of the echo with an echo cancellation or echo suppression algorithm. However, traditional methods are not sufficient. The objective of this thesis is to find out a good echo removal algorithm, which is capable of providing convincing results for PC application. The basic components of an echo canceller are an adaptive filter, and a double-talk detector. The adaptive filter estimates the echo path, based on which a replica of the echo is created and subtracted from the combination of the actual echo and the near-end speech signal. Double talk occurs when both ends are talking. The task of a doubletalk detector is to sense the doubletalk, so that to stop the adaptive filter in order to avoid divergence. Since there has been a revolution in the field of personal computers in recent years, this work attempts to implement the acoustic echo canceller algorithm on a PC with the help of the MATLAB software.
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تاریخ انتشار 2007