Abstract:

In order to use a microphone array to locate speech signals preferably and obtain higher positioning accuracy, the constructive method and performance characteristics of TDOA (Time-Delay of Arrival )algorithm are studied, reasons and environment of causing errors in locating processing are analyzed, and some methods that can reduce or eliminate the errors are proposed. Using the time-delays of signals from the same speech signal source between any two microphones in the array and the relationships within the time-delays, the locating results can be simulated on computers. The solutions proposed can improve the locating accuracy greatly and increase the utilization rate of the TDOA algorithm in practical application.

Key words: microphone array, locate, speech signal, time-delay of arrival(TDOA) algorithm, error