Pitch extraction using a generated decision function

A pitch extraction method is considered that employs a decision function whose maximum is greater than the possible spurious maxima of the analyzed signal on the pitch period. Smoothing by a wavelet window is proposed as a preprocessing procedure for the telephone signal. Experiments have shown that the proposed pitch extraction method is advantageous in almost all situations except for the case of the undistorted signal, where the LLK method proved to be the best one.