Patent ID: 7043424

Claim:
A method of pitch mark determination for a speech signal, the method comprising the steps of: acquiring a fundamental frequency and a plurality of fundamental frequency passband signals by using an adaptable filter; detecting a plurality of passing zero positions of the fundamental frequency passband signals; generating at least a candidate set of pitch marks from a plurality of passing zero positions, the generating step including: finding a highest position and a second highest position of the speech signals, using the passing zero positions, and finding a lowest position and a second lowest position of the speech signals, using the passing zero positions; and estimating the candidate set of pitch marks to generate a set of pitch marks by respectively calculating an aggregate error of each set of pitch marks, and then generating a corresponding set of pitch marks with a smallest aggregate error; wherein calculating the aggregate error is by separately calculating an aggregate error of the wave peak of the speech signals and an aggregate error of the wave trough of the speech signals.