A score function of splitting band for two-band speech model

Two-band speech model which assumes lower band is a quasi-periodic component and upper band is a non-periodic component is widely used due to its natural and simple framework. In this paper, a score function is defined for splitting lower and upper band of two-band speech model and estimation method of band-splitting frequency which is the boundary of the two bands is proposed. The score function is calculated for each harmonic frequency using the normalized autocorrelation function of the time signal corresponding to the each sub-band divided by the given frequency. By using the score function, tracking technique is applied to the band-splitting frequency estimation procedure to reflect the continuity between neighboring frames. Experimental tests confirm that the proposed score function is effective for estimation of the band-splitting frequency and produces better results compared with the previous other methods. 2003 Elsevier B.V. All rights reserved.