A Novel Approach to Calculation of Line Spectral Frequencies Based on Inter-Frame Ordering Property

A problem of calculation of line spectral frequencies (LSF) is considered. The investigation of mutual LSF location on adjacent quasi-stationary frames is performed. It was found that in majority of cases LSF inter-frame ordering property takes place. On this basis a new approach to LSF calculation is proposed. The LSF localization is mainly reduced to verification of inter-frame ordering property. The computational expenses are reduced in 3.4 times in comparison with widely used Kabal´s method. Besides, the maximum number of operations is lower than the minimum expenses of accelerated Kabal´s method. The method was implemented on fixed-point DSP and showed stable performance