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