Fast Computation of Line Spectral Frequencies using FFT

S.-W. Park (USA)


Signal Processing in Communications, Line Spectral Frequencies, CDMA.


A simple and fast method of computing line spectral frequencies (LSF) is presented in this paper. Instead of using costly iterative root finding algorithms, FFT is used to find LSF parameters. It has been shown that when the prediction order is between 10 and 14, 256-point FFT is enough to estimate all LSF parameters that give an acceptable quality. LSF parameters obtained using 512 point FFT give a transparent quality.

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