An efficient method to compute LSFs from LPC coefficients

Line spectrum frequencies (LSFs) as one kind of important linear predictive coding parameters have been widely used in speech coding and speech recognition systems. This paper describes an efficient method to simplify the procedure for computing LSFs further. This method computes the intervals containing one root of P(x) and one root of Q(x) by successive bisections and interpolations, and then calculates LSFs also by successive bisections and interpolations. The simulation results show that this method can reduce the computation greatly