Optimization Design for Efficient Computation of Line Spectrum Pairs
LI Juan-juan · 2007
This paper proposes a new algorithm APF for calculating line spectrum pairs(LSP) of speech signal.LSP parameters can be obtained by solving an N-order non-linear equation relating to the linear predictive coding(LPC) coefficients.First,one root of the N-order nonlinear equation is derived with the Aitken iterative method.The order is then decreased with polynomial synthesis division.Finally the fourth-order equation is solved using the Ferrari's solution.Theoretical analysis and experiments on TMS320C5510 DSP show that the proposed algorithm has high precision and low computation complexity,meeting the real-time processing requirement.The algorithm can be applied to low-bit real-time speech coding such as G.729A systems.