LSP calculation methods for application to speech coding

Line spectrum pair (LSP) parameters are commonly used in speech coding for quantization of the speech spectral envelope. Unfortunately, the high computational complexity in the calculation of the LSP is a drawback for both real-time implementation and application in low-power portable devices. In this paper, some techniques for reducing computational complexity of the LSP calculation are given. The use of these techniques results in three novel LSP calculation algorithms which are explained and evaluated from the point of view of accuracy and computational complexity.