New Technique to Reduce Bit Rate of LPC-10 Speech Coder

There are different optimisation criteria in the design of speech compression algorithms and in development speech coding system. Linear predictive coder (LPC) parameters are widely used in a various speech coding method. Line spectrum pairs (LSP), as alternate representation of LPC presents some useful properties for quantisation and transmission. This work investigates and proposes an efficient new technique and parameters to reduce the bit rate while maintain the reconstruct speech as the original speech in the LPC-10 speech code. The new technique is based on the LSP parameters and vector quantisation technique. The results of this experiments show that this technique can reduce the bit rate by around 2-66% and also provides the excellent formant frequency similar to the original speech