  Quantization is an essential step in the analog-to-digital conversion process
and it is very important in all modern telecommunication systems. In this
paper, a novel chaotic uniform quantizer is proposed and its application for
speech coding is presented. The proposed system consists of three stages: two
PCM coders separated by an XOR operation with a chaotic sequence, where the
first step is used for continuous signal sampling and second stage performs
data encryption, while the third stage provides additional data compression.
The performance of the presented quantizer for Laplacian distributed signals
and real speech signals is investigated and compared with that of the
well-known uniform and non-uniform quantizers. Simulation results show that the
proposed quantizer provides secured data with higher levels of SQNR compared to
others.
