A robust backward adaptive quantizer

This paper describes an adaptive encoder/decoder for efficient quantization of nonstationary signals. The system uses a robust backward adaptive encoding method such that the adaptation of the encoder and decoder is only determined by the transmitted codeword and does not require any additional side information. By incorporating a forgetting parameter, the quantizer is also robust to transmission errors and encoder/decoder mismatches. It is envisioned that practical applications of this algorithm can be used in the design of adaptive codecs (A/D and D/A converters) or as an efficient source coding algorithm for transmission of digitized speech