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On encoding pitch and LPC parameters for low-rate speech coders

This paper describes the development of efficient methods to encode the parameters of long-term (pitch) and short-term (LPC all-pole) prediction filters with a limited bit-rate, such that the design of high quality speech coders in the 3–4 kbit/s range becomes easier. Our results indicate that good performance can be reached with about 800 bit/s to represent both the pitch lags and the coefficients of a three-tap pitch filter, thus achieving a significant 36% bit-rate reduction in comparison with conventional quantization techniques, and using 24 bit/frame to encode spectral parameters relative to a multilanguage speech database.