Speech coding.

摘要

Input speech is processed to derive (2) LPC filter parameters and (5) parameters of a multipulse excitation which are quantised (10) prior to transmission along with the filter parameters to a decoder where the excitation is generated and drives an LPC filter to produce resynthesised speech. Prior to the quantisation the pulse amplitudes are multiplied by factors (fi) which depend only on their position in the sequence in which the pulses are derived.