SPEECH PARAMETER CODING AND DECODING METHODS, CODER AND DECODER, AND PROGRAMS, AND SPEECH CODING AND DECODING METHODS, CODER AND DECODER, AND PROGRAMS

摘要

In coding and decoding an acoustic parameter, a weighted vector is generated by multiplying a code vector output in a past frame and a code vector select ed in a present frame by weighting factors respectively selected from a factor code book and adding the products to each other.