Wideband speech coder and decoder that band divides an input speech signal and performs analysis on the band-divided speech signal

摘要

An LPC analyzer calculates LPC coefficients from a speech signal input from an input terminal through LPC analysis of the speech signal. An LPC coder codes the LPC coefficients. An impulse response circuit calculates an impulse response from the LPC coefficients obtained by the decoding. A first band divider divides the band of the impulse response. LPC analyzers calculate LPC coefficients for each subband. A second band divider divides the band of the input speech signal input from the input terminal and produces a speech signal for each subband. Coders code an excitation signal for each respective subband by using the LPC coefficients of the respective subband and the speech signal of the respective subband. A multiplexer outputs each code as a modulation signal.