Multimode speech encoder

Claims a voice compression system it is able to the speech signal coding is used for carrying out decoding bit stream so as to generate a synthesized speech. Voice compression system through the to request average bit rate and reproduction audio perceiving quality of balance so as to make the bit stream and the consumption of bandwidth optimize. Voice compression system comprises a full rate coding and decoding machine half rate speed coding and decoding machine 1/4 rate coding and decoding device and 8 of a codec rate. According to rate selection selectively excitation codec 22 24 26*28 the outer according to type analysis selectively fully excitation and half rate speed coding and decoding machine 22*24. Selectively activating each coder/decoder 26*28 22 24 with different bit rate the sound signal encoding and decoding voice signal intensity adjusting different aspects of so as to improve the synthesized speech a total mass of.