<P>PROBLEM TO BE SOLVED: To provide a method or a device for expressing speech which promotes efficient encoding and decoding from a low rate to middle rate. <P>SOLUTION: The device comprises: a speech encoder which divides a speech signal into frames, calculating parameters of a fundamental frequency ωO, voiced/unvoiced decision Vk, and spectrum intensity M1, quantizing and encoding the calculated parameters, and outputting them as a bit stream; and a speech decoder which decodes the bit stream from the speech encoder to reconstruct the parameters ωO, Vk, and M1, deciding voiced/unvoiced frequency bands from these parameters, regenerating a spectral phase, combining the voiced components and the unvoiced components respectively, and synthesizing the combined voiced components and the unvoiced components, to synthesize the speech. <P>COPYRIGHT: (C)2008,JPO&INPIT 
SYNTHESIS OF SPEECH USING REGENERATED PHASE INFORMATION