SPEECH CODING APPARATUS, SPEECH DECODING APPARATUS, SPEECH CODING AND DECODING METHOD AND A PHASE AMPLITUDE CHARACTERISTIC EXTRACTING APPARATUS FOR CARRYING OUT THE METHOD

摘要

A speech coding and decoding apparatus for improving thequality of synthesized speech. A coding portion includes afilter for adding a short-term phase amplitude characteristicto an excitation signal, and a coding circuit for quantizingand coding a phase amplitude characteristic. A decodingportion includes a decoding circuit for decoding the codedphase amplitude characteristic, and a filter for adding thesame phase amplitude characteristic as that in the codingportion. Thus, it is possible to synthesize high-qualityspeech with good reproducibility of the phase amplitudecharacteristic of an excitation signal.