| 摘要 |
PURPOSE:To obtain a synthetic speech which does not deteriorate in quality even if there is a transient part of a speech or a change part between vowels by dividing a frame of a sound source signal in a speech section into pitch cycles, and indicating a multipulse in a pitch section as one representative section and an amplitude correction coefficient and a phase correction coefficient in other sections. CONSTITUTION:A discrete speech signal is inputted to a transmission side and a spectrum parameter indicating a spectrum envelope and a pitch parameter indicating pitch are extracted by frames; and a frame section is divided into pitch sections corresponding to the pitch information and the sound source signal is outputted as a combination of the multipulse in one section and correction information regarding the multipulse. On a reception side, the signal is restored to a driving sound source signal and a speech synthetic signal is generated by using the spectrum parameter. Namely, a representative section for each frame is searched for in a voiced section to transmit the amplitude and position of the multipulse and amplitudes and phase correction coefficients of other pitch sections as sound source information and also send the spectrum and pitch parameter of a composing filter as auxiliary information. |
