公开(公告)号：US3564142A

公开(公告)日：1971-02-16

申请号：US3564142D

申请日：1968-07-30

Applicant: IBM

Inventor： ROTHAUSER ERNST H ,  BANDAT KURT F

IPC: G10L19/02 ,  H04B1/66

CPC classification number: H04B1/66 ,  G10L19/02

Abstract: The invention relates to a method of channel vocoder speech synthesis. For representing the speech signals for several independent speech lines, digital speech data stored in data processors are used. In addition, the method provides for the storage of the time-sampled digital description of the transient behaviors of n spectrum channel band-pass filters. Only one such description is needed for synthesizing the speech signals for m speech lines. For a given speech line the transient responses of the band-pass filters are modulated by the frequency function for the given line. The modulated transient values are added for corresponding time samples and stored in a delay line for the given speech line. The stored value of a speech line is released at points in time defined by the excitation function, thus releasing a digital description of the transient response of the set of band-pass filters as if they were excited by a unit pulse and modulated by the frequency function of the given speech line. The digital description is demodulated to an analogue form by conventional means.