Periodic speech coding

The invention claims a quasiperiodic voice signal control method and device. The voice signal by using linear prediction coding analysis filter is the surplus signal representatives of the voice signal generating filter. An current fixedly connected with surplus signal current frame, to further surplus signal encodings. Data the first group of parameter, how the group of parameter to claims revise to make the preceding fixedly connected to the updating the preceding prototype close to with the current prototype. And one or more code vectors from the first code layer, the code vector and slot of the current prototype with the updating the differential of preceding prototype, wherein the code vector to describe and second group of parameter. According to the first and second group of parameter of current prototypes. A current of prototype and preceding of the area an surplus signal of the prototypes. According to the interpolation the surplus comprehensive signal output voice signal.