The influence of pitch accuracy on synthetic speech quality

Lots of papers indicate that detecting pitch period accurately is extremely important in speech compression coding, without putting forward enough argumentation. In this paper, we conduct abundant experiments to observe the particular influence of pitch accuracy on synthetic speech quality. In two typical types of speech compression coding, we add “white” and “babble” noise signal respectively with different SNRs, to see the changes of pitch detection results and the corresponding synthetic speech quality. Later, we conduct some replacement operations between detection results and between different coding schemes to find the difference. We give ideas that the performance of pitch detection methods are closely related to speech characteristics and the environmental noise, while pitch period plays roles of different importance in hybrid coding and parameter coding.