Embedded Speech Synthesis And Research And Achievement For Its Key Algorithm

With the development of science and technology, speech synthesis and have been already used in all the fields of society, and have become one of hot-researching fields in human-intelligence,speech signal processing and human-machine multi-medium interaction. Embedded TTS system is an important branch of the application of speech synthesis technique. Facing two features of embedded field:The limitation of hardware resource and the diversity of platform, how to implement a high quality embedded TTS system is a most important and difficult problem for speech synthesis technique to be applied in embedded field.This paper is research the methods of Chinese speech synthesis and its algorithm based on Chinese prosodic knowledge and modern speech processing technology. The main research work is following to according to Chinese acoustic characteristics and prosodic feature such as Chinese acoustic tones and characteristics, Chinese sentence tones and models etc. The author analyzes and researches the relations between prosodic features (pitch frequency, time length and magnitude), stress and break as well as prosodic boundary, proposing the rules of prosodic control for Chinese speech synthesis. Analyzing and comparing about prosodic feature and structure of prosodic levels,the author has finished the acoustic analysis of prosodic feature and prosodic boundary. It describes thoughts of constructing models based on prosodic levels, Predicting prosodic boundary and prosodic levels control. Determining syllable as the concatenated units and using statistical models based data-driven plus models based on rules, Chinese prosodic model has been constituted for better prosodic control. Using PSOLA algorithm, optimize this aim at embed system. The time length and pitch frequency of the concatenated units are adjusted only to certain scales, which influences the syntheses speech quality. At the same time,the synthesis by means of sentence tones and their prosodic control algorithm has researched in this Paper. Make it can be use in the ARM.Using above algorithms and methods the experiment of Chinese TTS has been accomplished. The experimental results show Chinese TTS and its prosodic control algorithm to be available.