Multi-Band Excitation Vocoder.
MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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The problem of analyzing and synthesizing speech has a large number of applications, and as a result has received considerable attention in the literature. One class of speech analysissynthesis systems vocoders which have been extensively studied and used in practice are based on an underlying model of speech. For this class of vocoders, speech is analyzed by first segmenting speech using a window such as a Hamming window. Then, for each segment of speech the excitation parameters and system parameters are determined. The excitation parameters consist of the voicedunvoiced decision and the pitch period. The system parameters consists of the spectral envelope or the impulse response of the system. In order to synthesize speech, the excitation parameters are used to synthesize an excitation signal consisting of a periodic impulse train in voiced regions or random noise in unvoiced regions. This excitation signal is then filtered using the estimated system parameters.
- Voice Communications