(Extremely) Simplified Model of Speech Production

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Presentation transcript:

(Extremely) Simplified Model of Speech Production Periodic source voiced Filters Coupling Speech unvoiced Noise source

Channel Vocoder, Synthesizer component

Channel Vocoder, Analyzer component

Vocoders: vocal tract synthesis Short time spectral synthesis Linear predictive synthesis Cepstral synthesis Formant synthesis

Vocoders: vocal tract analysis Short time spectral analysis Linear predictive analysis Cepstral analysis Formant analysis

Vocoders: vocal source analysis Pitch detection Voiced/unvoiced decision

Fine structure and Spectral Envelope

Narrow and wideband filterbank spectral analyses

Wideband spectrogram

Figure 3.5: Narrow band spectrogram

Source-Filter Separation by Cepstral Analysis

LPC spectral envelope estimation

Formant Analysis Peak picking from smoothed spectrum Root-finding from LPC polynomial - finding second-order sections In general, position more important than bandwidth Deterministic or statistical analysis to find best formant “track”

Ed Lee Vocoder Page http://ptolemy.eecs.berkeley.edu/~eal/audio/vocoder.html

Linux Vocoder Page http://www.sirlab.de/linux/descr_vocoder.html

How does the speech sound with the middle spectrum differ from the left one? From the right?

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