t敎獬汤-Analysisamp;amp;Synthesis.pptVIP

Analysis Synthesis The Vocoder and its related technology (Extremely) Simplified Model of Speech Production (Slightly less) Simplified Model of Speech Production 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 Figure 3.5: Narrow band spectrogram Source-Filter Separation by Cepstral Analysis 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” * Periodic source Noise source Filters voiced unvoiced Coupling Speech Glottal model Noise source Filters voiced unvoiced Coupling Speech Impulse train x x Gain v Gain u pitch V/uv bit Filter spec Glottal Waveform Caricature Glottis open (nonlinear) Glottis closed (decoupled) Channel Vocoder, Synthesizer component Channel Vocoder, Analyzer component Fine structure and Spectral Envelope Narrow and wideband filterbank spectral analyses Wideband spectrogram Narrowband spectrogram LPC spectral envelope estimation *