Analysis & Synthesis The Vocoder and its related

Analysis & Synthesis The Vocoder and its related

Analysis & Synthesis The Vocoder and its related technology (Extremely) Simplified Model of

Speech Production Periodic source Noise source

voiced unvoiced Filters

Coupling Speech (Slightly less) Simplified Model of Speech Production

pitch Impulse Gain v Gain u

train Glottal model x x

Noise source V/uv bit Filter spec voiced

Filters unvoiced Coupling Speech

Glottal Waveform Caricature Glottis open (nonlinear)

Glottis closed (decoupled) 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 Narrowband

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.ht

ml

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