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Advanced Channel Vocoder: Speech Analysis and Synthesis

Explore the intricate workings of the Channel Vocoder for precise speech analysis and synthesis. Utilizing bandpass filters, FIR filters, rectifiers, and more, this system includes voicing and pitch detectors for accurate spectral measurements.

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Advanced Channel Vocoder: Speech Analysis and Synthesis

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  1. Vocoders

  2. The Channel Vocoder (analyzer): • The channel vocoder employs a bank of bandpass filters, • Each having a bandwidth between 100 HZ and 300 HZ. • Typically, 16-20 linear phase FIR filter are used. • The output of each filter is rectified and lowpass filtered. • The bandwidth of the lowpass filter is selected to match the time variations in the characteristics of the vocal tract. • For measurement of the spectral magnitudes, a voicing detector and a pitch estimator are included in the speech analysis.

  3. Encoder Bandpass Filter Rectifier Lowpass Filter A/D Converter Bandpass Filter Rectifier Lowpass Filter A/D Converter To Channel S(n) Voicing detector Pitch detector The Channel Vocoder (analyzer block diagram):

  4. The Channel Vocoder (synthesizer): • At the receiver the signal samples are passed through D/A converters. • The outputs of the D/As are multiplied by the voiced or unvoiced signal sources. • The resulting signal are passed through bandpass filters. • The outputs of the bandpass filters are summed to form the synthesized speech signal.

  5. The Channel Vocoder (synthesizer block diagram): Decoder D/A Converter Bandpass Filter Output speech ∑ D/A Converter Bandpass Filter From Channel Voicing Information Switch Random Noise generator Pitch period Pulse generator

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