Speech compression
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SPEECH COMPRESSION PowerPoint PPT Presentation


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SPEECH COMPRESSION. PCM. Sample Rate Nyquist Critria Bandwidth Limitation Sample Size Quantization Levels Quantization Noise / Distortion. Lossey Lossless. Source Independent Source Dependent. Compression. Voice Coding (Compression). Waveform Frequency Domain Vocoder.

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SPEECH COMPRESSION

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Speech compression

SPEECH COMPRESSION


Speech compression

PCM

  • Sample Rate

    • Nyquist Critria

    • Bandwidth Limitation

  • Sample Size

    • Quantization Levels

    • Quantization Noise / Distortion


Compression

Lossey

Lossless

Source Independent

Source Dependent

Compression


Voice coding compression

Voice Coding(Compression)

  • Waveform

  • Frequency Domain

  • Vocoder


Waveform coding

Waveform Coding

  • DSI - Digital Speech Interpolation

  • mLaw / A Law

  • Differential PCM

    • ADPCM – Adaptive Differential PCM

  • Delta Modulation

    • CVSD – Continuously Variable Slope Detector


Frequency domain

Frequency Domain

  • SBC – Sub Band Coding


Vocoder

Vocoder

  • LPC – Linear Predictive Coding

    • CELP – Code Excited Linear Prediction

    • VSELP – Vector Sum Excited Linear Prediction


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