A Practical Handbook of Speech Coders

ISBN-13: 9780849385254 / Angielski / Twarda / 2000 / 256 str.

Randy Goldberg; Lance Riek

Opis

The demand for digital speech coding algorithms grows every day, fueled by applications such as streaming speech over the Internet, Internet telephone, digital cellular telephony, wireless teleconferencing, and various multimedia applications. Until now, most of the books available on audio coding have been collections of individually authored papers. Others have discussed the fundamental coders, but neglected many of the innovations currently in use. Unlike these books, A Practical Handbook of Speech Coders offers in-depth treatment of the basics of speech coding plus the innovations to the basic methods that make the coders useful and efficient.
The authors designed this work for engineers, scientists, and manager who need to understand the emerging speech coding techniques and telecommunication standards. However, it will prove useful to people at all levels of speech coder experience:

If you want to simply download the code for an existing algorithm, this book helps you evaluate the strengths and weaknesses of all publicly available codes and choose the right one, then points you to the Internet location where the code is available for download.

For experts who want to improve on existing coders, this book provides the parameters of current coders and the techniques to improve upon them. You can download an existing algorithm or code it using the algorithmic descriptions in the book, make your innovations, and then test the code with the procedures given.

If you want to become an expert and have some basic knowledge of digital signal processing, you can learn the innovative steps taken by the inventor of each coder, explore the rigorous research techniques needed to develop your own coder, and become proficient in existing vocoder technology.

Spis treści

INTRODUCTION
SPEECH PRODUCTION
The Speech Chain
Articulation
Source-Filter Model
SPEECH ANALYSIS TECHNIQUES
Sampling and the Speech Waveform
Systems and Filtering
z Transform
Fourier Transform
Discrete Fourier Transform
Windowing Signal Segments
LINEAR PREDICTION VOCAL TRACT MODELING
Sound Propagation in the Vocal Tract
Estimation of LP Parameters
Transformations of LP Parameters for Quantization
Examples of LP Modeling
PITCH EXTRACTION
Autocorrelation Pitch Extraction
Cepstral Pitch Extraction
Frequency-Domain Error Minimization
Pitch Tracking
AUDITORY INFORMATION PROCESSING
The Basilar Membrane: A Spectrum Analyzer
Critical Bands
Thresholds of Audibility and Detectability
Monaural Masking
QUANTIZATION AND WAVEFORM CODERS
Uniform Quantization
Nonlinear Quantization
Adaptive Quantization
Vector Quantization
QUALITY EVALUATION
Objective Measures
Subjective Measures
Perceptual Objective Measures
VOICE CODING CONCEPTS
Channel Vocoder
Formant Vocoders
The Sinusoidal Speech Coder
Linear Prediction Vocoder
LINEAR PREDICTION ANALYSIS BY SYNTHESIS
Analysis by Synthesis Estimation of Excitation
Multi-Pulse Linear Prediction Coder
Regular Pulse Excited LP Coder
Code Excited Linear Prediction Coder
MIXED EXCITATION CODING
Multi-Band Excitation Vocoder
Mixed Excitation Linear Prediction Coder
Split Band LPC Coder
Harmonic Vector Excitation Coder
Waveform Interpolation Coding
PERCEPTUAL SPEECH CODING
Auditory Processing of Speech
Perceptual Coding Considerations
Research in Perceptual Speech Coding
APPENDIX: RELATED INTERNET SITES

O autorze

Goldberg\, Randy; Riek\, Lance