Advances in Speech Coding

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Springer Science & Business Media, 1991 - Technology & Engineering - 378 pages
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Speech coding has been an ongoing area of research for several decades, yet the level of activity and interest in this area has expanded dramatically in the last several years. Important advances in algorithmic techniques for speech coding have recently emerged and excellent progress has been achieved in producing high quality speech at bit rates as low as 4.8 kb/s. Although the complexity of the newer more sophisticated algorithms greatly exceeds that of older methods (such as ADPCM), today's powerful programmable signal processor chips allow rapid technology transfer from research to product development and permit many new cost-effective applications of speech coding. In particular, low bit rate voice technology is converging with the needs of the rapidly evolving digital telecom munication networks. The IEEE Workshop on Speech Coding for Telecommunications was held in Vancouver, British Columbia, Canada, from September 5 to 8, 1989. The objective of the workshop was to provide a forum for discussion of recent developments and future directions in speech coding. The workshop attracted over 130 researchers from several countries and its technical program included 51 papers.
 

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Contents

1 Backward Adaptive Prediction Algorithms in MultiTree Speech Coders
5
2 Backward Adaptive Configurations for LowDelay Vector Excitation Coding
13
3 A Robust LowDensity CELP Speech Coder at 16 kbs
25
4 An Efficient VariableBitRate LowDelay CELP VBRLDCELP Coder
37
5 A TrellisSearched 16 kbitsec Speech Coder with LowDelay
47
6 Hybrid Backward Adaptive Pitch Prediction for LowDelay Vector Excitation Coding
57
Speech Coding for Digital Cellular and Portable Communications
67
7 Vector Sum Excited Linear Prediction VSELP
69
19 SineWave Amplitude Coding at Low Data Rats
203
20 The MultiBand Excitation Speech Coder
215
21 Phonetic Segmentation for Low Rate Speech Coding
225
22 Vector Excitation Homomorphic Vocoder
235
23 A 400BPS Speech Coding Algorithm for RealTime Implementation
245
Speech Coding for Noisy Channels and RealTime Implementations
255
24 SourceDependent Channel Coding and its Application to CELP
257
25 Vector Trellis Quantization for Noisy Channels
267

8 An Error Protected Transform Coder for Cellular Mobile Radio
81
9 A Multipulse Speech Codec for Digital Cellular Mobile Use
87
10 Transmitting Digital Speech in a Portable Radio Environment
97
11 A Study on Speech and Channel Coding for Digital Cellular
109
Speech Coding Below 8 KBS Using Code Excited Linear Prediction
119
12 The DOD 48 KBPS Standard Proposed Federal Standard 1016
121
13 AnalysisBySynthesis Linear Predictive Speech Coding at 48 kbits and Below
135
A Novel Approach to Low Complexity CELP Coding
145
15 Speech Coding with Dynamic Bit Allocation Multimode Coding
157
16 7 KBPS 7 MIPS High Quality ACELP for Cellular Radio
167
17 A 6 KBPS Regular Pulse CELP Coder for Mobile Radio Communications
179
ALTERNATIVE TECHNIQUES FOR LOW RATE SPEECH CODING
189
18 Beyond Multipulse and CELP Towards High Quality Speech at 4 kbs
191
26 Application of Stochastic Coding Schemes in Satellite Communication
277
27 A Real Time Implementation of a 4800 bps Self Excited Vocoder
287
28 A RealTime Full Duplex 168 KBPS CVSELP Coder with Integral Echo Canceller Implemented on a Single DSP56001
299
TOPICS IN SPEECH CODING
309
29 Improved Excitation Sequence Quantization in Regular Pulse Excitation Speech Coding
311
30 On Improving the Performance of Pitch Predictors in Speech Coding Systems
321
31 Efficient Encoding of the LongTerm Predictor in Vector Excitation Coders
329
32 ConstrainedStochastic Excitation Coding of Speech at 48 kbs
339
33 Speech Coding Using LeastSquares Estimation
349
34 Qualitative Analysis and Enhancement of Sine Transform Coding
359
35 An ADM Speech Coding with Time Domain Harmonic Scaling
367
Index
375
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