Ultra Low Bit Rate Speech Coding

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Ultra Low Bit Rate Speech Coding

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Author : V. Ramasubramanian
language : en
Publisher: Springer
Release Date : 2014-10-24

Ultra Low Bit Rate Speech Coding written by V. Ramasubramanian and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-10-24 with Technology & Engineering categories.

"Ultra Low Bit-Rate Speech Coding" focuses on the specialized topic of speech coding at very low bit-rates of 1 Kbits/sec and less, particularly at the lower ends of this range, down to 100 bps. The authors set forth the fundamental results and trends that form the basis for such ultra low bit-rates to be viable and provide a comprehensive overview of various techniques and systems in literature to date, with particular attention to their work in the paradigm of unit-selection based segment quantization. The book is for research students, academic faculty and researchers, and industry practitioners in the areas of speech processing and speech coding.

A Framework For Low Bit Rate Speech Coding In Noisy Environment

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Author : Venkatesh Krishnan
language : en
Publisher:
Release Date : 2005

A Framework For Low Bit Rate Speech Coding In Noisy Environment written by Venkatesh Krishnan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Acoustical engineering categories.

State of the art model based coders offer a perceptually acceptable reconstructed speech quality at bit-rates as low as 2000 bits per second. However, the performance of these coders rapidly deteriorates below this rate, primarily since very few bits are available to encode the model parameters with high fidelity. This thesis aims to meet the challenge of designing speech coders that operate at lower bit-rates while reconstructing the speech at the receiver at the same or even better quality than state of the art low bit-rate speech coders. In one of the contributions, we develop a plethora of techniques for efficient coding of the parameters obtained by the MELP algorithm, under the assumption that the classification of the frames of the MELP coder is available. Also, a simple and elegant procedure called dynamic codebook reordering is presented for use in the encoders and decoders of a vector quantization system that effectively exploits the correlation between vectors of parameters obtained from consecutiv speech frames without introducing any delay, distortion or suboptimality. The potential of this technique in significantly reducing the bit-rates of speech coders is illustrated. Additionally, the thesis also attempts to address the issues of designing such very low bit-rate speech coders so that they are robust to environmental noise. To impart robustness, a speech enhancement framework employing Kalman filters is presented. Kalman filters designed for speech enhancement in the presence of noise assume an autoregressive model for the speech signal. We improve the performance of Kalman filters in speech enhancement by constraining the parameters of the autoregressive model to belong to a codebook trained on clean speech. We then extend this formulation to the design of a novel framework, called the multiple input Kalman filter, that optimally combines the outputs from several speech enhancement systems. Since the low bit-rate speech coders compress the parameters significantly, it is very important to protect the transmitted information from errors in the communication channel. In this thesis, a novel channel-optimized multi-stage vector quantization codec is presented, in which the stage codebooks are jointly designed.

Digital Speech

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Author : A. M. Kondoz
language : en
Publisher: John Wiley & Sons
Release Date : 2005-06-14

Digital Speech written by A. M. Kondoz and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-06-14 with Technology & Engineering categories.

Building on the success of the first edition Digital Speech offers extensive new, updated and revised material based upon the latest research. This Second Edition continues to provide the fundamental technical background required for low bit rate speech coding and the hottest developments in digital speech coding techniques that are applicable to evolving communication systems. Features new chapters on Pitch Estimation and Voice-Unvoiced Classification of Speech, Harmonic Speech Coding and Multimode Speech Coding Presents a comprehensively revised chapter entitled Analysis by Synthesis LPC Coding including specific examples of popular speech coders such as CELP (Code-Excited Linear Predictive) Coding Contains an updated chapter on Efficient LPC Quantization Methods including MSVQ and anti-aliasing filtering Discusses Voice Activity Detection (VAD) methods Offers expanded coverage of speech enhancement techniques such as echo cancellation and noise suppression Written by a well-known, highly respected academic, this authoritative volume will be invaluable to practising engineers, network designers, computer scientists and advanced students in communications, electrical and electronic engineering.

1997 Ieee Workshop On Speech Coding For Telecommunications Proceedings

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Author :
language : en
Publisher: Institute of Electrical & Electronics Engineers(IEEE)
Release Date : 1997

1997 Ieee Workshop On Speech Coding For Telecommunications Proceedings written by and has been published by Institute of Electrical & Electronics Engineers(IEEE) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Computers categories.

Speech Coding At Very Low Bit Rates

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Author : T. Martin
language : en
Publisher:
Release Date : 1998

Speech Coding At Very Low Bit Rates written by T. Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Speech processing systems categories.

Ieee Workshop On Signal Processing Systems

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Author :
language : en
Publisher:
Release Date : 1998

Ieee Workshop On Signal Processing Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Integrated circuits categories.

Speech Coding And Synthesis

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Author : W. Bastiaan Kleijn
language : en
Publisher: Elsevier Science & Technology
Release Date : 1995

Speech Coding And Synthesis written by W. Bastiaan Kleijn and has been published by Elsevier Science & Technology this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Computers categories.

Hardbound. The fields of speech coding and synthesis have developed rapidly over the last decade. Text-to-text speech systems now produce reasonable quality speech, and currently available speech coders can transmit good quality speech at below 10kb/s. This, in combination with the ever-increasing speed of microprocessors and signal processing hardware, has resulted in a large number of practical applications. These applications in turn have stimulated research, and the number of papers published on speech coding and synthesis have proliferated rapidly. Reflecting periodically on such developments have inspired the publication of this book. Topics such as the effect of cross channel errors on coded speech and the determination of a proper pitch contour for synthesized speech are included.Both readers unfamiliar with the fields of speech coding and speech synthesis as well as those already working within the areas, will find the book of interest.

Very Low Bit Rate Speech Coding Using Vector Prediction Vol 2 Of 2 University Of Cambridge Mphil Dissertation August 1994

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Author : Zolfaghari P.S.
language : en
Publisher:
Release Date : 1994

Very Low Bit Rate Speech Coding Using Vector Prediction Vol 2 Of 2 University Of Cambridge Mphil Dissertation August 1994 written by Zolfaghari P.S. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Jprs Report

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Author :
language : en
Publisher:
Release Date : 1995-04

Jprs Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-04 with Science categories.

Science Abstracts

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Author :
language : en
Publisher:
Release Date : 1995

Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Electrical engineering categories.