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Multimode Spectral Coding of Speech at 2400 bps and Below

Multimode Spectral Coding of Speech at 2400 bps and Below

引用

IEEE Workshop on Speech Coding For Telecommunications

作者： A.M. Das A. Gersho Signal Compression Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

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Asymptotic closed-loop design of predictive multi-stage vector quantizers

Asymptotic closed-loop design of predictive multi-stage vect...

引用

IEEE International Conference on Image Processing

作者： H. Khalil K. Rose Signal Compression Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

This work considers the design of a multi-stage vector quantizer (MSVQ) for application to the motion compensated prediction error of video signals. It is well known that the design of predictive vector quantizers suffers from fundamental difficulties due to the prediction loop, which have an impact on the convergence and the stability of the design procedure. We propose an approach to predictive MSVQ design that enjoys the stability of open-loop design while ensuring ultimate optimization of the closed-loop system. The proposed design method is tested on video compression at low bit rates, where it significantly outperforms widely-used closed-loop design techniques, and achieves improvement over the H.263 standard.

关键词： Video compression Discrete cosine transforms Bit rate Image coding Laboratories Stability Mobile communication Statistics Video coding signal design

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A 16-kbit/s bandwidth scalable audio coder based on the G.729 standard

A 16-kbit/s bandwidth scalable audio coder based on the G.72...

引用

International Conference on Acoustics, Speech, and signal Processing (ICASSP)

作者： K. Koishida V. Cuperman A. Gersho Signal Compression Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

This paper proposes a bandwidth-scalable coding scheme based on the G.729 standard as a base layer coder. In the scheme, according to the channel conditions, the output speech of the decoder can be selected to be narrowband (4-kHz bandwidth) or wideband (8-kHz bandwidth). The proposed scheme consists of two layers: base and enhancement. The base coder uses the G.729 algorithm to encode narrowband speech. The enhancement coder is based on a full-band CELP model and it encodes wideband speech while making use of the available base layer information. Two bandwidth-scalable coders are designed: one is scalable with the 8 kbit/s G.729 base coder and another with the 6.4 kbit/s G.729 (Annex D) base coder. Subjective tests show that, for wideband speech, the proposed coders at 16 kbit/s achieve better performance than the 16 kbit/s MPEG-4 CELP with bandwidth scalability.

关键词： Bandwidth Code standards Narrowband Wideband Scalability Decoding Speech enhancement Laboratories MPEG 4 Standard Speech analysis

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Multi-stage vector quantizer design for image transmission over packet networks

Multi-stage vector quantizer design for image transmission o...

引用

IEEE International Conference on Image Processing

作者： H. Khalil K. Rose Signal Compression Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

ISBN: (纸本)0780362977

The design of a source-channel system based on the multi-stage vector quantizer (MSVQ) is optimized for packet networks. Resilience to packet loss is further enhanced by a proposed interleaving scheme that ensures that a single lost packet only eliminates a subset of the vector stages. The design is optimized while taking into account compression efficiency, packet loss rate, and the interleaving technique in use. Simulation results demonstrate that the packet network-optimized MSVQ outperforms traditional MSVQ for a variety of images and channel conditions, with gains of up to 2.0 dB in PSNR. Although the formulation is given in the context of packet networks, the work is directly extendible to the broader category of erasure channels.

关键词： Image communication Decoding Robustness Design optimization Interleaved codes Image coding Laboratories signal design Resilience PSNR

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A Probabilistic Approach to Classification of Transients in Power Systems

A Probabilistic Approach to Classification of Transients in ...

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： L. S. Safavian W. Kinsner H. Turanli Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg MAN Canada Manitoba Hydro Winnipeg MAN Canada

This paper presents an in-depth study of classification of transients in power systems using two pattern classification methods, namely the maximum-likelihood, and the probabilistic neural networks. These methods, which stem from the Bayes rule, aim at estimating the underlying probability density functions that are required by the Bayes rule, but are often unavailable readily. The paper presents the mathematical foundations of classification using these two methods, followed by their implementation for classification of three types of transients, namely three-phase faults, breaker operations and capacitor switchings. Features used in this study are obtained using the wavelet and multifractal analyses of transient waveforms

关键词： Power system transients Transient analysis Wavelet analysis Fractals Power system faults Pattern classification Maximum likelihood estimation PSCAD signal processing Neural networks

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Hadamard-Craigen error correcting codes

Hadamard-Craigen error correcting codes

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： R. Craigen N. Gadhok S. Silverman W. Kinsner Department of Mathematics Department of Electrical and Computer Engineering University of Manitoba Winnipeg MAN Canada Department of Mathematics and Signal and Data Compression Laboratory Department of Electrical and Computer Engineering University of Manitoba Winnipeg MAN Canada

This paper presents a block coding scheme based on a new construction of block-circulant Hadamard matrices. We describe this unified construction of Hadamard matrices of order 2/sup t/p where p is any odd number and t/spl ges/4 (depends on p), explaining how the block-circulant structure of the matrices contributes to more efficient coding. We introduce HC codes that can be implemented in software with relatively short encoding and decoding times. An HC matrix is compact in that it can be represented in its entirety by its first 2/sup t-1/ rows. Experiments show that the HC(64,7,32) code is better than the BCH(63,7,31) code by 1.5 dB and 2.8 dB over the corresponding uncoded data at SNR of 3 dB.

关键词： Error correction codes Error correction Autocorrelation data compression Laboratories Block codes Decoding Protection Channel coding Bit error rate

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Classification of transients in power systems using multifractal analysis

Classification of transients in power systems using multifra...

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： L.S. Safavian W. Kinsner H. Turanli Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg MAN Canada Manitoba Hydro Winnipeg MAN Canada

This paper presents a study of a method for feature extraction and classification of voltage disturbances based on multifractal analysis of a voltage waveform with a transient. In this work, the variance fractal dimension trajectory is used to characterize a transient and to extract its features. The features extracted are a trajectory of fractal dimensions that are calculated over a number of overlapping windows along the transient signal. Based on their extracted features, classification of the transients is carried out using a statistical maximum likelihood classifier, which discriminates between three classes of voltage disturbances such as faults, breaker operations and capacitor switchings. The performance of the classifier is considered with both raw signals and also signals contaminated by noise.

关键词： Power system transients Transient analysis Power system analysis computing Fractals Feature extraction Voltage signal analysis Capacitors Power system faults Frequency

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High quality enhanced waveform interpolative coding at 2.8 kbps

High quality enhanced waveform interpolative coding at 2.8 k...

引用

International Conference on Acoustics, Speech, and signal Processing (ICASSP)

作者： O. Gottesman A. Gersho Signal Compression Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

This paper presents a high quality enhanced waveform interpolative (EWI) speech coder at 2.8 kbps. The system incorporates novel features such as: dual-predictive analysis-by-synthesis (AbS) quantization of the slowly evolving waveform (SEW), efficient parametrization of the rapidly evolving waveform (REW) magnitude, and AbS vector quantization (VQ) of the REW parameter. Subjective tests indicate that its quality exceeds that of G.723.1 at 5.3 kbps, and it is slightly better than that of G.723.1 at 6.3 kbps.

关键词： Bit rate Laboratories Speech coding Vector quantization Low earth orbit satellites Parameter estimation Electronic mail Speech enhancement Speech synthesis Testing

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Robust predictive vector quantizer design

Robust predictive vector quantizer design

引用

data compression Conference (DCC)

作者： H. Khalil K. Rose Signal Compression Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

ISBN: (纸本)0769510310

The design of predictive quantizers generally suffers from difficulties due to the prediction loop, which have an impact on the convergence and the stability of the design procedure. We previously proposed an asymptotically closed-loop approach to quantizer design for predictive coding applications, which benefits from the stability of open-loop design while asymptotically optimizing the actual closed-loop system. In this paper, we present an enhancement to the approach where joint optimization of both predictor and quantizer is performed within the asymptotically closed-loop framework. The proposed design method is tested on synthetic sources (first-order Gauss and Laplacian-Markov sequences), and on natural sources, in particular, line spectral frequency parameters of speech signals.

关键词： Robustness Convergence Predictive coding Asymptotic stability Design optimization Design methodology Testing Gaussian processes Frequency Speech

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Enhanced waveform interpolative coding at 4 kbps

Enhanced waveform interpolative coding at 4 kbps

引用

IEEE Workshop on Speech Coding Proceedings

作者： O. Gottesman A. Gersho Signal Compression Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

This paper presents an enhanced waveform interpolative (EWI) speech coder at 4 kbps. The system incorporates novel features such as analysis-by-synthesis (AbS) vector-quantization (VQ) of the dispersion-phase, AbS optimization of the slowly evolving waveform (SEW), a special pitch search for transitions, and switched-predictive analysis-by-synthesis gain VQ. Subjective quality tests indicate that it exceeds that of MPEG-4 at 4 kbps and of G.723.1 at 5.3 kbps, and it is slightly better than that of G.723.1 at 6.3 kbps.

关键词： Laboratories Speech enhancement Low pass filters Parameter estimation Quantization Electronic mail System testing MPEG 4 Standard Degradation Robustness

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