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

作者： J. Deller T. Luk Digital Signal Processing Laboratory: Speech Processing Sector Department of Electrical and Computer Engineering Northeastern University Boston MA USA Baldwin Technologies Corporation Country Side IL USA

The theory of set membership (SM) identification is formulated, and applied to linear prediction (LP) analysis of speech. The LP parameters of a simulated vowel are identified as an illustration. The SM strategy resul... 详细信息

关键词： Speech analysis Samarium Speech processing Least squares methods Covariance matrix Vectors Equations Recursive estimation Digital signal processing Laboratories

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An analysis of sinusoidally excited delta-sigma modulators

An analysis of sinusoidally excited delta-sigma modulators

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

作者： S. Ardalan J. Paulos Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

This paper introduces a new method of analysis for Delta-Sigma Modulators based on modeling the nonlinear quantizer with a linerized gain, obtained by minimizing a mean-square-error criterion[7], followed by an additive noise source representing distortion components. In the paper, input-signal amplitude dependencies of Delta-Sigma Modulator stability and signal to noise ratio are analyzed. It is shown that due to the nonlinearity of the quantizer, the signal-to-noise ratio of the modulator may decrease as the input amplitude increases prior to saturation. Also, a stable third-order Delta-Sigma Modulator may become unstable by increasing the input amplitude beyond a certain threshold. Both of these phenomenon are explained by the nonlinear analysis of this paper. The analysis is carried out sinusoidal excitations.

关键词： Delta modulation signal to noise ratio Additive noise Amplitude modulation signal analysis Noise level Distortion Delta-sigma modulation Quantization signal processing

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A second generation image coding technique using human visual system based segmentation

A second generation image coding technique using human visua...

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

作者： S. Rajala M. Civanlar Wonrae Lee Department of Electrical and Computer Engineering Center for Communications and Signal Processing North Carolina State University Raleigh NC USA

A new segmentation method based on the properties of the human visual system is described in this paper. The segmentation method is part of a new second generation image coder. In addition, one of the properties is that it is not necessary to transmit (or store) the visual residual for use in reconstructing the received signal. It is assumed that the characteristics of this visual residual are known at the receiver and can be used in the reconstruction process.

关键词： Image generation Image coding Humans Visual system Image segmentation Dynamic range Optical filters signal processing Image reconstruction Filtering

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An image coding technique using a human visual system model and image analysis criteria

An image coding technique using a human visual system model ...

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

作者： R. Nobakht S. Rajala Department of Electrical and Computer Engineering Center for Communications and Signal Processing North Carolina State University Raleigh NC USA

Recently, ways to obtain a new generation of image-coding techniques have been proposed. The incorporation of the human visual system (HVS) models and tools of the image analysis, such as segmentation, are two defining features of these techniques. In this paper, a new image coding technique is presented which utilizes a human visual system model and a image analysis criteria together with the technique of projection onto convex sets (POCS). The human visual system model is used to determine the most probable perceptual information of an image and the removal of irrelevant information. The projection onto convex sets operation is used as a restoration technique aimed at correcting the degradations caused by the conventional coders in the transmitter part of the channel. And finally, the image analysis based technique is used as an interpolator in order to predict the unknown regions of the received image. This new technique can be used in single frame image coding applications to obtain acceptable images at extremely high compression rates.

关键词： Image coding Humans Visual system Image analysis Optical transmitters Optical filters Optical receivers Nonlinear optics Optical modulation Bandwidth

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Recognition of Cerebral Palsy speech: Technical method and a study of vowel consistency

Recognition of Cerebral Palsy speech: Technical method and a...

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

作者： J. Deller D. Hsu L. Ferrier Digital Signal Processing Laboratory Speech Processing Sector Department of Electrical and Computer Engineering Northeastern University Boston MA USA Department of Speech and Language Pathology and Audiology Northeastern University Boston MA USA

A method for recognition of speech of the nonverbal is presented. Results of the application of the procedure to simple utterances by cerebral palsied individuals and implications for an overall communications device ... 详细信息

关键词： Speech recognition Birth disorders Artificial intelligence Speech processing Natural languages Loudspeakers Digital signal processing Laboratories Pathology Application software

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A knowledge-based message generation system for the nonverbal, profoundly motor disabled 87

A knowledge-based message generation system for the nonverba...

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Proceedings of the 1987 Fall Joint computer Conference on Exploring technology: today and tomorrow

作者： B.-K. Sy J. R. Deller, Jr. CDSP Laboratory: Speech Processing Sector Department of Electrical and Computer Engineering / 409 DA Northeastern University 360 Huntington Ave. Boston MA

ISBN: (纸本)9780818608117

Fundamental issues related to the design of an intelligent communication (speech or text) device for the nonverbal, profoundly motor disabled are discussed. The device is to assist a person in the generation of a message by suggesting message elements one-at-a-time, for yes/no response. A graph theoretic approach to represent contextual knowledge about a fixed language is proposed, and message generation is viewed as one of decentralized control of graph search. A strategy for integrating information from a speech recognition system is formalized. Its significance is to allow the user to attempt to speak the message. The search strategy is based on a parsing tree traversal technique which dynamically adjusts its message element presentations in accordance with contextual knowledge embedded in the graph, the information from speech recognition, and the user's responses to interrogation.

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RECURSIVE BLOCK CODING - A NEW APPROACH TO TRANSFORM CODING

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IEEE TRANSACTIONS ON COMMUNICATIONS 1986年第2期34卷 161-179页

作者： FARRELLE, PM JAIN, AK Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

The concept of fast KL transform coding introduced earlier [7], [8] for first-order Markov processes and certain random fields has been extended to higher order autoregressive (AR) sequences and practical images yielding what we call recursive block coding (RBC) algorithms. In general, the rate-distortion performance for these algorithms is significantly superior to that of the conventional block KL transform algorithm. Moreover, these algorithms permit the use of small size transforms, thereby removing the need for fast transforms and making the hardware implementation of such coders more appealing. This improved performance has been verified for practical image data and results in suppression of the block-boundary effect commonly observed in traditional transform coding techniques. This is illustrated by comparing RBC with cosine transform coding using both one- and twodimensional algorithms. Examples of RBC encoded images at various rates are given.

关键词： Transform coding Karhunen-Loeve transforms Block codes Data compression Image coding signal processing Image processing Bit rate Markov processes Rate-distortion

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ON THE SPECTRUM OF PSEUDO NOISE

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PROCEEDINGS OF THE IEEE 1986年第4期74卷 608-609页

作者： GARDNER, WA CHEN, CK Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

Although the magnitude of the discrete Fourier transform of a maximal-length shift-register sequence is flat, except for its value at zero frequency, the higher resolution spectral content given by the Fourier-series transform is highly erratic. This little-known fact is described, and its ramifications on fast Fourier transforms of one-digit-extended pseudo noise and zero-padded pseudo noise are explained.

关键词： Discrete Fourier transforms Autocorrelation Frequency Interpolation Fourier transforms White noise Fast Fourier transforms Prediction algorithms Fourier series signal processing

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THE ROLE OF SPECTRAL CORRELATION IN DESIGN AND PERFORMANCE ANALYSIS OF SYNCHRONIZERS

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IEEE TRANSACTIONS ON COMMUNICATIONS 1986年第11期34卷 1089-1095页

作者： GARDNER, WA Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

The popular class of synchronizers that consist of a quadratic nonlinearity followed by a phase-lock loop is investigated, and it is shown that the optimum design of the quadratic transformation is characterized in terms of a spectral correlation function for the signal to be synchronized to. It is also shown that the SNR performance of this quadratic transformation, and the mean-square phase jitter of the phaselock loop are both characterized in terms of spectral correlation functions. The conditions under which the optimum quadratic transformations, for symbol synchronization of BPSK, QPSK, SQPSK, and MSK, and for carrier synchronization of BPSK, reduce to the well-known matched-filter-squarer are identified. In addition, the well-known zeromean-square-phase-jitter condition is generalized from PAM to all synchronizable signals, and is characterized in terms of the spectral correlation function. The low-SNR maximum-likelihood synchronizer for all quadratically synchronizable signals is characterized in terms of a multiplicity of maximum-SNR quadratic spectral-line generators. A closed form implementation in terms of a matched filter, squarer, and symbol-rate-synchronized averager is obtained for BPSK and QPSK signals.

关键词： Performance analysis Frequency synchronization Binary phase shift keying Quadrature phase shift keying Timing Jitter signal generators Matched filters Oscillators Clocks

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THE RESIDENTIAL POWER CIRCUIT AS A COMMUNICATION MEDIUM

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 1986年第3期32卷 567-577页

作者： ONEAL, JB Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

This paper is a summary of work done to characterize the residential power circuit as a communication medium. Here the term residential power circuit refers to that part of the power circuit on the secondary side of the distribution transformer. This circuit is often used for communication signals for controlling appliances, security devices, and for other purposes. The frequencies of most interest in these systems range from about 100 to 200 kHz. The interface to this circuit is usually a 120 V or 240 V receptacle used to deliver power. These communication systems are called residential power line carrier systems. Other types of power line carrier are distribution line carrier and transmission line carrier both of which are used by the power utilities for communications purposes.

关键词： Circuits Impedance Frequency Wiring Home appliances Attenuation Capacitance signal processing Communication system control Communication system security

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