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SWITCHED PREDICTOR ADAPTATION OF DPCM-AQB SPEECH codeR USING AN IMBEDDED VECTOR QUANTIZATION

ELECTRONICS LETTERS 1985年第10期21卷 442-444页

作者： RAMAMOORTHY, V Department of Electrical Engineering University of Linköping Linköping WS-58183 Sweden

An adaptive differential pulse-code-modulation speech coder with a switched predictor adaptation scheme is described. The predictor adaptation is done by switching one of the several predetermined predictors stored both at the encoder and the decoder. The selection of the predictor is controlled by a vector quantiser. The tradeoff between the performance and the extra side information that needs to be transmitted is evaluated for bit rates of 16, 24 and 32 Kbit/s.

关键词： filtering and prediction theory encoding side information Speech processing speech analysis and processing pulse-code modulation imbedded vector quantisation codes bit rates pulse code modulation switched predictor adaptation scheme speech coder adaptive differential pulse-code-modulation

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pulse-coded information transmission across an axially excited chiral-sculptured thin film in the Bragg regime

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第1期28卷 59-62页

作者： Geddes, JB Lekhtakia, A Penn State Univ Dept Engn Sci & Mech CATMAS University Pk PA 16802 USA

Although a monochromatic plane wave of a certain circular polarization state and wavelength may be almost completely reflected by a chiral sculptured thin film, we show here that information coded in rectangular pulses can still he transmitted across the film-provided the rise and fall rimes of the pulses are sufficiently small and the pulse widths are sufficiently large. (C) 2001 John Wiley & Sons, Inc.

关键词： chiral-sculptured thin films circular Bragg phenomenon pulse-code modulation

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ZERO REDUNDANCY CHANNEL CODING IN VECTOR QUANTIZATION

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ELECTRONICS LETTERS 1987年第12期23卷 654-656页

作者： ZEGER, KA GERSHO, A Department of Electrical & Computer Engineering University of California Santa Barbara USA

Gray-coding of signal amplitudes can protect PCM transmission of analogue signals from the effects of channel bit errors. We generalise this to VQ, and provide a `vector switching?? algorithm that reduces the expected... 详细信息

关键词： electric distortion code-book pulse-code modulation vector quantisation distortion reduction codes zero redundancy channel coding vector switching Other data transmission codes channel bit errors Gray-coding of signal amplitudes PCM transmission of analogue signals

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ADPCM USING VECTOR PREDICTOR AND FORWARD ADAPTIVE QUANTIZER WITH STEP-SIZE PREDICTION

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ELECTRONICS LETTERS 1985年第2期21卷 74-75页

作者： WONG, KHJ STEELE, R Department of Electronics & Information Engineering University of Southampton Southampton UK

An adaptive differential pulse code modulation (ADPCM) system is described having a set of fixed vector predictors, and a quantiser that is adapted in the forward direction with the distinction that its step size is p... 详细信息

关键词： step-size prediction forward adaptive quantiser fixed vector predictors encoding pulse-code modulation codes adaptive differential pulse code modulation SNR gains analogue-digital conversion

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COMPONENTS OF BIT-RATE VARIATION IN VIDEOCONFERENCE SIGNALS

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ELECTRONICS LETTERS 1989年第4期25卷 285-286页

作者： GHANBARI, M PEARSON, DE Dept. of Electron. Syst. Eng. Essex Univ. Colchester UK

The sources of bit-rate variation in a conditional-replenishment videoconference coder were found experimentally to be due to the interaction between coding method and image content. The isolation of the components of... 详细信息

关键词： DPCM bit-rate variation buffering coding method conditional-replenishment coder digital signals encoding image content packetisation picture processing pulse-code modulation teleconferencing transform coding video signals videoconference signals

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HIGH-FIDELITY MUSIC CODING AT 4 BITS

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ELECTRONICS LETTERS 1988年第8期24卷 493-495页

作者： SMYTH, SMF MCCANNY, JV Dept. of Electr. & Electron Eng. Queen's Univ. of Belfast

A very high-quality sub-band ADPCM music coding scheme which compresses high-fidelity music signals, bandlimited to 15 kHz, to an equivalent PCM representation of only 4 bits per sample, is described. By processing music sampled at 32 kHz, this coder exhibits a total bit rate of only 128 kbit/s and is consequently applicable to the ISDN. Subjective tests conducted with this coder have shown that music recovered from the compression scheme is essentially indistinguishable from the original material. The results obtained are of major importance, not only for ISDN and broadcasting, but also for other digital audio technology such as compact disc (CD) and digital audio tape

关键词： 128 kbit/s 15 kHz 4 bits per sample ADPCM CD Hi-Fi equipment Hi-Fi technique ISDN ISDN acoustic signal processing bandwidth compression broadcasting broadcasting compact disc compression scheme data compression digital audio tape digital audio technology digital communication systems encoding high-fidelity music signals music music coding pulse code modulation pulse-code modulation subband coding scheme

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NEURAL NET BASED NONSTANDARD A/D CONVERSION

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ELECTRONICS LETTERS 1988年第10期24卷 619-620页

作者： ANASTASSIOU, D COLUMBIA UNIV CTR TELECOMMUN RESNEW YORKNY 10027

A technique for nonstandard A/D conversion of signals subject to a fidelity criterion is described, based on Hopfield neural networks. Switched-capacitor neural networks offer a natural means for efficient implementation of the proposed technique. Applications include all forms of PCM coding, oversampled A/D conversion and digital image halftoning

关键词： Hopfield neural networks PCM coding analogue-digital conversion digital image halftoning encoding fidelity criterion neural nets nonstandard A/D conversion oversampled A/D conversion pulse-code modulation signal quantisation switched capacitor networks switched capacitor neural networks

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COST-EFFECTIVE DIGITAL SWITCHING NETWORK

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ELECTRONICS LETTERS 1985年第20期21卷 909-910页

作者： JAJSZCZYK, A Institute of Electronics & Communications ul. Technical University of Poznań Poznań Poland

A method for the design of cost-effective one-stage PCM switching networks composed of uniform time-space elements is proposed. These one-stage networks can be used as submodules for multistage networks, having, in ma... 详细信息

关键词： uniform time-space elements switching theory electronic switching systems switching networks multistage networks cost-effective one-stage PCM switching networks fewer elements pulse-code modulation digital switching network design method submodules Communication system theory

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STRAIGHTFORWARD DESIGN OF TRELLIS codeD modulation WITH NEW LOWER BOUND ON FREE EUCLIDEAN DISTANCE

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ELECTRONICS LETTERS 1989年第6期25卷 406-407页

作者： ZOU, G WEINRICHTER, H Tech. Univ. Wien Vienna Austria

A systematic way of designing efficient trellis coded modulation (TCM) is presented. Design is based on the concept of trellis partitioning and newly defined branch distances. A lower bound on free Euclidean distance ... 详细信息

关键词： branch distances encoding free Euclidean distance lower bound pulse-code modulation trellis coded modulation trellis partitioning

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COMBINING FAST DPCM COMPRESSION OF PICTURES WITH TREE ENCODING

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ELECTRONICS LETTERS 1988年第18期24卷 1148-1150页

作者： DELAMEILLIEURE, J BRUYLAND, I Commun. Eng. Lab. State Univ. Gent

Presents a fast DPCM coder built around a ROM of feasible size, in which an elementary form of tree encoding is integrated, to improve the quality of the decoded picture. Simulations illustrate the improvements of thi... 详细信息

关键词： ROM data compression decoded image differential PCM coder encoding fast DPCM compression image processing picture processing pictures pulse code modulation pulse-code modulation tree encoding

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