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检索条件"主题词=Linear Predictive coding"

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Adaptive underwater target classification with multi-aspect decision feedback

Adaptive underwater target classification with multi-aspect ...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： M.R. Azimi-Sadjadi A.A. Jamshidi G.J. Dobeck Department of Electrical and Computer Engineering Colorado State University Fort Collins CO USA NSWC-Dahlgren Division Coastal Systems Station Signal and Image Processing Group Panama

ISBN: (纸本)0780370449

This paper presents a new scheme for underwater target classification in a changing environment. An adaptive target classification system is developed that uses the decisions of multiple aspects of the objects. The system employs a decision feedback mechanism to map the changed feature vector to a new feature space familiar to the classifier. Results on an acoustic backscattered data set, namely the 40 kHz data collected at Coastal Systems Station (CSS), are presented. This data set contains returns from six different objects at 72 aspect angles with 5 degrees separation and with varying signal-to-reverberation ratio (SRR). The results are then benchmarked with those of a neural network-based multi-aspect fusion system.

关键词： Feedback Adaptive systems Neural networks Sea measurements Cascading style sheets Reverberation Robustness linear predictive coding Testing Chirp modulation

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On extensive pump handling of chemical-mechanical polishing slurries

On extensive pump handling of chemical-mechanical polishing ...

引用

IEEE/SEMI Conference and Workshop on Advanced Semiconductor Manufacturing

作者： R.K. Singh B.R. Roberts Chemical Management Division BOC Edwards Santa Clara CA USA

ISBN: (纸本)0780365550

The effects of extensive pump handling on chemical-mechanical polishing (CMP) slurries have been investigated in this study. A number of common CMP slurries were recirculated in bellows pump loops. Large particle counts (LPC) and particle size distributions (PSDs) were generated using commercially available instruments. The PSDs of oxide CMP slurries illustrate distinct, developing characteristics as a result of repeated shearing during handling. Unlike most silica oxide slurries, alumina- and ceria-based slurries do not seem to generate large particles due to pump handling over extended periods of time. Some of these slurries show a decrease in number of large particles or soft flakes in pump recirculation tests. The PSD and LPC data for an oxide slurry handling test in a vacuum-pressure-dispense-technology-based pump show generation of fewer large particles as compared to a bellows pump. This study also demonstrates that insignificant progressive settling of abrasive particles takes place inside the pump or in the pump loop during handling of quick-settling CMP slurries.

关键词： Chemicals Slurries linear predictive coding Bellows Shearing Silicon compounds Testing Inorganic materials Solids Vacuum systems

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Efficient implementation of low bit rate 1.6 Kbps speech coder using field programmable gate arrays

Efficient implementation of low bit rate 1.6 Kbps speech cod...

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Han-Chiang Chen Advanced Technology Center Computer and Communication Laboratories Industrial Technology and Research Institute Hsinchu Taiwan

The cost-effective hardware architecture of a low bit rate 1.6 Kbit/s LPC (linear predictive coefficient)-based vocoder is proposed. The proposed architecture integrates both algorithms of the encoder and decoder. In the encoder, a simple finite state machine is presented to compute the autocorrelation function of speech. At the decoder side, efficient circuits are designed to transfer LSP (lne spectrum pair) to LPC. Only 29000 gate counts of XILINX XC4036XL FPGA are used to implement the vocoder.

关键词： Bit rate Speech Computer architecture linear predictive coding Vocoders Decoding Hardware Automata Autocorrelation Circuits

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Single and double frame quantization of LSF parameters using noise feedback coding

Single and double frame quantization of LSF parameters using...

引用

IEEE International Conference on Communications (ICC)

作者： A.R. Fazel A.K. Khandani Department of Elec. and Comp. Engineering University of Waterloo Waterloo ONT Canada

We present a scheme for single frame (20 msec) and double frame (40 msec) quantization of line spectral frequency (LSF) parameters in a code-excited linear prediction (CELP) speech coder using noise feedback coding. To improve the performance, an appropriate lattice structure is used as the quantizer in the noise feedback loop. We also consider a switched structure based on using either a double frame quantizer or two single frame quantizers for two subsequent frames where an extra bit is used to specify the choice offering a lower distortion. Numerical results are presented showing an excellent performance with very low complexity.

关键词： Quantization Distortion measurement Delay Filters linear predictive coding Speech coding Speech analysis Euclidean distance Speech enhancement Feeds

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A performance comparison of robust speech analysis methods in noisy environments

A performance comparison of robust speech analysis methods i...

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International Symposium on Intelligent Multimedia, Video and Speech Processing

作者： T. Shimamura Department of Information and Computer Sciences Saitama University Urawa Japan

Various speech analysis methods are compared from the points of view of robustness against noise. Computer simulations reveal that the most robust method is the instrumental variable method involving an input estimati... 详细信息

ISBN: (纸本)9628576623

关键词： Speech analysis Working environment noise Speech enhancement linear predictive coding Noise robustness Additive noise Noise figure Instruments Filters White noise

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Large bandwidth, highly efficient mode coupling using long-period gratings in dispersion tailored fibers

Large bandwidth, highly efficient mode coupling using long-p...

引用

Optical Fiber Communication (OFC) Conference

作者： S. Ramachandran M. Yan L. Cowsar A. Carra P. Wisk R. Huff Lucent Technologies Bell Laboratories Murray Hill NJ USA

We report the demonstration of strong (>20 dB) coupling in long-period fiber-gratings over bandwidths as large as 43 nm. These novel spectra are obtained by suitably tailoring the dispersion properties of a fiber. ... 详细信息

ISBN: (纸本)1557526559

关键词： Bandwidth Fiber gratings Optical fiber polarization Resonance Frequency conversion Optical fiber devices Narrowband linear predictive coding Propagation constant Dispersion

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Lowdelay combined wideband speech and audio coding with scalable bit rates

Lowdelay combined wideband speech and audio coding with scal...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： M. Farrugia A.M. Kondoz Telecom Modus Limited Surrey UK Multimedia Communications Group CCSR University of Surrey Guildford Surrey UK

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Explaining the reduced floating body effects in narrow channel SOI MOSFETs

Explaining the reduced floating body effects in narrow chann...

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IEEE SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S)

作者： J. Pretet N. Subba D. Ioannou S. Cristoloveanu W. Maszara C. Raynaud STMicroelectronics Crolles France LPCS (UMR CNRS & INPG) ENSERG Grenoble France ECE Dept George Mason University Fairfax VA USA Advanced Micro Devices Inc. Sunnyvale CA USA LETI-CEA Grenoble France

We focus on the floating body effects (FBEs) in narrow channel SOI MOSFETs such as saturation subthreshold swing, breakdown voltage and single transistor latch-up. We find that all improve as the channel width decreases and examine the mechanisms causing this improvement. We demonstrate experimently and by simulation, that the reduced FBEs in narrow channel devices are caused by dopant outdiffusion and lifetime reduction along the channel edges.

关键词： MOSFETs Charge carrier lifetime Isolation technology Numerical simulation Doping profiles linear predictive coding Threshold voltage Condition monitoring Breakdown voltage Voltage measurement

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Neural network speaker dependent isolated Malay speech recognition system: handcrafted vs genetic algorithm

Neural network speaker dependent isolated Malay speech recog...

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International Symposium on Signal Processing and Its Applications (ISSPA)

作者： M.S.H. Salam D. Mohamad S.H.S. Salleh Faculty of Computer Science and Information Technology University Technology of Malaysia Malaysia Faculty of Electrical Engineering University Technology of Malaysia Malaysia

We compare two approaches in selecting neural network learning parameters and architecture. Traditionally they are found by trial and error (handcrafted) and alternatively, can be found using a genetic algorithm. Trial and error can find good solutions but the drawback is this method is time consuming and it can only try a few possible solutions while the genetic algorithm is known to be able to search for a good solution intelligently and faster with greater diversity of possible solutions. We tested the approaches on ten isolated Malay digits from 0 to 9. Three factors are compared between the two approaches: time to get a good solution; network learning convergence; and the recognition rate. Our findings show that the neural network using the genetic algorithm achieved 94% recognition rate while the handcrafted neural network achieved 95%. However, using the genetic algorithm, a good solution can be found within days while with the handcrafted method it took weeks. The network learning convergence for both approaches were relatively the same.

关键词： Neural networks Speech recognition Genetic algorithms Speech analysis Automatic speech recognition Testing Signal processing Isolation technology Computer errors linear predictive coding

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Neural speech synthesis system for Arabic language using CELP algorithm

Neural speech synthesis system for Arabic language using CEL...

引用

ACS/IEEE International Conference on Computer Systems and Applications

作者： S. Ben Sassi R. Braham A. Belghith CRYSTAL Laboratory Ecole Nationale des Sciences de lE28099 Informatique Campus Universitaire la Manouba Mannouba Tunisia

ISBN: (纸本)0769511651

Speech is the most natural and widespread form of human communication. That is why speech synthesis has interested researchers for decades. It turns out that developing an unlimited text-to-speech system is an enormous task. The traditional methods (synthesis by rule and synthesis by concatenation of pre-recorded sounds) used for this have not given good results. In such a situation, neural networks (NNs) have the potential to give better results thanks to their property of interpolation and their capacity of generalisation. We present a synthesis system for the Arabic language. The choice of parameters which will be used to drive the NN is very important and have an effective influence on the quality of produced speech. Work has been done to evaluate different methods based on linear predictive coding; the resulting speech was machine-like and not intelligible. We suggest to use CELP to drive the NN, which provides high quality speech.

关键词： Speech synthesis Natural languages Network synthesis Neural networks Humans Laboratories Interpolation linear predictive coding Speech coding Speech analysis

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