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检索条件"主题词=Linear predictive coding"

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Empirical mode decomposition of voiced speech signal

Empirical mode decomposition of voiced speech signal

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

作者： A. Bouzid N. Ellouze Computer Science Department Superior Institute of Technological Studies of Sfax Tunisia

This paper describes a new technique, called the empirical mode decomposition (EMD) that has recently been pioneered by N. E. Huang and al., for adaptively representing nonstationary signals as sums of zero-mean AM-FM components [N. E. Huang, et al., 1998]. The components, called intrinsic mode functions (IMFs), allow the analysis of frequency composition of one-dimensional signals. Applied to speech signal, the EMD allows us to study the different intrinsic oscillatory modes. Besides, computing the LPC analysis of each mode provides an estimation of formants. The presented method is firstly applied on a sum of pure frequency signals. Among different modes we can detect all frequencies taking a part of a signal.

关键词： Signal analysis linear predictive coding Speech analysis Iterative algorithms Signal processing Computer science Educational institutions Time frequency analysis Shape Wavelet analysis

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Fault diagnosis of the machines in power plants using LPC

Fault diagnosis of the machines in power plants using LPC

引用

International Forum on Strategic Technology, IFOST

作者： Ui-Pil Chong Sung-Sang Lee Chang-Ho Sohn School of Computer Engineering University of Ulsan South Korea

Fault diagnosis and monitoring of the machines operation in the power plants play an important role in safety operation and maintenance of those operating machines. In this paper we propose the fault diagnosis algorithm using the LPC coefficients with sound acquisition system from the operating machines through the single LPC spectrum is possible.

关键词： Fault diagnosis Power generation linear predictive coding Condition monitoring Power system reliability Equations Diffusion processes Safety Fault detection Random processes

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Evaluation of a technique involving processing with feature extraction to enhance the intelligibility of noise-corrupted speech

Evaluation of a technique involving processing with feature ...

引用

Annual Conference of Industrial Electronics Society

作者： R.J. Conway J.A. Heinen R.J. Niederjohn Department of Electrical and Computer Engineering Marquette University Milwaukee WI USA

Results obtained in an experimental evaluation of speech intelligibility of an adaptive processing technique designed to enhance the intelligibility of speech in noise are presented. The technique relies on speech features extracted from noise-corrupted speech to control a cepstral processor. The speech-processing algorithm has been improved over the fundamental technique described by R.J. Conway and R.J. Niederjohn (1987). The evaluation method makes use of a computer implementation of a modified version of the diagnostic rhyme test. Results for four subject and several signal-to-noise ratios are presented.< >

关键词： Feature extraction Speech enhancement Speech processing Wiener filter Noise cancellation Speech synthesis linear predictive coding Speech analysis Noise level Signal to noise ratio

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Fast adaptive polynomial root tracking using a homotopy continuation method

Fast adaptive polynomial root tracking using a homotopy cont...

引用

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

作者： S.T. Alexander V.L. Stonick Elec. and Comp. Engr. Department North Carolina State University Raleigh NC USA Elec. and Comp. Engr. Department Carnegie Mellon University Pittsburgh PA USA

A fast adaptive method for tracking the roots of a time-varying complex domain polynomial is derived. The approach uses the method of homotopy continuation and is efficient from both mathematical and implementation standpoints. The method is globally convergent and tracks all roots simultaneously. An example that verifies the accurate tracking ability of the algorithm is presented. Applications which could benefit from this method are also discussed.< >

关键词： Polynomials Equations Signal processing algorithms Frequency estimation Bit rate linear predictive coding Speech analysis Signal resolution Signal analysis Algorithm design and analysis

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A 1200 bps speech coder based on MELP

A 1200 bps speech coder based on MELP

引用

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

作者： Tian Wang K. Koishida V. Cuperman A. Gersho J.S. Collura SignalCom Inc. Goleta CA USA National Security Agency Fort Meade MD USA

This paper presents a 1.2 kbps speech coder based on the mixed excitation linear prediction (MELP) analysis algorithm. In the proposed coder, the MELP parameters of three consecutive frames are grouped into a superframe and jointly quantized to obtain a high coding efficiency. The interframe redundancy is exploited with distinct quantization schemes for different unvoiced/voiced (U/V) frame combinations in the superframe. Novel techniques for improving performance make use of the superframe structure. These include pitch vector quantization using pitch differentials, joint quantization of pitch and U/V decisions and LSF quantization with a forward-backward interpolation method. Subjective test results indicate that the 1.2 kbps speech coder achieves approximately the same quality as the proposed federal standard 2.4 kbps MELP coder.

关键词： Algorithm design and analysis Speech analysis Vector quantization Interpolation Testing Code standards linear predictive coding Bit rate Decoding Speech synthesis

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Improved Neural Efficiency under Matching Condition for Gifted Children

Improved Neural Efficiency under Matching Condition for Gift...

引用

International Conference on Natural Computation (ICNC)

作者： Xiaoju Duan Jiannong Shi Jianhui Wu Chinese Academy of Sciences Beijing Beijing CN Institute of Psychology Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424445424

To investigate the neural efficiency theory of intelligence, electroencephalograms (EEG) were recorded while 15 intellectually gifted children and 15 average children performed a 2-back working memory task. The amplitude of P2, N2, and LPC were analyzed. The results showed that intellectually gifted children performed more accurately and had larger LPC mean amplitudes than their intellectually average peers under the matching condition, suggesting that intellectually gifted individual can use their brain and allocate cognitive resources more efficiently.

关键词： linear predictive coding Psychology Pediatrics Brain Enterprise resource planning Electroencephalography Educational institutions Testing Resource management Recruitment

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A Multimedia CELP/Subband Coder for ATM Networks

A Multimedia CELP/Subband Coder for ATM Networks

引用

IEEE Workshop on Speech coding For Telecommunications

作者： R.E. Van Dyck J. Patel E. Simotas Q. Lin Center for Computer Aids for Industrial Productivity Rutgers University Piscataway NJ USA

The transmission of compressed audio and video data over ATM packet networks is quickly becoming a practical way to implement a multimedia teleconferencing system. To reduce the required bit rate of the combined audio/video sequence to that of basic rate ISDN, we encode the video using a subband coder and encode the audio using a CELP coder. In this paper, we examine the effects that packet losses, and the variable delay and delay jitter of ATM networks have on our audio coding system. Results for a large time-bandwidth product network are presented. Specifically, ways to make the speech coding more robust to packet loss are examined.

关键词： Speech Bit rate Filters linear predictive coding Asynchronous transfer mode Video compression Propagation losses Computer networks ISDN Delay effects

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Recovery of LSP Coefficient in VoIP Systems using Evolving Takagi-Sugeno Fuzzy Models

Recovery of LSP Coefficient in VoIP Systems using Evolving T...

引用

International Workshop on Genetic and Evolving Systems, GEFS

作者： Eric Jones Plamen Angelov Costas Xydeas DSP SW Nokia UK Limited Farnborough Hampshire UK Department of Communication Systems InfoLab2l Lancaster University Lancaster UK

In order to deliver real time, high quality voice services in packet based voice system (e.g. voice over Internet protocol, VoIP) system designers must tackle inherent quality problems related to possible packet loss. To combat the inevitable speech quality deterioration resulting from the loss of transmitted packets of speech information, techniques that provide estimates of the lost information that is needed by the speech recovery process are of considerable interest. Furthermore, in VoIP systems employing linear predictive coding (LPC) based speech coders, a significant percentage of the coded speech information represent the values of LPC coefficients and thus a new approach for estimating missing LPC filter coefficients is presented in this paper. This approach employs a new formulation of LSP recovery system architecture where evolving fuzzy rule-based models and particularly so-called evolving Takagi-Sugeno models are deployed to generate the required estimates of missing LSPs. The proposed missing parameters estimation technique is generic and initial experimental results demonstrate its considerable potential in improving the quality of LPC based decoded speech in VoIP applications

关键词： Takagi-Sugeno model Fuzzy systems linear predictive coding Speech processing Speech coding Real time systems Internet telephony Propagation losses Information filtering Information filters

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Erasure-robust speech coding and concealment in VoIP systems with frame packetization

Erasure-robust speech coding and concealment in VoIP systems...

引用

IEEE Emerging Technologies Symposium on Broadband Communications for the Internet Era Symposium

作者： J. Wang J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA

In voice over IP (VoIP) networks, multiple voice frames can be sent within one packet to increase the network efficiency. When packet loss happens, the voice decoder often tries to conceal the erased frames from received parameters. This paper discuss the quantitative dependency of concealment quality on the packetization rate in terms of LPC distortion. The performance of an erasure-robust. concealment method is analyzed and simulated in comparison with the standard G.729 concealment method. Results show that around 1.2 dB improvement on spectral distortion can be obtained with erasure robust. concealment compared with G.729 under 1-6 frames/packet, packetization. A method to determine the maximum packet size given the network load and expected concealment quality is introduced. The proposed method serves as the packetization guidance during the call setup procedure in VoIP sessions.

关键词： Speech coding Internet telephony Decoding linear predictive coding Degradation Bandwidth Robustness Interpolation Filters Books

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A Novel Load Shedding Framework LS-LG for Similarity Querying on Data Stream

A Novel Load Shedding Framework LS-LG for Similarity Queryin...

引用

WRI World Congress on Software Engineering, WCSE

作者： Xiaoling Xia Weimin Li School of Computer Science & Technology Donghua Uinversity Shanghai China School of Computer Science & Technology Shanghai University Shanghai China

It is important to obtain effective feature values of data stream and forecast them in overload system for mining data stream, because data streams are often bursty and data characteristic vary over time. In this paper, we introduce linear predictive coding (LPC) technology to obtain feature values using fewer coefficients. Generalized autoregressive conditional heteroscedastic (GARCH) -generalized regression neural network (GARCH-GRNN) model is used to forecast the feature values of which the data streams are shed, and we perform similarity search using these forecasting values. A load shedding framework based on LPC and GARCH-GRNN (LS-LG) for similarity search on data stream is constructed to achieve minimized mining loss. Experimental results indicate that LS-LG is an effective method in improving query quality when the system is under overload situation.

关键词： linear predictive coding Data analysis Computer science Data mining Degradation Software engineering Neural networks predictive models Constraint optimization Delay

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