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检索条件"主题词=linear predictive coding"

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Near Optimal H∞ Tracking for a Compact Set of Plants

Near Optimal H∞ Tracking for a Compact Set of Plants

引用

IEEE Conference on Decision and Control

作者： D.E. Miller Li Qiu Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

Here we consider the problem of providing near optimal performance for a large set of possible models. We adopt the H ∞ framework in the single-input single-output (SISO) setting with structured uncertainty: a compact set of controllable and observable plant models of a fixed order; we consider the control problem of designing a controller to minimize the worst case performance. We consider two different feedback configurations, and under a mild assumption we prove that a linear periodic controller (LPC) exists which achieves the objective.

关键词： Uncertainty Adaptive control linear predictive coding Robust control linear feedback control systems Wideband Inductance State feedback Councils Control systems

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Fully vector-quantized subband coding with adaptive codebook allocation

Fully vector-quantized subband coding with adaptive codebook...

引用

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

作者： A. Gersho T. Ramstad I. Versvik Department of Electrical and Computer Engineering University of California Santa Barbara CA USA Division of Telecommunications Norwegian Institute of Technology Trondheim Norway Nesbru Norway

Vector quantization (VQ) is examined as a technique to enhance performance in subband coding of speech at 9.6 kb/s. The set of short-term subband power levels is vector quantized, providing low-rate side information to control the coding of the subband signals. Each subband signal is then vector quantized with variable size codebooks that are dynamically assigned by the quantized side information. Two versions are described, a 7-band coder and a 14-band coder. Simulation results demonstrate that vector quantization offers a distinct perceptual improvement compared with scalar quantization of the same subband signals and side information for the same total bit rate.

关键词： Bit rate Vector quantization Filter bank linear predictive coding Speech coding Signal synthesis Frequency synthesizers Digital TV Speech enhancement Hardware

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Locality preserving constraints for super-resolution with neighbor embedding

Locality preserving constraints for super-resolution with ne...

引用

IEEE International Conference on Image Processing

作者： Bo Li Hong Chang Shiguang Shan Xilin Chen School of Computer Science and Technology Harbin Institute of Technology Harbin China Chinese Academy of Sciences Beijing Beijing CN

In this paper, we revisit the manifold assumption which has been widely adopted in the learning-based image super-resolution. The assumption states that point-pairs from the high-resolution manifold share the local geometry with the corresponding low-resolution manifold. However, the assumption does not hold always, since the one-to-multiple mapping from LR to HR makes neighbor reconstruction ambiguous and results in blurring and artifacts. To minimize the ambiguous, we utilize Locality Preserving Constraints (LPC) to avoid confusions through emphasizing the consistency of localities on both manifolds explicitly. The LPC are combined with a MAP framework, and realized by building a set of cell-pairs on the coupled manifolds. Finally, we propose an energy minimization algorithm for the MAP with LPC which can reconstruct high quality images compared with previous methods. Experimental results show the effectiveness of our method.

关键词： Strontium Image reconstruction linear predictive coding Spatial resolution Image resolution Human resource management Geometry Energy resolution Computer science Information processing

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An improved initialization algorithm for use with the K-means algorithm for code book generation

An improved initialization algorithm for use with the K-mean...

引用

IEEE Southeastcon

作者： S. Easwaran J.N. Gowdy Department Electrical & Computer Engineering Clemson University Clemson SC USA

A novel algorithm for codebook initialization for use with the K-means algorithm for codebook generation is presented. This algorithm was shown to result in better codebooks at considerably reduced generation time compared to Lloyd's algorithm and to other codebook initialization algorithms. The proposed algorithm generated codebooks with smaller maxima and smaller standard deviations of the codebook vector quantization (VQ) distortions. These outcomes were consistently observed with substantial margins for all cases considered.< >

关键词： Books Distortion measurement Convergence Minimization methods Minimax techniques linear predictive coding Cepstral analysis

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An improvement of LPC based on noise reduction using pitch synchronous addition

An improvement of LPC based on noise reduction using pitch s...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

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

In this paper, we propose a pitch synchronous addition method for LPC analysis by making use of the periodicity of speech. It is shown that the solution overcomes the difficulty involved with the technique of noise reduction compatible with the stability of the LPC filter obtained by subtracting the noise part from the autocorrelation function of speech. The relation between the pitch period of speech and the improvement in signal-to-noise ratio accomplished by the method is investigated. The simulation results show the effectiveness of the proposed method especially for high-pitched speech.

关键词： linear predictive coding Noise reduction Speech enhancement Filters Autocorrelation Speech analysis Stability Working environment noise Additive noise Signal to noise ratio

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Optimal time segmentation for signal modeling and compression

Optimal time segmentation for signal modeling and compressio...

引用

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

作者： P. Prandom M. Goodwin M. Vetterli LCAV Ecole Polytech. Fed. de Lausanne Switzerland EECS University of California Berkeley USA LCAV Ecole Polytechnique Fédérale de Lausanne Switzerland

The idea of optimal joint time segmentation and resource allocation for signal modeling is explored with respect to arbitrary segmentations and arbitrary representation schemes. When the chosen signal modeling techniques can be quantified in terms of a cost function which is additive over distinct segments, a dynamic programming approach guarantees the global optimality of the scheme while keeping the computational requirements of the algorithm sufficiently low. Two immediate applications of the algorithm to LPC speech coding and to sinusoidal modeling of musical signals are presented.

关键词： linear predictive coding Speech coding Cost function Dynamic programming predictive models Partitioning algorithms Rate distortion theory Space exploration Time frequency analysis Quality management

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Waveform data compression with exact recovery

Waveform data compression with exact recovery

引用

Data Compression Conference (DCC)

作者： S.D. Stearns Sandia National Laboratories Albuquerque NM USA

Summary form only given. A data compression technique has been developed for efficient communication and storage of seismic waveform data. The technique is also useful with similar kinds of continuous waveform data. It uses a special version of the linear predictive coding method, along with secondary bi-level sequence coding. The principal feature of this two-stage technique is that it provides exact, bit-for-bit recovery of the original data.< >

关键词： Data compression Instruments Telemetry Laboratories linear predictive coding Encoding Data communication Information retrieval Narrowband Testing

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Speech analysis by selective linear prediction in the time domain

Speech analysis by selective linear prediction in the time d...

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

作者： R. Mizoguchi M. Yanagida O. Kakusho Institute of Scientific and Industrial Research Osaka University Suita Osaka Japan

linear prediction method is one of the most frequently used analysis methods of speech. Covariance method and auto-correlation method of linear prediction often fail to make a precise analysis of speech because of the excitation source or fundamental frequency. In order to decrease the affect of the excitation source, various kinds of difference operations are usually employed for preprocessing. However, such preprocessings do not always work satisfactorily. Here proposed is a new approach to LPC analysis based on selective use of speech data to reject the data disturbed by the excitation source, and is called selective linear prediction method. The method is constructed aiming to improve the accuracy of analysis. First, the formulation of linear prediction is presented using generalized inverse matrices. Then, a successive computation is described based on Givens' reduction. The selective computation, which plays an essential role in our method, owes its efficiency to Givens' reduction. Finally the advantage of the proposed method is demonstrated by computer simulation using both synthetic and natural speech.

关键词： Speech analysis Time domain analysis linear predictive coding Equations Performance analysis

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A speech analysis-synthesis system based on the ARMA model and its evaluation

A speech analysis-synthesis system based on the ARMA model a...

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

作者： H. Morikawa H. Fujisaki Faculty of Engineering University of Tokyo Bunkyo Tokyo Japan

The ARMA model provides an effective means for precise representation of the speech production process. A stable and accurate estimation of ARMA parameters from the speech signal has been shown to be possible by the SEARMA method. In this paper we propose an ARMA speech analysis-synthesis system based on the SEARMA method. The validity of the proposed system is investigated by means of both objective and subjective evaluation. The results reveal that the zeros in the spectrum contribute to the reduction of spectral distortion and to the improvement of the quality of synthetic speech.

关键词： Speech analysis Speech synthesis Quantization Interpolation Speech processing linear predictive coding Poles and zeros Parameter estimation Filters Frequency estimation

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A low-bit rate segment vocoder using minimum residual energy criteria

A low-bit rate segment vocoder using minimum residual energy...

引用

National Conference on Communications (NCC)

作者： Abhijit Pradhan Sadhana Chevireddy Kamakoti Veezhinathan Hema Murthy Department of Computer Science Indian Institute of Technology Madras Chennai India

ISBN: (纸本)9781424463831;9781424463855

In speech coding, segment vocoders offer good intelligibility at low bit rates. A segment vocoder has four basic components 1) Segmentation of input speech 2) Segment quantization 3) Residual quantization 4) Synthesis of speech. Most segment vocoders use a recognition approach to segment quantization. In this paper, we assume a different approach to segment quantization. The segmental unit is a syllable and the segment codebook stores the sequence of LPC vectors. During the encoding process the speech segment is quantized using the sequence of LPC vectors that result in the smallest residual energy. PESQ scores indicate that this vocoder achieves better quality compared to that of a corresponding vocoder that uses a speech recognition framework.

关键词： Vocoders Speech synthesis linear predictive coding Encoding Bit rate Signal synthesis Hidden Markov models Quantization Decoding Speech coding

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