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检索条件"主题词=Linear Predictive coding"

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Memory vector quantization by power series expansion [in speech coding]

Memory vector quantization by power series expansion [in spe...

引用

IEEE Workshop on Speech coding Proceedings

作者： T. Eriksson F. Norden Chalmers University of Technology Goteborg Sweden

Memory quantization is studied in detail. We propose a framework, power series vector quantization (PSVQ), for analysis and development of memory quantizers. Furthermore, we present an optimization algorithm for the framework, and new memory quantization methods are derived from the framework. The new methods are applied to spectrum quantization, and are shown to outperform previous methods.

关键词： Vector quantization Decoding Source coding Speech coding History linear predictive coding Nonlinear distortion Distortion measurement Equations Algorithm design and analysis

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A multi-stage Levinson-Durbin algorithm

A multi-stage Levinson-Durbin algorithm

引用

Asilomar Conference on Signals, Systems & Computers

作者： R. Yu X. Lin C.C. Ko Laboratories for Information Technology Singapore Department of Electronic Engineering National University of Singapore Singapore

This paper proposes an adaptive multi-stage Levinson-Durbin algorithm, which is more numerically robust than the conventional Levinson-Durbin algorithm for input signals with high spectral dynamics such as speech or audio signals. At the same time, the proposed algorithm preserves the computational efficiency of the Levinson-Durbin algorithm. It can be therefore suitable to be used in practical linear prediction coding systems as a replacement of the Levinson-Durbin algorithm for better coding performance.

关键词： linear predictive coding Speech analysis Speech coding Filters predictive models Audio coding Wideband Signal design Signal analysis Laboratories

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Sound specific modelling and synthesis with a new postfiltering in low bit rate speech coding

Sound specific modelling and synthesis with a new postfilter...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： R.C. de Lamare L.M. da Silva A. Alcaim CETUC Catholic University of Rio de Janeiro Rio de Janeiro Brazil Department of Electrical Engineering University of Brasilia Brasilia Brazil

In this paper we investigate the use of fricatives and stops modelling and synthesis techniques with a spectral envelope reconstruction combined with noise reduction postfilter (SERNR) in mixed voiced-unvoiced multiband excitation coders. We perform a comparative analysis amongst a noise excitation approach operating at 1.75 kb/s and a fricatives and stops excitation technique operating at 0.4 kb/s. A novel SERNR postfiltering technique that significantly enhances the decoded speech is proposed and compared with the well-known adaptive spectral enhancement (ASE) filter.

关键词： Speech synthesis Bit rate Speech coding Filter bank Decoding linear predictive coding Internet telephony Frequency Noise reduction Performance analysis

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Joint optimization of model and excitation in CELP-type speech coders

Joint optimization of model and excitation in CELP-type spee...

引用

Asilomar Conference on Signals, Systems & Computers

作者： K. Lashkari T. Miki DoCoMo Communications Laboratory USA Inc. San Jose CA USA

This paper presents a new analysis-by-synthesis (AbS) technique for joint optimization of the excitation and model parameters based on minimizing the closed loop synthesis error instead of the linear prediction error. By minimizing the synthesis error, the analysis and synthesis stages become more compatible. Using a gradient search in the root domain, model parameters for a given excitation are optimized to minimize the error between the original and the synthesized speech. Since the optimization starts from the LPC solution, the synthesis error is guaranteed to be lower than that obtained using the LPC coefficients. For the ITU G.729 speech codec there is about 1dB of improvement in the segmental SNR for male and female speakers over 4 to 6 second long sentences. By adding an extra optimization step, the technique can be incorporated into any parametric coder such as LPC, multi-pulse LPC and CLEP-type speech coders in a bit stream compatible manner.

关键词： Speech synthesis Nonlinear filters Signal synthesis linear predictive coding Speech coding Speech analysis Polynomials Distortion measurement predictive models Error analysis

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A novel priority scheme for hybrid fiber coaxial broadband network

A novel priority scheme for hybrid fiber coaxial broadband n...

引用

IEEE Region 10 International Conference TENCON

作者： Kuo-Chi Chu Yi-Gang Tai Wei-Tsong Lee Pau-Choo Chung Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Information Engineering Feng Chia University FCU Taichung Taiwan

ISBN: (纸本)0780374908

It is necessary to provide priority-based data transfer on HFC networks. In this paper, we propose a scheme that can support priority-based bandwidth contention. The scheme is easy to realize. In addition, the overhead in the headend is extremely low. We use simulation to verify that the scheme we proposed can indeed make high-priority bandwidth requests have greater possibility to succeed than low-priority bandwidth requests.

关键词： Coaxial components Broadband communication Bandwidth Telecommunication traffic linear predictive coding Hybrid fiber coaxial cables Cascading style sheets TV Dynamic scheduling Degradation

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A new approach for computing LSP parameters from 10th-order LPC coefficients

A new approach for computing LSP parameters from 10th-order ...

引用

International Conference on Signal Processing Proceedings (ICSP)

作者： Dezhi Huang Lianhong Cai Department of Computer Science and Technology Tsinghua University Beijing China

ISBN: (纸本)0780374886

An new approach for computing line spectrum pair (LSP) parameters is proposed. The LSP parameters are proved to be the roots of two 5-degree algebraic equations. The root-solving procedure of such an equation is divided into three sections: 1) compute the inflexions and split (-2,2) into 5 subintervals; 2) search three roots in the shortest three subintervals respectively; 3) calculate the other two roots by formulas.

关键词： linear predictive coding Algebra Polynomials Equations Computer science Speech coding Speech recognition Computational complexity Filters

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Speaker-independent phonation recognition for Malay plosives using neural networks

Speaker-independent phonation recognition for Malay plosives...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： Hua Nong Ting J. Yunus S.H. Salleh Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia

The paper investigates the use of neural networks in recognizing the phonation of the speech sounds. The proposed method classifies the Malay plosive sounds of adults and children based on phonation in a speaker-indep... 详细信息

关键词： Neural networks Testing Loudspeakers linear predictive coding Hidden Markov models Spatial databases Feature extraction Speech coding Speech recognition Pattern recognition

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System on a chip for petroleum pipeline inspection

System on a chip for petroleum pipeline inspection

引用

Symposium on Integrated Circuits and Systems Design (SBCCI)

作者： F. da Silva Dutra F. Galvez-Durand V. Alves Universidade Federal do Rio de Janeiro Brazil

The present paper describes the implementation and experimental results of the DAQP02 system on a chip (SoC) for petroleum pipeline inspection. This integrated circuit is able to read and process information about physical phenomena inside pipelines. The DAQP02 has two multiplexed analog inputs, one 8-bit A/D converter, an 8-bit data bus and a 22-bit address bus. Due to its small dimensions and low power consumption features, it is an efficient in-line inspection tool. The integrated circuit was manufactured in CMOS 0.8 /spl mu/m double poly, double metal, n-well technology.

关键词： Petroleum Pipelines Inspection System-on-a-chip Energy consumption CMOS technology Data acquisition Prototypes linear predictive coding CMOS integrated circuits

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GPC method in segment of Chinese continuous sentence

GPC method in segment of Chinese continuous sentence

引用

International Conference on Signal Processing Proceedings (ICSP)

作者： Fan Jing Liu Huihua Sun Hai Department of Information & Communication Engineering Beijing Information Technology Institute China

ISBN: (纸本)0780374886

A new method for recognizing the start and the end of each word in a Chinese continuous sentence is discussed. We define a new recognition characteristic called periodic gradual change (PGC). A continuous speech sentence can be separated into many single words by a combination of the new method of PGC and other characteristics such as zero crossing rate (ZCR), instantaneous swing (E characteristic) and linear predictive coding (LPC) parameter. The recognition rate is improved for continuous speech segmentation by the new method.

关键词： linear predictive coding Arithmetic Speech recognition Speech enhancement Speech processing Sun Information technology Character recognition Autocorrelation Vectors

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Improved LSF estimation through anti-aliasing filtering

Improved LSF estimation through anti-aliasing filtering

引用

IEEE Workshop on Speech coding Proceedings

作者： K. Al-Naimi S. Villette A. Kondoz Centre for Communication Systems Research (CCSR) University of Surrey Guildford Surrey UK

Vocoders compress speech by estimating model parameters at a given transmission rate over an analysis window, assuming that speech is stationary within this window. In this paper, the limits of this assumption are explored with regard to the spectral envelope parameters in the form of line spectral frequency (LSF) parameters. It is shown that all LSF parameters have considerable variations over time, regardless of LSF vector extraction and transmission rates. LSF track variations are investigated through oversampling and are shown to contain high frequency variations above the frequency corresponding to the LSF vector transmission rate. An anti-aliasing filter with cut-off frequency adequate for the chosen LSF vector transmission rate is proposed to alleviate possible spectral overlapping of the LSF parameter spectra. It is confirmed, through experiments, that the proposed method offers an advantage over the classic LSF extraction method with respect to quantisation shown by bit savings of typically 10 to 15%.

关键词： Speech analysis Frequency Vocoders linear predictive coding Quantization Parameter estimation Filters Robust stability Bit rate Filtering

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