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检索条件"主题词=Linear predictive coding"

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Characterizing music dynamics for improvisation

Characterizing music dynamics for improvisation

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： S.H. Srinivasan Applied Research Group Satyam Computer Services Limited Bangalore India

Characterizing music dynamics is important for music generation, music analogies, music retrieval, music improvisation etc. Though there has been some works on modeling music, most of them do not consider the temporal or dynamical aspects of music. In this paper we show that it is possible to characterize music dynamics using linear prediction. We provide a technique for music improvisation using this model. The improvisation scheme is then applied to the generation of background music for videos

关键词： Multiple signal classification Network synthesis Signal synthesis Videos linear predictive coding Character generation Music information retrieval Cultural differences Animation Games

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Scintigraphic investigation methods in pulmonary hypertension diagnostics and lesser pulmonary circulation reserve potential evaluation among patients with mitral valve failure

Scintigraphic investigation methods in pulmonary hypertensio...

引用

International Forum on Strategic Technology, IFOST

作者： N.G. Krivinogov V.M. Gulyaev A.V. Yevtushenko A.M. Gulyaev Yu.B. Lishmanov Research Institute of Cardiology Tomsk Scientific Center Siberian Branch Russian Academy of Science Tomsk Russia

Pulmonary hypertension and bloodstream affection are considered to be major factors that determine indication for operation and limit its successful fulfillment among patients with mitral valve failure. This paper aims to develop new systematic approach to radionuclide diagnostics of pulmonary hypertension and to evaluate reserve potential of lesser pulmonary (LP) hemodynamics among patients with mitral valve failure. 35 patients aged 28 to 55 (the average age rate is 45,0/spl plusmn/2,4 years) having II-III stage of mitral stenosis and various pulmonary hypertension intensity have been examined. The evaluation of lesser pulmonary circulation (LPC) potential has been carried out with the application of acute aminophyllin test under direct manometry of the right ventricle of heart and pulmonary artery. Obtained data of pressure direct measurement have been compared with the results of radionuclide angiocardiography (RACG). Comparing the results of direct manometry in the right ventricle of heart (RVH) cavities and pulmonary artery (PA) with parameters calculated on the basis of conducted radionuclide investigations, the notions of scintigraphic index "Crvh/Cpa" (correlation of the evacuation constants from the radiopharmaceutical right ventricle of heart and pulmonary artery, and mean pulmonary arterial pressure.) During the acute pharmacological aminophyllin test direct connection of pressure in pulmonary artery and right ventricle of heart measured by the direct method with the correlation of CRVH/CPA has been detected. Carried out analysis of the obtained data showed that among people with "positive" reaction for aminophyllin early postoperative period passed without any complications with the parameters recovery of a LP hemodynamics. However, among patient shaving no LPC reaction for aminophyllin the residual pulmonary hypertension and right ventricular overload after surgical correction was still present. Suggested method of indirect pressure definition in pulmo

关键词： Hypertension Valves Arteries Heart Testing Hemodynamics linear predictive coding Pressure measurement Angiocardiography Aging

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A model-based clustering for time-series with irregular interval

A model-based clustering for time-series with irregular inte...

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Xiao-Tao Zhang Wei Zhang Xiong Xiong Qi-Wen Wang Cui-Yu Li School of Management Tianjin University Tianjin China Tianjin University of Finance & Economics Tianjin China School of Mechanical Engineering Tianjin University Tianjin China

ISBN: (纸本)0780384032

Clustering problems are central to many knowledge discovery and data mining tasks. However, most existing clustering methods can only work with fixed-interval representations of data patterns, ignoring the variance of time axis. In this paper, we study the clustering of data patterns that are sample in irregular interval. In the paper, a model-based approach using cepstrum distance metrics and autoregressive conditional duration (ACD) model is proposed. Experimental results on real datasets show that this method is generally effective in clustering irregular space time series, and conclusion inferred from experimental results agrees with the market microstructure theories.

关键词： Hidden Markov models Data mining Brain modeling Gene expression linear predictive coding Microstructure Cepstral analysis Speech analysis Time series analysis Electroencephalography

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Speaker recognition based on transformed line spectral frequencies

Speaker recognition based on transformed line spectral frequ...

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Bong Jin Lee S. Kim Hong-Goo Kang MCSP Yonsei University Seoul South Korea

Line spectral frequencies (LSF) and five types of transformed LSF are studied for robust text-independent speaker identification. Transformations are constructed by considering physical aspects of the vocal tract. These aspects are: location of formants/nulls; bandwidth of formants/nulls; bandwidth and location of formants; bandwidth and location of nulls; interval of adjacent formant and null locations. Identification tests using the TIMIT database verify that all features are useful for speaker recognition; the bandwidth and location of formants, especially, show the best performance. Simulation results also show that LSF and some of the transformed LSF give better performance than Mel-frequency cepstral coefficient (MFCC).

关键词： Speaker recognition Bandwidth Mel frequency cepstral coefficient Spatial databases Polynomials Equations Robustness linear predictive coding Testing Cepstral analysis

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Wideband audio over narrowband low-resolution media

Wideband audio over narrowband low-resolution media

引用

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

作者： Heping Ding Institute for Microstructural Sciences National Research Council Canada

ISBN: (纸本)0780384849

This paper proposes a scheme of transmitting or storing a wideband audio stream in a channel or storage medium which is narrowband in nature and with a low resolution data format, such as an 8-bit companded one. In the proposed scheme, signal components in the upper-band part of the wideband beyond the narrowband - are encoded and then the code is embedded into the narrowband stream in a least audible way. As a result, this scheme enables the transmission and storage of wideband audio signals with the existing narrowband infrastructure. Furthermore, the scheme is fully backward compatible, i.e., conventional receivers, without the proposed decoding mechanism, can still access the narrowband audio with little audible degradation. The proposed scheme can find applications in areas where a high quality wideband audio is needed but the physical bandwidth is limited. Examples are voice-over-IP and telephony in general, as well as digital storage and playback.

关键词： Wideband Narrowband Niobium Payloads Frequency Transmitters Sampling methods linear predictive coding National security Decoding

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New methods of tricuspid annuloplasty and possibility of their commercial using

New methods of tricuspid annuloplasty and possibility of the...

引用

International Forum on Strategic Technology, IFOST

作者： M.V. Krivov V.M. Shipulin A.V. Evtouchenko Cardiovascular Surgery Department of Institute of Cardiology Tomsk Science Center Siberian Branch Russian Academy of Science Tomsk Russia

Insufficiency of the tricuspid valve often complicates the flow of acquired valve diseases of the left heart parts. The prognosis in patients with mitral and/or aortic valve repair/replacement but without of surgery on tricuspid valve in these cases is unfavourable. Thus the elaboration of new methods of tricuspid valve surgery is highly significant. In Cardiovascular department of Institute of Cardiology was created new method of tricuspid annuloplasty tricuspid circular purse annuloplasty. The advantages of this method in front of De Vega tricuspid annuloplasty method are described in the article.

关键词： Cardiology Cardiac disease Heart valves Testing Arteries linear predictive coding Hypertension Surgery Cardiovascular diseases TV

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On split quantization of LSF parameters

On split quantization of LSF parameters

引用

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

作者： F. Nordin T. Eriksson Dept. of Commun. Technol. Aalborg Univ. Denmark Department of Signals and Systems Chalmers University of Technology Göteborg Sweden

In this paper we investigate split quantization of the LSF source from an information theoretic perspective. It is a well known fact that split quantization is inferior to unconstrained quantization, due to the independent treatment of sub vectors. Here, we quantify lower bounds for the split loss, and suggest conditional quantization of splits as a method to reduce the losses. The investigation is based on information theoretic estimates of performance, rather than on the performance of actual quantization schemes. Simulations for a 10-dimensional LSF source point at a loss of around 8 bits if scalar quantization is performed, and a loss of approximately 2 bits for a 2-split quantization, both compared to 10 dimensional vector quantization. Furthermore, the results suggest that these losses can be considerably reduced using conditional quantization, down to as low as 0 to 2 bits.

关键词： Random variables Entropy Vector quantization Speech coding Bit rate Mutual information Communications technology Estimation theory linear predictive coding Frequency

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Reduced-delay mixing of compressed speech signals for VoIP and cellular telephony

Reduced-delay mixing of compressed speech signals for VoIP a...

引用

Asilomar Conference on Signals, Systems & Computers

作者： J.D. Gordy R.A. Goubran Department of Systems and Computer Engineering Carleton University Ottawa ONT Canada

This paper introduces techniques for reducing the computational complexity of re-encoding mixed speech using LPC-based vocoders, with application to conferencing over VoIP and cellular telephony networks. Our methods exploit a priori knowledge of the LPC synthesis filter coefficients, codebook gains and pitch periods for the compressed source speech signals. Experimental results with a modified G.729 vocoder show an average spectral distortion of 1.61 dB compared to reference mixed signals, 1.34 dB less than that introduced by the full encoder. Furthermore, the proposed techniques introduce no additional decrease in speech quality measured using ITU P.862 (PESQ) and informal MOS tests.

关键词： Internet telephony Vocoders Speech synthesis Computational complexity Cellular networks linear predictive coding Network synthesis Signal synthesis Filters Distortion

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A structured speech model with continuous hidden dynamics and prediction-residual training for tracking vocal tract resonances

A structured speech model with continuous hidden dynamics an...

引用

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

作者： Li Deng L.J. Lee H. Attias A. Acero Microsoft Research Limited Redmond WA USA

A novel approach is developed for efficient and accurate tracking of vocal tract resonances, which are natural frequencies of the resonator from larynx to lips, in fluent speech. The tracking algorithm is based on a version of the structured speech model consisting of continuous-valued hidden dynamics and a piecewise-linearized prediction function from resonance frequencies and bandwidths to LPC cepstra. We present details of the piecewise linearization design process and an adaptive training technique for the parameters that characterize the prediction residuals. An iterative tracking algorithm is described and evaluated that embeds both the prediction-residual training and the piecewise linearization design in an adaptive Kalman filtering framework. Experiments on tracking vocal tract resonances in Switchboard speech data demonstrate high accuracy in the results, as well as the effectiveness of residual training embedded in the algorithm. Our approach differs from traditional formant trackers in that it provides meaningful results even during consonantal closures when the supra-laryngeal source may cause no spectral prominences in speech acoustics.

关键词： Speech predictive models Resonance Resonant frequency Larynx Lips Bandwidth linear predictive coding Process design Iterative algorithms

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Pitch synchronous addition and extension for linear predictive analysis of noisy speech

Pitch synchronous addition and extension for linear predicti...

引用

Proceedings of the Nordic Signal Processing Symposium (NORSIG)

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

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