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检索条件"主题词=Linear predictive coding"

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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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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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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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Segmentation of coarticulated basic units in isolated Bangla words using multifactorial analysis

Segmentation of coarticulated basic units in isolated Bangla...

引用

IEEE India Conference (INDICON)

作者： T. Chattopadhyay B.B. Chaudhuri Systems TCS Kolkata India Computer Vision and Pattern Recognition Unit Indian Statistical Institute India

One of the major challenges in speech synthesis and recognition is coarticulated unit segmentation. In this paper we present a novel technique for segmenting the basic coarticulated units using multifactorial analysis based approach. The proposed algorithm is applied on isolated spoken words in Bangla. The results obtained from a considerably large database show the strength of the approach.

关键词： Speech synthesis State-space methods Databases Automatic speech recognition Image segmentation Image processing linear predictive coding Switches Testing Signal analysis

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Cenetic algorithms approach to vehicle routing and scheduling

Cenetic algorithms approach to vehicle routing and schedulin...

引用

Proceedings of the Biannual World Automation Congress

作者： S.M.S. Khanian T. Szecsi M.S.J. Hashmi School of Mechanical and Manufacturing Engineering University of Dublin Dublin Ireland School of Mechanical and Manufacturing Engineering Dublin City University Ireland

Vehicle routing and scheduling is considered as an NP-Hard combinatorial problem that must be solved under multiple constraints. The most important tasks of vehicle routing and scheduling should considcr various constraints, such as manpower and vehicle availability, environmental conditions, union restrictions, and supply demand behaviours. This paper considers a delivery task in which propane gas has to be delivered from various supply sources (Gas refineries) to a number of destinations (Proccssing plants) during a working day, by means of a given fleet at minimum cost. To support mangers in vehicle routing and scheduling of thc propane deliveries a Decision Support System (DSS) based on Cenctic Algorithms (GA) is purposed. A GA-bascd search engine is developed to determine the optimum routes for planning thc deliveries.

关键词： Scheduling algorithm Vehicles Routing Costs Transportation linear predictive coding Decision support systems Cities and towns Content addressable storage Logistics

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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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Music instrument recognition: from isolated notes to solo phrases

Music instrument recognition: from isolated notes to solo ph...

引用

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

作者： A.G. Krishna T.V. Sreenivas Department of Electrical Communication Engineering Indian Institute of Science Bangalore India

Speech and audio processing techniques are used along with statistical pattern recognition principles to solve the problem of music instrument recognition. Non-temporal, frame level features only are used so that the proposed system is scalable from the isolated notes to the solo instrumental phrases scenario without the need for temporal segmentation of solo music. Based on their effectiveness in speech, line spectral frequencies (LSF) are proposed as features for music instrument recognition. The proposed system has also been evaluated using MFCC and LPCC features. Gaussian mixture models and K-nearest neighbour model classifier are used for classification. The experimental dataset included the Ulowa MIS and the C Music corporation RWC databases. Our best results at the instrument family level is about 95% and at the instrument level is about 90% when classifying 14 instruments.

关键词： Multiple signal classification Instruments Automatic speech recognition Speech recognition Mel frequency cepstral coefficient Speech analysis Speech processing Pattern recognition Cepstral analysis linear predictive coding

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

Pitch synchronous addition and extension for linear predicti...

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

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

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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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