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AM-FM Estimation for Speech Based on a Time-Varying Sinusoidal Model

AM-FM Estimation for Speech Based on a Time-Varying Sinusoid...

引用

10th INTERSPEECH 2009 Conference

作者： Pantazis, Yannis Rosec, Olivier Stylianou, Yannis Institute of Computer Science Multimedia Informatics Lab. CSD Greece Orange Labs. TECH/SSTP/VMI Lannion France

ISBN: (纸本)9781615676927

In this paper we present a method based on a time-varying sinusoidal model for a robust and accurate estimation of amplitude and frequency modulations (AM-FM) in speech. The suggested approach has two main steps. First, speech is modeled as a sinusoidal model with time-varying amplitudes. Specifically, the model makes use of a first order time polynomial with complex coefficients for capturing instantaneous amplitude and frequency (phase) components. Next, the model parameters are updated by using the previously estimated instantaneous phase information. Thus, an iterative scheme for AM-FM decomposition of speech is suggested which was validated on synthetic AM-FM signals and tested on reconstruction of voiced speech signals where the signal-to-error reconstruction ratio (SERR) was used as measure. Compared to the standard sinusoidal representation, the suggested approach found to improve the corresponding SERR by 47%, resulting in over 30 dB of SERR.

关键词： Sinusoidal modeling AM-FM demodulation Speech analysis Speech reconstruction

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CHIRP RATE ESTIMATION OF SPEECH BASED ON A TIME-VARYING QUASI-HARMONIC MODEL

CHIRP RATE ESTIMATION OF SPEECH BASED ON A TIME-VARYING QUAS...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Pantazis, Yannis Rosec, Olivier Stylianou, Yannis Institute of Computer Science FORTH and Multimedia Informatics Lab. UoC Greece Orange Labs. TECH/SSTP/VMI Lannion France

ISBN: (纸本)9781424423538

The speech signal is usually considered as stationary during short analysis time intervals. Though this assumption may be sufficient in some applications, it is not valid for high-resolution speech analysis and in applications such as speech transformation and objective voice function assessment for detection of voice disorders. In speech, there are non stationary components, for instance time-varying amplitudes and frequencies, which may change quickly over short time intervals. In this paper, a previously suggested time-varying quasi-harmonic model is extended in order or to estimate the chirp rate for each sinusoidal component, thus successfully tracking fast variations in frequency and amplitude. The parameters of the model are estimated through linear Least Squares and the model accuracy is evaluated on synthetic chirp signals. Experiments on speech signals indicate that the new model is able to efficiently estimate the signal component chirp rates, providing means to develop more accurate speech models for high-quality speech transformations.

关键词： Speech modeling speech analysis non stationary analysis chirp rate f(0) evolution

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Prediction of novel precursor miRNAs using a context-sensitive Hidden Markov Model (CSHMM)

Prediction of novel precursor miRNAs using a context-sensiti...

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8th Asia-Pacific Bioinformatics Conference, APBC 2010

作者： Agarwal, Sumeet Vaz, Candida Bhattacharya, Alok Srinivasan, Ashwin Department of Physics Systems Biology Doctoral Training Centre University of Oxford Parks Road Oxford OX1 3PU United Kingdom Center for Computational Biology and Bioinformatics School of Information Technology Jawaharlal Nehru University New Delhi 110067 India School of Life Sciences Jawaharlal Nehru University New Delhi 110067 India Oxford University Computing Laboratory Wolfson Building Parks Road Oxford OX1 3QD United Kingdom IBM India Research Lab. 4-C Vasant Kunj Institutional Area Phase II Vasant Kunj New Delhi 110070 India School of Computer Science and Engineering Centre for Health Informatics University of New South Wales Sydney Australia

Background: It has been apparent in the last few years that small non coding RNAs (ncRNA) play a very significant role in biological regulation. Among these microRNAs (miRNAs), 22-23 nucleotide small regulatory RNAs, have been a major object of study as these have been found to be involved in some basic biological processes. So far about 706 miRNAs have been identified in humans alone. However, it is expected that there may be many more miRNAs encoded in the human genome. In this report, a "context-sensitive" Hidden Markov Model (CSHMM) to represent miRNA structures has been proposed and tested extensively. We also demonstrate how this model can be used in conjunction with filters as an ab initio method for miRNA identification. Results: The probabilities of the CSHMM model were estimated using known human miRNA sequences. A classifier for miRNAs based on the likelihood score of this "trained" CSHMM was evaluated by: (a) cross-validation estimates using known human sequences, (b) predictions on a dataset of known miRNAs, and (c) prediction on a dataset of non coding RNAs. The CSHMM is compared with two recently developed methods, miPred and CID-miRNA. The results suggest that the CSHMM performs better than these methods. In addition, the CSHMM was used in a pipeline that includes filters that check for the presence of EST matches and the presence of Drosha cutting sites. This pipeline was used to scan and identify potential miRNAs from the human chromosome 19. It was also used to identify novel miRNAs from small RNA sequences of human normal leukocytes obtained by the Deep sequencing (Solexa) methodology. A total of 49 and 308 novel miRNAs were predicted from chromosome 19 and from the small RNA sequences respectively Conclusion: The results suggest that the CSHMM is likely to be a useful tool for miRNA discovery either for analysis of individual sequences or for genome scan. Our pipeline, consisting of a CSHMM and filters to reduce false positives shows promise as

关键词： RNA

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Video processing techniques for traffic information acquisition using uncontrolled video streams

Video processing techniques for traffic information acquisit...

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2009 12th International IEEE Conference on Intelligent Transportation Systems, ITSC '09

作者： Loureiro, Pedro F.Q. Rossetti, Rosaldo J.F. Braga, Rodrigo A.M. Department of Informatics Engineering Artificial Intelligence and Computer Science Lab. Faculty of Engineering Rua Dr Roberto Frias S/N 4200-465 Porto Portugal

ISBN: (纸本)9781424455218

This paper reports on the first steps taken in search of a solution that uses public video streams availab.e on the Internet to address the increasing need for monitoring transportation networks with the intent of returning added value to the community, either by allowing a better understanding of the network and its needs or by feeding applications with real-time information for various purposes, such as simulation, decision-making support and updated route guidance. After the introduction of the field, we present our findings from a survey that briefly describes several works with related studies and explain the algorithms that can be adopted to get relevant information from video streams. This is followed by an analysis of the issues that may arise and the best ways to address them. Next it reports on the results achieved so far, draws some conclusions on what has been done and suggests the next steps of our research. © 2009 IEEE.

关键词： Decision making

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Mixed-initiative argumentation: A framework for justification management in clinical group decision support

Mixed-initiative argumentation: A framework for justificatio...

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2009 AAAI FAll Symposium

作者： Chang, Chee Fon Ghose, Aditya Miller, Andrew Decision Systems Lab. and Centre for Oncology Informatics School of Computer Science and Software Engg. University of Wollongong NSW Australia Centre for Oncology Informatics Graduate School of Medicine University of Wollongong NSW Australia

ISBN: (纸本)9781577354406

This paper identifies ways in which traditional approaches to argumentation can be modified to meet the needs of practical group decision support. A framework for outcome-driven decision rationale management is proposed that permits a novel conception of mixed-initiative argumentation. The framework is evaluated in the context of group decision support in medicine. Copyright © 2009, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Decision support systems

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An approach to simulate autonomous vehicles in urban traffic scenarios

An approach to simulate autonomous vehicles in urban traffic...

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2009 12th International IEEE Conference on Intelligent Transportation Systems, ITSC '09

作者： Figueiredo, Miguel C. Rossetti, Rosaldo J.F. Braga, Rodrigo A.M. Reis, Luis Paulo Department of Informatics Engineering Artificial Intelligence and Computer Science Lab. Faculty of Engineering Rua Dr. Roberto Frias S/N 4200-465 Porto Portugal

ISBN: (纸本)9781424455218

The most common cause of traffic accidents is arguably the driver error due to lack of attention. And it is very unlikely this is going to change soon thanks to increasingly cell-phone usage, in-car entertainment systems, and naturally the more frequent traffic jams in highly populated areas. Autonomous vehicles, such as driverless cars, are a promising approach to decrease traffic accidents, as well as congestions. To test this approach, simulations are a safer, more efficient, and cheaper way than live testing. This paper presents an approach to implement a simulator to test such vehicles. It includes a study of the state of the art in driverless car simulation and discusses on the specific objectives that this particular simulator aims to achieve in order to aid testing the interactions of multiple driverless cars in urban networks. © 2009 IEEE.

关键词： Multi agent systems

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Improving digital maps through GPS data processing

Improving digital maps through GPS data processing

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2009 12th International IEEE Conference on Intelligent Transportation Systems, ITSC '09

作者： Freitas, Tiago R.M. Coelho, António Rossetti, Rosaldo J.F. Department of Informatics Engineering Faculty of Engineering University of Porto Portugal INESC Porto Portugal Artificial Intelligence and Computer Science Lab. LIACC/NIAD and R Rua Dr. Roberto Frias s/n 4200-465 Porto Portugal

ISBN: (纸本)9781424455218

Personal Navigation Assistants (PNA) depend on updated digital maps for correctly positioning and route guiding users. As updating digital maps by the usual means is a highly expensive and time consuming task, GPS points gathered by existing navigation devices can be used to compare the existing real road network with the digital one. This paper describes an approach to update digital maps through the use of GPS points obtained during users' journeys as a means to identify map incongruence. Detection of new roads and roundabouts are presented with an explanation of the problem and a sample of the results. © 2009 IEEE.

关键词： Global positioning system

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Hybrid robust observers for locally Lipschitz systems 10

Hybrid robust observers for locally Lipschitz systems

引用

2009 10th European Control Conference, ECC 2009

作者： Bobtsov, Alexey A. Efimov, Denis V. Department of Control Systems and Informatics Saint-Petersburg State University of Information Technologies Mechanics and Optics Kronverksky av. 49 St-Petersburg197101 Russia CCS Lab. Institute for Problems of Mechanical Engineering Bolshoi av. 61 V.O. St. Petersburg199178 Russia Systems and Modeling Department of Electrical Engineering and Computer Science Unviersité de Liège Liege Sart-TilmanB-4000 Belgium

State observer design procedure is proposed for nonlinear locally Lipschitz systems. Possible presence of disturbances is taken into account. The solution is based on logic-based control approach applicable to nonline... 详细信息

ISBN: (纸本)9783952417393

关键词： Nonlinear systems

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Hybrid robust observers for locally Lipschitz systems

Hybrid robust observers for locally Lipschitz systems

引用

European Control Conference (ECC)

作者： Alexey A. Bobtsov Denis V. Efimov Department of Control Systems and Informatics Saint-Petersburg State University of Information Technologies Mechanics and Optics St. Petersburg Russia Systems and Control @ Systems and Modeling Department Electrical Engineering and Computer Science Belgium CCS Lab. Institute for Problems of Mechanical Engineering St. Petersburg Russia

关键词： Decision support systems Europe

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33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Holzapfel, Andre Stylianou, Yannis Institute of Computer Science FORTH Greece Multimedia Informatics Lab. Computer Science Department University of Crete

ISBN: (纸本)9781424414833

This paper introduces a new way to measure rhythmic similarity between two musical pieces using periodicity spectra. In order to detect similarity for pieces of different tempi, the linearity of the warping path between their spectra serves as a measure of their rhythmic similarity. Using a modified kNN classification approach on two datasets, the proposed measure provides comparable classification accuracy (82.1%) to the best of widely used measures (85.5%) for the first dataset;For the second dataset, which is characterized by a large variance of tempi, the proposed measure outperforms all reference measures, reaching an accuracy of 69.0%, while the best of the other measures reaches 53.8%. Moreover, the presented technique works fully automatically, and no information regarding tempo is needed.

关键词： rhythm similarity music information retrieval

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