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检索条件"主题词=Linear predictive coding"

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Development of Helicopters Sound Detection Systems

Development of Helicopters Sound Detection Systems

引用

National Conference on Radio Science (NSRC)

作者： Hassan Fahmy Hashem Abbas Amin Alexandria Higher Institute of Engineering and Technology Egypt

The presence of a background noise in the helicopter's sound signals can cause un-acceptance degradation in the detection of the performance method. The recent detection method uses artificial neural networks (ANNs), in combination with parametric spectral representation techniques to detect these targets. The feature encoding techniques based on linear prediction coefficients (LPC) have been applied to obtain spectral estimate of the acoustic signals. This paper investigates preprocessing of signal enhancement prior to feature extraction using different wavelet transform functions

关键词： Helicopters Artificial neural networks Feature extraction Pattern classification Acoustic signal detection linear predictive coding Acoustic noise Noise reduction Acoustical engineering Wavelet transforms

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Controlling spectral dynamics in LPC quantization for perceptual enhancement

Controlling spectral dynamics in LPC quantization for percep...

引用

Asilomar Conference on Signals, Systems & Computers

作者： J. Samuelsson J. Skoglund J. Linden Department of Information Theory Chalmers University of Technology Gothenburg Sweden

Taking the evolution of spectral parameters into consideration in speech coding has been shown to enhance the perceptual performance. In this study we examine and compare two methods that are designed for explicit control of spectral dynamics. One method operates on the encoder part of the coding system by incorporating a constraint in the distortion measure and the other method smoothes the trajectory of output vectors at the decoder side. The decoder method requires however an additional coding delay of one frame. By means of listening experiments it is demonstrated for three different vector quantizer structures that especially the decoder method gives significant improvements. For noisy channels, the preference for this method is even more emphasized.

关键词： linear predictive coding Quantization Decoding Vectors Speech coding Design methodology Distortion measurement Testing Information theory Added delay

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Classification of wheeled military vehicles using neural networks

Classification of wheeled military vehicles using neural net...

引用

IEEE International Conference on Systems Engineering

作者： J. Jackowski R. Wantoch-Rekowski Institute of Mechanical Vehicles Military University of Technology Warsaw Poland Institute of Computer Science Military University of Technology Warsaw Poland

The problem of using neural networks for military vehicle classification on the basis of ground vibration is presented in this paper. One of the main elements of the system is unit called geophone. This unit allows to measure ground vibrations in each direction for certain period of time. The value of amplitude is used to fix LPC values of each vehicle. Because the multilayer perceptron is used, the learning set has to be prepared. Please find attached the results of using neural network such as: example of learning, validation and test sets, structure of the networks and learning algorithm, learning and testing results.

关键词： Neural networks Multi-layer neural network linear predictive coding Military computing Signal processing Mathematical model Land vehicles Road vehicles predictive models Electronic mail

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Role of multi-pulse excitation in synthesis of natural-sounding voiced speech

Role of multi-pulse excitation in synthesis of natural-sound...

引用

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

作者： B. Caspers B. Atal Acoustics Research Department AT and T Bell Laboratories Inc. Murray Hill NJ USA

We discuss in this paper the role of multi-pulse excitation and its importance in the synthesis of natural-sounding voiced speech. In an earlier study, Atal and David reported on the relative importance of spectral and phase properties of LPC excitation on the subjective quality of synthetic speech. This paper extends the results of Atal and David to the multi-pulse excitation. The multi-pulse analysis procedure determines the excitation by a closed-loop matching procedure which minimizes the perceptual difference between the original and synthetic speech signals. However, even for periodic voiced speech, the secondary pulses in the multi-pulse excitation do not vary systematically from one pitch period to another. We find that the multi-pulse excitation is highly periodic in the lower frequency bands and much less periodic in the higher bands. We suggest, that this irregularity contributes to the "fullness" heard in multi-pulse synthesized speech. We have investigated the influence on speech quality of replacing the original multi-pulse patterns in the excitation with a fixed multi-pulse pattern selected randomly from the multi-pulse excitation of a voiced speech segment. Our results suggest that the fixed multi-pulse patterns introduce only small degradations in synthetic speech.

关键词： Speech synthesis linear predictive coding Speech analysis Degradation Acoustics Signal analysis Frequency Vocoders Power harmonic filters Delay

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LPC Prediction Error Combined with LSB Steganography for Blind Speech Authentication

LPC Prediction Error Combined with LSB Steganography for Bli...

引用

IEEE Workshop on Multimedia Signal Processing

作者： Chai Peiqi Liu Jingyong Pei Dingyu Yang Zhiqiang Department of Computer Science University of Tongji Shanghai China

In this paper, we propose a new blind speech authentication method to verify the authenticity and integrity of speech. In this method, linear predictive coding (LPC) and least significant bit (LSB) steganography are combined, using LPC prediction error (LPCPE) as invariable features of speech and inserting these features into least significant bits of speech samples. When verifying the speech, we extract the inserted features, and compare them with recalculated LPCPE. Experimental results show that this method can detect not only the tampering in speech but also the position and region of the tampering

关键词： linear predictive coding Steganography Authentication Watermarking Speech coding Speech analysis Speech enhancement Computer errors Protection Speech synthesis

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Feature selection through orthogonal expansion in isolated word recognition

Feature selection through orthogonal expansion in isolated w...

引用

Mediterranean Electrotechnical Conference (MELECON)

作者： E. Lleida C. Nadeu J.B. Marino ńDpto. Teoria de la Sefial y Comunicaciones Universidad Politecnica de Cataluna Barcelona Spain Dpto. Teoria de la Senal y Commun. Univ. Politecnica de Cataluna Barcelona Spain

The use of an orthogonal expansion for feature selection and data compression in isolated word recognition is presented. Assuming that the spectral evolution, given by a LPC analysis, is a noisy measure in the sense that it is a linear combination of a set of real features, the objective of the orthogonal expansion is to find these real features. The new feature vectors are used to perform the recognition process. The recognition results as well as the meaning of the orthogonal expansion are discussed.< >

关键词： linear predictive coding Pattern recognition Speech processing Signal processing Sampling methods Vector quantization Speech recognition Vocabulary Ambient intelligence Testing

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Hidden Markov models applied to very low bit rate speech coding

Hidden Markov models applied to very low bit rate speech cod...

引用

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

作者： E. Farges M. Clements School of Electrical Engineering Georgia Institute of Technology Atlanta GA USA

A new type of very low bit rate speech coder based on a global Discrete Hidden Markov Model (DHMM) of continuous speech for a single speaker is presented here. Several important issues of the training, coding, and decoding procedures are discussed for a 64-state, 1024-observation model. Such a framework is useful in reducing the redundancy in a 10-bit classical Vector Quantizer (VQ), and could lead to a DHMM coder with a bit rate comparable to that of a Segment Vocoder (SV) or a Matrix Quantizer (MQ). This is achieved not only by modelling the long term non-stationarity and the inter-frame time dependencies of the speech, but also by efficiently representing a different kind of information such as vocal tract structure and linguistic patterns.

关键词： Hidden Markov models Bit rate Speech coding Random variables Stochastic processes linear predictive coding Decoding Vocoders Automatic speech recognition Human voice

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Implementation of high order recursive filters as sub-filters

Implementation of high order recursive filters as sub-filter...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： M.B. Sandler Department of Electronic & Electrical Engineering King's College University of London london UK

A new technique for partitioning high-order recursive digital filters is described, and some examples are presented of its application to all-pole systems, which, although not of very high order, exhibit the basic problems of high-order systems, i.e., many poles in close proximity. The key element is the incomplete partial fraction expansion (IPFE) which enables a rational polynomial to be split into the sum of two or more rational polynomials. It is shown that for tame problems when conventional parallel and cascade spectra could be found, the IPFE implementation behaves similarly to them. When the problem becomes less tame, it is difficult to demonstrate inconvertably that the PIFE method works.< >

关键词： Polynomials Psychoacoustic models Nonlinear filters linear predictive coding Digital filters Dynamic range Resonator filters Instruments Resonance IIR filters

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An improved isolation word recognition system based upon the linear prediction residual

An improved isolation word recognition system based upon the...

引用

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

作者： M. Coker S. Boll ESL Inc. Sunnyvale CA USA University of Utah Salt Lake UT USA

The linear prediction residual has been shown to be an effective technique for isolated word recognition. This paper develops a new spectral interpretation of this method for waveform matching, describes how the accuracy of such a system can be increased by training on multiple repetitions of the reference vocabulary, and how both the reference parameter storage requirements and computation rate can be reduced in half by omitting redundant speech information. Results of experiments vary from a low of 88% when the vocabulary consisted of 25 pairs of rhyming words differing only by the initial consonant sound, to a high of 98.1% when the vocabulary consisted of 107 flight commands having an average of two syllables per word.

关键词： linear predictive coding Vocabulary Pattern recognition Least squares approximation Equations Speech recognition Impedance matching Particle measurements linear systems Production systems

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Vocal tract area based formant tracking using particle filter

Vocal tract area based formant tracking using particle filte...

引用

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

作者： Kaustubh Kalgaonkar Mark Clements School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

This paper presents a novel method for estimating formant frequencies and bandwidths based on an underlying vocal tract model. A novel statistical model for vocal tract cross-sectional areas is developed which allows computation of full likelihood functions. Modifications to the basic particle filter algorithm have also been developed to help combat both diversity depletion and convergence problems. The performance of the method is evaluated against hand labeled formant database (L. Deng et al., 2003).

关键词： Particle tracking Particle filters Random variables Frequency estimation Resonance linear predictive coding Bandwidth Filtering State-space methods Speech analysis

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