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检索条件"主题词=linear predictive coding"

共 2456 条记录，以下是311-320 订阅

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Embedded transform coding of audio signals by model-based bit plane coding

Embedded transform coding of audio signals by model-based bi...

引用

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

作者： Thi Minh Nguyet Hoang Marie Oger Stephane Ragot Marc Antonini France Télécom Research and Development TECH/SSTP/RVA Lannion France France Télécom R&D/TECH/SSTP Lannion Cedex Lab. I3S-UMR 6070 CNRS and Univ. of Nice Sophia Antipolis Sophia Antipolis France

This paper proposes a new model-based method for transform coding of audio signals. The input signal is mapped in "perceptual" domain by linear-predictive weighting filter followed by modified discrete cosine transform (MDCT). To provide bitstream scalability, model-based bit plane coding is then applied with respect to the mean square error (MSE) criterion. We present methods to estimate the symbol probability in bit planes assuming a generalized Gaussian model for the distribution of MDCT coefficients. We compare the performance of the proposed bitstream scalable coder with stack-run coding and ITU-T G.722.1. Objective and subjective quality results are presented. The proposed coder is equivalent to or slightly worse than reference coders, but presents the nice advantage of being scalable. Performance penalty due to bitstream scalability is evident at low bitrates.

关键词： Transform coding Filters Quantization linear predictive coding Mean square error methods Scalability Bit rate Audio coding Speech coding Image coding

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A rerceptual weighting filter on cepstrum domain for wideband speech codecs

A rerceptual weighting filter on cepstrum domain for wideban...

引用

International Conference on Communication Technology (ICCT)

作者： Feng-lian Li Xue-ying Zhang College of Information Engineering Taiyuan University of Technology Taiyuan Shanxi China

A novel perceptual weighting filter for improving the perceptual quality of wideband speech codecs (such as ITU-T G.722.2 Adaptive Multi-rate Wideband codec AMR-WB) is *** perceptual processing is based on the cepstral difference of ISP multiplied-polynomial cepstrum and LPC cepstral coefficients. The paper introduces the concepts of ISP pseudo-cepstrum, deduces the ISP pseudo-cepstrum and ISP multiplied-polynomial *** spectral tilt is more pronounced in wideband signals due to the wide dynamic range between low and high frequencies. The proposed filter significantly compensates the spectral tilt of wideband signals that codec does not require an additional tilt compensation as traditional *** frequency response of proposed perceptual weighting filter is consistent with the auditory masking theory. Simulation results indicate that the objective assessment scores obtained using wideband Perceptual Evaluation of Speech Quality (w-PESQ) can be improved significantly by the proposed method.

关键词： Cepstrum Wideband Speech codecs Cepstral analysis Filtering theory Adaptive filters linear predictive coding Dynamic range Frequency response Speech analysis

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Development of a novel voice verification system using wavelets

Development of a novel voice verification system using wavel...

引用

International Conference on Computer and Communication Engineering, ICCCE

作者： Rajparthiban Kumar C.V. Aravind Kanendra Naidu Anis Fariza Engineering Architecture and Built Environment University College Sedaya International Cheras Malaysia

This paper presents a novel voice verification system using wavelet transforms. The conventional signal processing techniques assume the signal to be stationary and are ineffective in recognizing non stationary signals such as the voice signals. Voice signals which are more dynamic could be analyzed with far better accuracy using wavelet transform. The developed voice recognition system is word dependant voice verification system combining the RASTA and LPC. The voice signal is filtered using the special purpose voice signal filter using the relative spectral algorithm (RASTA). The signals are de-noised and decomposed to derive the wavelet coefficients and thereby a statistical computation is carried out. Further the formant or the resonance of the voices signal is detected using the linear predictive coding (LPC). With the statistical computation on the coefficients alone, the accuracy of the verifying sample individual voice to his own voice is quite high (around 75% to 80%). The reliability of the signal verification is strengthened by combining entailments from these two completely different aspects of the individual voice. For voice comparison purposes four out five individuals are verified and the results show higher percentage of accuracy. The accuracy of the system can be improved by incorporating advanced pattern recognition techniques such as hidden Markov model (HMM).

关键词： Signal processing linear predictive coding Wavelet transforms Speech recognition Hidden Markov models Signal analysis Speech analysis Wavelet analysis Filters Signal processing algorithms

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On the theoretical limit of the lightweight of passenger cars based upon the core of Industrial Engineering on eliminating clean ineffective work

On the theoretical limit of the lightweight of passenger car...

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International Conference on Management Science and Engineering (ICMSE)

作者： Hai-dong Liu Guo-liang Liu Jilin University Changchun Jilin CN Sch. of Manage. Jilin Univ. Jilin

Based upon the core of Industrial Engineering (IE) on eliminating clean ineffective work (ECIW) together with Automobile operational equation (AOE), the theoretical limit of the effective curb mass of passenger car (TLECMPC), two ways for solving TLECMPC, the ratio of the effective curb mass of passenger car (RECMPC) and the ratio of the ineffective curb mass of passenger cars (RICMPC) have been advanced for the first time in this paper. And then the theoretical lightweight limit of passenger cars (TLLPC) and the theoretical limit of fuel saving of passenger cars (TLFSPC) relative to TLLPC have been presented in this paper. The case in this paper indicates that as to H original passenger car with 1300 (Kg) curb mass, its RICMPC is 62.15% high, its TLLPC is 808 (Kg) high and its TLFSPC is 3(L/100 Km).

关键词： Industrial engineering Fuels Automobiles Conference management Technology management Engineering management Equations linear predictive coding Aluminum alloys Petroleum

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Mandarin Stops Classification Based on Random Forest Approach

Mandarin Stops Classification Based on Random Forest Approac...

引用

International Symposium on Chinese Spoken Language Processing

作者： Chi-Yueh Lin Hsiao-Chuan Wang Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9781424429424

The non-stationary behavior makes stops classification one of worthy examining subject in the speech community. Over several decades, many researchers have sorted out a list of acoustic properties that are useful to identify a stop. In this paper, we extract features that are sufficient to represent the important acoustic properties of stops, like statistic moments of the burst spectrum. In combining a recent developed learning approach, the random forest, we conduct a 6-way classification task to classify Mandarin stops. After a series of bootstrap trials, experimental results demonstrate the superior performance of random forest on the stop classification task over some well-known approaches.

关键词： Speech Natural languages Feature extraction Gravity linear predictive coding Statistics Transient analysis Shape Signal to noise ratio Background noise

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Maximization of system lifetime in body sensor networks

Maximization of system lifetime in body sensor networks

引用

International Conference on Electrical and Computer Engineering (ICECE)

作者： Md. Nazrul Islam Mondal Kazi Mohiuddin Ahmed Department of Computer Science & Engineering Faculty of Electrical & Computer Engineering Rajshahi University of Engineering and Technology Bangladesh Department of Telecommunications School of Engineering & Technology Asian Institute of Technology Bangkok Thailand

In this paper, the target is to reduce the energy consumption in the body sensor network as well as maximize the system lifetime of sensor nodes when they will make communication among body sensors and personal communication unit. The best compression technique like LPC is selected for energy saving based on some calculations. Formulation of a linear programming problem where is to maximize the system lifetime which is equivalent to the time until the first node runs out of battery. Maximum system lifetimes are calculated by MATLAB optimization technique using and without using efficient compression algorithm like LPC in various environments. The results show that maximum system lifetimes calculated in different scenarios using efficient compression technique like LPC is better than without using compression technique.

关键词： Body sensor networks linear predictive coding Power engineering and energy linear programming Batteries Wireless sensor networks Computer networks Energy consumption Sensor systems Compression algorithms

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Novel End-to-End Voice Encryption Method in GSM System

Novel End-to-End Voice Encryption Method in GSM System

引用

IEEE International Conference on Networking, Sensing and Control

作者： H.F. Qi X.H. Yang R. Jiang B. Liang S.J. Zhou School of Information Science & Engineering South-East University Nanjing China Southeast University Nanjing China

For the GSM security mechanism cannot assure end-to-end secure communications, this paper presents a novel voice encryption method based on current voice channel, which overcomes data channel's shortages and solves the problem of voice encryption penetrating the RPE-LTP vocoder. The proposed method realizes the end-to-end secure communications in the GSM system with short time delay, good compatibility to all GSM networks, and easy implementation without any modification in current GSM signaling system.

关键词： Cryptography GSM Communication system security Mobile communication Vocoders linear predictive coding Finite impulse response filter Communication system signaling Automatic repeat request Delay

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A 53% high efficiency GaAs vertically integrated multi-junction laser power converter

A 53% high efficiency GaAs vertically integrated multi-junct...

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IEEE Photonics Conference (IPC)

作者： R. Sudharsanan D. Krut T. Isshiki H. Cotal S. Mesropian A. Masalykin N.H. Karam Boeing Company Spectrolab Inc. Sylmar CA USA

Summary form only given. Power-by-light schemes to provide electrical power to remote opto-electronic modules typically involve the use of multi-segmented photovoltaic (PV) cells or commonly known as laser power converters (LPC) illuminated by an optical fiber to produce output voltages between 2 and 12 volts, with up to several hundred milliwatts of electrical power. Typically these photovoltaic devices are based on a GaAs single junction cell grown on semi-insulating GaAs substrates and they are further segmented and connected in series depending on the output voltage required. Theoretically, these cells should have efficiencies near 60% but currently these cells have efficiencies only in the range of 40 to 45%. Optical losses due to high grid metal coverage and cell isolation trench can reduce efficiency by nearly 10%. In order to eliminate the losses in the multi-segmented cells and to improve the efficiencies further we have designed a vertical multi junction device. The vertical multi-junction approach has several advantages over the multi- segmented approach. The advantages are; a) reduction in optical losses due to trench formation, b) lower metal obscuration losses, due to lower current density in the device, c) reduction of sheet conduction losses, and d) simple process to fabricate the devices. We have successfully designed and fabricated a new vertical multi-junction TV laser power converter with an efficiency of over 53%, a considerably higher efficiency than the regular multi-segmented 2V GaAs laser power converter and this is the highest efficiency reported so far for a photovoltaic device.

关键词： Gallium arsenide Power lasers Optical losses Photovoltaic systems Solar power generation Fiber lasers Voltage linear predictive coding Optical fibers Optical devices

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Analysis-by-synthesis method for whisper-speech reconstruction

Analysis-by-synthesis method for whisper-speech reconstructi...

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： Farzaneh Ahmadi Ian Vince McLoughlin Hamid Reza Sharifzadeh School of Computer Engineering Nanyang Technological University Singapore

In the following paper, a method for the real-time conversion of whispers to normal phonated speech through a code excited linear prediction analysis-by-synthesis codec is discussed. This approach uses a template of a speakerpsilas normal phonated speech for extraction of excitation parameters such as pitch and gain, and then injects these estimated excitations into whispered signal to synthesize normal-sounding speech through the CELP codec. Furthermore, since restoring pitch to whispered speech requires some considerations of quality and accuracy, spectral enhancements are required in terms of formant shifting (LSPs modification) and pitch injection based on voiced/unvoiced decision. Spectral shifting is accomplished through line-spectral pair adjustment. Implementing such methods by using the popular CELP codec allows integration of the technique with any modern speech applications and devices. Subjective testing results are presented to determine the effectiveness of the technique.

关键词： Speech synthesis Speech analysis Speech codecs Filters Speech coding Books Paper technology linear predictive coding Speech enhancement Testing

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Least squares-adapted edge-look-ahead prediction with run-length encodings for lossless compression of images

Least squares-adapted edge-look-ahead prediction with run-le...

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

作者： Lih-Jen Kau Yuan-Pei Lin Department Elec. and Control Engineering National Chiao Tung University Hsinchu Taiwan

Many coding methods are more efficient with certain types of images than others. In particular, run-length coding is very useful for coding areas of little changes. Adaptive predictive coding achieves high coding efficiency for fast changing areas like edges. In this paper, we propose a switching coding scheme that will combine the advantages of both run-length and adaptive linear predictive coding (RALP) for lossless compression of images. For pixels in slowly varying areas, run-length coding is used; otherwise LS (least square)-adapted predictive coding is used. Instead of performing LS adaptation in a pixel-by-pixel manner, we adapt the predictor coefficients only when an edge is detected so that the computational complexity can be significantly reduced. For this, we propose an edge detector using only causal pixels. This way, the predictor can look ahead if the coding pixel is around an edge and initiate the LS adaptation in advance to prevent the occurrence of a large prediction error. With the proposed switching structure, very good prediction results can be obtained in both slowly varying areas and pixels around boundaries as we will see in the experiments.

关键词： Image coding Image edge detection Computational complexity predictive coding Encoding linear predictive coding Detectors Bit rate Biomedical imaging Remote sensing

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