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检索条件"主题词=spectrum coding"
16 条 记 录,以下是1-10 订阅
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Time evolution in LPC spectrum coding
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IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING 2004年 第3期12卷 290-301页
作者: Nordén, F Eriksson, T Aalborg Univ Dept Commun Technol DK-9220 Aalborg Denmark Chalmers Univ Technol Dept Signals & Syst S-41296 Gothenburg Sweden
Many current speech coders use a source-filter model in which the signal is decomposed on a frame-wise basis into an excitation component and a filter component. The filter component is then parameterized and coded by... 详细信息
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Memory-based vector quantization of LSF parameters by a power series approximation
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IEEE TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING 2007年 第4期15卷 1146-1155页
作者: Eriksson, Thomas Norden, Fredrik Chalmers Dept Signals & Syst S-41296 Gothenburg Sweden Imego AB S-41133 Gothenburg Sweden
In this paper, memory-based quantization is studied in detail. We propose a new framework, power series quantization (PSQ), for memory-based quantization. With linear spectral frequency (LSF) quantization as the appli... 详细信息
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A hybrid spreading/despreading function with good SNR performance for band-limited DS-CDMA
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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 1996年 第8期14卷 1576-1582页
作者: Yu, L Salt, JE TELECOMMUN RES LABS SASKATOONSK S7N 0W0CANADA
The efficiency of a direct-sequence spread-spectrum code-division multiple-access (DS-CDMA) system depends heavily on the shape of the spectrum of the spread signal. Maximum efficiency is obtained with an ideal brick-... 详细信息
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Channel optimized predictive vector quantization
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IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING 2000年 第4期8卷 370-384页
作者: Lindén, J Chalmers Univ Technol Dept Signals & Syst SE-41296 Gothenburg Sweden
The objective of this work is to investigate how channel optimization techniques ran be applied to predictive vector quantizers. In particular, an efficient encoder search procedure and two design methods are derived.... 详细信息
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Bounded support Gaussian mixture modeling of speech spectra
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IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING 2003年 第1期11卷 88-99页
作者: Lindblom, J Samuelsson, J Chalmers Univ Technol Informat Theory Grp Gothenburg Sweden
Lately, Gaussian mixture (GM) models have found new applications in speech processing, and particularly in speech coding. This paper provides a review of GM based quantization and prediction. The main contribution is ... 详细信息
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LIMITS TO THE ENcoding AND BOUNDS ON THE PERFORMANCE OF COHERENT ULTRASHORT LIGHT-PULSE CODE-DIVISION MULTIPLE-ACCESS SYSTEMS
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IEEE TRANSACTIONS ON COMMUNICATIONS 1992年 第2期40卷 325-336页
作者: HAJELA, DJ SALEHI, JA BELL COMMUN RES INC DIV SYST PRINCIPLES RESMORRISTOWNNJ
In this paper we obtain lower and upper bounds on the peak intensity of a spectrally phase encoded ultrashort light pulse as a function of the length of spectral phase encoding. We show that using random phase codes f... 详细信息
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Power Series Quantization for Noisy Channels
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IEEE TRANSACTIONS ON COMMUNICATIONS 2010年 第5期58卷 1405-1414页
作者: Persson, Daniel Eriksson, Thomas Linkoping Univ Dept Elect Engn S-58183 Linkoping Sweden Chalmers Univ Technol Dept Signals & Syst S-41296 Gothenburg Sweden
A recently proposed method for transmission of correlated sources under noise-free conditions, power series quantization (PSQ), uses a separate linear or nonlinear predictor for each quantizer region, and has shown to... 详细信息
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Interframe LSF quantization for noisy channels
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IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING 1999年 第5期7卷 495-509页
作者: Eriksson, T Lindén, J Skoglund, J Chalmers Univ Technol Dept Informat Theory SE-41296 Gothenburg Sweden
In linear predictive speech coding algorithms, transmission of linear predictive coding (LPC) parameters-often transformed to the line spectrum frequencies (LSF) representation-consumes' a large part of the total ... 详细信息
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Integrated optical micromachined pressure sensor with spectrally encoded output and temperature compensation
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APPLIED OPTICS 1998年 第15期37卷 3264-3267页
作者: De Brabander, GN Beheim, G Boyd, JT Univ Cincinnati Dept Elect & Comp Engn & Comp Sci Cincinnati OH 45221 USA
A promising type of optical pressure sensor combines an integrated optical interferometer with a micro-machined diaphragm on a shared silicon substrate. We have demonstrated a sensor of this type that uses an unbalanc... 详细信息
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Spectral encoding of the polarization state of light in multiplexed polarization-sensitive lasing structures
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OPTICS LETTERS 2004年 第12期29卷 1309-1311页
作者: Brasselet, E Wright, D Zyss, J Langer, G Kern, W Ecole Normale Super Lab Photon Quant & Mol F-94235 Cachan France Graz Tech Univ Inst Chem Technol Organ Stoffe A-8010 Graz Austria
We report the experimental demonstration of spectral encoding of the polarization state of light by use of multiplexed distributed-feedback lasers in a dye-doped organic thin film by exploiting the pump polarization s... 详细信息
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