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single-channel Speech Enhancement Using Critical-Band Rate Scale Based Improved Multi-Band Spectral Subtraction

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Journal of Signal and Information Processing 2013年第3期4卷 314-326页

作者： Navneet Upadhyay Abhijit Karmakar Department of Electrical & Electronics Engineering Birla Institute of Technology & Science Pilani India

This paper addresses the problem of single-channel speech enhancement in the adverse environment. The critical-band rate scale based on improved multi-band spectral subtraction is investigated in this study for enhancement of single-channel speech. In this work, the whole speech spectrum is divided into different non-uniformly spaced frequency bands in accordance with the critical-band rate scale of the psycho-acoustic model and the spectral over-subtraction is carried-out separately in each band. In addition, for the estimation of the noise from each band, the adaptive noise estimation approach is used and does not require explicit speech silence detection. The noise is estimated and updated by adaptively smoothing the noisy signal power in each band. The smoothing parameter is controlled by a-posteriori signal-to-noise ratio (SNR). For the performance analysis of the proposed algorithm, the objective measures, such as, SNR, segmental SNR, and perceptual evaluations of the speech quality are conducted for the variety of noises at different levels of SNRs. The speech spectrogram and objective evaluations of the proposed algorithm are compared with other standard speech enhancement algorithms and proved that the musical structure of the remnant noise and background noise is better suppressed by the proposed algorithm.

关键词： single-channel Speech Enhancement Critical-Band Rate Scale Spectral Over-Subtraction Adaptive Noise Estimation Objective Measure Speech Spectrograms

single-channel Compressive Sensing for DOA Estimation via Sensing Model Optimization

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International Journal of Communications, Network and System Sciences 2017年第5期10卷 191-201页

作者： Hongtao Li Zeshi Yuan Nanjing University of Science and Technology Nanjing China

The performance of multi-channel Compressive Sensing (CS)-based Direction-of-Arrival (DOA) estimation algorithm degrades when the gains between Radio Frequency (RF) channels are inconsistent, and when target angle information mismatches with system sensing model. To solve these problems, a novel single-channel CS-based DOA estimation algorithm via sensing model optimization is proposed. Firstly, a DOA sparse sensing model using single-channel array considering the sensing model mismatch is established. Secondly, a new single-channel CS-based DOA estimation algorithm is presented. The basic idea behind the proposed algorithm is to iteratively solve two CS optimizations with respect to target angle information vector and sensing model quantization error vector, respectively. In addition, it avoids the loss of DOA estimation performance caused by the inconsistent gain between RF channels. Finally, simulation results are presented to verify the efficacy of the proposed algorithm.

关键词： Compressive Sensing Direction-of-Arrival Estimation single-channel Mismatching Error

single-channel PCNL术后残石的处理

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Single-channel PCNL术后残石的处理

作者：闻斌重庆医科大学

学位级别：硕士

目的：分析single-channel PCNL术后残石形成的高风险因素，以改进手术技巧，降低术后残石率。方法：整理分析我院262例行single-channel PCNL术患者的临床资料（2011年6月至2013年12月），分类总结术后残石成因。结果：实施手术262例，... 详细信息

目的：分析single-channel PCNL术后残石形成的高风险因素，以改进手术技巧，降低术后残石率。方法：整理分析我院262例行single-channel PCNL术患者的临床资料（2011年6月至2013年12月），分类总结术后残石成因。结果：实施手术262例，16%（42例）一期术后残石。21例系复杂类型结石，7例与术中出血等并发症有关，7例因结石体积过大，碎石过程中结石散落导致，3例与肾内集合系统解剖异常有关，3例系术式特点受限，术者操作不熟练所致1例。结论：single-channel PCNL术后残石形成的高风险因素主要是结石复杂、结石大体积以及出血影响，变异的肾内集合系统、术式缺陷及术者操作不熟练也有一定的关系。术前完善的影像学检查，合理优化的手术设计，术中精准娴熟的手术操作以及避免出血等并发症的发生，能最大限度减少一期术后残石率，提升手术效果。

关键词： single-channel PCNL 术后残石

Blind separation of the single-channel mixed signal Based on BICM-ID

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Blind separation of the single-channel mixed signal Based on...

Fine single channel Identification Controlled by Sedimentary Facies—Taking KLA Oilfield as an Example

2012 IEEE International Conference on Computer Science and Automation Engineering（CSAE 2012）

作者： Zhang Dong-ling Xu Yi-qiong Zhang Jun Ge Lin-dong National Digital Switching System Engineering & Technological Research Center Zhengzhou 450002 china

The paper focuses on blind separation of the single-channel mixed signal which is an important and touchy issue in uncooperative *** algorithm based on bit-interleaved code modulation iterative decoder （BICM-ID） scheme is proposed in the paper which joints demapping and decoding and can recover multi-path source signals from a single-channel mixed *** new algorithm for demapping of mixed signals is provided based on theoretical analysis and mathematical *** analysis and simulation results show that the local algorithm can directly recover all the source signals from a single-channel mixed signal without separating the mixed *** advantages of the algorithm are low computational complexity,lower BER for both non-ISI,ISI AWGN channels,and suitable for the situations of equivalent as well as non-equivalent power mixed signals.

关键词： blind separation single-channel BICM-ID Paired Carrier Multiple Access (PCMA)

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Open Journal of Geology 2022年第3期12卷 188-198页

作者： Shaopeng Wang Pengfei Mu Qiongyuan Wu Meijia Liu Xuefang Zhang Tianjin Branch of CNOOC Ltd. Tianjin China

The Neogene fluvial reservoir in the Bohai oilfield is one of the leading development horizons for increasing reserves and production in the Bohai oilfield. However, the development of offshore fluvial reservoirs is faced with the problems of thin reservoir thickness, narrow plane width, rapid lateral change, and thin well pattern. Taking the KLA oilfield as an example, this paper discusses the nuanced characterization and configuration of a single channel controlled by sedimentary facies to guide developing offshore river facies’ narrow channel main control oilfield. Firstly, based on a large number of core data, the acceptable sedimentary facies identification is realized, the sedimentary model of the study area is established, the delicate calibration of logging facies and seismic facies is realized under the constraint of the sedimentary model, and a set of technical methods for nuanced reservoir characterization guided by seismic sedimentology is summarized, to realize the boundary identification of composite channel configuration and further realize the nuanced characterization of the single narrow channel. Based on this set of technology, it guides the smooth implementation of horizontal wells in the oilfield. The drilling encounter rate of the reservoir in the horizontal section of the single well exceeds 90%, ensuring the injection production connectivity and increasing the reserve production rate by more than 10%.

关键词： Sedimentary Facies Control single-channel Reservoir Characterization Cost Reduction Efficiency Increase

Detection of the urban heat island in Beijing using HJ-1B satellite imagery

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Science China Earth Sciences 2010年第S1期53卷 67-73页

作者： YANG Jun1,GONG Peng2,ZHOU JinXing3,HUANG HuaBing2 & WANG Lei2 1 Key Laboratory of Silviculture and Conservation,Ministry of Education,Beijing Forestry University,Beijing 100083,China 2 State Key Laboratory of Remote Sensing Science,jointly sponsored by the Institute of Remote Sensing Applications,Chinese Academy of Sciences and Beijing Normal University,Beijing 100101,China 3 Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091 China 1. Key Laboratory of Silviculture and Conservation Ministry of Education Beijing Forestry University Beijing 100083 China2. State Key Laboratory of Remote Sensing Science jointly sponsored by the Institute of Remote Sensing Applications Chinese Academy of Sciences and Beijing Normal University Beijing 100101 China3. Institute of Desertification Studies Chinese Academy of Forestry Beijing 100091 China

Satellite images are used extensively in studying the urban heat island(UHI) *** evaluated the suitability of thermal infrared(TIR) data from the HJ-1B satellite for detecting UHI using a case study in *** modified algorithms for retrieving the land surface temperature(LST) from HJ-1B data were *** results were compared with LST images derived from a Landsat TM thermal band and the MODIS LST *** spatial pattern of UHI generated using HJ-1B data matched well with that produced using TM and MODIS *** the two algorithms,the mono-window algorithm performed better but further tests are *** more frequent coverage than TM and higher spatial resolution than MODIS,the HJ-1B TIR data present a unique opportunity to study thermal environments in cities in China and neighboring countries.

关键词： surface temperature NDVI mono-window algorithm single-channel algorithm

Cation Selectivity of channels Formed at Planar Lipid Bilayer by Pinellia ternata Lectin

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Science China Chemistry 1994年第5期37卷 547-556页

作者：张辉施玉醻 Shanghai Institute of Physiology Academia Sinica Shanghai 200031 PRC

By means of the two-compartment system. PTL-channels, the first lectin channels formed on planar lipid bilayers by Pinellia ternata lectin (PTL) have been studied. The results show (i) PTL-channels are voltage-independent and have apparent subunits; (ii) in 50 mmol/L KC1 and 25 mmol/L BaCl2 solutions, a single channel has unit conductance of 21 pS and 42 pS, respectively; (iii) the channel exhibits a slightly higher permeability to divalent than monovalent cation (PBa/PK=4.1), and (iv) the selectivity among divalent or monovalent cations is poor. The cation selectivity sequence for the channel will follow PBa(7. 0)-Psr (6. 4)~PMg(6. 4)>PK(1. 7)>PN.(1. 0)~PLi(l. 0).Moreover, these data also give explanation to the facilitatory action of PTL on the release of acetyl-choline from motor nerve terminals.

关键词： Pinellia ternata Briet lectin lipid bilayer single-channel recording cation selectivity.

A novel SSA-CCA framework for muscle artifact removal from ambulatory EEG

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Virtual Reality & Intelligent Hardware 2022年第1期4卷 1-21页

作者： Yuheng FENG Qingze LIU Aiping LIU Ruobing QIAN Xun CHEN School of Information Science and Technology University of Science and Technology of ChinaHefei 230026China Epilepsy Center Department of NeurosurgeryThe First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China

Background Electroencephalography(EEG)has gained popularity in various types of biomedical applications as a signal source that can be easily acquired and conveniently ***,owing to a complex scalp electrical environment,EEG is often polluted by diverse artifacts,with electromyography artifacts being the most difficult to *** particular,for ambulatory EEG devices with a restricted number of channels,dealing with muscle artifacts is a *** In this study,we propose a simple but effective novel scheme that combines singular spectrum analysis(SSA)and canonical correlation analysis(CCA)algorithms for single-channel problems and then extend it to a few channel case by adding additional combining and dividing operations to *** We evaluated our proposed framework on both semi-simulated and real-life data and compared it with some state-of-the art *** results demonstrate this novel framework's superior performance in both single-channel and few-channel *** This promising approach,based on its effectiveness and low time cost,is suitable for real-world biomedical signal processing applications.

关键词： EEG single-channel Few-channel EMGartifacts SSA CCA

Blind-restoration-based blind separation method for permuted motion blurred images

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Journal of Shanghai University(English Edition) 2011年第2期15卷 79-84页

作者：方勇王伟 Key Laboratory of Specialty Fiber Optics and Optical Access Networks School of Communication and Information Engineering Shanghai University

A novel single-channel blind separation algorithm for permuted motion blurred images is proposed by using blind restoration in this paper. Both the motion direction and the length of the point spread function （PSF） are estimated by Radon transformation and extrema a detection. Using the estimated blur parameters, the permuted image is restored by performing the L-R blind restoration method. The permutation mixing matrices can be accurately estimated by classifying the ringing effect in the restored image, thereby the source images can be separated. Simulation results show a better separation efficiency for the permuted motion blurred image with various permutation operations. The proposed algorithm indicates a better performance on the robustness against Gaussian noise and lossy JPEG compression.

关键词： permuted image blind source separation (BSS) motion blur blind restoration single-channel