Search results for: Yue-Xian Zou

Items from 1 to 13 out of 13 results

chapter

Towards real-time source counting by estimation of coherent-to-diffuse ratios from ad-hoc microphone array recordings

Shahab Pasha, Jacob Donley, Christian Ritz, Yue Xian Zou

2017 Hands-free Speech Communications and Microphone Arrays (HSCMA) > 161 - 165

2017 Hands-free Speech Communications and Microphone Arrays (HSCMA)

Coherent-to-diffuse ratio (CDR) estimates over short time frames are utilized for source counting using ad-hoc microphone arrays to record speech from multiple participants in scenarios such as a meeting. It is shown that the CDR estimates obtained at ad-hoc dual (two channel) microphone nodes, located at unknown locations within an unknown reverberant room, can detect time frames with more than one...

article

Multi-Source DOA Estimation Using an Acoustic Vector Sensor Array Under a Spatial Sparse Representation Framework

Yue-Xian Zou, Bo Li, Christian H Ritz

Circuits, Systems, and Signal Processing > 2016 > 35 > 3 > 993-1020

This paper investigates the estimation of the two-dimensional direction of arrival (2D-DOA) of sound sources using an acoustic vector sensor array (AVSA) within a spatial sparse representation (SSR) framework (AVS-SSR-DOA). SSR-DOA estimation methods rely on a pre-defined grid of possible source DOAs and essentially suffer from the grid-effect problem: Reducing the size of the grid spacing leads to...

chapter

A hybrid convolutional neural networks with extreme learning machine for WCE image classification

Jia-sheng Yu, Jin Chen, Z.Q. Xiang, Yue-Xian Zou

2015 IEEE International Conference on Robotics and Biomimetics (ROBIO) > 1822 - 1827

2015 IEEE International Conference on Robotics and Biomimetics (ROBIO)

Wireless Capsule Endoscopy (WCE) is considered as a promising technology for non-invasive gastrointestinal disease examination. This paper studies the classification problem of the digestive organs for wireless capsule endoscopy (WCE) images aiming at saving the review time of doctors. Our previous study has proved the Convolutional Neural Networks (CNN)-based WCE classification system is able to...

chapter

An effective missing feature compensation method for speech recognition at noisy environment

Xu-Yan Hu, Yue-Xian Zou, Wei Shi

2014 IEEE China Summit & International Conference on Signal and Information Processing (ChinaSIP) > 133 - 137

2014 IEEE China Summit & International Conference on Signal and Information Processing (ChinaSIP)

It is a challenge task for maintaining high correct word accuracy rate (WAR) for state-of-art automatic speech recognition (ASR) systems when the SNR goes very low. To deal with such situation, the missing feature technology (MFT) has shown as one of the mainstream algorithms. In principle, conventional MFT firstly separate the unreliable spectral bins from the reliable ones. Then the unreliable bins...

article

Speech enhancement with an acoustic vector sensor: an effective adaptive beamforming and post-filtering approach

Yue Xian Zou, Peng Wang, Yong Qing Wang, Christian H Ritz, more

EURASIP Journal on Audio, Speech, and Music Processing > 2014 > 2014 > 1 > 1-12

Speech enhancement has an increasing demand in mobile communications and faces a great challenge in a real ambient noisy environment. This paper develops an effective spatial-frequency domain speech enhancement method with a single acoustic vector sensor (AVS) in conjunction with minimum variance distortionless response (MVDR) spatial filtering and Wiener post-filtering (WPF) techniques. In remote...

chapter

Improved DOA estimation with acoustic vector sensor arrays using spatial sparsity and subarray manifold

Bo Li, Yue Xian Zou

2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) > 2557 - 2560

ICASSP 2012 - 2012 IEEE International Conference on Acoustics, Speech and Signal Processing

The performance of DOA estimation with scalar sensor arrays using spatial sparse signal reconstruction (SSR) technique is affected by the grid spacing. In this paper, we formulate the DOA estimation with the acoustic vector sensor (AVS) arrays under SSR framework. A coarse-to-fine DOA estimation algorithm has been developed. The source spatial sparsity and the inter-relations among the manifold matrices...

chapter

An advanced WCE video summary using relation matrix rank

Jia Sen Huo, Yue Xian Zou, Lei Li

Proceedings of 2012 IEEE-EMBS International Conference on Biomedical and Health Informatics > 675 - 678

2012 IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI)

Wireless Capsule Endoscopy (WCE) is a promising new solution for gastrointestinal disease detection, which is able to view the entire gastrointestinal tract without pain. Since there are more than 50,000 frames in one WCE video from each test, the automatic computer-aided technique is highly demanded to remove the redundant frames while remaining the medical information. This paper presents a systematic...

article

A Novel Multiple Sparse Source Localization Using Triangular Pyramid Microphone Array

Mengqi Ren, Yue Xian Zou

IEEE Signal Processing Letters > 2012 > 19 > 2 > 83 - 86

Making use of the time-frequency spectra sparsity of the speech sources and the spatial and inter-relation information provided from a triangular pyramid microphone array (TPMA), the ratio of the inter-sensor phase difference (RIPD) is defined and a direct relationship between RIPD information and the direction of arrival (DOA) of each source is obtained. A novel multiple speech source localization...

article

Blind Timing Skew Estimation Using Source Spectrum Sparsity in Time-Interleaved ADCs

Yue Xian Zou, Xiang Jun Xu

IEEE Transactions on Instrumentation and Measurement > 2012 > 61 > 9 > 2401 - 2412

Timing skews in time-interleaved analog-to-digital converter (ADC) (TIADC) greatly degrade the spurious-free dynamic range of the TIADC, which can be improved effectively by digital compensation algorithms. Literature review shows that many nonblind compensation algorithms required the accurate timing skew parameters measured before the compensation process. In this paper, the blind timing skew estimation...

article

Timing Mismatch Compensation in Time-Interleaved ADCs Based on Multichannel Lagrange Polynomial Interpolation

Yue Xian Zou, Shang Liang Zhang, Yong Ching Lim, Xiao Chen

IEEE Transactions on Instrumentation and Measurement > 2011 > 60 > 4 > 1123 - 1131

In this paper, the timing mismatch compensation problem in the implementation of a time-interleaved analog-to-digital converter (TIADC) is investigated. The investigation leads to a novel multichannel Lagrange polynomial interpolation timing-mismatch compensation algorithm (MLPI-TMCA). A multichannel Lagrange compensation filter (MLCF) in the form of a finite-impulse response (FIR) filter is also...

chapter

A broadband speech enhancement technique based on frequency invariant beamforming and GSC

Yue-Xian Zou, Bo Li, Wei Liu

The 2010 International Conference on Green Circuits and Systems > 175 - 179

2010 International Conference on Green Circuits and Systems (ICGCS 2010)

Speech enhancement is one of the key and challenging techniques for a real-time speech recording system working in a meeting room, where cancellation of the competing speech and improvement of the speech intelligibility are two major concerns. In this paper, the application of frequency invariant beamforming to the speech enhancement problem based on the generalized sidelobe cancellation (GSC) structure...

chapter

A web service based gateway architecture for wireless sensor networks

Weidong Wang, Yue-Xian Zou, Guangyi Shi, Yuesheng Zhu

2009 11th International Conference on Advanced Communication Technology > 2 > 1160 - 1163

2009 11th International Conference on Advanced Communication Technology

This paper provides a novel method to access ZigBee based wireless sensor networks (WSN) from the Internet using web service approach. We designed a novel gateway between the WSN and the Internet mainly for the scenario of home and building automation. With the improvement of the traditional gateway, the users on the Internet can access the data of the sensor networks flexibly via web services. Each...

article

Time-Interleaved Analog-to-Digital-Converter Compensation Using Multichannel Filters

Yong Ching Lim, Yue-Xian Zou, Jun Wei Lee, Shing-Chow Chan

IEEE Transactions on Circuits and Systems I: Regular Papers > 2009 > 56 > 10 > 2234 - 2247

Published methods that employ a filter bank for compensating the timing and bandwidth mismatches of an M-channel time-interleaved analog-to-digital converter (TIADC) were developed based on the fact that each sub-ADC channel is a downsampled version of the analog input. The output of each sub-ADC is filtered in such a way that, when all the filter outputs are summed, the aliasing components are minimized...

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