tailieunhanh - Báo cáo hóa học: " Adaptive Peak Frequency Estimation Using a Database of PARCOR Coefficients"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài:Adaptive Peak Frequency Estimation Using a Database of PARCOR Coefficients | EURASIP Journal on Applied Signal Processing 2005 7 1127-1136 2005 Hindawi Publishing Corporation Adaptive Peak Frequency Estimation Using a Database of PARCOR Coefficients Tetsuya Watanabe Department of Communications Engineering Graduate School of Engineering Osaka University Suita 565-0871 Japan Email tetsuya@ Youji Iiguni Department of Systems Innovation Graduate School of Engineering Science Osaka University Toyonaka 560-8531 Japan Email iiguni@ Received 10 March 2004 Revised 23 July 2004 Recommended for Publication by Chin-Hui Lee This paper presents an adaptive peak frequency estimation method using a database that stores PARCOR coefficients as key attributes and the corresponding peak frequencies as nonkey attributes. The least-square lattice algorithm is used to recursively estimate the PARCOR coefficients to adapt to changing circumstances. The nearest neighbor to the current PARCOR coefficient is retrieved from the database and the corresponding peak frequency is regarded as the estimation. A simultaneous execution of database construction and peak estimation with database update is performed to accelerate the processing time and to improve the estimation accuracy. Keywords and phrases peak frequency database retrieval AR spectrum PARCOR coefficient adaptive estimation. 1. INTRODUCTION Estimation of peak frequency of the power spectrum plays an important role in direction-of-arrival estimation communication system fault diagnosis and speech processing. Direction-of-arrival of multiple wave sources arriving on a linear array antenna can be estimated by finding local maxima of the space spectrum obtained from the array inputs 1 . Also in biological signals such as electroencephalogram blood pressure heart rate and laser Doppler flow peak frequencies provide important information on the diagnosis of diseases 2 3 4 5 . Peak frequencies of speech signals are an important cue in the characterization of speech sounds .