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Improved Speech Denoising Algorithm Based on Discrete Fractional Fourier Transform
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作者 Zhu-Gao Ding Feng-Qin Yu 《Journal of Electronic Science and Technology of China》 2008年第1期29-31,共3页
The speech signal and noise signal are the typical non-stationary signals,however the speech signa is short-stationary synchronously.Presently,the denoising methods are always executed in frequency domain due to the s... The speech signal and noise signal are the typical non-stationary signals,however the speech signa is short-stationary synchronously.Presently,the denoising methods are always executed in frequency domain due to the short-time stationarity of the speech signal.In this article,an improved speech denoising algorithm based on discrete fractional Fourier transform(DFRFT)is pre sented.This algorithm contains linear optimal filtering and median filtering.The simulation shows that it can easily eliminate the noise compared to Wiener filtering improve the signal to noise ratio(SNR),and enhance the original speech signal. 展开更多
关键词 discrete fractional fourier transform(DFRFT) linear optimal filtering speech enhancement.
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Digital watermarking for still image based on discrete fractional fourier transform 被引量:3
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作者 牛夏牧 孙圣和 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2001年第3期309-311,共3页
Presents a digital watermarking technique based on discrete fractional Fourier transform (DFRFT), discusses the transformation of the original image by DFRFT, and the modification of DFRFT coefficients of the original... Presents a digital watermarking technique based on discrete fractional Fourier transform (DFRFT), discusses the transformation of the original image by DFRFT, and the modification of DFRFT coefficients of the original image by the information of watermark, and concludes from experimental results that the proposed technique is robust to lossy compression attack. 展开更多
关键词 WATERMARKING discrete fractional fourier transform lossy compression attack
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Research progress on discretization of fractional Fourier transform 被引量:23
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作者 TAO Ran ZHANG Feng WANG Yue 《Science in China(Series F)》 2008年第7期859-880,共22页
As the fractional Fourier transform has attracted a considerable amount of attention in the area of optics and signal processing, the discretization of the fractional Fourier transform becomes vital for the applicatio... As the fractional Fourier transform has attracted a considerable amount of attention in the area of optics and signal processing, the discretization of the fractional Fourier transform becomes vital for the application of the fractional Fourier transform. Since the discretization of the fractional Fourier transform cannot be obtained by directly sampling in time domain and the fractional Fourier domain, the discretization of the fractional Fourier transform has been investigated recently. A summary of discretizations of the fractional Fourier transform developed in the last nearly two decades is presented in this paper. The discretizations include sampling in the fractional Fourier domain, discrete-time fractional Fourier transform, fractional Fourier series, discrete fractional Fourier transform (including 3 main types: linear combination-type; sampling-type; and eigen decomposition-type), and other discrete fractional signal transform. It is hoped to offer a doorstep for the readers who are interested in the fractional Fourier transform. 展开更多
关键词 fractional fourier transform sampling in the fractional fourier domain discrete-time fractional fourier transform fractional fourier series discrete fractional fourier transform
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