Discrete Fourier Transform and Power Spectrum Calculates Power Spectrum from a Time Series
標(biāo)簽: Spectrum Power Calculates Transform
上傳時(shí)間: 2014-01-21
上傳用戶(hù):woshini123456
FFTW, a collection of fast C routines to compute the Discrete Fourier Transform in one or more dimensions.The fftw/ directory contains the source code for the complex transforms, and the rfftw/ directory contains the source code for the real transforms.
標(biāo)簽: collection Transform Discrete routines
上傳時(shí)間: 2016-08-17
上傳用戶(hù):yoleeson
A implementation of the discrete Fourier transform in visual basic classic.
標(biāo)簽: implementation transform discrete Fourier
上傳時(shí)間: 2013-11-29
上傳用戶(hù):caiiicc
Computing-the-2-D Discrete-Fourier-Transform IEEE article
標(biāo)簽: Discrete-Fourier-Transform Computing-the article IEEE
上傳時(shí)間: 2013-12-18
上傳用戶(hù):zhangzhenyu
A 64 points Discrete Fourier Transform code in AVR asm.
標(biāo)簽: Transform Discrete Fourier points
上傳時(shí)間: 2013-12-22
上傳用戶(hù):chenlong
~{JGR 8vQ IzWwR5SC5D2V?bD#DbO5M3~} ~{3v?b~} ~{Hk?b~} ~{2iQ/5H9&D\~} ~{?IRTWw@)3d~} ~{TZ~}JDK1.4.2~{OBM(9}~}
上傳時(shí)間: 2015-02-22
上傳用戶(hù):ommshaggar
This is a package to calculate Discrete Fourier/Cosine/Sine Transforms of 1-dimensional sequences of length 2^N. This package contains C and Fortran FFT codes.
標(biāo)簽: dimensional Transforms calculate sequences
上傳時(shí)間: 2014-01-14
上傳用戶(hù):LIKE
b to b 模式 電子商務(wù)系統(tǒng) ,c# 開(kāi)發(fā) , B/S結(jié)構(gòu)
標(biāo)簽: to 模式 電子商務(wù)系統(tǒng)
上傳時(shí)間: 2014-01-20
上傳用戶(hù):hanli8870
DFT(Discrete Fourier Transformation)是數(shù)字信號(hào)分析與處理如圖形、語(yǔ)音及圖像等領(lǐng)域的重要變換工具,直接計(jì)算DFT的計(jì)算量與變換區(qū)間長(zhǎng)度N的平方成正比。當(dāng)N較大時(shí),因計(jì)算量太大,直接用DFT算法進(jìn)行譜分析和信號(hào)的實(shí)時(shí)處理是不切實(shí)際的。快速傅立葉變換(Fast Fourier Transformation,簡(jiǎn)稱(chēng)FFT)使DFT運(yùn)算效率提高1~2個(gè)數(shù)量級(jí)。其原因是當(dāng)N較大時(shí),對(duì)DFT進(jìn)行了基4和基2分解運(yùn)算。FFT算法除了必需的數(shù)據(jù)存儲(chǔ)器ram和旋轉(zhuǎn)因子rom外,仍需較復(fù)雜的運(yùn)算和控制電路單元,即使現(xiàn)在,實(shí)現(xiàn)長(zhǎng)點(diǎn)數(shù)的FFT仍然是很困難。本文提出的FFT實(shí)現(xiàn)算法是基于FPGA之上的,算法完成對(duì)一個(gè)序列的FFT計(jì)算,完全由脈沖觸發(fā),外部只輸入一脈沖頭和輸入數(shù)據(jù),便可以得到該脈沖頭作為起始標(biāo)志的N點(diǎn)FFT輸出結(jié)果。由于使用了雙ram,該算法是流型(Pipelined)的,可以連續(xù)計(jì)算N點(diǎn)復(fù)數(shù)輸入FFT,即輸入可以是分段N點(diǎn)連續(xù)復(fù)數(shù)數(shù)據(jù)流。采用DIF(Decimation In Frequency)-FFT和DIT(Decimation In Time)-FFT對(duì)于算法本身來(lái)說(shuō)是無(wú)關(guān)緊要的,因?yàn)閮煞N情況下只是存儲(chǔ)器的讀寫(xiě)地址有所變動(dòng)而已,不影響算法的結(jié)構(gòu)和流程,也不會(huì)對(duì)算法復(fù)雜度有何影響。
標(biāo)簽: Transformation Discrete Fourier DFT
上傳時(shí)間: 2016-04-12
上傳用戶(hù):lx9076
a XOR b> a,然后a XOR b< b,and both a and b are dependent data
標(biāo)簽: XOR and dependent both
上傳時(shí)間: 2014-01-27
上傳用戶(hù):yxgi5
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