Improved Instantaneous Frequency Estimation Using an Adaptive Short-Time Fourier Transform
標(biāo)簽: Instantaneous Estimation Short-Time Frequency
上傳時(shí)間: 2013-12-15
上傳用戶:ardager
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:lx9076
oJPEG2000中DWT的MATLAB實(shí)現(xiàn)n the use of discrete cosine transform DCT jpeg compression Matlab source, simple and practical, the Notes have a good time
標(biāo)簽: compression transform discrete MATLAB
上傳時(shí)間: 2013-12-14
上傳用戶:luopoguixiong
快速傅里葉變換(FFT)算法。FFT - Fast Fourier transform. The length of X must be a power of two, for a fast radix-2 fast-Fourier transform algorithm is used
標(biāo)簽: FFT transform Fourier length
上傳時(shí)間: 2013-12-19
上傳用戶:sy_jiadeyi
Analysis of blind data hiding using discrete cosine transform phase modulation。
標(biāo)簽: modulation transform Analysis discrete
上傳時(shí)間: 2013-12-27
上傳用戶:yzy6007
implement fourier transform by matlab
標(biāo)簽: implement transform fourier matlab
上傳時(shí)間: 2016-09-24
上傳用戶:372825274
fft.c - fast Fourier transform and its inverse (both recursively)
標(biāo)簽: recursively transform Fourier inverse
上傳時(shí)間: 2016-10-06
上傳用戶:jqy_china
fftw,the fastest fourier transform in the West。用于快速計(jì)算離散傅里葉變換,用c編程
標(biāo)簽: the transform fastest fourier
上傳時(shí)間: 2014-12-08
上傳用戶:wang5829
Radix-2 Fast Fourier Transform, real or complex sin/cos transform
標(biāo)簽: Transform transform Fourier complex
上傳時(shí)間: 2013-12-30
上傳用戶:rocketrevenge
Daubechies discrete wavelet transform
標(biāo)簽: Daubechies transform discrete wavelet
上傳時(shí)間: 2017-02-15
上傳用戶:TF2015
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