Transcription of FFT window functions - Chris Bore
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FFT window functions - Chris Bore
Fordwater, Pond Road, Woking, Surrey GU22 0 JZTelephone: (01483) 740138 Fax: (0148) 740136 email: Web: window functionsFFT window functions Limits on FFT analysisLimits on FFT analysisWhen using FFT anaysis to study thefrequency spectrum of signals, thereare limits on resolution betweendifferent frequencies, and ondetectability of a small signal in thepresence of a large are two basic problems: thefact that we can only measure thesignal for a limited time; and thefact that the FFT only calculatesresults for certain discrete frequencyvalues (the 'FFT bins'). The limit onmeasurement time is fundamentalto any frequency analysis technqiue:the frequency sampling is peculiarto numerical methods like the measurement timeLimited measurement timeThe first problem arises because thesignal can only be measured for alimited time.
Fordwater, Pond Road, Woking, Surrey GU22 0JZ Telephone: (01483) 740138 Fax: (0148) 740136 email: bores@bores.com Web: http://www.bores.com coherent power gain is the ...
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