Cirrus-logic CapturePlus II Manuel d'utilisateur télécharger pdf (Page 40)

CapturePlus II

40 DS789UM2

APPENDIX C. FFT WINDOW LEAKAGE

Windowing functions which are used to make FFT (Fast Fourier Transform) plots more informative also

generate a measurable error by spreading energy from the FFT signal peaks to the surrounding noise

floor. This results from an effect known as “window leakage”.

The following table lists the windowing functions and their associated peak signal losses that are used by

the Cirrus Logic CapturePlus II system.

Windowing Function Peak Signal Loss Side Lobe Attenuation

Rectangular 0 dB 0 dB

Hodie 5 Term (Proprietary) 3.457 dB 125 dB

Crystal 7 Term (Proprietary) 4.203 dB 175 dB

1 2 ... 35 36 37 38 39 40 41 42

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Cirrus-logic CapturePlus II Manuel d'utilisateur Page 40