frank
Registered:1192180911 Posts: 12
Posted 1203096367
Reply with quote
#1
Hi everyone, I wish all of you a happy new year, and best wishes ! We have dig resolution matters on TEF25, regarding the FFT window size. For example, if we can give the MLS window a 8.05ms lenght without incorporating wall reflexions, it gives you 386 samples of analysis and leads to a 124Hz resolution. Am I right so far ?Then , first question: assuming samples are multiples of 2 to the power n, what about these 368 samples ? (as it falls between 2 to the power 8 and 2 to the power 9)Second question: when parameter "FFT lenght" is set to one, we will get, in the FFT-calculated frequency response, a straight line between values at 124 and 248 Hz. If we set FFT length to 9 for example, this "kind of" smooth the frequency response... and sometimes it generates (or reveal??) ripples. So, what exactly stands this parameter for ? Does it extend time windowing ? Does it extrapolates FFT calculation ? Other ? Thanks for these answers. FRANK