[music-dsp] Need Help re: DSP Audio Hardware?
bvalade at winstarmail.com
Tue Jul 24 12:34:12 EDT 2001
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----- Original Message -----
From: "Benno Senoner" <sbenno at gardena.net>
To: <music-dsp at shoko.calarts.edu>
Sent: Tuesday, July 24, 2001 10:35 AM
Subject: [music-dsp] measuring the impulse response of an overlap-add FFT
> Still talking about the same old topic: the overlap-add FFT filter.
> I got it working but I'd like to measure it's impulse response.
> Would it be ok if I do the following:
> (I treat the overlap-add filter as a black box with an input and an
> - Feed an impulse to its input: (first sample = 1.0 , all others zero
> (assume the sample scala goes from -1.0 to 1.0).
> record it's output , let's say 64k samples
> now apply a window to that data (eg. Hamming , Blackman)
> take a 64k point FFT of the result and display it.
> Or are there more accurate methods to measure the frequency
> of a black box filter ?
> BTW: We know that the output of overlap-add FFT needs to be divided by a
> scale factor since the overlapping produces higher values than the input
> samples. (the more overlapping the bigger the sample values get)
> Does anyone know a good ressource on the web where I can lookup these
> factors, possibly those that take into account windowing ?
> eg what's the scale factor of FFT size = 1024 , Stride = 256 (overlap
> of 4) and sqrt(Hamming Window) as both analyze and synth window.
> dupswapdrop -- the music-dsp mailing list and website: subscription info,
> FAQ, source code archive, list archive, book reviews, dsp links
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