[music-dsp] Frequency domain never ceases to amaze me...
tothl at inf.u-szeged.hu
Mon Mar 3 05:11:00 EST 2003
On Mon, 3 Mar 2003, Angus F. Hewlett wrote:
> Because in this case the lowpass filter is smoothing between FFT bins on
> the time axis, so effectively each FFT contains an "echo" of the previous
> one with the delay time being equal to the frame rate.
Nope, it contains the "echo" of the previous one AVERAGED with the current
one. Otherwise it is not lowpass. Comb filters and lowpass filters have
quite different frequency response.
> A comb filter clearly has pitch
Only sounds can have pitch, as pitch is something we perceive.
A filter is something that takes an input and returns an output.
> or frequency (it's a filter, after all),
Only sine waves can have frequency. Not filters. Filters have frequency
Hungarian Academy of Sciences *
Research Group on Artificial Intelligence * "Failure only begins
e-mail: tothl at inf.u-szeged.hu * when you stop trying"
More information about the music-dsp