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Author Topic:   reduction filter
flo
Member
posted 14 August 2005 09:48         Edit/Delete Message   Reply w/Quote
Hi,
with a kind of reduction filter I wanted to reduce
a sound (sample) to one of its partials .
The first attempt was simply with a bandpass-filter
and the following code:

<20 hz + (((!Freq - 20) - !BW) * !Red) smoothed hz>
(into the frequency field of the high-pass filter)

<(!Freq hz + !BW hz) + ((22050 - (!Freq + !BW)) * (1 - !Red))
smoothed hz>
(into the frequency field of the low-pass filter)

'!Red' stands for reduction, the hot parameter for realtime
control of the amount of filter reduction.

This sound with this code works perfectly well with a normal
speech signal, leaving it unaltered when !Red = 0. But with
a heavy, distorted explosion it doesn't work, that is, the
sound is not the original one when !Red = 0. It is somehow
distorted by the filters. Why is this and how can I accomplish
that I hear the original, unaltered, when !Red = 0?

Best,

Florian

p.s. have to send a sound example later

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keph
Member
posted 14 August 2005 10:55         Edit/Delete Message   Reply w/Quote

it could be overloading the highpass filter. the standard kyma IIR highpass will distort if the input is too high. in general, i set the scale (which is the input scale) at 0.5 and only will set higher if I know the incoming sounds are attenuated.


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flo
Member
posted 17 August 2005 13:43         Edit/Delete Message   Reply w/Quote
Yes, attenuation indeed helps, I totally forgot about that
necessity. Thanks!


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