@database SFX

@Remark (C) Copyright 1993-1996 Stefan Kost
@Remark All Rights Reserved
@Remark $VER: DeNoise-FFT.guide (26.11.95)
@Remark AmigaGuide-OnLine-Help for SoundFX

@master /guides/sfx.guide
@index /guides/sfx-index.guide/index

@node main "Operators : DeNoise-FFT"

@{b}DeNoise-FFT -------------------------------------------------------------------
-------------------------------------------------------------------------------@{ub}

Funktion  :	Removes noise from a sample (multifrequency Noisegate !).
Parameter :	Attack		Soft activation of the effect;
				use value up to 10
		Shape		Type of fade
		Threshold	Threshold value 10000 equals 100 %
				reasonable values are 10-50
		Bands		Just how many bands should SFX use. Less Bands
				means less math, but you lose out on accuracy.
		Steps		SFX does a transformation every <steps> sample-
				values. Lower values mean better quallity but
				longer calculation. Steps should be the half of
				bands.
		Window		Rectangle mean no windowing. All other functi-
				ons are supressing noise in the spectum. It de-
				pends on the situation what fits best.
ARexx     :	Attack		<Attackdelay> 0..255
		Shape		<Waveform> 0->Linear/1->SpeedUp/2->SlowDown
		Threshold	<Threshold> 0..1000 %%
		Bands		<Number> 0->4/1->8/2->16/3->32/4->64
		Steps		<Steps> 0->1/1->2/2->4/3->8/4->16/5->32
		Win		<wnr> 0..7
Hinweise  :	If threshold is set too higth, too much of the sample will be
		suppressed.
		The attackvalue should be very small.
		It is very difficult to find the right settings.
		Processing sample with this operator leads in most cases to an
		alienated sound, which sounds sometimes verz interesting.
		This operator uses @{" Fourier-Transformation " link /guides/sfx-glossary.guide/Fourier-Transformation} for its
		calculations.
@endnode