reSIDfp::Filter6581 Class Reference

#include <Filter6581.h>

Inheritance diagram for reSIDfp::Filter6581:

List of all members.

Public Member Functions
int	clock (int voice1, int voice2, int voice3)
void	input (int sample)
void	updatedCenterFrequency ()
void	updatedResonance ()
void	updatedMixing ()
void	setFilterCurve (double curvePosition)

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Detailed Description

Filter based on Dag Lem's 6581 filter from reSID 1.0 prerelease. See original source for discussion about theory of operation.

Java port by Antti S. Lankila

Author:

Ken Händel

Dag Lem

Antti Lankila

Leandro Nini

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Member Function Documentation

RESID_INLINE int reSIDfp::Filter6581::clock	(	int	v1,
		int	v2,
		int	v3
	)		[virtual]

SID clocking - 1 cycle

Parameters:

v1	voice 1 in
v2	voice 2 in
v3	voice 3 in

Returns:

filtered output

Implements reSIDfp::Filter.

void reSIDfp::Filter6581::setFilterCurve

(

double

curvePosition

)

Set filter curve type based on single parameter.

Parameters:

curvePosition

0 .. 1, where 0 sets center frequency high ("light") and 1 sets it low ("dark")

void reSIDfp::Filter6581::updatedCenterFrequency

(

)

[virtual]

Switch to new distortion curve.

Implements reSIDfp::Filter.

void reSIDfp::Filter6581::updatedMixing

(

)

[virtual]

Mixing configuration modified (offsets change)

Implements reSIDfp::Filter.

void reSIDfp::Filter6581::updatedResonance

(

)

[inline, virtual]

Resonance tuned by ear, based on a few observations:

• there's a small notch even in allpass mode - size of resonance hump is about 8 dB

Implements reSIDfp::Filter.

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The documentation for this class was generated from the following files:

• Filter6581.h
• Filter6581.cpp