#include <Filter8580.h>

Inheritance diagram for reSIDfp::Filter8580:

Public Member Functions
int	clock (int voice1, int voice2, int voice3)

void	updatedCenterFrequency ()

void	updatedResonance ()

void	input (int input)

void	updatedMixing ()

void	setFilterCurve (double curvePosition)

Public Member Functions inherited from reSIDfp::Filter
void	enable (bool enable)

void	reset ()

void	writeFC_LO (unsigned char fc_lo)

void	writeFC_HI (unsigned char fc_hi)

void	writeRES_FILT (unsigned char res_filt)

void	writeMODE_VOL (unsigned char mode_vol)

Additional Inherited Members
Protected Attributes inherited from reSIDfp::Filter
unsigned int	fc
	Filter cutoff frequency.

unsigned char	res
	Filter resonance.

unsigned char	vol
	Current volume.

bool	filt1
	Routing to filter or outside filter.

bool	filt2

bool	filt3

bool	filtE

bool	voice3off
	Switch voice 3 off.

bool	hp
	Highpass, bandpass, and lowpass filter modes.

bool	bp

bool	lp

Detailed Description

Filter for 8580 chip based on simple linear approximation of the FC control.

Member Function Documentation

RESID_INLINE int reSIDfp::Filter8580::clock	(	int	v1,
		int	v2,
		int	v3
	)

virtual

SID clocking - 1 cycle

Parameters

void reSIDfp::Filter8580::setFilterCurve ( double curvePosition )

inline

Set filter curve type based on single parameter.

Parameters

curvePosition filter's center frequency expressed in Hertz, default is 12500

void reSIDfp::Filter8580::updatedCenterFrequency ( )

inlinevirtual

Set filter cutoff frequency.

void reSIDfp::Filter8580::updatedMixing ( )

inlinevirtual

Mixing configuration modified (offsets change)

void reSIDfp::Filter8580::updatedResonance ( )

inlinevirtual

Set filter resonance.

The following function for 1/Q has been modeled in the MOS 8580:

1/Q = 2^(1/2)*2^(-x/8) = 2^(1/2 - x/8) = 2^((4 - x)/8)

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