Comb filter

Typedefs
typedef struct SDTComb	SDTComb
	Opaque data structure representing a comb filter object.
typedef struct SDTComb	SDTComb
	Opaque data structure representing a comb filter object.

Functions
SDTComb *	SDTComb_new (long maxXDelay, long maxYDelay)
	Object constructor. More...
void	SDTComb_free (SDTComb *x)
	Object destructor. More...
void	SDTComb_setXDelay (SDTComb *x, double f)
	Sets the delay time for the feed forward section. More...
void	SDTComb_setYDelay (SDTComb *x, double f)
	Sets the delay time for the feedback section. More...
void	SDTComb_setXYDelay (SDTComb *x, double f)
	Sets the delay time for both sections. More...
void	SDTComb_setXGain (SDTComb *x, double f)
	Sets the gain for the feed forward section. More...
void	SDTComb_setYGain (SDTComb *x, double f)
	Sets the gain for the feedback section. More...
void	SDTComb_setXYGain (SDTComb *x, double f)
	Sets the gain for both sections. More...
double	SDTComb_dsp (SDTComb *x, double in)
	Signal processing routine. Call this function at sample rate to output the filtered signal. More...

Detailed Description

Comb filter, obtained adding to the input signal a rescaled and delayed copy of itself. The filter works both in feed forward (delayed copy added to the output) and feedback (delayed copy added to the input, causing a loop) configurations, with independent gains and delay times.

Function Documentation

double SDTComb_dsp	(	SDTComb *	x,
		double	in
	)

Signal processing routine. Call this function at sample rate to output the filtered signal.

Parameters

[in]

in

Input sample

Returns

Output sample

void SDTComb_free

(

SDTComb *

x

)

Object destructor.

Parameters

[in]

x

Pointer to the instance to destroy

SDTComb * SDTComb_new	(	long	maxXDelay,
		long	maxYDelay
	)

Object constructor.

Parameters

[in]	maxXDelay	Feed forward buffer size, in samples
[in]	maxXDelay	Feedback buffer size, in samples

Returns

Pointer to the new instance

void SDTComb_setXDelay	(	SDTComb *	x,
		double	f
	)

Sets the delay time for the feed forward section.

Parameters

[in]

f

Feed forward delay time, in samples

void SDTComb_setXGain	(	SDTComb *	x,
		double	f
	)

Sets the gain for the feed forward section.

Parameters

[in]

f

Feed forward gain [0,1]

void SDTComb_setXYDelay	(	SDTComb *	x,
		double	f
	)

Sets the delay time for both sections.

Parameters

[in]

f

Delay time, in samples

void SDTComb_setXYGain	(	SDTComb *	x,
		double	f
	)

Sets the gain for both sections.

Parameters

[in]

f

Gain [0,1]

void SDTComb_setYDelay	(	SDTComb *	x,
		double	f
	)

Sets the delay time for the feedback section.

Parameters

[in]

f

Feedback delay time, in samples

void SDTComb_setYGain	(	SDTComb *	x,
		double	f
	)

Sets the gain for the feedback section.

Parameters

[in]

f

Feedback gain [0,1]