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pp::Filters::IIRComb Class Template Reference

Infinite Impulse Response Comb filter functor. More...

#include <Filters.h>

Inheritance diagram for pp::Filters::IIRComb

[legend]Collaboration diagram for pp::Filters::IIRComb:

[legend]List of all members.

Public Methods
	IIRComb (unsigned delay=10, float c1 = 1.0f, float c2 = 1.0f)
virtual const char*	GetName () const
T	operator() (const T& x)
double	FrequencyResponse (float f)

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Detailed Description

template<typename T = short> template class pp::Filters::IIRComb

Infinite Impulse Response Comb filter functor.

Some poeple use this for reverb when d corresponds to more than a few milliseconds.

The basic equation is: y[n] = x[n] + y[n-d]

y(n) = x(n - D) + g * y(n - D)

D represents the number of samples of the "delay". So, one can see that the current output y(n) is equal to a delayed input x(n-D) plus a previous output y(n-D) multiplied by a gain factor g. If the value for D is high (say a tenth of a second), the comb filter will act as a kind of "echo". The gain g (usually between 0 and 1) determines the "reverberation time" of the filter. Charles Dodge has suggested that the relationship between g and the reverberation time (as composers might prefer to think of it) is:

D = delay in seconds rvt = reverberation time in seconds g = pow(0.001, (D/sr/rvt))

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

• /home/pcburns/c/penguinsound/include/PenguinSound/Filters.h

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