AllPass1< Tv, Tp, Ts > Class Template Reference

First-order all-pass filter. More...

#include <Filter.h>

Inherits Ts.

List of all members.

Public Member Functions
	AllPass1 (Tp frq=1000)
void	freq (Tp v)
	Set cutoff frequency.
void	freqF (Tp v)
	Faster, but slightly less accurate than freq()
Tv	operator() (Tv input)
	Filters sample.
Tv	high (Tv input)
	High-pass filters sample.
Tv	low (Tv input)
	Low-pass filters sample.
Tp	freq ()
	Get current cutoff frequency.

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Detailed Description

template<class Tv = gam::real, class Tp = gam::real, class Ts = Synced>
class gam::AllPass1< Tv, Tp, Ts >

First-order all-pass filter.

This filter has the transfer function H(z) = (a + z^-1) / (1 + a z^-1). It is essentially a "phase" filter in that its only effect is to shift frequencies from 0 to Nyquist from 0 to -180 degress, respectively. The cutoff frequency is the frequency where the phase is shifted by -90 degrees. A lowpass or highpass filter can be constructed by adding or subtracting, respectively, the output of the filter to or from the input. When the center frequency is fs/4, the filter acts as a unit delay. When the center frequency is 0, the filter acts as a no-op. When the center frequency is fs/2, the filter acts as an inverter.

Template Parameters:

Tv	value (sample) type
Tp	parameter type
Ts	sync type

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Constructor & Destructor Documentation

AllPass1

(

Tp

frq = 1000

)

Parameters:

[in]

frq

Center frequency

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

• /Users/ljp/code/gamma/trunk/Gamma/Filter.h