Nsound::FilterLowPassIIR Class Reference

A class for filtering audio in the frequecy domain. More...

#include <Nsound/FilterLowPassIIR.h>

Inheritance diagram for Nsound::FilterLowPassIIR:

Public Types
enum	Type { LOW_PASS, HIGH_PASS }

Public Member Functions
	FilterLowPassIIR (const float64 &sample_rate, uint32 n_poles, const float64 &frequency, const float64 &percent_ripple=0.0)
AudioStream	filter (const AudioStream &x)
AudioStream	filter (const AudioStream &x, const float64 &frequency)
AudioStream	filter (const AudioStream &x, const Buffer &frequencies)
Buffer	filter (const Buffer &x)
Buffer	filter (const Buffer &x, const float64 &frequency)
Buffer	filter (const Buffer &x, const Buffer &frequencies)
float64	filter (const float64 &x)
float64	filter (const float64 &x, const float64 &frequency)
float64	getFrequency () const
void	plot (boolean show_fc=true, boolean show_phase=false)
void	reset ()
void	setCutoff (const float64 &fc)
	Sets the cut off frequency (Hz). More...
void	setRealtime (bool flag)
Buffer	getFrequencyAxis (const uint32 n_fft=8192)
Buffer	getFrequencyResponse (const uint32 n_fft=8192)
Buffer	getImpulseResponse (const uint32 n_samples=8192)
virtual uint32	getKernelSize () const
Buffer	getPhaseResponse ()
float64	getSampleRate () const
void	plot (boolean show_phase=false)

Protected Types
typedef std::set< Kernel >	KernelCache

Protected Member Functions
void	makeKernel (const float64 &frequency)
void	makeIIRKernelHelper (const float64 &frequency, float64 *a, float64 *b, uint32 p)

Protected Attributes
Type	type_
uint32	n_poles_
float64	frequency_
float64	percent_ripple_
float64 *	a_
float64 *	b_
float64 *	x_history_
float64 *	x_ptr_
float64 *	x_end_ptr_
float64 *	y_history_
float64 *	y_ptr_
float64 *	y_end_ptr_
KernelCache	kernel_cache_
float64	sample_rate_
float64	two_pi_over_sample_rate_
float64	sample_time_
uint32	kernel_size_
bool	is_realtime_

Detailed Description

A class for filtering audio in the frequecy domain.

Definition at line 47 of file FilterLowPassIIR.h.

Member Typedef Documentation

typedef std::set<Kernel> Nsound::FilterStageIIR::KernelCache

protectedinherited

Definition at line 141 of file FilterStageIIR.h.

Member Enumeration Documentation

enum Nsound::FilterStageIIR::Type

inherited

Enumerator
LOW_PASS
HIGH_PASS

Definition at line 53 of file FilterStageIIR.h.

    {
        LOW_PASS,
        HIGH_PASS
    };

Constructor & Destructor Documentation

FilterLowPassIIR::FilterLowPassIIR	(	const float64 &	sample_rate,
		uint32	n_poles,
		const float64 &	frequency,
		const float64 &	percent_ripple = 0.0
	)

Definition at line 42 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::frequency_, and Nsound::Filter::kernel_size_.

    :
    FilterStageIIR(
        FilterStageIIR::LOW_PASS,
        sample_rate,
        n_poles,
        frequency,
        percent_ripple)
{
    frequency_ = frequency;
    kernel_size_ = n_poles;
}

Member Function Documentation

AudioStream FilterLowPassIIR::filter

(

const AudioStream &

x

)

Definition at line 61 of file FilterLowPassIIR.cc.

References Nsound::Filter::filter().

Referenced by Nsound::FilterBandPassIIR::filter(), Nsound::FilterBandRejectIIR::filter(), main(), Nsound::Clarinet::play(), and Nsound::DrumBD01::play().

{
    return Filter::filter(x);
}

AudioStream FilterLowPassIIR::filter	(	const AudioStream &	x,
		const float64 &	frequency
	)

Definition at line 68 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::filter().

{
    return FilterStageIIR::filter(x, f);
}

AudioStream FilterLowPassIIR::filter	(	const AudioStream &	x,
		const Buffer &	frequencies
	)

Definition at line 75 of file FilterLowPassIIR.cc.

References Nsound::Filter::filter().

{
    return Filter::filter(x, frequencies);
}

Buffer FilterLowPassIIR::filter

(

const Buffer &

x

)

Definition at line 83 of file FilterLowPassIIR.cc.

References Nsound::Filter::filter().

{
    return Filter::filter(x);
}

Buffer FilterLowPassIIR::filter	(	const Buffer &	x,
		const float64 &	frequency
	)

Definition at line 90 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::filter().

{
    return FilterStageIIR::filter(x, f);
}

Buffer FilterLowPassIIR::filter	(	const Buffer &	x,
		const Buffer &	frequencies
	)

Definition at line 97 of file FilterLowPassIIR.cc.

References Nsound::Filter::filter().

{
    return Filter::filter(x, frequencies);
}

float64 FilterLowPassIIR::filter ( const float64 &  x )

virtual

Implements Nsound::Filter.

Definition at line 104 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::filter().

{
    return FilterStageIIR::filter(x);
}

float64 FilterLowPassIIR::filter ( const float64 &  x, const float64 &  frequency  )

virtual

Implements Nsound::Filter.

Definition at line 111 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::filter().

{
    return FilterStageIIR::filter(x, frequency);
}

float64 Nsound::FilterLowPassIIR::getFrequency ( ) const

inline

Definition at line 82 of file FilterLowPassIIR.h.

References Nsound::FilterStageIIR::frequency_.

Referenced by Nsound::FilterBandPassIIR::getFrequencyHigh(), Nsound::FilterBandRejectIIR::getFrequencyLow(), Nsound::FilterBandRejectIIR::plot(), and Nsound::FilterBandPassIIR::plot().

{return frequency_;};

void FilterLowPassIIR::plot	(	boolean	show_fc = true,
		boolean	show_phase = false
	)

Definition at line 125 of file FilterLowPassIIR.cc.

References Nsound::Plotter::axvline(), Nsound::FilterStageIIR::frequency_, Nsound::FilterStageIIR::n_poles_, Nsound::Filter::plot(), Nsound::Filter::sample_rate_, Nsound::Plotter::subplot(), and Nsound::Plotter::title().

Referenced by main().

{
    char title[128];
    sprintf(title,
        "Low Pass IIR Frequency Response\n"
        "order = %d, fc = %0.1f Hz, sr = %0.1f Hz",
        n_poles_ - 1, frequency_, sample_rate_);

    Filter::plot(show_phase);

    Plotter pylab;

    uint32 n_rows = 1;

    if(show_phase)
    {
        n_rows = 2;
    }

    if(show_fc)
    {
        pylab.subplot(n_rows, 1, 1);

        pylab.axvline(frequency_,"color='red'");

        pylab.title(title);
    }

}

void FilterLowPassIIR::reset ( )

virtual

Implements Nsound::Filter.

Definition at line 157 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::reset().

Referenced by Nsound::FilterBandPassIIR::reset(), and Nsound::FilterBandRejectIIR::reset().

{
    FilterStageIIR::reset();
}

void FilterLowPassIIR::setCutoff

(

const float64 &

fc

)

Sets the cut off frequency (Hz).

Definition at line 164 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::frequency_, makeKernel(), and Nsound::Filter::sample_rate_.

{
    if(fc > 0.0 && fc < sample_rate_ / 2.0)
    {
        frequency_ = fc;
        makeKernel(fc);
    }
}

void FilterLowPassIIR::makeKernel ( const float64 &  frequency )

protected

Definition at line 118 of file FilterLowPassIIR.cc.

References Nsound::FilterStageIIR::makeKernel().

Referenced by setCutoff().

{
    FilterStageIIR::makeKernel(frequency);
}

void FilterStageIIR::makeIIRKernelHelper ( const float64 &  frequency, float64 *  a, float64 *  b, uint32  p  )

protectedinherited

Definition at line 474 of file FilterStageIIR.cc.

References Nsound::FilterStageIIR::HIGH_PASS, Nsound::FilterStageIIR::LOW_PASS, M_PI, Nsound::FilterStageIIR::n_poles_, Nsound::FilterStageIIR::percent_ripple_, Nsound::Filter::sample_rate_, and Nsound::FilterStageIIR::type_.

Referenced by Nsound::FilterStageIIR::makeKernel().

{
    float64 n_poles = static_cast<float64>(n_poles_);

    float64 RP = -1.0 * cos(M_PI / (n_poles * 2.0) + (p - 1) * (M_PI / n_poles));
    float64 IP = sin(M_PI / (n_poles * 2.0) + (p - 1) * (M_PI / n_poles));

    float64 ES = 0.0;
    float64 VX = 0.0;
    float64 KX = 0.0;

    if(percent_ripple_ != 0.0)
    {
        float64 temp = (1.0 / (1.0 - percent_ripple_));

        ES = sqrt(temp * temp - 1.0);

        VX = (1.0 / n_poles) * log((1.0 / ES) + sqrt((1.0 /(ES * ES)) + 1.0));
        KX = (1.0 / n_poles) * log((1.0 / ES) + sqrt((1.0 /(ES * ES)) - 1.0));
        KX = (exp(KX) + exp(-KX)) / 2.0;
        RP = RP * ( (exp(VX) - exp(-1.0 * VX) ) / 2.0) / KX;
        IP = IP * ( (exp(VX) + exp(-1.0 * VX) ) / 2.0) / KX;
    }

    /* DEBUG
    if(p == 1)
    {
        std::cout << endl
                  << "RP = " << RP << endl
                  << "IP = " << IP << endl
                  << "ES = " << ES << endl
                  << "VX = " << VX << endl
                  << "KX = " << KX << endl << endl;
    }
    */


    float64 T = 2.0 * tan(0.5);
    float64 W = 2.0 * M_PI * (frequency / static_cast<float64>(sample_rate_));
    float64 M = RP * RP + IP * IP;
    float64 D = 4.0 - (4.0 * RP * T) + (M * T * T);
    float64 X0 = T * T / D;
    float64 X1 = 2.0 * X0;
    float64 X2 = X0;
    float64 Y1 = (8.0 - 2.0 * M * T * T) / D;
    float64 Y2 = (-4.0 - (4.0 * RP * T) - M * T * T) / D;

    /* DEBUG
    if(p == 1)
    {
        std::cout << "T  = " << T << endl
                  << "W  = " << W << endl
                  << "M  = " << M << endl
                  << "D  = " << D << endl
                  << "X0 = " << X0 << endl
                  << "X1 = " << X1 << endl
                  << "X2 = " << X2 << endl
                  << "Y1 = " << Y1 << endl
                  << "Y2 = " << Y2 << endl << endl;
    }
    */


    // Low Pass
    float64 K = 0.0;

    if(type_ == LOW_PASS)
    {
        K = sin(0.5 - W / 2.0) / sin(0.5 + W / 2.0);
    }

    // High Pass
    else if(type_ == HIGH_PASS)
    {
        K = -1.0 * cos(W / 2.0 + 0.5) / cos(W / 2.0 - 0.5);
    }

    D = 1.0 + Y1 * K - Y2 * K * K;
    b[0] = (X0 - X1 * K + X2 * K * K) / D;
    b[1] = (-2.0 * X0 *K + X1 + X1 * K * K - 2.0 * X2 * K) / D;
    b[2] = (X0 * K * K - X1 * K + X2) / D;
    a[1] = (2.0 * K + Y1 + Y1 * K * K - 2.0 * Y2 * K) / D;
    a[2] = (-1.0 * K * K - Y1 * K + Y2) / D;

    /* DEBUG
    if(p == 1)
    {
        std::cout << "W  = " << W    << endl
                  << "K  = " << K    << endl
                  << "D  = " << D    << endl
                  << "A0 = " << a[0] << endl
                  << "A1 = " << a[1] << endl
                  << "A2 = " << a[2] << endl
                  << "B1 = " << b[1] << endl
                  << "B2 = " << b[2] << endl << endl;
    }
    */

    if(type_ == HIGH_PASS)
    {
        b[1] = -b[1];
        a[1] = -a[1];
    }

    /* DEBUG
    if(p == 1)
    {
        std::cout << "A0 = " << a[0] << endl
                  << "A1 = " << a[1] << endl
                  << "A2 = " << a[2] << endl
                  << "B1 = " << b[1] << endl
                  << "B2 = " << b[2] << endl << endl;
    }
    */
}

void Nsound::Filter::setRealtime ( bool  flag )

inlineinherited

Definition at line 57 of file Filter.h.

References Nsound::Filter::is_realtime_.

{is_realtime_ = flag;}

Buffer Filter::getFrequencyAxis ( const uint32  n_fft = 8192 )

inherited

Definition at line 185 of file Filter.cc.

References Nsound::FFTransform::roundUp2(), and Nsound::Filter::sample_rate_.

Referenced by main(), Nsound::Filter::plot(), and Nsound::FilterIIR::savePlot().

{
    uint32 fft_chunk_size = FFTransform::roundUp2(
        static_cast<int32>(n_fft));

    uint32 n_samples = fft_chunk_size / 2 + 1;

    float64 f_step = (1.0 / (static_cast<float64>(fft_chunk_size) / 2.0))
                   * (sample_rate_ / 2.0);

    Buffer f_axis;

    float64 f = 0.0;

    for(uint32 i = 0; i < n_samples; ++i)
    {
        f_axis << f;
        f += f_step;
    }

    return f_axis;
};

Buffer Filter::getFrequencyResponse ( const uint32  n_fft = 8192 )

inherited

Definition at line 210 of file Filter.cc.

References Nsound::FFTransform::fft(), Nsound::Filter::getImpulseResponse(), and Nsound::Filter::sample_rate_.

Referenced by Nsound::FilterBandPassIIR::FilterBandPassIIR(), FilterLeastSquaresFIR_UnitTest(), Nsound::FilterIIR::getRMS(), main(), Nsound::Filter::plot(), and Nsound::FilterIIR::savePlot().

{
    FFTransform fft(sample_rate_);

//~    fft.setWindow(HANNING);

    FFTChunkVector vec;

    vec = fft.fft(getImpulseResponse(), n_fft);

    return vec[0].getMagnitude();
}

Buffer Filter::getImpulseResponse ( const uint32  n_samples = 8192 )

inherited

Definition at line 225 of file Filter.cc.

References Nsound::Filter::filter(), Nsound::Filter::is_realtime_, and Nsound::Filter::reset().

Referenced by Nsound::Filter::getFrequencyResponse(), Nsound::FilterHighPassFIR::getImpulseResponse(), Nsound::FilterLowPassFIR::getImpulseResponse(), Nsound::FilterLeastSquaresFIR::getImpulseResponse(), Nsound::FilterIIR::getImpulseResponse(), and Nsound::Filter::getPhaseResponse().

{
    if(!is_realtime_) reset();

    Buffer response(n_samples);

    response << filter(1.0);

    for(uint32 i = 1; i < n_samples; ++i)
    {
        response << filter(0.0);
    }

    if(!is_realtime_) reset();

    return response;
}

virtual uint32 Nsound::Filter::getKernelSize ( ) const

inlinevirtualinherited

Reimplemented in Nsound::FilterIIR, and Nsound::FilterTone.

Definition at line 96 of file Filter.h.

References Nsound::Filter::kernel_size_.

Referenced by Nsound::FilterBandPassIIR::FilterBandPassIIR(), Nsound::FilterBandPassFIR::plot(), Nsound::FilterBandPassIIR::plot(), and Nsound::FilterBandRejectIIR::plot().

{return kernel_size_;};

Buffer Filter::getPhaseResponse ( )

inherited

Definition at line 245 of file Filter.cc.

References Nsound::FFTransform::fft(), Nsound::Filter::getImpulseResponse(), Nsound::Buffer::getLength(), Nsound::Filter::sample_rate_, and Nsound::Buffer::subbuffer().

Referenced by Nsound::Filter::plot().

{
    uint32 n_samples = static_cast<uint32>(sample_rate_ * 2);

    FFTransform fft(n_samples);

    FFTChunkVector vec;

    vec = fft.fft(getImpulseResponse(), n_samples);

    Buffer phase = vec[0].getPhase();

    return phase.subbuffer(0, phase.getLength() / 2 + 1);
}

float64 Nsound::Filter::getSampleRate ( ) const

inlineinherited

Definition at line 102 of file Filter.h.

References Nsound::Filter::sample_rate_.

{ return sample_rate_; };

void Filter::plot ( boolean  show_phase = false )

inherited

Definition at line 262 of file Filter.cc.

References Nsound::Plotter::figure(), Nsound::Buffer::getdB(), Nsound::Filter::getFrequencyAxis(), Nsound::Filter::getFrequencyResponse(), Nsound::Buffer::getMax(), Nsound::Filter::getPhaseResponse(), Nsound::Plotter::plot(), Nsound::Plotter::subplot(), Nsound::Plotter::xlabel(), Nsound::Plotter::ylabel(), and Nsound::Plotter::ylim().

Referenced by main(), Nsound::FilterLowPassMoogVcf::plot(), Nsound::FilterPhaser::plot(), Nsound::FilterTone::plot(), Nsound::FilterHighPassIIR::plot(), Nsound::FilterCombLowPassFeedback::plot(), plot(), Nsound::FilterLowPassFIR::plot(), Nsound::FilterHighPassFIR::plot(), Nsound::FilterAllPass::plot(), Nsound::FilterBandPassVocoder::plot(), Nsound::FilterBandPassFIR::plot(), Nsound::FilterLeastSquaresFIR::plot(), Nsound::FilterFlanger::plot(), Nsound::FilterBandRejectFIR::plot(), Nsound::FilterBandRejectIIR::plot(), Nsound::FilterBandPassIIR::plot(), and Nsound::FilterParametricEqualizer::plot().

{
    Buffer x = getFrequencyAxis();
    Buffer fr = getFrequencyResponse().getdB();

    Plotter pylab;

    pylab.figure();

    uint32 n_rows = 1;
    uint32 n_cols = 1;

    if(show_phase)
    {
        n_rows = 2;
    }

    pylab.subplot(n_rows, n_cols, 1);

    // Frequency response
    pylab.plot(x,fr, "blue");

    pylab.xlabel("Frequency (Hz)");
    pylab.ylabel("Frequency Response (dB)");

    // Phase response
    if(show_phase)
    {
        pylab.subplot(n_rows, n_cols, 2);

        Buffer pr = getPhaseResponse().getdB();

        pylab.plot(x,pr);

        pylab.xlabel("Frequency (Hz)");
        pylab.ylabel("Phase Response (dB)");
    }

    float64 ymax = fr.getMax();
    float64 height = ymax - -60.0;

    pylab.ylim(-60.0, ymax + 0.05 * height);
}

Member Data Documentation

Type Nsound::FilterStageIIR::type_

protectedinherited

Definition at line 112 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::makeIIRKernelHelper(), Nsound::FilterStageIIR::makeKernel(), and Nsound::FilterStageIIR::operator=().

uint32 Nsound::FilterStageIIR::n_poles_

protectedinherited

Definition at line 113 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), Nsound::FilterStageIIR::FilterStageIIR(), Nsound::FilterStageIIR::makeIIRKernelHelper(), Nsound::FilterStageIIR::makeKernel(), Nsound::FilterStageIIR::operator=(), Nsound::FilterHighPassIIR::plot(), plot(), and Nsound::FilterStageIIR::reset().

float64 Nsound::FilterStageIIR::frequency_

protectedinherited

Definition at line 114 of file FilterStageIIR.h.

Referenced by Nsound::FilterHighPassIIR::FilterHighPassIIR(), FilterLowPassIIR(), Nsound::FilterHighPassIIR::getFrequency(), getFrequency(), Nsound::FilterStageIIR::Kernel::operator<(), Nsound::FilterStageIIR::operator=(), Nsound::FilterHighPassIIR::plot(), plot(), Nsound::FilterStageIIR::reset(), and setCutoff().

float64 Nsound::FilterStageIIR::percent_ripple_

protectedinherited

Definition at line 115 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::makeIIRKernelHelper(), and Nsound::FilterStageIIR::operator=().

float64* Nsound::FilterStageIIR::a_

protectedinherited

Definition at line 117 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), and Nsound::FilterStageIIR::makeKernel().

float64* Nsound::FilterStageIIR::b_

protectedinherited

Definition at line 118 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), and Nsound::FilterStageIIR::makeKernel().

float64* Nsound::FilterStageIIR::x_history_

protectedinherited

Definition at line 120 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), Nsound::FilterStageIIR::FilterStageIIR(), Nsound::FilterStageIIR::operator=(), Nsound::FilterStageIIR::reset(), and Nsound::FilterStageIIR::~FilterStageIIR().

float64* Nsound::FilterStageIIR::x_ptr_

protectedinherited

Definition at line 121 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), Nsound::FilterStageIIR::FilterStageIIR(), Nsound::FilterStageIIR::operator=(), and Nsound::FilterStageIIR::reset().

float64* Nsound::FilterStageIIR::x_end_ptr_

protectedinherited

Definition at line 122 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), Nsound::FilterStageIIR::FilterStageIIR(), and Nsound::FilterStageIIR::operator=().

float64* Nsound::FilterStageIIR::y_history_

protectedinherited

Definition at line 124 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), Nsound::FilterStageIIR::FilterStageIIR(), Nsound::FilterStageIIR::operator=(), Nsound::FilterStageIIR::reset(), and Nsound::FilterStageIIR::~FilterStageIIR().

float64* Nsound::FilterStageIIR::y_ptr_

protectedinherited

Definition at line 125 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), Nsound::FilterStageIIR::FilterStageIIR(), Nsound::FilterStageIIR::operator=(), and Nsound::FilterStageIIR::reset().

float64* Nsound::FilterStageIIR::y_end_ptr_

protectedinherited

Definition at line 126 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::filter(), Nsound::FilterStageIIR::FilterStageIIR(), and Nsound::FilterStageIIR::operator=().

KernelCache Nsound::FilterStageIIR::kernel_cache_

protectedinherited

Definition at line 143 of file FilterStageIIR.h.

Referenced by Nsound::FilterStageIIR::makeKernel(), Nsound::FilterStageIIR::operator=(), and Nsound::FilterStageIIR::~FilterStageIIR().

float64 Nsound::Filter::sample_rate_

protectedinherited

Definition at line 113 of file Filter.h.

Referenced by Nsound::FilterPhaser::filter(), Nsound::FilterCombLowPassFeedback::filter(), Nsound::FilterDelay::filter(), Nsound::FilterAllPass::FilterAllPass(), Nsound::FilterCombLowPassFeedback::FilterCombLowPassFeedback(), Nsound::FilterDelay::FilterDelay(), Nsound::FilterFlanger::FilterFlanger(), Nsound::FilterPhaser::FilterPhaser(), Nsound::FilterSlinky::FilterSlinky(), Nsound::Filter::getFrequencyAxis(), Nsound::Filter::getFrequencyResponse(), Nsound::Filter::getPhaseResponse(), Nsound::Filter::getSampleRate(), Nsound::FilterStageIIR::makeIIRKernelHelper(), Nsound::FilterHighPassFIR::makeKernel(), Nsound::FilterStageIIR::makeKernel(), Nsound::FilterBandPassVocoder::makeKernel(), Nsound::FilterLeastSquaresFIR::makeKernel(), Nsound::FilterParametricEqualizer::makeKernel(), Nsound::FilterPhaser::operator=(), Nsound::FilterLeastSquaresFIR::operator=(), Nsound::FilterFlanger::operator=(), Nsound::FilterIIR::operator=(), Nsound::FilterLowPassMoogVcf::plot(), Nsound::FilterPhaser::plot(), Nsound::FilterTone::plot(), Nsound::FilterHighPassIIR::plot(), Nsound::FilterCombLowPassFeedback::plot(), plot(), Nsound::FilterLowPassFIR::plot(), Nsound::FilterAllPass::plot(), Nsound::FilterHighPassFIR::plot(), Nsound::FilterBandPassFIR::plot(), Nsound::FilterLeastSquaresFIR::plot(), Nsound::FilterFlanger::plot(), Nsound::FilterBandRejectFIR::plot(), Nsound::FilterBandPassIIR::plot(), Nsound::FilterBandRejectIIR::plot(), Nsound::FilterParametricEqualizer::plot(), setCutoff(), and Nsound::FilterLeastSquaresFIR::setWindow().

float64 Nsound::Filter::two_pi_over_sample_rate_

protectedinherited

Definition at line 114 of file Filter.h.

Referenced by Nsound::FilterTone::makeKernel(), Nsound::FilterLowPassFIR::makeKernel(), and Nsound::FilterParametricEqualizer::makeKernel().

float64 Nsound::Filter::sample_time_

protectedinherited

Definition at line 115 of file Filter.h.

Referenced by Nsound::FilterLowPassMoogVcf::_make_filter().

uint32 Nsound::Filter::kernel_size_

protectedinherited

Definition at line 116 of file Filter.h.

Referenced by Nsound::FilterLowPassFIR::filter(), Nsound::FilterLeastSquaresFIR::filter(), Nsound::FilterBandPassFIR::FilterBandPassFIR(), Nsound::FilterBandPassIIR::FilterBandPassIIR(), Nsound::FilterBandRejectIIR::FilterBandRejectIIR(), Nsound::FilterHighPassIIR::FilterHighPassIIR(), Nsound::FilterLeastSquaresFIR::FilterLeastSquaresFIR(), Nsound::FilterLowPassFIR::FilterLowPassFIR(), FilterLowPassIIR(), Nsound::FilterLeastSquaresFIR::getKernel(), Nsound::Filter::getKernelSize(), Nsound::FilterHighPassFIR::makeKernel(), Nsound::FilterLowPassFIR::makeKernel(), Nsound::FilterBandRejectFIR::makeKernel(), Nsound::FilterLeastSquaresFIR::makeKernel(), Nsound::FilterLeastSquaresFIR::operator=(), Nsound::FilterLowPassFIR::plot(), Nsound::FilterHighPassFIR::plot(), Nsound::FilterLeastSquaresFIR::plot(), Nsound::FilterBandRejectFIR::plot(), Nsound::FilterLowPassFIR::reset(), Nsound::FilterHighPassFIR::reset(), Nsound::FilterLeastSquaresFIR::reset(), Nsound::FilterLeastSquaresFIR::setKernel(), Nsound::FilterLeastSquaresFIR::setWindow(), and Nsound::FilterHighPassFIR::spectraReversal_().

bool Nsound::Filter::is_realtime_

protectedinherited

Definition at line 118 of file Filter.h.

Referenced by Nsound::Filter::filter(), Nsound::FilterBandRejectIIR::filter(), Nsound::FilterBandRejectFIR::filter(), Nsound::Filter::getImpulseResponse(), and Nsound::Filter::setRealtime().

---

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

• Nsound/FilterLowPassIIR.h
• Nsound/FilterLowPassIIR.cc