Nsound::FilterBandRejectFIR Class Reference

#include <Nsound/FilterBandRejectFIR.h>

Inheritance diagram for Nsound::FilterBandRejectFIR:

Classes
struct	Kernel
	A class to store calculated kernels. More...

Public Member Functions
	FilterBandRejectFIR (const float64 &sample_rate, uint32 kernel_size, const float64 &frequency_Hz_low, const float64 &frequency_Hz_high)
virtual	~FilterBandRejectFIR ()
float64	getFrequencyLow () const
float64	getFrequencyHigh () const
AudioStream	filter (const AudioStream &x)
AudioStream	filter (const AudioStream &x, const float64 &f_low, const float64 &f_high)
AudioStream	filter (const AudioStream &x, const Buffer &low_frequencies, const Buffer &high_frequencies)
Buffer	filter (const Buffer &x)
Buffer	filter (const Buffer &x, const float64 &f_low, const float64 &f_high)
Buffer	filter (const Buffer &x, const Buffer &frequencies_Hz_low, const Buffer &frequencies_Hz_high)
virtual float64	filter (const float64 &x)
virtual float64	filter (const float64 &x, const float64 &frequency_Hz)
virtual float64	filter (const float64 &x, const float64 &frequency_Hz_low, const float64 &frequency_Hz_high)
void	makeKernel (const float64 &frequency_Hz_low, const float64 &frequency_Hz_high)
void	plot (boolean show_fc=true, boolean show_phase=false)
void	reset ()
AudioStream	filter (const AudioStream &x, const float64 &frequency)
AudioStream	filter (const AudioStream &x, const Buffer &frequencies)
Buffer	filter (const Buffer &x, const float64 &frequency)
Buffer	filter (const Buffer &x, const Buffer &frequencies)
float64	getFrequency () const
Buffer	getImpulseResponse ()
Buffer	getImpulseResponse (const uint32 n_samples=8192)
void	makeKernel (const float64 &frequency)
void	plot (boolean show_phase=false)
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)
virtual uint32	getKernelSize () const
Buffer	getPhaseResponse ()
float64	getSampleRate () const

Protected Types
typedef std::set< Kernel >	KernelCache

Protected Member Functions
void	spectraReversal_ ()

Protected Attributes
float64	frequency_2_Hz_
KernelCache	kernel_cache_
FilterLowPassFIR::KernelCache	hp_cache_
float64 *	b_
float64 *	window_
float64 *	x_history_
float64 *	x_ptr_
float64 *	x_end_ptr_
float64	frequency_1_Hz_
KernelCache	lp_cache_
float64	sample_rate_
float64	two_pi_over_sample_rate_
float64	sample_time_
uint32	kernel_size_
bool	is_realtime_

Private Member Functions
	FilterBandRejectFIR (const FilterBandRejectFIR &copy)
FilterBandRejectFIR &	operator= (const FilterBandRejectFIR &rhs)

Detailed Description

Definition at line 47 of file FilterBandRejectFIR.h.

Member Typedef Documentation

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

protected

Definition at line 146 of file FilterBandRejectFIR.h.

Constructor & Destructor Documentation

FilterBandRejectFIR::FilterBandRejectFIR	(	const float64 &	sample_rate,
		uint32	kernel_size,
		const float64 &	frequency_Hz_low,
		const float64 &	frequency_Hz_high
	)

Definition at line 47 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::frequency_1_Hz_, and reset().

    :
    FilterHighPassFIR(sample_rate, kernel_size, frequency_Hz_high),
    frequency_2_Hz_(frequency_Hz_high),
    kernel_cache_()
{
    frequency_1_Hz_ = frequency_Hz_low;

    reset();
}

FilterBandRejectFIR::~FilterBandRejectFIR ( )

virtual

Definition at line 63 of file FilterBandRejectFIR.cc.

References kernel_cache_.

{
    FilterBandRejectFIR::KernelCache::iterator itor =
        FilterBandRejectFIR::kernel_cache_.begin();

    FilterBandRejectFIR::KernelCache::iterator  end =
        FilterBandRejectFIR::kernel_cache_.end();

    while(itor != end)
    {
        delete [] itor->b_;
        ++itor;
    }
}

Nsound::FilterBandRejectFIR::FilterBandRejectFIR ( const FilterBandRejectFIR &  copy )

inlineprivate

Definition at line 152 of file FilterBandRejectFIR.h.

        :
        FilterHighPassFIR(copy.sample_rate_, 3, copy.frequency_1_Hz_),
        frequency_2_Hz_(0.0),
        kernel_cache_(){};

Member Function Documentation

float64 FilterBandRejectFIR::getFrequencyLow

(

)

const

Definition at line 80 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::frequency_1_Hz_.

{
    return frequency_1_Hz_;
}

float64 FilterBandRejectFIR::getFrequencyHigh

(

)

const

Definition at line 87 of file FilterBandRejectFIR.cc.

References frequency_2_Hz_.

{
    return frequency_2_Hz_;
}

AudioStream FilterBandRejectFIR::filter

(

const AudioStream &

x

)

Definition at line 95 of file FilterBandRejectFIR.cc.

References Nsound::Filter::filter().

Referenced by filter(), and main().

{
    return Filter::filter(x);
}

AudioStream FilterBandRejectFIR::filter	(	const AudioStream &	x,
		const float64 &	f_low,
		const float64 &	f_high
	)

Definition at line 102 of file FilterBandRejectFIR.cc.

References filter(), Nsound::AudioStream::getNChannels(), and Nsound::AudioStream::getSampleRate().

{
    uint32 n_channels = x.getNChannels();

    AudioStream y(x.getSampleRate(), n_channels);

    for(uint32 channel = 0; channel < n_channels; ++channel)
    {
        y[channel] = FilterBandRejectFIR::filter(x[channel], f_low, f_high);
    }

    return y;
}

AudioStream FilterBandRejectFIR::filter	(	const AudioStream &	x,
		const Buffer &	low_frequencies,
		const Buffer &	high_frequencies
	)

Definition at line 121 of file FilterBandRejectFIR.cc.

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

{
    if(!is_realtime_) reset();

    uint32 n_channels = x.getNChannels();

    AudioStream y(x.getSampleRate(), n_channels);

    for(uint32 channel = 0; channel < n_channels; ++channel)
    {
        y[channel] = FilterBandRejectFIR::filter(
            x[channel],
            frequencies_Hz_low,
            frequencies_Hz_high);
    }

    return y;
}

Buffer FilterBandRejectFIR::filter

(

const Buffer &

x

)

Definition at line 145 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::filter().

{
    return FilterLowPassFIR::filter(x);
}

Buffer FilterBandRejectFIR::filter	(	const Buffer &	x,
		const float64 &	f_low,
		const float64 &	f_high
	)

Definition at line 152 of file FilterBandRejectFIR.cc.

References Nsound::Buffer::begin(), Nsound::Buffer::end(), Nsound::FilterLowPassFIR::filter(), Nsound::Buffer::getLength(), Nsound::Filter::is_realtime_, makeKernel(), and reset().

{
    if(!is_realtime_) reset();

    // Instead of calling filter(x,f_low, f_high), we implement this function
    // here to avoid calling makeKernel(f) for each sample.

    FilterBandRejectFIR::makeKernel(f_low, f_high);

    Buffer::const_iterator itor = x.begin();
    Buffer::const_iterator end = x.end();

    Buffer y(x.getLength());
    while(itor != end)
    {
        y << FilterLowPassFIR::filter(*itor);
        ++itor;
    }

    return y;
}

Buffer FilterBandRejectFIR::filter	(	const Buffer &	x,
		const Buffer &	frequencies_Hz_low,
		const Buffer &	frequencies_Hz_high
	)

Definition at line 179 of file FilterBandRejectFIR.cc.

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

{
    if(!is_realtime_) reset();

    uint32 n_high_freqs = frequencies_Hz_high.getLength();
    uint32 n_low_freqs  = frequencies_Hz_low.getLength();

    Buffer y;

    uint32 x_samples = x.getLength();

    for(uint32 i = 0; i < x_samples; ++i)
    {
        y << FilterBandRejectFIR::filter(
            x[i],
            frequencies_Hz_low [i % n_low_freqs],
            frequencies_Hz_high[i % n_high_freqs]);
    }

    return y;
}

float64 FilterBandRejectFIR::filter ( const float64 &  x )

virtual

Reimplemented from Nsound::FilterHighPassFIR.

Definition at line 206 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::filter().

{
    return FilterLowPassFIR::filter(x);
}

float64 FilterBandRejectFIR::filter ( const float64 &  x, const float64 &  frequency_Hz  )

virtual

Reimplemented from Nsound::FilterHighPassFIR.

Definition at line 213 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::filter().

{
    return FilterLowPassFIR::filter(x);
}

float64 FilterBandRejectFIR::filter ( const float64 &  x, const float64 &  frequency_Hz_low, const float64 &  frequency_Hz_high  )

virtual

Definition at line 220 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::filter(), and makeKernel().

{
    makeKernel(frequencies_Hz_low, frequencies_Hz_high);
    return FilterLowPassFIR::filter(x);
}

void FilterBandRejectFIR::makeKernel	(	const float64 &	frequency_Hz_low,
		const float64 &	frequency_Hz_high
	)

Definition at line 231 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::b_, Nsound::FilterBandRejectFIR::Kernel::b_, kernel_cache_, Nsound::Filter::kernel_size_, Nsound::FilterHighPassFIR::makeKernel(), and Nsound::FilterLowPassFIR::makeKernel().

Referenced by filter(), and reset().

{
    // Here we create a key into the kernel cache.  I'm only storing kernels
    // with freqs chopped off to the 10th Hz.  So filtering with a kernel
    // designed at 440.1567 Hz will get stored as 440.1.  Any other frequency
    // that starts at 440.1 will not get a kernel calculated and just use the
    // one in the cache.  So the max diff between what's passed in and what's
    // stored in the cache is 0.09999 Hz.

    FilterBandRejectFIR::Kernel new_kernel(
        static_cast<uint32>(low_frequency),
        static_cast<uint32>(high_frequency));

    // See if the kernel is in the cache.

    FilterBandRejectFIR::KernelCache::const_iterator itor =
        FilterBandRejectFIR::kernel_cache_.find(new_kernel);

    if(itor != FilterBandRejectFIR::kernel_cache_.end())
    {
        // The kernel was found in the cache.
        b_ = itor->b_;
        return;
    }

    // The filter wasn't in the cache, need to make it.
    new_kernel.b_ = new float64[kernel_size_];

    if(low_frequency < 0.10 && high_frequency >= 0.10)
    {
        // Create simple high pass filter.
        FilterHighPassFIR::makeKernel(high_frequency);

//~        // b_ is now pointing at a high pass kernel held in the high pass cache
//~        memcpy(new_kernel.b_, b_, kernel_size_ * sizeof(float64));

        return;

    }
    else if(low_frequency >= 0.10 && high_frequency < 0.10)
    {
        // Create simple low pass filter.
        FilterLowPassFIR::makeKernel(low_frequency);

//~        // b_ is now pointing at a high pass kernel held in the low pass cache
//~        memcpy(new_kernel.b_, b_, kernel_size_ * sizeof(float64));

        return;

    }
    else if(low_frequency <= 0.10 && high_frequency < 0.10)
    {
        // Create simple All pass filter
        new_kernel.b_[0] = 1.0;

        for(uint32 i = 1; i < kernel_size_; ++i)
        {
            new_kernel.b_[i] = 0.00000;
        }
    }
    else  // non-zero frequencies
    {
        FilterLowPassFIR::makeKernel(low_frequency);

        // Now b_ is pointing to a low pass kernel held in the low pass cache.
        memcpy(new_kernel.b_, b_, kernel_size_ * sizeof(float64));

        FilterHighPassFIR::makeKernel(high_frequency);

        // b_ is now pointing at a high pass kernel held in the high pass cache

        // To create the band reject, simply add the low pass and high pass
        // kernels.

        for(uint32 i = 0; i < kernel_size_; ++i)
        {
            // low kernel += high kernel
            new_kernel.b_[i] += b_[i];
        }
    }

    // point at the new kernel
    b_ = new_kernel.b_;

    // insert into cache
    FilterBandRejectFIR::kernel_cache_.insert(new_kernel);
}

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

Definition at line 321 of file FilterBandRejectFIR.cc.

References Nsound::Plotter::axvline(), Nsound::FilterLowPassFIR::frequency_1_Hz_, frequency_2_Hz_, Nsound::Filter::kernel_size_, Nsound::Filter::plot(), Nsound::Filter::sample_rate_, Nsound::Plotter::subplot(), and Nsound::Plotter::title().

Referenced by main().

{
    char title[128];
    sprintf(title,
        "Band Reject FIR Frequency Response\n"
        "order = %d, fl = %0.1f Hz, fl = %0.1f Hz, sr = %0.1f Hz",
        kernel_size_ - 1,
        frequency_1_Hz_,
        frequency_2_Hz_,
        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_1_Hz_,"color='red'");
        pylab.axvline(frequency_2_Hz_,"color='red'");

        pylab.title(title);
    }
}

void FilterBandRejectFIR::reset ( )

virtual

Resets interal history buffer and sets the cut off frequency to the one used at declaration.

Reimplemented from Nsound::FilterHighPassFIR.

Definition at line 356 of file FilterBandRejectFIR.cc.

References Nsound::FilterLowPassFIR::frequency_1_Hz_, frequency_2_Hz_, makeKernel(), and Nsound::FilterLowPassFIR::reset().

Referenced by filter(), and FilterBandRejectFIR().

{
    FilterLowPassFIR::reset();
    makeKernel(frequency_1_Hz_, frequency_2_Hz_);
}

FilterBandRejectFIR& Nsound::FilterBandRejectFIR::operator= ( const FilterBandRejectFIR &  rhs )

inlineprivate

Definition at line 159 of file FilterBandRejectFIR.h.

{return *this;};

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

inherited

Definition at line 81 of file FilterHighPassFIR.cc.

References Nsound::Filter::filter().

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

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

inherited

Definition at line 88 of file FilterHighPassFIR.cc.

References Nsound::Filter::filter().

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

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

inherited

Definition at line 102 of file FilterHighPassFIR.cc.

References Nsound::Buffer::begin(), Nsound::Buffer::end(), Nsound::FilterLowPassFIR::filter(), Nsound::FilterHighPassFIR::makeKernel(), and Nsound::FilterHighPassFIR::reset().

{
    // Instead of calling Filter::filter(x,f), we implement this function here
    // to avoid calling makeKernel(f) for each sample.

    FilterHighPassFIR::reset();
    FilterHighPassFIR::makeKernel(f);

    Buffer::const_iterator itor = x.begin();
    Buffer::const_iterator end = x.end();

    Buffer y;
    while(itor != end)
    {
        y << FilterLowPassFIR::filter(*itor);
        ++itor;
    }

    return y;
}

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

inherited

Definition at line 125 of file FilterHighPassFIR.cc.

References Nsound::Filter::filter().

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

float64 Nsound::FilterHighPassFIR::getFrequency ( ) const

inlineinherited

Definition at line 80 of file FilterHighPassFIR.h.

References Nsound::FilterLowPassFIR::frequency_1_Hz_.

Referenced by Nsound::FilterBandPassFIR::getFrequencyLow(), and Nsound::FilterBandPassFIR::plot().

{return frequency_1_Hz_;};

Buffer FilterHighPassFIR::getImpulseResponse ( )

inherited

Definition at line 147 of file FilterHighPassFIR.cc.

References Nsound::Filter::getImpulseResponse().

{
    return Filter::getImpulseResponse();
}

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;
}

void FilterHighPassFIR::makeKernel ( const float64 &  frequency )

inherited

Definition at line 154 of file FilterHighPassFIR.cc.

References Nsound::FilterLowPassFIR::b_, Nsound::FilterLowPassFIR::Kernel::b_, Nsound::FilterHighPassFIR::hp_cache_, Nsound::Filter::kernel_size_, Nsound::FilterLowPassFIR::makeKernel(), Nsound::Filter::sample_rate_, and Nsound::FilterHighPassFIR::spectraReversal_().

Referenced by Nsound::FilterHighPassFIR::filter(), makeKernel(), and Nsound::FilterHighPassFIR::reset().

{
    // Here we create a key into the kernel cache.  I'm only storing kernels
    // with freqs chopped off to the 10th Hz.  So filtering with a kernel
    // designed at 440.1567 Hz will get stored as 440.1.  Any other frequency
    // that starts at 440.1 will not get a kernel calculated and just use the
    // one in the cache.

    FilterLowPassFIR::Kernel new_kernel(
        static_cast<uint32>(cutoff_frequency_Hz));

    // See if the kernel is in the cache.

    FilterLowPassFIR::
    KernelCache::
    const_iterator itor = hp_cache_.find(new_kernel);

    if(itor != hp_cache_.end())
    {
        // The kernel was found in the cache.
        b_ = itor->b_;
        return;
    }

    // The filter wasn't in the cache, need to make it.
    new_kernel.b_ = new float64[kernel_size_];

    if(cutoff_frequency_Hz < 0.10)
    {
        // Create All pass filter.
        new_kernel.b_[0] = 1.0;

        b_ = new_kernel.b_;
    }
    else
    {
        float64 fc = sample_rate_ / 2.0 - cutoff_frequency_Hz;

        FilterLowPassFIR::makeKernel(fc);

        // Now b_ is pointing to a low pass kernel, copy it into new_kernel.
        memcpy(new_kernel.b_, b_, sizeof(float64) * kernel_size_);

        // Point to new kernel.
        b_ = new_kernel.b_;

        // Perform the spectra inversion on the kernel to turn it into a high
        // pass filter.
        spectraReversal_();
    }

    // Add the new kernel to the cache.
    hp_cache_.insert(new_kernel);
}

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(), Nsound::FilterLowPassIIR::plot(), Nsound::FilterLowPassFIR::plot(), Nsound::FilterHighPassFIR::plot(), Nsound::FilterAllPass::plot(), Nsound::FilterBandPassVocoder::plot(), Nsound::FilterBandPassFIR::plot(), Nsound::FilterLeastSquaresFIR::plot(), Nsound::FilterFlanger::plot(), 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);
}

void FilterHighPassFIR::spectraReversal_ ( )

protectedinherited

Definition at line 258 of file FilterHighPassFIR.cc.

References Nsound::FilterLowPassFIR::b_, and Nsound::Filter::kernel_size_.

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

{
    for(uint32 i = 0; i < kernel_size_; ++i)
    {
        if(i % 2)
        {
            b_[i] *= -1.00;
        }
    }
}

void FilterLowPassFIR::setCutoff ( const float64 &  fc )

inherited

Sets the cut off frequency (Hz).

Definition at line 366 of file FilterLowPassFIR.cc.

References Nsound::FilterLowPassFIR::frequency_1_Hz_, and Nsound::FilterLowPassFIR::reset().

{
    frequency_1_Hz_ = fc;
    reset();
}

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();
}

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_; };

Member Data Documentation

float64 Nsound::FilterBandRejectFIR::frequency_2_Hz_

protected

Definition at line 131 of file FilterBandRejectFIR.h.

Referenced by getFrequencyHigh(), plot(), and reset().

KernelCache Nsound::FilterBandRejectFIR::kernel_cache_

protected

Definition at line 148 of file FilterBandRejectFIR.h.

Referenced by makeKernel(), and ~FilterBandRejectFIR().

FilterLowPassFIR::KernelCache Nsound::FilterHighPassFIR::hp_cache_

protectedinherited

Definition at line 99 of file FilterHighPassFIR.h.

Referenced by Nsound::FilterHighPassFIR::makeKernel(), and Nsound::FilterHighPassFIR::~FilterHighPassFIR().

float64* Nsound::FilterLowPassFIR::b_

protectedinherited

Definition at line 104 of file FilterLowPassFIR.h.

Referenced by Nsound::FilterLowPassFIR::filter(), Nsound::FilterHighPassFIR::makeKernel(), Nsound::FilterLowPassFIR::makeKernel(), makeKernel(), and Nsound::FilterHighPassFIR::spectraReversal_().

float64* Nsound::FilterLowPassFIR::window_

protectedinherited

Definition at line 105 of file FilterLowPassFIR.h.

Referenced by Nsound::FilterLowPassFIR::FilterLowPassFIR(), Nsound::FilterLowPassFIR::makeKernel(), and Nsound::FilterLowPassFIR::~FilterLowPassFIR().

float64* Nsound::FilterLowPassFIR::x_history_

protectedinherited

Definition at line 108 of file FilterLowPassFIR.h.

Referenced by Nsound::FilterLowPassFIR::filter(), Nsound::FilterLowPassFIR::FilterLowPassFIR(), Nsound::FilterLowPassFIR::reset(), Nsound::FilterHighPassFIR::reset(), and Nsound::FilterLowPassFIR::~FilterLowPassFIR().

float64* Nsound::FilterLowPassFIR::x_ptr_

protectedinherited

Definition at line 109 of file FilterLowPassFIR.h.

Referenced by Nsound::FilterLowPassFIR::filter(), Nsound::FilterLowPassFIR::FilterLowPassFIR(), Nsound::FilterLowPassFIR::reset(), and Nsound::FilterHighPassFIR::reset().

float64* Nsound::FilterLowPassFIR::x_end_ptr_

protectedinherited

Definition at line 110 of file FilterLowPassFIR.h.

Referenced by Nsound::FilterLowPassFIR::filter(), and Nsound::FilterLowPassFIR::FilterLowPassFIR().

float64 Nsound::FilterLowPassFIR::frequency_1_Hz_

protectedinherited

Definition at line 112 of file FilterLowPassFIR.h.

Referenced by FilterBandRejectFIR(), Nsound::FilterHighPassFIR::FilterHighPassFIR(), Nsound::FilterHighPassFIR::getFrequency(), Nsound::FilterLowPassFIR::getFrequency(), getFrequencyLow(), Nsound::FilterLowPassFIR::plot(), Nsound::FilterHighPassFIR::plot(), plot(), Nsound::FilterLowPassFIR::reset(), Nsound::FilterHighPassFIR::reset(), reset(), and Nsound::FilterLowPassFIR::setCutoff().

KernelCache Nsound::FilterLowPassFIR::lp_cache_

protectedinherited

Definition at line 128 of file FilterLowPassFIR.h.

Referenced by Nsound::FilterLowPassFIR::makeKernel(), and Nsound::FilterLowPassFIR::~FilterLowPassFIR().

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(), Nsound::FilterLowPassIIR::plot(), Nsound::FilterLowPassFIR::plot(), Nsound::FilterAllPass::plot(), Nsound::FilterHighPassFIR::plot(), Nsound::FilterBandPassFIR::plot(), Nsound::FilterLeastSquaresFIR::plot(), Nsound::FilterFlanger::plot(), plot(), Nsound::FilterBandPassIIR::plot(), Nsound::FilterBandRejectIIR::plot(), Nsound::FilterParametricEqualizer::plot(), Nsound::FilterLowPassIIR::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(), Nsound::FilterLowPassIIR::FilterLowPassIIR(), Nsound::FilterLeastSquaresFIR::getKernel(), Nsound::Filter::getKernelSize(), Nsound::FilterHighPassFIR::makeKernel(), Nsound::FilterLowPassFIR::makeKernel(), makeKernel(), Nsound::FilterLeastSquaresFIR::makeKernel(), Nsound::FilterLeastSquaresFIR::operator=(), Nsound::FilterLowPassFIR::plot(), Nsound::FilterHighPassFIR::plot(), Nsound::FilterLeastSquaresFIR::plot(), 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(), filter(), Nsound::Filter::getImpulseResponse(), and Nsound::Filter::setRealtime().

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

• Nsound/FilterBandRejectFIR.h
• Nsound/FilterBandRejectFIR.cc