Nsound  0.9.4
Public Member Functions | Protected Attributes | List of all members
Nsound::FilterPhaser Class Reference

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

#include <Nsound/FilterPhaser.h>

Inheritance diagram for Nsound::FilterPhaser:
Inheritance graph
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Public Member Functions

 FilterPhaser (const float64 &sample_rate, const uint32 n_stages, const float64 &frequency, const float64 &frequency_step_per_stage, const float64 &max_delay_in_seconds)
 
 FilterPhaser (const FilterPhaser &copy)
 
 ~FilterPhaser ()
 
AudioStream filter (const AudioStream &x)
 
Buffer filter (const Buffer &x)
 
float64 filter (const float64 &x)
 
float64 filter (const float64 &x, const float64 &ignored)
 
FilterPhaseroperator= (const FilterPhaser &rhs)
 
void plot (boolean show_fc=false, boolean show_phase=false)
 
void reset ()
 
void setRealtime (bool flag)
 
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)
 
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 Attributes

uint32 n_stages_
 
float64 max_delay_
 
FilterAllPass ** filters_
 
std::vector< float64frequencies_
 
Bufferwaveform_
 
std::vector< float64waveform_position_
 
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 49 of file FilterPhaser.h.

Constructor & Destructor Documentation

FilterPhaser::FilterPhaser ( const float64 sample_rate,
const uint32  n_stages,
const float64 frequency,
const float64 frequency_step_per_stage,
const float64 max_delay_in_seconds 
)

Definition at line 47 of file FilterPhaser.cc.

References filters_, frequencies_, Nsound::Generator::generate(), M_ASSERT_VALUE, max_delay_, n_stages_, Nsound::Filter::sample_rate_, waveform_, and waveform_position_.

53  :
54  Filter(sample_rate),
55  n_stages_(n_stages),
56  max_delay_(max_delay_time_seconds),
57  filters_(NULL),
58  frequencies_(),
59  waveform_(NULL),
61 {
63  M_ASSERT_VALUE(frequency, >, 0.0);
64  M_ASSERT_VALUE(frequency_step_per_stage, >, 0.0);
65  M_ASSERT_VALUE(max_delay_, >, 0.0);
66 
67  float64 f = frequency;
68 
69  if(f <= 0.0) f = 1.0;
70 
71  float64 fstep = frequency_step_per_stage;
72 
73  if(fstep <= 0.0) fstep = 1.0 / static_cast<float64>(n_stages_);
74 
75  if(max_delay_ <= 0.0) max_delay_ = 0.1;
76 
78 
79  waveform_ = new Buffer(static_cast<uint32>(sample_rate_));
80 
81  Sine sin(sample_rate_);
82 
83  *waveform_ = (1.0 + sin.generate(1.0, 1.0)) / 2.0;
84 
85  for(uint32 i = 0; i < n_stages_; ++i)
86  {
88  waveform_position_.push_back(0.0);
89  frequencies_.push_back(f + fstep * static_cast<float64>(i));
90  }
91 }
unsigned int uint32
Definition: Nsound.h:153
#define M_ASSERT_VALUE(a, op, value)
Definition: Macros.h:76
FilterAllPass ** filters_
Definition: FilterPhaser.h:90
std::vector< float64 > frequencies_
Definition: FilterPhaser.h:91
std::vector< float64 > waveform_position_
Definition: FilterPhaser.h:93
double float64
Definition: Nsound.h:146
Filter(const float64 &sample_rate)
Definition: Filter.cc:41
A Buffer for storing audio samples.
Definition: Buffer.h:60
DOXME.
Definition: Sine.h:43
float64 sample_rate_
Definition: Filter.h:113
FilterPhaser::FilterPhaser ( const FilterPhaser copy)

Definition at line 95 of file FilterPhaser.cc.

References filters_, max_delay_, n_stages_, Nsound::Filter::sample_rate_, waveform_, and waveform_position_.

96  :
97  Filter(copy.sample_rate_),
98  n_stages_(copy.n_stages_),
99  max_delay_(copy.max_delay_),
100  filters_(NULL),
101  frequencies_(),
102  waveform_(NULL),
104 {
106 
107  waveform_ = new Buffer(static_cast<uint32>(sample_rate_));
108 
109  for(uint32 i = 0; i < n_stages_; ++i)
110  {
112  waveform_position_.push_back(0.0);
113  }
114 
115  *this = copy;
116 }
unsigned int uint32
Definition: Nsound.h:153
FilterAllPass ** filters_
Definition: FilterPhaser.h:90
std::vector< float64 > frequencies_
Definition: FilterPhaser.h:91
std::vector< float64 > waveform_position_
Definition: FilterPhaser.h:93
Filter(const float64 &sample_rate)
Definition: Filter.cc:41
A Buffer for storing audio samples.
Definition: Buffer.h:60
float64 sample_rate_
Definition: Filter.h:113
FilterPhaser::~FilterPhaser ( )

Definition at line 120 of file FilterPhaser.cc.

References filters_, n_stages_, and waveform_.

121 {
122  for(uint32 i = 0; i < n_stages_; ++i)
123  {
124  delete filters_[i];
125  }
126 
127  delete [] filters_;
128 
129  delete waveform_;
130 }
unsigned int uint32
Definition: Nsound.h:153
FilterAllPass ** filters_
Definition: FilterPhaser.h:90

Member Function Documentation

AudioStream FilterPhaser::filter ( const AudioStream x)

Definition at line 134 of file FilterPhaser.cc.

References Nsound::Filter::filter().

Referenced by filter().

135 {
136  return Filter::filter(x);
137 }
AudioStream filter(const AudioStream &x)
Definition: Filter.cc:53
Buffer FilterPhaser::filter ( const Buffer x)

Definition at line 141 of file FilterPhaser.cc.

References Nsound::Filter::filter().

142 {
143  return Filter::filter(x);
144 }
AudioStream filter(const AudioStream &x)
Definition: Filter.cc:53
float64 FilterPhaser::filter ( const float64 x)
virtual

Implements Nsound::Filter.

Definition at line 148 of file FilterPhaser.cc.

References Nsound::FilterAllPass::filter(), filters_, frequencies_, max_delay_, n_stages_, Nsound::Filter::sample_rate_, and waveform_position_.

149 {
150  float64 y = 0.0;
151 
152  for(uint32 i = 0; i < n_stages_; ++i)
153  {
154  float64 pos = waveform_position_[i]
155  + frequencies_[i];
156 
157  if(pos >= sample_rate_) pos -= sample_rate_;
158 
159  waveform_position_[i] = pos;
160 
161  float64 f = (*waveform_)[static_cast<uint32>(pos)];
162 
163  y += filters_[i]->filter(x, f * max_delay_);
164  }
165 
166  y /= static_cast<float64>(n_stages_);
167 
168  return (y+x) / 2.0;
169 }
unsigned int uint32
Definition: Nsound.h:153
FilterAllPass ** filters_
Definition: FilterPhaser.h:90
std::vector< float64 > frequencies_
Definition: FilterPhaser.h:91
std::vector< float64 > waveform_position_
Definition: FilterPhaser.h:93
double float64
Definition: Nsound.h:146
AudioStream filter(const AudioStream &x)
float64 sample_rate_
Definition: Filter.h:113
float64 Nsound::FilterPhaser::filter ( const float64 x,
const float64 ignored 
)
inlinevirtual

Implements Nsound::Filter.

Definition at line 74 of file FilterPhaser.h.

References filter().

75  { return filter(x); };
AudioStream filter(const AudioStream &x)
FilterPhaser & FilterPhaser::operator= ( const FilterPhaser rhs)

Definition at line 174 of file FilterPhaser.cc.

References filters_, frequencies_, max_delay_, n_stages_, Nsound::Filter::sample_rate_, waveform_, and waveform_position_.

175 {
176  if(this == &rhs)
177  {
178  return *this;
179  }
180 
182  max_delay_ = rhs.max_delay_;
183  *waveform_ = *rhs.waveform_;
186 
187  if(n_stages_ != rhs.n_stages_)
188  {
189  for(uint32 i = 0; i < n_stages_; ++i)
190  {
191  delete filters_[i];
192  }
193 
194  delete [] filters_;
195 
196  n_stages_ = rhs.n_stages_;
197 
198  filters_ = new FilterAllPass * [n_stages_];
199 
200  for(uint32 i = 0; i < n_stages_; ++i)
201  {
203  }
204  }
205 
206  for(uint32 i = 0; i < n_stages_; ++i)
207  {
208  *filters_[i] = *rhs.filters_[i];
209  }
210 
211  return *this;
212 }
unsigned int uint32
Definition: Nsound.h:153
FilterAllPass ** filters_
Definition: FilterPhaser.h:90
std::vector< float64 > frequencies_
Definition: FilterPhaser.h:91
std::vector< float64 > waveform_position_
Definition: FilterPhaser.h:93
float64 sample_rate_
Definition: Filter.h:113
void FilterPhaser::plot ( boolean  show_fc = false,
boolean  show_phase = false 
)

Definition at line 216 of file FilterPhaser.cc.

References frequencies_, max_delay_, Nsound::Filter::plot(), Nsound::Filter::sample_rate_, Nsound::Plotter::subplot(), and Nsound::Plotter::title().

217 {
218  char title[128];
219  sprintf(title,
220  "Phaser Frequency Response\n"
221  "sr = %0.1f Hz, f = %0.1f Hz, delay = %0.3f ms",
222  sample_rate_,
223  frequencies_[0],
224  max_delay_ * 1000.0);
225 
226  Filter::plot(show_phase);
227 
228  Plotter pylab;
229 
230  uint32 n_rows = 1;
231 
232  if(show_phase)
233  {
234  n_rows = 2;
235  }
236 
237  if(show_fc)
238  {
239  pylab.subplot(n_rows, 1, 1);
240  }
241 
242  pylab.title(title);
243 }
unsigned int uint32
Definition: Nsound.h:153
void title(const std::string &title, const std::string &kwargs="")
Add a title to the plot at the top and centered.
Definition: Plotter.cc:1127
std::vector< float64 > frequencies_
Definition: FilterPhaser.h:91
Axes subplot(const uint32 n_rows, const uint32 n_cols, const uint32 n, const std::string &kwargs="", Axes *sharex=NULL, Axes *sharey=NULL)
Creates a figure in a subplot, subplot(A, B, C, **kwargs)
Definition: Plotter.cc:1031
void plot(boolean show_phase=false)
Definition: Filter.cc:262
float64 sample_rate_
Definition: Filter.h:113
void FilterPhaser::reset ( )
virtual

Implements Nsound::Filter.

Definition at line 247 of file FilterPhaser.cc.

References filters_, n_stages_, Nsound::FilterAllPass::reset(), and waveform_position_.

248 {
249  for(uint32 i = 0; i < n_stages_; ++i)
250  {
251  filters_[i]->reset();
252  waveform_position_[i] = 0.0;
253  }
254 }
unsigned int uint32
Definition: Nsound.h:153
FilterAllPass ** filters_
Definition: FilterPhaser.h:90
std::vector< float64 > waveform_position_
Definition: FilterPhaser.h:93
void Nsound::Filter::setRealtime ( bool  flag)
inlineinherited

Definition at line 57 of file Filter.h.

References Nsound::Filter::is_realtime_.

57 {is_realtime_ = flag;}
bool is_realtime_
Definition: Filter.h:118
AudioStream Filter::filter ( const AudioStream x,
const float64 frequency 
)
inherited

Definition at line 76 of file Filter.cc.

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

77 {
78  if(!is_realtime_) reset();
79 
80  uint32 n_channels = x.getNChannels();
81 
82  if(is_realtime_ && n_channels > 1)
83  {
84  M_THROW("In real-time mode, a filter per audio channel must be used!");
85  }
86 
87  AudioStream y(x.getSampleRate(), n_channels);
88 
89  for(uint32 channel = 0; channel < n_channels; ++channel)
90  {
91  y[channel] = filter(x[channel], frequency);
92  }
93 
94  return y;
95 }
unsigned int uint32
Definition: Nsound.h:153
float64 getSampleRate() const
Returns the sample rate of the stream.
Definition: AudioStream.h:217
virtual void reset()=0
uint32 getNChannels(void) const
Returns the number of audio channels in the stream.
Definition: AudioStream.h:212
AudioStream filter(const AudioStream &x)
Definition: Filter.cc:53
#define M_THROW(message)
Definition: Macros.h:108
bool is_realtime_
Definition: Filter.h:118
AudioStream Filter::filter ( const AudioStream x,
const Buffer frequencies 
)
inherited

Definition at line 99 of file Filter.cc.

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

100 {
101  if(!is_realtime_) reset();
102 
103  uint32 n_channels = x.getNChannels();
104 
105  if(is_realtime_ && n_channels > 1)
106  {
107  M_THROW("In real-time mode, a filter per audio channel must be used!");
108  }
109 
110  AudioStream y(x.getSampleRate(), n_channels);
111 
112  for(uint32 channel = 0; channel < n_channels; ++channel)
113  {
114  y[channel] = filter(x[channel], frequency);
115  }
116 
117  return y;
118 }
unsigned int uint32
Definition: Nsound.h:153
float64 getSampleRate() const
Returns the sample rate of the stream.
Definition: AudioStream.h:217
virtual void reset()=0
uint32 getNChannels(void) const
Returns the number of audio channels in the stream.
Definition: AudioStream.h:212
AudioStream filter(const AudioStream &x)
Definition: Filter.cc:53
#define M_THROW(message)
Definition: Macros.h:108
bool is_realtime_
Definition: Filter.h:118
Buffer Filter::filter ( const Buffer x,
const float64 frequency 
)
inherited

Definition at line 140 of file Filter.cc.

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

141 {
142  if(!is_realtime_) reset();
143 
144  Buffer::const_iterator itor = x.begin();
145  Buffer::const_iterator end = x.end();
146 
147  Buffer y(x.getLength());
148 
149  while(itor != end)
150  {
151  y << filter(*itor, frequency);
152 
153  ++itor;
154  }
155 
156  return y;
157 }
uint32 getLength() const
Returns the number of samples in the Buffer.
Definition: Buffer.h:587
virtual void reset()=0
iterator end()
Retruns the itreator at the end of the Buffer.
Definition: Buffer.h:348
FloatVector::const_iterator const_iterator
Definition: Buffer.h:70
iterator begin()
Retruns the itreator at the start of the Buffer.
Definition: Buffer.h:285
AudioStream filter(const AudioStream &x)
Definition: Filter.cc:53
bool is_realtime_
Definition: Filter.h:118
A Buffer for storing audio samples.
Definition: Buffer.h:60
Buffer Filter::filter ( const Buffer x,
const Buffer frequencies 
)
inherited

Definition at line 161 of file Filter.cc.

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

162 {
163  if(!is_realtime_) reset();
164 
165  Buffer::const_circular_iterator freq = frequencies.cbegin();
166 
167  Buffer::const_iterator itor = x.begin();
168  Buffer::const_iterator end = x.end();
169 
170  Buffer y(x.getLength());
171 
172  while(itor != end)
173  {
174  y << filter(*itor, *freq);
175 
176  ++itor;
177  ++freq;
178  }
179 
180  return y;
181 }
circular_iterator cbegin()
Retruns the itreator at the start of the Buffer.
Definition: Buffer.h:318
uint32 getLength() const
Returns the number of samples in the Buffer.
Definition: Buffer.h:587
virtual void reset()=0
iterator end()
Retruns the itreator at the end of the Buffer.
Definition: Buffer.h:348
FloatVector::const_iterator const_iterator
Definition: Buffer.h:70
iterator begin()
Retruns the itreator at the start of the Buffer.
Definition: Buffer.h:285
AudioStream filter(const AudioStream &x)
Definition: Filter.cc:53
bool is_realtime_
Definition: Filter.h:118
A Buffer for storing audio samples.
Definition: Buffer.h:60
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().

186 {
187  uint32 fft_chunk_size = FFTransform::roundUp2(
188  static_cast<int32>(n_fft));
189 
190  uint32 n_samples = fft_chunk_size / 2 + 1;
191 
192  float64 f_step = (1.0 / (static_cast<float64>(fft_chunk_size) / 2.0))
193  * (sample_rate_ / 2.0);
194 
195  Buffer f_axis;
196 
197  float64 f = 0.0;
198 
199  for(uint32 i = 0; i < n_samples; ++i)
200  {
201  f_axis << f;
202  f += f_step;
203  }
204 
205  return f_axis;
206 };
unsigned int uint32
Definition: Nsound.h:153
double float64
Definition: Nsound.h:146
static int32 roundUp2(int32 raw)
Returns nearest power of 2 >= raw.
Definition: FFTransform.cc:274
A Buffer for storing audio samples.
Definition: Buffer.h:60
float64 sample_rate_
Definition: Filter.h:113
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().

211 {
213 
214 //~ fft.setWindow(HANNING);
215 
216  FFTChunkVector vec;
217 
218  vec = fft.fft(getImpulseResponse(), n_fft);
219 
220  return vec[0].getMagnitude();
221 }
Buffer getImpulseResponse(const uint32 n_samples=8192)
Definition: Filter.cc:225
A Class that performes the Fast Fouier Transfrom on a Buffer.
Definition: FFTransform.h:57
std::vector< FFTChunk > FFTChunkVector
Definition: FFTChunk.h:119
float64 sample_rate_
Definition: Filter.h:113
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().

226 {
227  if(!is_realtime_) reset();
228 
229  Buffer response(n_samples);
230 
231  response << filter(1.0);
232 
233  for(uint32 i = 1; i < n_samples; ++i)
234  {
235  response << filter(0.0);
236  }
237 
238  if(!is_realtime_) reset();
239 
240  return response;
241 }
unsigned int uint32
Definition: Nsound.h:153
virtual void reset()=0
AudioStream filter(const AudioStream &x)
Definition: Filter.cc:53
bool is_realtime_
Definition: Filter.h:118
A Buffer for storing audio samples.
Definition: Buffer.h:60
virtual uint32 Nsound::Filter::getKernelSize ( ) const
inlinevirtualinherited
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().

246 {
247  uint32 n_samples = static_cast<uint32>(sample_rate_ * 2);
248 
249  FFTransform fft(n_samples);
250 
251  FFTChunkVector vec;
252 
253  vec = fft.fft(getImpulseResponse(), n_samples);
254 
255  Buffer phase = vec[0].getPhase();
256 
257  return phase.subbuffer(0, phase.getLength() / 2 + 1);
258 }
Buffer subbuffer(uint32 start_index, uint32 n_samples=0) const
Slice the Buffer.
Definition: Buffer.cc:2073
unsigned int uint32
Definition: Nsound.h:153
uint32 getLength() const
Returns the number of samples in the Buffer.
Definition: Buffer.h:587
Buffer getImpulseResponse(const uint32 n_samples=8192)
Definition: Filter.cc:225
A Class that performes the Fast Fouier Transfrom on a Buffer.
Definition: FFTransform.h:57
A Buffer for storing audio samples.
Definition: Buffer.h:60
std::vector< FFTChunk > FFTChunkVector
Definition: FFTChunk.h:119
float64 sample_rate_
Definition: Filter.h:113
float64 Nsound::Filter::getSampleRate ( ) const
inlineinherited

Definition at line 102 of file Filter.h.

References Nsound::Filter::sample_rate_.

102 { return sample_rate_; };
float64 sample_rate_
Definition: Filter.h:113
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(), 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(), Nsound::FilterBandRejectFIR::plot(), Nsound::FilterBandRejectIIR::plot(), Nsound::FilterBandPassIIR::plot(), and Nsound::FilterParametricEqualizer::plot().

263 {
264  Buffer x = getFrequencyAxis();
266 
267  Plotter pylab;
268 
269  pylab.figure();
270 
271  uint32 n_rows = 1;
272  uint32 n_cols = 1;
273 
274  if(show_phase)
275  {
276  n_rows = 2;
277  }
278 
279  pylab.subplot(n_rows, n_cols, 1);
280 
281  // Frequency response
282  pylab.plot(x,fr, "blue");
283 
284  pylab.xlabel("Frequency (Hz)");
285  pylab.ylabel("Frequency Response (dB)");
286 
287  // Phase response
288  if(show_phase)
289  {
290  pylab.subplot(n_rows, n_cols, 2);
291 
292  Buffer pr = getPhaseResponse().getdB();
293 
294  pylab.plot(x,pr);
295 
296  pylab.xlabel("Frequency (Hz)");
297  pylab.ylabel("Phase Response (dB)");
298  }
299 
300  float64 ymax = fr.getMax();
301  float64 height = ymax - -60.0;
302 
303  pylab.ylim(-60.0, ymax + 0.05 * height);
304 }
unsigned int uint32
Definition: Nsound.h:153
void xlabel(const std::string &label, const std::string &kwargs="")
Add a label x axis.
Definition: Plotter.cc:1154
void plot(const Buffer &y, const std::string &fmt="", const std::string &kwargs="")
Plots the Buffer on the current figure.
Definition: Plotter.cc:765
void figure(const std::string &kwargs="") const
Creates a new figure window to plot in.
Definition: Plotter.cc:455
Buffer getPhaseResponse()
Definition: Filter.cc:245
double float64
Definition: Nsound.h:146
Axes subplot(const uint32 n_rows, const uint32 n_cols, const uint32 n, const std::string &kwargs="", Axes *sharex=NULL, Axes *sharey=NULL)
Creates a figure in a subplot, subplot(A, B, C, **kwargs)
Definition: Plotter.cc:1031
void ylim(const float64 &ymin, const float64 &ymax)
Definition: Plotter.cc:422
Buffer getFrequencyAxis(const uint32 n_fft=8192)
Definition: Filter.cc:185
void ylabel(const std::string &label, const std::string &kwargs="")
Add a label y axis.
Definition: Plotter.cc:1180
A Buffer for storing audio samples.
Definition: Buffer.h:60
Buffer getFrequencyResponse(const uint32 n_fft=8192)
Definition: Filter.cc:210
float64 getMax() const
Returns the maximum sample value in the Buffer.
Definition: Buffer.cc:951
Buffer getdB() const
Returns the Buffer in dB.
Definition: Buffer.h:487

Member Data Documentation

uint32 Nsound::FilterPhaser::n_stages_
protected

Definition at line 88 of file FilterPhaser.h.

Referenced by filter(), FilterPhaser(), operator=(), reset(), and ~FilterPhaser().

float64 Nsound::FilterPhaser::max_delay_
protected

Definition at line 89 of file FilterPhaser.h.

Referenced by filter(), FilterPhaser(), operator=(), and plot().

FilterAllPass** Nsound::FilterPhaser::filters_
protected

Definition at line 90 of file FilterPhaser.h.

Referenced by filter(), FilterPhaser(), operator=(), reset(), and ~FilterPhaser().

std::vector<float64> Nsound::FilterPhaser::frequencies_
protected

Definition at line 91 of file FilterPhaser.h.

Referenced by filter(), FilterPhaser(), operator=(), and plot().

Buffer* Nsound::FilterPhaser::waveform_
protected

Definition at line 92 of file FilterPhaser.h.

Referenced by FilterPhaser(), operator=(), and ~FilterPhaser().

std::vector<float64> Nsound::FilterPhaser::waveform_position_
protected

Definition at line 93 of file FilterPhaser.h.

Referenced by filter(), FilterPhaser(), operator=(), and reset().

float64 Nsound::Filter::sample_rate_
protectedinherited

Definition at line 113 of file Filter.h.

Referenced by filter(), Nsound::FilterCombLowPassFeedback::filter(), Nsound::FilterDelay::filter(), Nsound::FilterAllPass::FilterAllPass(), Nsound::FilterCombLowPassFeedback::FilterCombLowPassFeedback(), Nsound::FilterDelay::FilterDelay(), Nsound::FilterFlanger::FilterFlanger(), 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(), operator=(), Nsound::FilterLeastSquaresFIR::operator=(), Nsound::FilterFlanger::operator=(), Nsound::FilterIIR::operator=(), Nsound::FilterLowPassMoogVcf::plot(), 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(), Nsound::FilterBandRejectFIR::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
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
bool Nsound::Filter::is_realtime_
protectedinherited

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