Nsound::FilterDC Class Reference

#include <Nsound/FilterDC.h>

Public Member Functions
	FilterDC (const float64 &feedback_gain)
AudioStream	filter (const AudioStream &x)
Buffer	filter (const Buffer &x)
float64	filter (const float64 &x)
Protected Attributes
float64	feedback_gain_
float64	last_input_
float64	last_output_

Detailed Description

Definition at line 45 of file FilterDC.h.

Constructor & Destructor Documentation

FilterDC::FilterDC ( const float64 & feedback_gain )

Definition at line 37 of file FilterDC.cc.

00039     :
00040     feedback_gain_(feedback_gain),
00041     last_input_(0.0),
00042     last_output_(0.0)
00043 {
}

Member Function Documentation

AudioStream FilterDC::filter ( const AudioStream & x )

Definition at line 48 of file FilterDC.cc.

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

Referenced by filter(), and Nsound::Pluck::generate().

00049 {
00050     uint32 n_channels = x.getNChannels();
00051 
00052     AudioStream y(x.getSampleRate(), n_channels);
00053 
00054     for(uint32 channel = 0; channel < n_channels; ++channel)
00055     {
00056         y[channel] = filter(x[channel]);
00057     }
00058 
00059     return y;
00060 }

Buffer FilterDC::filter ( const Buffer & x )

Definition at line 66 of file FilterDC.cc.

References filter(), and Nsound::Buffer::getLength().

00067 {
00068     uint32 n_samples = x.getLength();
00069 
00070     Buffer y;
00071 
00072     for(uint32 n = 0; n < n_samples; ++n)
00073     {
00074         y << filter(x[n]);
00075     }
00076 
00077     return y;
00078 }

float64 FilterDC::filter ( const float64 & x )

Definition at line 83 of file FilterDC.cc.

References feedback_gain_, last_input_, and last_output_.

00084 {
00085     float64 out = x - last_input_ + feedback_gain_ * last_output_;
00086 
00087     last_input_ = x;
00088     last_output_ = out;
00089 
00090     return out;
00091 }