Nsound::GuitarBass Class Reference

Class Drum. More...

#include <Nsound/GuitarBass.h>

Inheritance diagram for Nsound::GuitarBass:

Public Member Functions
	GuitarBass (const float64 &sample_rate)
	Creates a Bass Kick Drum. More...
	~GuitarBass ()
	Destructor. More...
AudioStream	play ()
	Plays a demo for this instrument. More...
AudioStream	play (const float64 &duration, const float64 &frequency)
	Plays a static note for this instrument. More...
std::string	getInfo ()
	Nsound::GuitarBass information. More...

Protected Attributes
float64	sample_rate_

Detailed Description

Class Drum.

Definition at line 50 of file GuitarBass.h.

Constructor & Destructor Documentation

GuitarBass::GuitarBass

(

const float64 &

sample_rate

)

Creates a Bass Kick Drum.

Definition at line 42 of file GuitarBass.cc.

    :
    Instrument(sample_rate)
{
}

GuitarBass::~GuitarBass

(

)

Destructor.

Definition at line 50 of file GuitarBass.cc.

{
}

Member Function Documentation

AudioStream GuitarBass::play ( )

virtual

Plays a demo for this instrument.

Implements Nsound::Instrument.

Definition at line 56 of file GuitarBass.cc.

References play(), and Nsound::Instrument::sample_rate_.

Referenced by main(), play(), and Nsound::AudioPlayback::scanDevices().

{
    AudioStream y(sample_rate_, 1);

    //              duration,   freq
    y <<        play(0.450,    61.734)
      << 0.90 * play(0.300,   123.467)
      << 0.95 * play(0.150,    92.491)
      << 0.80 * play(0.450,    61.734)
      << 0.80 * play(0.450,    46.245)
      << 0.80 * play(0.450,    55.000)
      << 0.80 * play(0.450,    61.734)
      <<        play(0.450,    73.414)
      <<        play(0.650,    61.734);

    return y;
}

AudioStream GuitarBass::play ( const float64 &  duration, const float64 &  frequency  )

virtual

Plays a static note for this instrument.

Implements Nsound::Instrument.

Definition at line 76 of file GuitarBass.cc.

References Nsound::Buffer::cbegin(), Nsound::Generator::drawLine(), Nsound::FilterTone::filter(), Nsound::FilterBandPassIIR::filter(), Nsound::Generator::generate(), Nsound::DelayLine::read(), Nsound::Instrument::sample_rate_, and Nsound::DelayLine::write().

{
    Triangle tri(sample_rate_);

    Buffer outenv =  tri.drawLine(0.01, 0.0, 1.0)
                  << tri.drawLine(duration - 0.11, 1.0, 1.0)
                  << tri.drawLine(0.11, 1.0, 0.0);

    // draw a tirangle envlope
    float64 triangle_duration = 1.0 / (2.0 * frequency);
    Buffer triangle =  -1.0 * tri.generate(triangle_duration, 2.0 * frequency)
                    << tri.drawLine(duration - triangle_duration, 0.0,0.0);

    // this envlope is for the body resonance
    Buffer envres =  tri.drawLine(0.1, 0.0, 1.0)
                  << tri.drawLine(duration - 0.1, 1.0, 1.0);

    FilterTone tone(sample_rate_, frequency * frequency / 10.0);

    DelayLine delay(sample_rate_, 1.0 / frequency);

    uint32 n_samples = static_cast<uint32>(duration * sample_rate_);

    float64 filter_out = 0.0;

    AudioStream y(sample_rate_, 1);

    Buffer::circular_iterator tri_iter = triangle.cbegin();

    filter_out = tone.filter(0);
    for(uint32 n = 0; n < n_samples; ++n, ++tri_iter)
    {
        delay.write(filter_out + *tri_iter);
        filter_out = tone.filter(delay.read());
        y << filter_out;
    }

    // Add some resonance from the body

    FilterBandPassIIR body1(sample_rate_, 2, 120.0, 200.0, 0.01);
    FilterBandPassIIR body2(sample_rate_, 2,  60.0, 100.0, 0.01);

    y += 0.0001  * body1.filter(y)
       + 0.00004 * body2.filter(y);

    y *= outenv;

    return y;
}

std::string Nsound::GuitarBass::getInfo ( )

inlinevirtual

Nsound::GuitarBass information.

Implements Nsound::Instrument.

Definition at line 67 of file GuitarBass.h.

    {
        return
            "Nsound::GuitarBass by Nick Hilton\n\n"

            "Based on physical models written in Csound by Hans Mikelson.\n\n"

            ";BASS PHYSICAL MODEL\n"
            "          instr     2\n"
            "\n"
            "; INITIALIZATIONS\n"
            "ifqc      =         cpspch(p5)\n"
            "kcount  init   0\n"
            "abody1  init   0\n"
            "abody2  init   0\n"
            "adline  init   0\n"
            "\n"
            "; ENVELOPES\n"
            ";**********\n"
            "; FILTER ENVELOPE\n"
            "kenvflt linseg      0, .01, 1, p3-.11, 1, .1, 0\n"
            "; THIS ENVELOPE LOADS THE STRING WITH A TRIANGLE WAVE.\n"
            "kenvstr linseg      0, 1/ifqc/8, -p4/2, 1/ifqc/4, p4/2, 1/ifqc/8, 0, p3-1/ifqc, 0\n"
            "; THIS ENVELOPE IS FOR THE BODY RESONANCE\n"
            "kenvres linseg      0, .1, 1, p3-.1, 1\n"
            "\n"
            "; DELAY LINE WITH FILTERED FEEDBACK\n"
            "afiltr    tone      adline, ifqc*ifqc/10\n"
            "adline    delay     afiltr + kenvstr, 1/ifqc\n"
            "\n"
            "; RESONANCE OF THE BODY\n"
            "abody1    reson     afiltr, 160, 40\n"
            "abody2    reson     afiltr, 80, 20\n"
            "\n"
            "aout      =         afiltr + .0001*kenvres*abody1 + .00004*kenvres*abody2\n"
            "          out  aout * kenvflt\n"
            "          endin\n";
    };

Member Data Documentation

float64 Nsound::Instrument::sample_rate_

protectedinherited

Definition at line 76 of file Instrument.h.

Referenced by Nsound::Hat::Hat(), Nsound::Hat::operator=(), Nsound::Clarinet::play(), Nsound::DrumBD01::play(), Nsound::FluteSlide::play(), play(), Nsound::DrumKickBass::play(), Nsound::OrganPipe::play(), and Nsound::Hat::play().

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

• Nsound/GuitarBass.h
• Nsound/GuitarBass.cc