Nsound::DrumBD01 Class Reference

Class DrumBD01. More...

#include <Nsound/DrumBD01.h>

Inheritance diagram for Nsound::DrumBD01:

Public Member Functions
	DrumBD01 (const float64 &sample_rate)
	Creates a Drum. More...
	~DrumBD01 ()
	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...
AudioStream	play (const float64 &duration, const float64 &frequency, const float64 &velocity)
	Static play method. More...
std::string	getInfo ()
	Nsound::DrumBD01 information. More...

Protected Attributes
float64	sample_rate_

Detailed Description

Class DrumBD01.

Definition at line 50 of file DrumBD01.h.

Constructor & Destructor Documentation

DrumBD01::DrumBD01

(

const float64 &

sample_rate

)

Creates a Drum.

Definition at line 40 of file DrumBD01.cc.

    :
    Instrument(sample_rate){}

DrumBD01::~DrumBD01

(

)

Destructor.

Definition at line 46 of file DrumBD01.cc.

{}

Member Function Documentation

AudioStream DrumBD01::play ( )

virtual

Plays a demo for this instrument.

Implements Nsound::Instrument.

Definition at line 50 of file DrumBD01.cc.

References Nsound::Instrument::sample_rate_.

Referenced by my_main(), and play().

{
    AudioStream y(sample_rate_, 1);

    y << play(0.5, 50.0, 0.25)
      << play(0.5, 50.0, 0.50)
      << play(0.5, 50.0, 0.75)
      << play(0.5, 50.0, 1.0);

    return y;
}

AudioStream DrumBD01::play ( const float64 &  duration, const float64 &  frequency  )

virtual

Plays a static note for this instrument.

Implements Nsound::Instrument.

Definition at line 64 of file DrumBD01.cc.

References play().

{
    return play(duration, frequency, 1.0);
}

AudioStream DrumBD01::play	(	const float64 &	duration,
		const float64 &	frequency,
		const float64 &	velocity
	)

Static play method.

Definition at line 74 of file DrumBD01.cc.

References Nsound::Generator::drawDecay(), Nsound::Generator::drawLine(), Nsound::FilterLowPassIIR::filter(), Nsound::Generator::generate(), Nsound::Buffer::getSqrt(), Nsound::Buffer::limit(), Nsound::Buffer::normalize(), Nsound::Instrument::sample_rate_, and Nsound::Generator::whiteNoise().

{
    float64 v = velocity;

    if(v > 1.0) v = 1.0;
    if(v < 0.0) v = 0.0;

    float64 fdec = 0.025 * (v * v + 0.1072);

    // Create a sine generator
    Sine sin(sample_rate_);

    Buffer kcps1 = sin.drawDecay(10.0*fdec, 7.0)
                << sin.drawLine(duration - fdec, 0.0, 0.0);

    Buffer kcps2 = sin.drawDecay(10.0*0.32, 7.0)
                << sin.drawLine(duration - 0.32, 0.0, 0.0);

    Buffer kcps = (4.3333 * kcps1 + kcps2) * frequency;

    Buffer klpf = sin.drawDecay(10.0*0.04, 7.0)
               << sin.drawLine(duration - 0.04, 0.0, 0.0);

    Buffer klpf2 = 8.0 * sin.drawDecay(10.0*0.0005, 7.0)
                << sin.drawLine(duration - 0.0005, 0.0, 0.0);

    Buffer kamp = 1.0
                - 0.5*sin.drawDecay(0.15, 7.0)
               << sin.drawLine(duration - 0.15, 1.0, 1.0);

    Buffer a1 = sin.generate(duration, kcps);

    a1.limit(-0.25, 0.25);

    Buffer freq = kcps * (0.5 + klpf2);

    FilterTone tone(sample_rate_, freq[0]);

    a1 = tone.filter(a1, freq);

    Buffer a2 = sin.whiteNoise(duration) * sin.whiteNoise(duration);

    tone.makeKernel(500.0);

    a2 -= tone.filter(a2);

    freq = 4.0 * (klpf + klpf2) * kcps;

    FilterLowPassIIR lpf(sample_rate_, 2, freq[0], 0.01);

    a1 = lpf.filter(kamp * a1, freq);

    a2 = lpf.filter(kamp * a2, kcps);
    a2 *= 5.0 * klpf.getSqrt();

    a1 += a2 * 1.0;

    a1.normalize();

    Buffer env = sin.drawLine(duration - 0.01, 1.0, 1.0)
              << sin.drawLine(0.005, 1.0, 0.0)
              << sin.drawLine(0.005, 0.0, 0.0);

    AudioStream as(sample_rate_, 1);

    as << env * a1;

    return as;
}

std::string Nsound::DrumBD01::getInfo ( )

inlinevirtual

Nsound::DrumBD01 information.

Implements Nsound::Instrument.

Definition at line 73 of file DrumBD01.h.

    {
        return
            "Nsound::DrumBD01 by Nick Hilton on 2009-05-02\n"
            "Simulates a bass drum.  Based on a Csound drum.\n"
            "source: http://www.csounds.com/istvan/html/drums.html\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(), play(), Nsound::FluteSlide::play(), Nsound::GuitarBass::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/DrumBD01.h
• Nsound/DrumBD01.cc