arduino-library-audio

Arduino Audio Library for stm32 platform

There is one Audio library for Arduino Due (https://github.com/arduino-org/Arduino/tree/master/libraries/Audio). This library has only three "commands"

1. begin
2. prepare
3. write

This commands are not sufficient for Audio Interface of Otto board because there are no commands to use the microphones and to select the output channel.

For this reason we can use Processing Sound library: https://processing.org/reference/libraries/sound/

AUDIO API definition

AudioDevice

Constructor: AudioDevice(theParent, sampleRate, bufferSize)
Description: Audio Device allows for configuring the audio server. If you need a low latency server you can reduce the buffer size. Allowed values are power of 2. For changing the sample rate pass the appropriate value in the constructor.

Example:

import processing.sound.*;
AudioDevice myAudioServer;

void setup() {
   myAudioServer = new AudioDevice(this, 44100, 128);
 }

 void loop() {
 }

AudioIn

Constructor: AudioIn(theParent, in)
Description: Audio Device allows for configuring the audio server. If you need a low AudioIn let's you grab the audio input
Methods:
start(): Starts the input stream.
play(): Start the Input Stream and route it to the Audio Hardware Output
set(): Set multiple parameters at once.
amp(): Change the amplitude/volume of the input steam.
add(): Offset the output of the input stream by given value
pan(): Move the sound in a stereo panorama
stop(): Stop the input stream.

Example:

import processing.sound.*;
AudioIn in;

void setup() {

   // Create the Input stream
   in = new AudioIn(this, 0);
   in.play();
}

void loop() {
}

SoundFile

Constructor: SoundFile(theParent, path)
Description: This is a Soundfile Player which allows to play back and manipulate soundfiles. Supported formats are: WAV, AIF/AIFF, MP3.
Methods:
frames(): Returns the number of frames/samples of the sound file.
sampleRate(): Returns the sample rate of the soundfile.
channels(): Returns the number of channels in the soundfile.
duration(): Returns the duration of the the soundfile.
play(): Starts the playback of a soundfile. Only plays the soundfile once.
loop(): Starts the playback of a soundfile to loop.
jump(): Jump to a specific position in the file while continuing to play.
cue(): Cues the playhead to a fixed position in the soundfile. Note that the time parameter supports only integer values.
set(): Set multiple parameters at once
pan(): Move the sound in a stereo panorama, only supports Mono Files
rate(): Change the playback rate of the soundfile.
amp(): Changes the amplitude/volume of the player.
add(): Offset the output of the player by given value
stop(): Stops the player

Example:

import processing.sound.*;
SoundFile file;

void setup() {

  // Load a soundfile from the /data folder of the
  // sketch and play it back
  file = new SoundFile(this, "sample.mp3");
  file.play();
}

void loop() {
}

LowPass

Constructor: LowPass(parent)
Description: This is a low pass filter.
Methods:
process(): Start the filter
stop(): Stop the filter
freq(): Sets the cut off frequency for the filter

Example:

 import processing.sound.*;

 WhiteNoise noise;
 LowPass lowPass;

 float amp=0.0;

 void setup() {

   // Create a noise generator and a bandpass filter
   noise = new WhiteNoise(this);
   lowPass = new LowPass(this);

   noise.play(0.5);
   lowPass.process(noise, 800);
 }

 void loop() {
 }

HighPass

Constructor: HighPass(parent)
Description: This is a high pass filter.
Methods:
- process(): Start the filter
- stop(): Stop the filter
- freq(): Sets the cut off frequency for the filter

Example:

 import processing.sound.*;

 WhiteNoise noise;
 HighPass highPass;

 float amp=0.0;

 void setup() {

    // Create a noise generator and a bandpass filter
    noise = new WhiteNoise(this);
    highPass = new HighPass(this);

    noise.play(0.5);
    highPass.process(noise, 5000);
  }

  void loop() {
  }

BandPass

Constructor: BandPass(parent)
Description: This is a high pass filter.
Methods:
process(): Start the Filter
set(): Sets frequency and bandwidth of the filter with one method.
freq(): Set the cutoff frequency for the filter
bw():Set the bandwidth for the filter.
stop(): Stops the filter.

Example:

 import processing.sound.*;

 WhiteNoise noise;
 BandPass bandPass;

 float amp=0.0;

 void setup() {

 // Create a noise generator and a bandpass filter
 noise = new WhiteNoise(this);
 bandPass = new BandPass(this);

  noise.play(0.5);
  bandPass.process(noise, 100, 50);
 }

 void loop() {
 }

Delay

Constructor: Delay(theParent)
Description: This is a simple Delay Effect.
Methods:
process(): Start the delay effect
set(): Set delay time and feedback values at once
time(): Changes the delay time of the effect.
feedback(): Change the feedback of the delay effect.
stop(): Stop the delay effect.

Example:

 import processing.sound.*;

 AudioIn in;
 Delay delay;

 void setup() {

   // create the input stream
   in = new AudioIn(this, 0);

   // create a delay effect
   delay = new Delay(this);

   // start the input stream
   in.play();

   // Patch the delay
   delay.process(in, 5);
   delay.time(0.5);
 }

 void loop() {
 }

Reverb

Constructor: Reverb(theParent)
Description: This is a simple Reverb Effect.
Methods:
process(): Start the reverb effect.
set(): Set multiple parameters at once
room(): Change the room size of the reverb effect.
damp(): Change the dampening of the reverb effect
wet(): Change the dry/wet ratio of the delay effect
stop(): Stop the reverb effect

Example:

 import processing.sound.*;

 AudioIn in;
 Reverb reverb;

 void setup() {

   // create the input stream
   in = new AudioIn(this, 0);

   // create a reverb effect
   reverb = new Reverb(this);

   // start the input stream
   in.play();
   reverb.process(in);
 }

 void loop() {
 }

Amplitude

Constructor: Amplitude(theParent)
Description: This is a volume analyzer. It calculates the root mean square of the amplitude of each audio block and returns that value.
Methods:
input(): Defines the audio input source of the amplitude analyzer.
analyze(): Queries a value from the analyzer and returns a float between 0. and 1.

Example:

 import processing.sound.*;
 Amplitude amp;
 AudioIn in;

 void setup() {
   // Create an Input stream which is routed into the Amplitude analyzer
   amp = new Amplitude(this);
   in = new AudioIn(this, 0);
   in.start();
   amp.input(in);
 }

 void loop() {
   println(amp.analyze());
 }

FFT

Constructor: FFT(theParent, fftSize)
Description: This is a Fast Fourier Transform (FFT) analyzer. It calculates the normalized power spectrum of an audio stream the moment it is queried with the analyze() method.
Methods:
input(): Define the audio input for the analyzer.
analyze(): Queries a value from the analyzer and returns a vector the size of the pre-defined number of bands.

Example:

 import processing.sound.*;

 FFT fft;
 AudioIn in;
 int bands = 512;
 float[] spectrum = new float[bands];

 void setup() {
   Serial.begin(9600)

   // Create an Input stream which is routed into
   // the Amplitude analyzer
   fft = new FFT(this, bands);
   in = new AudioIn(this, 0);

   // start the Audio Input
   in.start();

   // patch the AudioIn
   fft.input(in);
 }

 void loop() {
   fft.analyze(spectrum);

   for(int i = 0; i < bands; i++){
   // The result of the FFT is normalized
   // print the value for frequency i band
   Serial.println(spectrum[i]);
   }
}

WhiteNoise

Constructor: WhiteNoise(theParent)
Description: This is a White Noise Generator. White Noise has a flat spectrum.
Methods:
play(): Start the generator
set(): Set multiple parameters at once.
amp(): Change the amplitude/volume of the generator
add(): Offset the generator by a given Value
pan(): Move the sound in a stereo panorama
stop(): Stop the generator

Example:

 import processing.sound.*;
 WhiteNoise noise;

 void setup() {
   // Create the noise generator
   noise = new WhiteNoise(this);
   noise.play();
 }

 void loop() {
 }

PinkNoise

Constructor: PinkNoise(theParent)
Description: This is a Pink Noise Generator. Pink Noise has a decrease of 3dB per octave.
Methods:
play(): Start the generator
set(): Set multiple parameters at once.
amp(): Change the amplitude/volume of the generator
add(): Offset the generator by a given Value
pan(): Move the sound in a stereo panorama
stop(): Stop the generator

Example:

 import processing.sound.*;
 PinkNoise noise;

 void setup() {
   // Create the noise generator
   noise = new PinkNoise(this);
   noise.play();
 }

 void loop() {
 }

BrownNoise

Constructor: BrownNoise(theParent)
Description: This is a Brown Noise Generator. Brown Noise has a decrease of 6dB per octave.
Methods:
play(): Start the generator
set(): Set multiple parameters at once.
amp(): Change the amplitude/volume of the generator
add(): Offset the generator by a given Value
pan(): Move the sound in a stereo panorama
stop(): Stop the generator

Example:

 import processing.sound.*;
 BrownNoise noise;

 void setup() {
   // Create the noise generator
   noise = new BrownNoise(this);
   noise.play();
 }

 void loop() {

SinOsc

Constructor: SinOsc(theParent)
Description: This is a simple Sine Wave Oscillator.
Methods:
play(): Starts the oscillator
set(): Set multiple parameters at once
freq(): Set the frequency of the oscillator in Hz.
__amp() __: Set the amplitude/volume of the oscillator
add(): Offset the output of the oscillator by given value
pan(): Move the sound in a stereo panorama
__stop() __: Stop the oscillator.

Example:

 import processing.sound.*;
 SinOsc sine;

 void setup() {
   // Create the sine oscillator.
   sine = new SinOsc(this);
   sine.play();
 }

 void loop() {
}

SawOsc

Constructor: SawOsc(theParent)
Description: This is a simple Sawtooth Wave Oscillator.
Methods:
play(): Starts the oscillator
set(): Set multiple parameters at once
freq(): Set the frequency of the oscillator in Hz.
amp(): Set the amplitude/volume of the oscillator
add(): Offset the output of the oscillator by given value
pan(): Move the sound in a stereo panorama
stop(): Stop the oscillator.

Example:

 import processing.sound.*;
 SawOsc saw;

void setup() {
   // Create sawtooth wave oscillator.
   saw = new SawOsc(this);
   saw.play();
  }

 void loop() {
 }

SqrOsc

Constructor: SqrOsc(theParent)
Description: This is a simple Square Wave Oscillator.
Methods:
play(): Starts the oscillator
set(): Set multiple parameters at once
freq(): Set the frequency of the oscillator in Hz.
amp(): Set the amplitude/volume of the oscillator
add(): Offset the output of the oscillator by given value
pan(): Move the sound in a stereo panorama
stop(): Stop the oscillator.

Example:

 import processing.sound.*;
 SqrOsc square;

void setup() {
   // Create square wave oscillator.
   square = new SqrOsc(this);
   square.play();
  }

 void loop() {
 }

TriOsc

Constructor: TriOsc(theParent)
Description: This is a simple Triangle Wave Oscillator.
Methods:
play(): Starts the oscillator
set(): Set multiple parameters at once
freq(): Set the frequency of the oscillator in Hz.
amp(): Set the amplitude/volume of the oscillator
add(): Offset the output of the oscillator by given value
pan(): Move the sound in a stereo panorama
stop(): Stop the oscillator.

Example:

 import processing.sound.*;
 TriOsc tiangle;

void setup() {
   // Create triangle wave oscillator.
   triangle = new TriOsc(this);
   triangle.play();
  }

 void loop() {
 }

Pulse

Constructor: Pulse(theParent)
Description: This is a simple Pulse Oscillator.
Methods:
play(): Starts the oscillator
set(): Set multiple parameters at once
freq(): Set the frequency of the oscillator in Hz.
amp(): Set the amplitude/volume of the oscillator
add(): Offset the output of the oscillator by given value
pan(): Move the sound in a stereo panorama
stop(): Stop the oscillator.

Example:

 import processing.sound.*;
 Pulse pulse;

 void setup() {
   // Create and start the sine oscillator.
   pulse = new Pulse(this);

   //Start the Pulse Oscillator.
   pulse.play();
 }

 void loop() {
 }

Env

Constructor: Env(theParent)
Description: This is a ASR Envelope Generator.
Methods:
play(): Triggers the envelope

Example:

 import processing.sound.*;

 TriOsc triOsc;
 Env env;

 float attackTime = 0.001;
 float sustainTime = 0.004;
 float sustainLevel = 0.3;
 float releaseTime = 0.4;

 void setup() {
    // Create triangle wave
   triOsc = new TriOsc(this);

   // Create the envelope
   env  = new Env(this);
 }

 void loop() {
 }

Name		Name	Last commit message	Last commit date
Latest commit History 14 Commits
.gitignore		.gitignore
README.md		README.md

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Repository files navigation

arduino-library-audio

AUDIO API definition

AudioDevice

AudioIn

SoundFile

LowPass

HighPass

BandPass

Delay

Reverb

Amplitude

FFT

WhiteNoise

PinkNoise

BrownNoise

SinOsc

SawOsc

SqrOsc

TriOsc

Pulse

Env

About

Releases

Packages

Contributors 2

bcmi-labs/arduino-library-audio

Folders and files

Latest commit

History

Repository files navigation

arduino-library-audio

AUDIO API definition

AudioDevice

AudioIn

SoundFile

LowPass

HighPass

BandPass

Delay

Reverb

Amplitude

FFT

WhiteNoise

PinkNoise

BrownNoise

SinOsc

SawOsc

SqrOsc

TriOsc

Pulse

Env

About

Resources

Stars

Watchers

Forks

Releases

Packages 0

Contributors 2

Packages