Very fast react with using Array!

emily.m

Very fast react with using Array!

in Contributed Library Questions • 1 year ago

Can we do something with array to make it work faster?

I have an array with 8 elements.

I can call each of these elements separately by key pressing.

I want to make this program react very fast when a key is pressed and the sound can be heard as soon as a key pressed. How can I do it?

I don’t want to write lots of arrays and separate the original array!

Here is the program

import krister.Ess.*;
AudioChannel myChannel;
TriangleWave myWave;
Envelope myEnvelope;
int numNotes = 200;
int noteDuration = 200;
float[] rawSequence = {
293.6648,//(a)
329.62756,//(s)
391.9955,//(d)
369.99445,//(f)
439.99997,//(z)
587.3294,//(x)
392.62756,//(c)
523.25116//(v)
};
int time = 0;
int current = 0;
void setup()
{
size(300,300);
Ess.start(this);
myChannel = new AudioChannel();
myChannel.initChannel(myChannel.frames(rawSequence.length * noteDuration));
//int current = 0;
myWave = new TriangleWave(480, 0.3);
EPoint[] myEnv = new EPoint[3];
myEnv[0] = new EPoint(0,0);
myEnv[1] = new EPoint(0.25,1);
myEnv[2] = new EPoint(2,0);
myEnvelope = new Envelope(myEnv);
// int time = 0;

}


void draw()
{

    int begin = myChannel.frames(time);
    int e = int(noteDuration*0.8);
    int end = myChannel.frames(e);
    myWave.generate(myChannel, begin, end);
    myEnvelope.filter(myChannel, begin, end);
     if((keyPressed == true)&&(key =='a'))
      {
        myWave.frequency = rawSequence[0];
      myChannel.play(); }

     if((keyPressed == true)&&(key =='s'))
     {
       myWave.frequency = rawSequence[1];
     myChannel.play();}

     if((keyPressed == true)&&(key =='d'))
     {
       myWave.frequency = rawSequence[2];
     myChannel.play();}

     if((keyPressed == true)&&(key =='f'))
     {
       myWave.frequency = rawSequence[3];
     myChannel.play();}

     if((keyPressed == true)&&(key =='z'))
     {
       myWave.frequency = rawSequence[4];
     myChannel.play();}

     if((keyPressed == true)&&(key =='x'))
     {
       myWave.frequency = rawSequence[5];
     myChannel.play();}

   if((keyPressed == true)&&(key =='c'))
     {
       myWave.frequency = rawSequence[6];
     myChannel.play();}

     if((keyPressed == true)&&(key =='c'))
     {
       myWave.frequency = rawSequence[7];
     myChannel.play();}
}
public void stop()
{
Ess.stop();
super.stop();
}

Replies(3)

quarks

Re: Very fast react with using Array!

1 year ago

Whenever I have used sound there has always been some delay between asking for a sound to be played and when the sound has started playing (latency) and I never found a solution. Hopefully someone else will be able to help you on that.

What I offer is some suggestions simplify the code and reduce the number of if statements

In above code add

String s = "asdfzxcv";

and in draw() replace all the if statements with this code

if (keyPressed == true) {
int index = notes.indexOf(key);
if(index >= 0) {
myWave.frequency = rawSequence[index];
}
myChannel.play();
}

hellochar

Re: Very fast react with using Array!

1 year ago

Part of the problem is that the Processing framework only calls "draw" once per 60 seconds (ideally); this creates as much as 16 milliseconds of delay between when you physically press the button and when Ess generates sound. You might get better performance by placing your if statements into the keyPressed() method but don't expect it to fix all your problems.

Unfortunately the bottleneck here isn't in arrays or even language constructs; in my experience the Java language has always been subpar for music generation. But even aside from that, the very manner in which sound is created on a computer requires a certain delay; this may be as small as 2-3 milliseconds or as long as 100 milliseconds. I also have yet to find a good fix to this issue. I know it's certainly doable since programs like Ableton work without any noticeable delay; then again, that's programmed in a lower level language (C/C++ most likely).

emily.m

Cacophony! sound question.

1 year ago

Thanks guys,

Separating each frequency and putting each one in one array make it better somehow but not much,

I have another question!

Each of these frequencies has noise and we cannot hear the sound smoothly!

Pressing “a” for example (frequency 294 Re) has very bad sound, what can I do to make the sound play better? Is there a way to do that?

import krister.Ess.*;
AudioChannel myChannel;
TriangleWave myWave;
Envelope myEnvelope;
int numNotes = 00;
int noteDuration = 500;
float[] a = {294};//(a) Re0
float[] s = {330};//(s)Mi0
float[] d ={392};//(d)Sol0
float[] f ={370};//(f)Sol_b0
float[] z ={440};//(z)La0
float[] x ={587};//(x)Re1
float[] c ={392};//(c) sol0
float[] v ={523};//(v)Do1

int time = 0;
//int current = 0;
void setup()
{
size(100,100);
Ess.start(this);
myChannel = new AudioChannel();

myChannel.initChannel(myChannel.frames( noteDuration));

myWave = new TriangleWave(180, 1.9);
EPoint[] myEnv = new EPoint[3];
myEnv[0] = new EPoint(0,0);
myEnv[1] = new EPoint(0.25,1);
myEnv[2] = new EPoint(2,0);
myEnvelope = new Envelope(myEnv);
}

void draw()
{

    int begin = myChannel.frames(time);
    int e = int(noteDuration*0.8);
    int end = myChannel.frames(e);
    myWave.generate(myChannel, begin, end);
    myEnvelope.filter(myChannel, begin, end);

     if((keyPressed == true)&&(key =='a'))
      {
        myWave.frequency = a[0];
      myChannel.play(); }

     if((keyPressed == true)&&(key =='s'))
     {
       myWave.frequency = s[0];
     myChannel.play();}

     if((keyPressed == true)&&(key =='d'))
     {
       myWave.frequency = d[0];
     myChannel.play();}

     if((keyPressed == true)&&(key =='f'))
     {
       myWave.frequency = f[0];
     myChannel.play();}

     if((keyPressed == true)&&(key =='z'))
     {
       myWave.frequency = z[0];
     myChannel.play();}

     if((keyPressed == true)&&(key =='x'))
     {
       myWave.frequency = x[0];
     myChannel.play();}

   if((keyPressed == true)&&(key =='c'))
     {
       myWave.frequency = c[0];
     myChannel.play();}

     if((keyPressed == true)&&(key =='v'))
     {
       myWave.frequency = v[0];
     myChannel.play();}
}

public void stop()
{
Ess.stop();
super.stop();
}

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