Minim - Duration of maximum peaks

Core Library Questions

mikailis

Minim - Duration of maximum peaks

in Core Library Questions • 3 years ago

hi

i am very new to processing enviroment and i have a very simple and basic question..

i am using minim.FFT to find the peaks from an audio source.

how i can everytime compare the last two peaks in order to find how much time has
passed since another peak occurs.

i tried to store the values to an array and then compare the elements but had no lack.

i know its simple but i dont have the programming knowledge yet to do this.

here is a part of my code that i have stucked to

fft.forward(player.mix);//FFT ON THE BUFFER

for(int i=0;i<spectrum.length;i++)
{

spectrum[i] = (fft.getBand(i));//FILL THE ARRAY WITH THE SPECTRUM

line(i,height,i,height-fft.getBand(i));//DRAW THE SPECTRUM

if ((fft.getBand(i)>fft.getBand(maximum))&&fft.getBand(i)>120)
{
maximum=i;
currMaxBand = fft.getBand(maxim);
count=millis()-start;

}

}
start = millis();

my purpose is to find the the time that every maxband lasts.

can anyone help me?

Thank you..

Replies(3)

antiplast..

Re: Minim - Duration of maximum peaks

3 years ago

The FFT bands don't "last". They just move high and down.

Maybe you want to know how much time has passed, for each band, before it gets over a threshold again? Here is an example (I didn't try to run the code below) for one band :

Copy code

int threshold = 120;
int peakStart = 0;
fft.forward(player.mix);
value = fft.getBand(0); // let's try with the first band
if (value < threshold) {
if (peakStart > 0) {
int timeEllapsed = millis() - peakStart;
}
peakStart = 0;
}
else if (value > threshold && peakStart == 0) {
peakStart = millis();
}

mikailis

Re: Minim - Duration of maximum peaks

3 years ago

Thank you antiplastik..

I will check it out and write back

Cheers

mikailis

Re: Minim - Duration of maximum peaks

3 years ago

Hi antiplastic..

I want this threshold value everytime to be the fft.getBand(maximum)

Copy code

for(int i=0;i<fft.specSize();i++)
{
line(i,height,i,height-fft.getBand(i));
{
if (fft.getBand(i)>fft.getBand(maximum)
{maximum=i;}
}

so while this value remains the same a counter will count the time passed from that peak
and if it changes it will go back to zero and so on.

Do you think thats possible?

Thank you

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