Spectral Analyser / Ever made one?

[Chazrox]

Does anybody have any good advice on where to start making a spectral analyzer? I just want to be able to load an audio file and point out dominant frequencies in the spectrum and extract frequency values.

Something like this :

[ustk]

@Chazrox If it's not real time, then the FFT in the API list should do it. Otherwise it needs C++ and a global cable to send the data back to the interface

[Christoph Hart]

@ustk yup offline spectrum generation can be done with the inbuilt HISE tools:

Content.makeFrontInterface(600, 600);

// Create a buffer with a second length
const var b = Buffer.create(44100.0);

// fill it up with some random signal - two sine sweeps and some noise
reg uptime = 0.0;
reg delta = 0.01;

for(s in b)
{
	s = Math.sin(uptime);
	s += 0.5 * Math.sin(uptime * 2.0);
	s += 0.3 * Math.random();
	
	uptime += delta;
	delta += 0.00003;
}

// Create the FFT object that is used to create the spectrum
const var fft = Engine.createFFT();

// Enable the spectrum generation
fft.setEnableSpectrum2D(true);

// Setup the FFT processing (FFT size & channel count)
fft.prepare(1024, 1);

// Fetch the spectrum options
const var options = fft.getSpectrum2DParameters();

// Dump that
Console.print(trace(options));

// change whatever property you want.
options.ColourScheme = 2;
options.Oversampling = 8;
options.Gamma = 30;
options.ResamplingQuality = "High";

// Send it back
fft.setSpectrum2DParameters(options);

// process the buffer. This creates the spectrum
// that can then be painted
fft.process(b);

// create a panel
const var p = Content.addPanel("P1", 0, 0);

p.set("width", 600);
p.set("height", 600);

p.setPaintRoutine(function(g)
{
	// This function paints the FFT spectrum on the panel
	g.drawFFTSpectrum(fft, this.getLocalBounds(0));
});

[Chazrox]

@ustk for my purpose it wouldn't have to be real time. I'll look into it. Thanks!

[Chazrox]

@Christoph-Hart woah! I cant wait to try this! Thank You!