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Better square waveform

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This commit is contained in:
Alessandro Proto 2023-02-14 15:04:48 +01:00
parent e24192fb26
commit 8e08c80d91
1 changed files with 16 additions and 3 deletions
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19
Capy64/Core/Audio.cs
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@ -46,18 +46,31 @@ public class Audio : IDisposable
return buffer;
}
private static double GetSquarePoint(double frequency, double x)
{
double v = 0;
for (int n = 0; n <= 25; n++)
{
v += Math.Sin(Math.PI * (2 * n) * x * frequency)
/ (2 * n + 1)
/ 2 + 0.5;
}
return v;
}
public static byte[] GenerateSquareWave(double frequency, double time, double volume = 1d)
{
var amplitude = 128 * volume;
var timeStep = 1d / SampleRate;
frequency /= 2;
var buffer = new byte[(int)(SampleRate * time)];
var ctime = 0d;
for (int i = 0; i < buffer.Length; i++)
{
double angle = (Math.PI * frequency) * ctime;
double factor = Math.Sin(angle);
buffer[i] = (byte)(factor >= 0 ? amplitude : 0);
var v = GetSquarePoint(frequency, ctime);
buffer[i] = (byte)(v * amplitude);
ctime += timeStep;
}
return buffer;