/// <summary>
/// Method for detecting the envelope of a signal
/// </summary>
/// <param name="signal">Signal</param>
/// <param name="lowpassCutoff">LP filter cutoff frequency</param>
/// <returns></returns>
public static DiscreteSignal Envelope(DiscreteSignal signal, float lowpassCutoff = 0.05f)
{
var envelope = FullRectify(signal);
var lowpassFilter = new LowPassFilter(lowpassCutoff);
var smoothed = lowpassFilter.ApplyTo(envelope);
return(smoothed);
}
private DiscreteSignal ProcessDistortion(DiscreteSignal signal, int gain, int distortion)
{
var input = signal.Samples;
var output = new float[input.Length];
for (var i = 0; i < signal.Length; i++)
{
// Process gain
output[i] = Gain(input[i], gain);
// Process distortion
output[i] = Dist(output[i], distortion);
}
// Process lowpass filter
var freq = 10000.0 /* Hz */ / signal.SamplingRate;
LowPassFilter lpf = new LowPassFilter(freq);
DiscreteSignal processed = new DiscreteSignal(signal.SamplingRate, output);
DiscreteSignal res = lpf.ApplyTo(processed);
return(res);
}
