/// <summary>
/// Method for generating chirp signal according to formula:
///
/// y[n] = A * cos(2 * pi * (f0 + k * n) / fs * n)
///
/// </summary>
/// <returns></returns>
protected override DiscreteSignal Generate()
{
Guard.AgainstNonPositive(_f0, "Start frequency");
Guard.AgainstNonPositive(_f1, "End frequency");
var k = (float)((_f1 - _f0) / Length);
var f = (float)_f0;
var amp = (float)_amplitude;
return(Modulate.FrequencyLinear(f, amp, k, Length, SamplingRate));
}
public Godot.Collections.Dictionary <string, object> Save()
{
return(new Godot.Collections.Dictionary <string, object>()
{
{ "Filename", Filename },
{ "Parent", GetParent().GetPath() },
{ "PositionX", Position.x },
{ "PositionY", Position.y },
{ "ModColor", Modulate.ToHtml(true) }
});
}
/// <summary>
/// Method implements simple tremolo effect
/// </summary>
/// <param name="signal"></param>
/// <param name="filteringOptions"></param>
/// <returns></returns>
public DiscreteSignal ApplyTo(DiscreteSignal signal,
FilteringOptions filteringOptions = FilteringOptions.Auto)
{
return(Modulate.Amplitude(signal, Frequency, TremoloIndex));
}
