/// <summary>
/// Processes one sample.
/// </summary>
/// <param name="sample">Input sample</param>
public float Process(float sample)
{
var abs = Math.Abs(sample);
var xg = abs > 1e-6f ? (float)Scale.ToDecibel(abs) : _minAmplitudeDb;
var yg = 0f;
switch (_mode)
{
case DynamicsMode.Limiter:
case DynamicsMode.Compressor:
{
yg = xg < Threshold ? xg : Threshold + (xg - Threshold) / Ratio;
break;
}
case DynamicsMode.Expander:
case DynamicsMode.NoiseGate:
{
yg = xg > Threshold ? xg : Threshold + (xg - Threshold) * Ratio;
break;
}
}
var envelope = _envelopeFollower.Process(yg - xg);
var gain = (float)Scale.FromDecibel(MakeupGain - envelope);
return(sample * gain);
}
/// <summary>
/// Method for extracting the envelope of a signal
/// </summary>
/// <param name="signal">Signal</param>
/// <param name="attackTime"></param>
/// <param name="releaseTime"></param>
/// <returns></returns>
public static DiscreteSignal Envelope(DiscreteSignal signal, float attackTime = 0.01f, float releaseTime = 0.05f)
{
var envelopeFollower = new EnvelopeFollower(signal.SamplingRate, attackTime, releaseTime);
return(new DiscreteSignal(signal.SamplingRate, signal.Samples.Select(s => envelopeFollower.Process(s))));
}
