[music-dsp] My first IIR - The vocoder works

[Bram de Jong]

Hiya.



Someone needed an env-detector...

...

env detector with attack & release:



class CEnvFolower  
{
public:
	inline float GetVal(float in);
	void SetParams(float attack, float release);
	CEnvFolower();
	virtual ~CEnvFolower();
private:
	float ga,gr,tmp;
};

inline float CEnvFolower::GetVal(float in)
{
	float a = in<0.f ? -in : in;
	//or float a = in*in;

	if(tmp < a)
		tmp = ga*(tmp-a) + a;
	else
		tmp = gr*(tmp-a) + a;

	return tmp;
}

//attack & release in millisecs
void CEnvFolower::SetParams(float attack, float release)
{
	ga = (float) exp(-1/(SampleRateF*attack/1000));
	gr = (float) exp(-1/(SampleRateF*release/1000));
	
	tmp=0;
}


Oh, and by the way, everyone: PLEASE edit your mails before replying!
Edit out the parts that are no longer needed!!!!




cheers,


B.


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