gri_agc2_ff.h
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00023 #ifndef _GRI_AGC2_FF_H_
00024 #define _GRI_AGC2_FF_H_
00025
00026 #include <math.h>
00027
00035 class gri_agc2_ff {
00036
00037 public:
00038 gri_agc2_ff (float attack_rate = 1e-1, float decay_rate = 1e-2, float reference = 1.0,
00039 float gain = 1.0, float max_gain = 0.0)
00040 : _attack_rate(attack_rate), _decay_rate(decay_rate), _reference(reference),
00041 _gain(gain), _max_gain(max_gain) {};
00042
00043 float attack_rate () const { return _attack_rate; }
00044 float decay_rate () const { return _decay_rate; }
00045 float reference () const { return _reference; }
00046 float gain () const { return _gain; }
00047 float max_gain () const { return _max_gain; }
00048
00049 void set_attack_rate (float rate) { _attack_rate = rate; }
00050 void set_decay_rate (float rate) { _decay_rate = rate; }
00051 void set_reference (float reference) { _reference = reference; }
00052 void set_gain (float gain) { _gain = gain; }
00053 void set_max_gain (float max_gain) { _max_gain = max_gain; }
00054
00055 float scale (float input){
00056 float output = input * _gain;
00057
00058 float tmp = (fabsf(output)) - _reference;
00059 float rate = _decay_rate;
00060 if(fabsf(tmp) > _gain)
00061 rate = _attack_rate;
00062 _gain -= tmp*rate;
00063
00064 #if 0
00065 fprintf(stdout, "rate = %f\ttmp = %f\t gain = %f\n", rate, tmp, _gain);
00066 #endif
00067
00068
00069 if (_gain < 0.0)
00070 _gain = 10e-5;
00071
00072 if (_max_gain > 0.0 && _gain > _max_gain)
00073 _gain = _max_gain;
00074 return output;
00075 }
00076
00077 void scaleN (float output[], const float input[], unsigned n){
00078 for (unsigned i = 0; i < n; i++)
00079 output[i] = scale (input[i]);
00080 }
00081
00082 protected:
00083 float _attack_rate;
00084 float _decay_rate;
00085 float _reference;
00086 float _gain;
00087 float _max_gain;
00088 };
00089
00090 #endif