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Do not square energy as we are not complex. Do not clamp gain

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This commit is contained in:
Geoffrey Merck 2020-02-03 15:34:08 +01:00
parent 66eab222c4
commit 3c06fb0ac1
1 changed files with 5 additions and 5 deletions
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10
ambed/cagc.cpp
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@ -42,7 +42,7 @@ CAGC::CAGC(float initialLeveldB)
m_GainMin = pow(10.0f, (initialLeveldB - 10.0f)/20.0f); m_GainMin = pow(10.0f, (initialLeveldB - 10.0f)/20.0f);
m_EnergyPrime = 1.0f; m_EnergyPrime = 1.0f;
m_targetEnergy = 32768.0f;//TODO : Move to parameter ? m_targetEnergy = 32767.0f;//TODO : Move to parameter ?
m_Bandwidth = 1e-2f;//TODO : Move to parameter ? m_Bandwidth = 1e-2f;//TODO : Move to parameter ?
m_Alpha = m_Bandwidth; m_Alpha = m_Bandwidth;
@ -70,8 +70,8 @@ void CAGC::Apply(uint8 * voice, int size)
// apply gain to input sample // apply gain to input sample
float output = input * m_Gain; float output = input * m_Gain;
// compute output signal energy // compute output signal energy, scaled to 0 to 1
float instantEnergy = (output * output) / m_targetEnergy; float instantEnergy = abs(output) / m_targetEnergy;
// smooth energy estimate using single-pole low-pass filter // smooth energy estimate using single-pole low-pass filter
m_EnergyPrime = (1.0f - m_Alpha) * m_EnergyPrime + m_Alpha * instantEnergy; m_EnergyPrime = (1.0f - m_Alpha) * m_EnergyPrime + m_Alpha * instantEnergy;
@ -81,10 +81,10 @@ void CAGC::Apply(uint8 * voice, int size)
m_Gain *= exp( -0.5f * m_Alpha * log(m_EnergyPrime) ); m_Gain *= exp( -0.5f * m_Alpha * log(m_EnergyPrime) );
// clamp gain // clamp gain
if (m_Gain > m_GainMax) /*if (m_Gain > m_GainMax)
m_Gain = m_GainMax; m_Gain = m_GainMax;
else if(m_Gain < m_GainMin) else if(m_Gain < m_GainMin)
m_Gain = m_GainMin; m_Gain = m_GainMin;*/
//write processed sample back //write processed sample back
voice[i] = HIBYTE((short)output); voice[i] = HIBYTE((short)output);