mirror of https://github.com/LX3JL/xlxd.git
LX3JL
6 years ago
committed by
GitHub
commit
c8e28e77d6
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//
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// cagc.cpp
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// ambed
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//
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// Created by Jean-Luc Deltombe (LX3JL) on 28/04/2017.
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// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
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//
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// ----------------------------------------------------------------------------
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// This file is part of ambed.
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//
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// xlxd is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// xlxd is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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// ----------------------------------------------------------------------------
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// Geoffrey Merck F4FXL / KC3FRA AGC code borrowed from Liquid DSP
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// Only took the parts we need qnd recoeded it to be close the XLX coding style
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// https://github.com/jgaeddert/liquid-dsp/blob/master/src/agc/src/agc.c
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#include <math.h>
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#include "cagc.h"
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#include "main.h"
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////////////////////////////////////////////////////////////////////////////////////////
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// constructor
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CAGC::CAGC(float initialLeveldB)
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{
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// set internal gain appropriately
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m_Gain = pow(10.0f, initialLeveldB/20.0f);
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//+- 10dB Margin, TODO Move margin to constant
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m_GainMax = pow(10.0f, (initialLeveldB + AGC_CLAMPING)/20.0f);
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m_GainMin = pow(10.0f, (initialLeveldB - AGC_CLAMPING)/20.0f);
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m_EnergyPrime = 1.0f;
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// We do not target full scale to avoid stauration
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m_targetEnergy = 32767.0f * pow(10.0f, (initialLeveldB - 25.0)/20.0f);//25 dB below saturation as stated in docs
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//we also substract our target gain
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//this is the time constant of our AGC...
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m_Bandwidth = 1e-2f;//TODO : Move to parameter ?
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m_Alpha = m_Bandwidth;
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}
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////////////////////////////////////////////////////////////////////////////////////////
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// get
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float CAGC::GetGain()
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{
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return 20.0f*log10(m_Gain);
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}
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////////////////////////////////////////////////////////////////////////////////////////
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// process
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inline void CAGC::ProcessSampleBlock(uint8* voice, int length)
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{
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for(int i = 0; i < length; i += 2)
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{
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float input = (float)(short)MAKEWORD(voice[i+1], voice[i]);
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//apply AGC
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// apply gain to input sample
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float output = input * m_Gain;
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// compute output signal energy, scaled to 0 to 1
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float instantEnergy = abs(output) / m_targetEnergy;
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// smooth energy estimate using single-pole low-pass filter
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m_EnergyPrime = (1.0f - m_Alpha) * m_EnergyPrime + m_Alpha * instantEnergy;
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// update gain according to output energy
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if (m_EnergyPrime > 1e-6f)
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m_Gain *= exp( -0.5f * m_Alpha * log(m_EnergyPrime) );
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// clamp gain
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if (m_Gain > m_GainMax)
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m_Gain = m_GainMax;
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else if(m_Gain < m_GainMin)
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m_Gain = m_GainMin;
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//write processed sample back
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voice[i] = HIBYTE((short)output);
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voice[i+1] = LOBYTE((short)output);
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}
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}
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//
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// cagc.h
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// ambed
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//
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// Created by Jean-Luc Deltombe (LX3JL) on 26/04/2017.
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// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
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//
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// ----------------------------------------------------------------------------
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// This file is part of ambed.
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//
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||||||
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// xlxd is free software: you can redistribute it and/or modify
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||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
||||||
|
// (at your option) any later version.
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||||||
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//
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||||||
|
// xlxd is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
|
||||||
|
//
|
||||||
|
// You should have received a copy of the GNU General Public License
|
||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
// ----------------------------------------------------------------------------
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||||||
|
// Geoffrey Merck F4FXL / KC3FRA AGC code largely inspired by Liquid DSP
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||||||
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// Only took the parts we need qnd recoeded it to be close the XLX coding style
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// https://github.com/jgaeddert/liquid-dsp/blob/master/src/agc/src/agc.c
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#ifndef cagc_h
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#define cagc_h
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#include "csampleblockprocessor.h"
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class CAGC : CSampleBlockProcessor
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{
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public:
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//Constructor
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CAGC(float initialLeveldB);
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//methods
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void ProcessSampleBlock(uint8* voice, int length) ;
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float GetGain();//gets current gain
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private:
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float m_Gain; // current gain value
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float m_GainMax, m_GainMin; //gain clamping
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float m_targetEnergy; // scale value for target energy
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// gain control loop filter parameters
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float m_Bandwidth; // bandwidth-time constant
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float m_Alpha; // feed-back gain
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// signal level estimate
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float m_EnergyPrime; // filtered output signal energy estimate
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};
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#endif /* cgc_h */
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//
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// cfirfilter.cpp
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// ambed
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//
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// Created by Jean-Luc Deltombe (LX3JL) on 26/04/2017.
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// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
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|
//
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// ----------------------------------------------------------------------------
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// This file is part of ambed.
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||||||
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//
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||||||
|
// xlxd is free software: you can redistribute it and/or modify
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||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
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|
// (at your option) any later version.
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||||||
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//
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||||||
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// xlxd is distributed in the hope that it will be useful,
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||||||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
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||||||
|
//
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// You should have received a copy of the GNU General Public License
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||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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// ----------------------------------------------------------------------------
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// FIRFilter by Geoffrey Merck F4FXL / KC3FRA
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#include "cfirfilter.h"
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#include <string.h>
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CFIRFilter::CFIRFilter(const float* taps, int tapsLength)
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{
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m_taps = new float[tapsLength];
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m_buffer = new float[tapsLength];
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m_tapsLength = tapsLength;
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::memcpy(m_taps, taps, tapsLength * sizeof(float));
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::memset(m_buffer, 0, tapsLength * sizeof(float));
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m_currentBufferPosition = 0;
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}
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CFIRFilter::~CFIRFilter()
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{
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delete[] m_taps;
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delete[] m_buffer;
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}
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inline void CFIRFilter::ProcessSampleBlock(uint8* voice, int length)
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{
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for(int i = 0; i < length; i += 2)
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{
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float input = (float)(short)MAKEWORD(voice[i+1], voice[i]);
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float output = 0.0f;
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int iTaps = 0;
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// Buffer latest sample into delay line
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m_buffer[m_currentBufferPosition] = input;
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for(int i = m_currentBufferPosition; i >= 0; i--)
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{
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output += m_taps[iTaps++] * m_buffer[i];
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}
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for(int i = m_tapsLength - 1; i > m_currentBufferPosition; i--)
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{
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output += m_taps[iTaps++] * m_buffer[i];
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}
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m_currentBufferPosition = (m_currentBufferPosition + 1) % m_tapsLength;
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//write processed sample back
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voice[i] = HIBYTE((short)output);
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voice[i+1] = LOBYTE((short)output);
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}
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}
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//
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// cfirfilter.h
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// ambed
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//
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// Created by Jean-Luc Deltombe (LX3JL) on 26/04/2017.
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// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
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//
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// ----------------------------------------------------------------------------
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||||||
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// This file is part of ambed.
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||||||
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//
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||||||
|
// xlxd is free software: you can redistribute it and/or modify
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||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
||||||
|
// (at your option) any later version.
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||||||
|
//
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||||||
|
// xlxd is distributed in the hope that it will be useful,
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||||||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
|
||||||
|
//
|
||||||
|
// You should have received a copy of the GNU General Public License
|
||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
||||||
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// ----------------------------------------------------------------------------
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// FIRFilter by Geoffrey Merck F4FXL / KC3FRA
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#ifndef cfirfilter_h
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#define cfirfilter_h
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#include "csampleblockprocessor.h"
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class CFIRFilter : CSampleBlockProcessor
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{
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public :
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//Constructor
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CFIRFilter(const float* taps, int tapsLength);
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// Destructor
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~CFIRFilter();
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// Processing
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void ProcessSampleBlock(uint8* voice, int length);
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private:
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float* m_taps;
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int m_tapsLength;
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float* m_buffer;
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int m_currentBufferPosition;
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};
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#endif //cfirfilter_h
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@ -0,0 +1,53 @@
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//
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// cfixedgain.cpp
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// ambed
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//
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||||||
|
// Created by Jean-Luc Deltombe (LX3JL) on 28/04/2017.
|
||||||
|
// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
|
||||||
|
//
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// This file is part of ambed.
|
||||||
|
//
|
||||||
|
// xlxd is free software: you can redistribute it and/or modify
|
||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
||||||
|
// (at your option) any later version.
|
||||||
|
//
|
||||||
|
// xlxd is distributed in the hope that it will be useful,
|
||||||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
|
||||||
|
//
|
||||||
|
// You should have received a copy of the GNU General Public License
|
||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// Geoffrey Merck F4FXL / KC3FRA AGC
|
||||||
|
|
||||||
|
#include "cfixedgain.h"
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|
#include <math.h>
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||||||
|
|
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|
////////////////////////////////////////////////////////////////////////////////////////
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// constructor
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CFixedGain::CFixedGain(float gaindB)
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|
{
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m_gaindB = gaindB;
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|
m_gainLinear = pow(10.0f, m_gaindB/20.0f);
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|
}
|
||||||
|
|
||||||
|
////////////////////////////////////////////////////////////////////////////////////////
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||||||
|
// processing
|
||||||
|
|
||||||
|
inline void CFixedGain::ProcessSampleBlock(uint8* voice, int length)
|
||||||
|
{
|
||||||
|
for(int i = 0; i < length; i += 2)
|
||||||
|
{
|
||||||
|
float input = (float)(short)MAKEWORD(voice[i+1], voice[i]);
|
||||||
|
//apply gain
|
||||||
|
float output = input * m_gainLinear;
|
||||||
|
|
||||||
|
//write processed sample back
|
||||||
|
voice[i] = HIBYTE((short)output);
|
||||||
|
voice[i+1] = LOBYTE((short)output);
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,45 @@
|
|||||||
|
//
|
||||||
|
// cfixedgain.h
|
||||||
|
// ambed
|
||||||
|
//
|
||||||
|
// Created by Jean-Luc Deltombe (LX3JL) on 26/04/2017.
|
||||||
|
// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
|
||||||
|
//
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// This file is part of ambed.
|
||||||
|
//
|
||||||
|
// xlxd is free software: you can redistribute it and/or modify
|
||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
||||||
|
// (at your option) any later version.
|
||||||
|
//
|
||||||
|
// xlxd is distributed in the hope that it will be useful,
|
||||||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
|
||||||
|
//
|
||||||
|
// You should have received a copy of the GNU General Public License
|
||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// Geoffrey Merck F4FXL / KC3FRA
|
||||||
|
|
||||||
|
#ifndef cfixedgain_h
|
||||||
|
#define cfixedgain_h
|
||||||
|
|
||||||
|
#include "csampleblockprocessor.h"
|
||||||
|
|
||||||
|
class CFixedGain : CSampleBlockProcessor
|
||||||
|
{
|
||||||
|
public:
|
||||||
|
//Constructor
|
||||||
|
CFixedGain(float gaindB);
|
||||||
|
|
||||||
|
//processing
|
||||||
|
void ProcessSampleBlock(uint8* voice, int length);
|
||||||
|
|
||||||
|
private:
|
||||||
|
float m_gaindB; //gain in dB
|
||||||
|
float m_gainLinear; //linearized gain
|
||||||
|
};
|
||||||
|
|
||||||
|
#endif /* cfixedgain_h */
|
||||||
@ -0,0 +1,38 @@
|
|||||||
|
//
|
||||||
|
// csampleprocessor.h
|
||||||
|
// ambed
|
||||||
|
//
|
||||||
|
// Created by Jean-Luc Deltombe (LX3JL) on 26/04/2017.
|
||||||
|
// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
|
||||||
|
//
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// This file is part of ambed.
|
||||||
|
//
|
||||||
|
// xlxd is free software: you can redistribute it and/or modify
|
||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
||||||
|
// (at your option) any later version.
|
||||||
|
//
|
||||||
|
// xlxd is distributed in the hope that it will be useful,
|
||||||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
|
||||||
|
//
|
||||||
|
// You should have received a copy of the GNU General Public License
|
||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// Geoffrey Merck F4FXL / KC3FRA
|
||||||
|
|
||||||
|
#ifndef csamplebloclprocessor_h
|
||||||
|
#define csamplebloclprocessor_h
|
||||||
|
|
||||||
|
#include "main.h"
|
||||||
|
|
||||||
|
class CSampleBlockProcessor
|
||||||
|
{
|
||||||
|
public:
|
||||||
|
//processing
|
||||||
|
virtual void ProcessSampleBlock(uint8* voice, int length) = 0;
|
||||||
|
};
|
||||||
|
|
||||||
|
#endif /* csampleprocessor_h */
|
||||||
@ -0,0 +1,94 @@
|
|||||||
|
//
|
||||||
|
// cagc.cpp
|
||||||
|
// ambed
|
||||||
|
//
|
||||||
|
// Created by Jean-Luc Deltombe (LX3JL) on 28/04/2017.
|
||||||
|
// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
|
||||||
|
//
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// This file is part of ambed.
|
||||||
|
//
|
||||||
|
// xlxd is free software: you can redistribute it and/or modify
|
||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
||||||
|
// (at your option) any later version.
|
||||||
|
//
|
||||||
|
// xlxd is distributed in the hope that it will be useful,
|
||||||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
|
||||||
|
//
|
||||||
|
// You should have received a copy of the GNU General Public License
|
||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// Geoffrey Merck F4FXL / KC3FRA AGC
|
||||||
|
|
||||||
|
#include "main.h"
|
||||||
|
#include "csignalprocessor.h"
|
||||||
|
|
||||||
|
#if USE_AGC == 1
|
||||||
|
#include "cagc.h"
|
||||||
|
#else
|
||||||
|
#include "cfixedgain.h"
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if USE_BANDPASSFILTER == 1
|
||||||
|
#include "cfirfilter.h"
|
||||||
|
#endif
|
||||||
|
|
||||||
|
////////////////////////////////////////////////////////////////////////////////////////
|
||||||
|
// constructor
|
||||||
|
|
||||||
|
CSignalProcessor::CSignalProcessor(float gaindB)
|
||||||
|
{
|
||||||
|
#if USE_BANDPASSFILTER
|
||||||
|
m_sampleProcessors.push_back((CSampleBlockProcessor*)new CFIRFilter(FILTER_TAPS, FILTER_TAPS_LENGTH));
|
||||||
|
#endif
|
||||||
|
#if USE_AGC == 1
|
||||||
|
m_sampleProcessors.push_back((CSampleBlockProcessor*)new CAGC(gaindB));
|
||||||
|
#else
|
||||||
|
m_sampleProcessors.push_back((CSampleBlockProcessor*)new CFixedGain(gaindB));
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
////////////////////////////////////////////////////////////////////////////////////////
|
||||||
|
// destructor
|
||||||
|
|
||||||
|
CSignalProcessor::~CSignalProcessor()
|
||||||
|
{
|
||||||
|
for(int i = 0; i < m_sampleProcessors.size(); i++)
|
||||||
|
{
|
||||||
|
delete m_sampleProcessors[i];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
////////////////////////////////////////////////////////////////////////////////////////
|
||||||
|
// processing
|
||||||
|
|
||||||
|
void CSignalProcessor::Process(uint8* voice, int length)
|
||||||
|
{
|
||||||
|
/*float sample;
|
||||||
|
int j;*/
|
||||||
|
auto processorsSize = m_sampleProcessors.size();
|
||||||
|
|
||||||
|
for(int j = 0; j < processorsSize; j++)
|
||||||
|
{
|
||||||
|
m_sampleProcessors[j]->ProcessSampleBlock(voice, length);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*for(int i = 0; i < length; i += 2)
|
||||||
|
{
|
||||||
|
//Get the sample
|
||||||
|
sample = (float)(short)MAKEWORD(voice[i+1], voice[i]);
|
||||||
|
|
||||||
|
for(j = 0; j < processorsSize; j++)
|
||||||
|
{
|
||||||
|
sample = m_sampleProcessors[j]->ProcessSample(sample);
|
||||||
|
}
|
||||||
|
|
||||||
|
//write processed sample back
|
||||||
|
voice[i] = HIBYTE((short)sample);
|
||||||
|
voice[i+1] = LOBYTE((short)sample);
|
||||||
|
}*/
|
||||||
|
}
|
||||||
@ -0,0 +1,48 @@
|
|||||||
|
//
|
||||||
|
// csignalprocessor.h
|
||||||
|
// ambed
|
||||||
|
//
|
||||||
|
// Created by Jean-Luc Deltombe (LX3JL) on 26/04/2017.
|
||||||
|
// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
|
||||||
|
//
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// This file is part of ambed.
|
||||||
|
//
|
||||||
|
// xlxd is free software: you can redistribute it and/or modify
|
||||||
|
// it under the terms of the GNU General Public License as published by
|
||||||
|
// the Free Software Foundation, either version 3 of the License, or
|
||||||
|
// (at your option) any later version.
|
||||||
|
//
|
||||||
|
// xlxd is distributed in the hope that it will be useful,
|
||||||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
// GNU General Public License for more details.
|
||||||
|
//
|
||||||
|
// You should have received a copy of the GNU General Public License
|
||||||
|
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
// ----------------------------------------------------------------------------
|
||||||
|
// Geoffrey Merck F4FXL / KC3FRA
|
||||||
|
|
||||||
|
#ifndef csignalprocessor_h
|
||||||
|
#define csignalprocessor_h
|
||||||
|
|
||||||
|
#include <vector>
|
||||||
|
#include "csampleblockprocessor.h"
|
||||||
|
|
||||||
|
class CSignalProcessor
|
||||||
|
{
|
||||||
|
public:
|
||||||
|
//Constructor
|
||||||
|
CSignalProcessor(float gaindB);
|
||||||
|
|
||||||
|
//Destructor
|
||||||
|
~CSignalProcessor();
|
||||||
|
|
||||||
|
//Processing
|
||||||
|
void Process(uint8* voice, int length);
|
||||||
|
|
||||||
|
private:
|
||||||
|
std::vector<CSampleBlockProcessor *> m_sampleProcessors;
|
||||||
|
};
|
||||||
|
|
||||||
|
#endif /* csignalprocessor_h */
|
||||||
Loading…
Reference in new issue