mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-23 00:18:37 -05:00
247 lines
10 KiB
C++
247 lines
10 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019 F4EXB //
|
|
// written by Edouard Griffiths //
|
|
// //
|
|
// This program 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 as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program 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 V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <QDebug>
|
|
|
|
#include "devicesamplestatic.h"
|
|
|
|
int64_t DeviceSampleStatic::calculateSourceDeviceCenterFrequency(
|
|
uint64_t centerFrequency,
|
|
int64_t transverterDeltaFrequency,
|
|
int log2Decim,
|
|
fcPos_t fcPos,
|
|
uint32_t devSampleRate,
|
|
FrequencyShiftScheme frequencyShiftScheme,
|
|
bool transverterMode)
|
|
{
|
|
int64_t deviceCenterFrequency = centerFrequency;
|
|
deviceCenterFrequency -= transverterMode ? transverterDeltaFrequency : 0;
|
|
deviceCenterFrequency = deviceCenterFrequency < 0 ? 0 : deviceCenterFrequency;
|
|
int64_t f_img = deviceCenterFrequency;
|
|
|
|
deviceCenterFrequency -= calculateSourceFrequencyShift(log2Decim, fcPos, devSampleRate, frequencyShiftScheme);
|
|
f_img -= 2*calculateSourceFrequencyShift(log2Decim, fcPos, devSampleRate, frequencyShiftScheme);
|
|
|
|
qDebug() << "DeviceSampleStatic::calculateSourceDeviceCenterFrequency:"
|
|
<< " frequencyShiftScheme: " << frequencyShiftScheme
|
|
<< " desired center freq: " << centerFrequency << " Hz"
|
|
<< " device center freq: " << deviceCenterFrequency << " Hz"
|
|
<< " device sample rate: " << devSampleRate << "S/s"
|
|
<< " Actual sample rate: " << devSampleRate/(1<<log2Decim) << "S/s"
|
|
<< " center freq position code: " << fcPos
|
|
<< " image frequency: " << f_img << "Hz";
|
|
|
|
return deviceCenterFrequency;
|
|
}
|
|
|
|
int64_t DeviceSampleStatic::calculateSourceCenterFrequency(
|
|
uint64_t deviceCenterFrequency,
|
|
int64_t transverterDeltaFrequency,
|
|
int log2Decim,
|
|
fcPos_t fcPos,
|
|
uint32_t devSampleRate,
|
|
FrequencyShiftScheme frequencyShiftScheme,
|
|
bool transverterMode)
|
|
{
|
|
qint64 centerFrequency = deviceCenterFrequency;
|
|
centerFrequency += calculateSourceFrequencyShift(log2Decim, fcPos, devSampleRate, frequencyShiftScheme);
|
|
centerFrequency += transverterMode ? transverterDeltaFrequency : 0;
|
|
centerFrequency = centerFrequency < 0 ? 0 : centerFrequency;
|
|
|
|
qDebug() << "DeviceSampleStatic::calculateSourceCenterFrequency:"
|
|
<< " frequencyShiftScheme: " << frequencyShiftScheme
|
|
<< " desired center freq: " << centerFrequency << " Hz"
|
|
<< " device center freq: " << deviceCenterFrequency << " Hz"
|
|
<< " device sample rate: " << devSampleRate << "S/s"
|
|
<< " Actual sample rate: " << devSampleRate/(1<<log2Decim) << "S/s"
|
|
<< " center freq position code: " << fcPos;
|
|
|
|
return centerFrequency;
|
|
}
|
|
|
|
/**
|
|
* log2Decim = 0: no shift
|
|
*
|
|
* n = log2Decim <= 2: fc = +/- 1/2^(n-1)
|
|
* center
|
|
* | ^ |
|
|
* | inf | sup |
|
|
* ^ ^
|
|
*
|
|
* n = log2Decim > 2: fc = +/- 1/2^n
|
|
* center
|
|
* | ^ |
|
|
* | |inf| | |sup| |
|
|
* ^ ^
|
|
*/
|
|
int DeviceSampleStatic::calculateSourceFrequencyShift(
|
|
int log2Decim,
|
|
fcPos_t fcPos,
|
|
uint32_t devSampleRate,
|
|
FrequencyShiftScheme frequencyShiftScheme)
|
|
{
|
|
if (frequencyShiftScheme == FSHIFT_STD)
|
|
{
|
|
if (log2Decim == 0) { // no shift at all
|
|
return 0;
|
|
} else if (log2Decim < 3) {
|
|
if (fcPos == FC_POS_INFRA) { // shift in the square next to center frequency
|
|
return -(devSampleRate / (1<<(log2Decim+1)));
|
|
} else if (fcPos == FC_POS_SUPRA) {
|
|
return devSampleRate / (1<<(log2Decim+1));
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (fcPos == FC_POS_INFRA) { // shift centered in the square next to center frequency
|
|
return -(devSampleRate / (1<<(log2Decim)));
|
|
} else if (fcPos == FC_POS_SUPRA) {
|
|
return devSampleRate / (1<<(log2Decim));
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
else // frequencyShiftScheme == FSHIFT_TXSYNC
|
|
{
|
|
if (fcPos == FC_POS_CENTER) {
|
|
return 0;
|
|
}
|
|
|
|
int sign = fcPos == FC_POS_INFRA ? -1 : 1;
|
|
int halfSampleRate = devSampleRate / 2; // fractions are relative to sideband thus based on half the sample rate
|
|
|
|
if (log2Decim == 0) {
|
|
return 0;
|
|
} else if (log2Decim == 1) {
|
|
return sign * (halfSampleRate / 2); // inf or sup: 1/2
|
|
} else if (log2Decim == 2) {
|
|
return sign * ((halfSampleRate * 3) / 4); // inf, inf or sup, sup: 1/2 + 1/4
|
|
} else if (log2Decim == 3) {
|
|
return sign * ((halfSampleRate * 5) / 8); // inf, inf, sup or sup, sup, inf: 1/2 + 1/4 - 1/8 = 5/8
|
|
} else if (log2Decim == 4) {
|
|
return sign * ((halfSampleRate * 11) / 16); // inf, inf, sup, inf or sup, sup, inf, sup: 1/2 + 1/4 - 1/8 + 1/16 = 11/16
|
|
} else if (log2Decim == 5) {
|
|
return sign * ((halfSampleRate * 21) / 32); // inf, inf, sup, inf, sup or sup, sup, inf, sup, inf: 1/2 + 1/4 - 1/8 + 1/16 - 1/32 = 21/32
|
|
} else if (log2Decim == 6) {
|
|
return sign * ((halfSampleRate * 21) / 64); // inf, sup, inf, sup, inf, sup or sup, inf, sup, inf, sup, inf: 1/2 - 1/4 + 1/8 -1/16 + 1/32 - 1/64 = 21/64
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
int64_t DeviceSampleStatic::calculateSinkDeviceCenterFrequency(
|
|
uint64_t centerFrequency,
|
|
int64_t transverterDeltaFrequency,
|
|
int log2Interp,
|
|
fcPos_t fcPos,
|
|
uint32_t devSampleRate,
|
|
bool transverterMode)
|
|
{
|
|
int64_t deviceCenterFrequency = centerFrequency;
|
|
deviceCenterFrequency -= transverterMode ? transverterDeltaFrequency : 0;
|
|
deviceCenterFrequency = deviceCenterFrequency < 0 ? 0 : deviceCenterFrequency;
|
|
int64_t f_img = deviceCenterFrequency;
|
|
|
|
deviceCenterFrequency -= calculateSinkFrequencyShift(log2Interp, fcPos, devSampleRate);
|
|
f_img -= 2*calculateSinkFrequencyShift(log2Interp, fcPos, devSampleRate);
|
|
|
|
qDebug() << "DeviceSampleStatic::calculateSinkDeviceCenterFrequency:"
|
|
<< " desired center freq: " << centerFrequency << " Hz"
|
|
<< " device center freq: " << deviceCenterFrequency << " Hz"
|
|
<< " device sample rate: " << devSampleRate << "S/s"
|
|
<< " Actual sample rate: " << devSampleRate/(1<<log2Interp) << "S/s"
|
|
<< " center freq position code: " << fcPos
|
|
<< " image frequency: " << f_img << "Hz";
|
|
|
|
return deviceCenterFrequency;
|
|
}
|
|
|
|
int64_t DeviceSampleStatic::calculateSinkCenterFrequency(
|
|
uint64_t deviceCenterFrequency,
|
|
int64_t transverterDeltaFrequency,
|
|
int log2Interp,
|
|
fcPos_t fcPos,
|
|
uint32_t devSampleRate,
|
|
bool transverterMode)
|
|
{
|
|
int64_t centerFrequency = deviceCenterFrequency;
|
|
centerFrequency += calculateSinkFrequencyShift(log2Interp, fcPos, devSampleRate);
|
|
centerFrequency += transverterMode ? transverterDeltaFrequency : 0;
|
|
centerFrequency = centerFrequency < 0 ? 0 : centerFrequency;
|
|
|
|
qDebug() << "DeviceSampleStatic::calculateSinkCenterFrequency:"
|
|
<< " desired center freq: " << centerFrequency << " Hz"
|
|
<< " device center freq: " << deviceCenterFrequency << " Hz"
|
|
<< " device sample rate: " << devSampleRate << "S/s"
|
|
<< " Actual sample rate: " << devSampleRate/(1<<log2Interp) << "S/s"
|
|
<< " center freq position code: " << fcPos;
|
|
|
|
return centerFrequency;
|
|
}
|
|
|
|
/**
|
|
* log2Interp = 0: no shift
|
|
*
|
|
* log2Interp = 1: middle of side band (inf or sup: 1/2)
|
|
* ^ | ^
|
|
* | inf | inf | sup | sup |
|
|
*
|
|
* log2Interp = 2: middle of far side half side band (inf, inf or sup, sup: 1/2 + 1/4)
|
|
* ^ | ^
|
|
* | inf | inf | sup | sup |
|
|
*
|
|
* log2Interp = 3: inf, inf, sup or sup, sup, inf: 1/2 + 1/4 - 1/8 = 5/8
|
|
* log2Interp = 4: inf, inf, sup, inf or sup, sup, inf, sup: 1/2 + 1/4 - 1/8 + 1/16 = 11/16
|
|
* log2Interp = 5: inf, inf, sup, inf, sup or sup, sup, inf, sup, inf: 1/2 + 1/4 - 1/8 + 1/16 - 1/32 = 21/32
|
|
* log2Interp = 6: inf, sup, inf, sup, inf, sup or sup, inf, sup, inf, sup, inf: 1/2 - 1/4 + 1/8 -1/16 + 1/32 - 1/64 = 21/64
|
|
*
|
|
*/
|
|
int DeviceSampleStatic::calculateSinkFrequencyShift(
|
|
int log2Interp,
|
|
fcPos_t fcPos,
|
|
uint32_t devSampleRate)
|
|
{
|
|
if (fcPos == FC_POS_CENTER) {
|
|
return 0;
|
|
}
|
|
|
|
int sign = fcPos == FC_POS_INFRA ? -1 : 1;
|
|
int halfSampleRate = devSampleRate / 2; // fractions are relative to sideband thus based on half the sample rate
|
|
|
|
if (log2Interp == 0) {
|
|
return 0;
|
|
} else if (log2Interp == 1) {
|
|
return sign * (halfSampleRate / 2);
|
|
} else if (log2Interp == 2) {
|
|
return sign * ((halfSampleRate * 3) / 4);
|
|
} else if (log2Interp == 3) {
|
|
return sign * ((halfSampleRate * 5) / 8);
|
|
} else if (log2Interp == 4) {
|
|
return sign * ((halfSampleRate * 11) / 16);
|
|
} else if (log2Interp == 5) {
|
|
return sign * ((halfSampleRate * 21) / 32);
|
|
} else if (log2Interp == 6) {
|
|
return sign * ((halfSampleRate * 21) / 64);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|