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