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synced 2025-04-04 02:28:33 -04:00
Added a complex sample center half band decimator
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f4exb
parent
3530de3464
commit
9bcceb8877
@ -86,6 +86,7 @@ set(sdrbase_SOURCES
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dsp/decimatorsif.cpp
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dsp/decimatorsff.cpp
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dsp/decimatorsfi.cpp
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dsp/decimatorc.cpp
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dsp/dspcommands.cpp
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dsp/dspengine.cpp
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dsp/dspdevicesourceengine.cpp
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@ -211,6 +212,7 @@ set(sdrbase_HEADERS
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dsp/decimatorsff.h
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dsp/decimatorsfi.h
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dsp/decimatorsu.h
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dsp/decimatorc.h
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dsp/interpolators.h
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dsp/interpolatorsif.h
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dsp/dspcommands.h
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221
sdrbase/dsp/decimatorc.cpp
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221
sdrbase/dsp/decimatorc.cpp
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@ -0,0 +1,221 @@
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2020 Edouard Griffiths, F4EXB //
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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 "decimatorc.h"
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DecimatorC::DecimatorC() :
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m_log2Decim(0),
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m_decim(1)
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{}
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void DecimatorC::setLog2Decim(unsigned int log2Decim)
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{
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m_log2Decim = log2Decim;
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m_decim = 1 << log2Decim;
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}
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bool DecimatorC::decimate(Complex c, Complex& cd)
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{
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if (m_log2Decim == 0) { // no decimation hence no translation possible
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return true;
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}
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if (m_log2Decim == 1) {
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return decimate2(c, cd);
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} else if (m_log2Decim == 2) {
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return decimate4(c, cd);
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} else if (m_log2Decim == 3) {
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return decimate8(c, cd);
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} else if (m_log2Decim == 4) {
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return decimate16(c, cd);
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} else if (m_log2Decim == 5) {
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return decimate32(c, cd);
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} else if (m_log2Decim == 6) {
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return decimate64(c, cd);
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}
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}
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bool DecimatorC::decimate2(Complex c, Complex& cd)
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{
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float x = c.real();
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float y = c.imag();
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bool done2 = m_decimator2.workDecimateCenter(&x, &y);
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if (done2)
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{
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cd.real(x);
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cd.imag(y);
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}
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return done2;
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}
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bool DecimatorC::decimate4(Complex c, Complex& cd)
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{
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float x = c.real();
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float y = c.imag();
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bool done2 = m_decimator2.workDecimateCenter(&x, &y);
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if (done2)
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{
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bool done4 = m_decimator4.workDecimateCenter(&x, &y);
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if (done4)
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{
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cd.real(x);
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cd.imag(y);
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return true;
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}
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}
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return false;
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}
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bool DecimatorC::decimate8(Complex c, Complex& cd)
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{
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float x = c.real();
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float y = c.imag();
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bool done2 = m_decimator2.workDecimateCenter(&x, &y);
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if (done2)
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{
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bool done4 = m_decimator4.workDecimateCenter(&x, &y);
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if (done4)
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{
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bool done8 = m_decimator8.workDecimateCenter(&x, &y);
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if (done8)
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{
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cd.real(x);
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cd.imag(y);
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return true;
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}
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}
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}
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return false;
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}
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bool DecimatorC::decimate16(Complex c, Complex& cd)
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{
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float x = c.real();
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float y = c.imag();
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bool done2 = m_decimator2.workDecimateCenter(&x, &y);
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if (done2)
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{
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bool done4 = m_decimator4.workDecimateCenter(&x, &y);
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if (done4)
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{
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bool done8 = m_decimator8.workDecimateCenter(&x, &y);
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if (done8)
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{
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bool done16 = m_decimator16.workDecimateCenter(&x, &y);
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if (done16)
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{
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cd.real(x);
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cd.imag(y);
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return true;
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}
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}
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}
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}
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return false;
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}
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bool DecimatorC::decimate32(Complex c, Complex& cd)
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{
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float x = c.real();
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float y = c.imag();
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bool done2 = m_decimator2.workDecimateCenter(&x, &y);
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if (done2)
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{
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bool done4 = m_decimator4.workDecimateCenter(&x, &y);
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if (done4)
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{
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bool done8 = m_decimator8.workDecimateCenter(&x, &y);
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if (done8)
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{
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bool done16 = m_decimator16.workDecimateCenter(&x, &y);
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if (done16)
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{
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bool done32 = m_decimator32.workDecimateCenter(&x, &y);
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if (done32)
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{
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cd.real(x);
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cd.imag(y);
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return true;
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}
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}
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}
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}
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}
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return false;
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}
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bool DecimatorC::decimate64(Complex c, Complex& cd)
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{
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float x = c.real();
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float y = c.imag();
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bool done2 = m_decimator2.workDecimateCenter(&x, &y);
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if (done2)
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{
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bool done4 = m_decimator4.workDecimateCenter(&x, &y);
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if (done4)
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{
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bool done8 = m_decimator8.workDecimateCenter(&x, &y);
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if (done8)
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{
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bool done16 = m_decimator16.workDecimateCenter(&x, &y);
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if (done16)
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{
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bool done32 = m_decimator32.workDecimateCenter(&x, &y);
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if (done32)
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{
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bool done64 = m_decimator32.workDecimateCenter(&x, &y);
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if (done64)
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{
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cd.real(x);
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cd.imag(y);
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return true;
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}
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}
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}
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}
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}
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}
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return false;
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}
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55
sdrbase/dsp/decimatorc.h
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55
sdrbase/dsp/decimatorc.h
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@ -0,0 +1,55 @@
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2020 Edouard Griffiths, F4EXB //
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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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// Half-band centered decimators with Complex (i.e. omplex<float>) input/output
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// Decimates by a power of two using centered half-band filters
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#ifndef INCLUDE_DSP_DECIMATORC_H_
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#define INCLUDE_DSP_DECIMATORC_H_
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#include "dsp/dsptypes.h"
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#include "dsp/inthalfbandfiltereof.h"
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#define DECIMATORSXS_HB_FILTER_ORDER 64
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class DecimatorC
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{
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public:
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DecimatorC();
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void setLog2Decim(unsigned int log2Decim);
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bool decimate(Complex c, Complex& cd);
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unsigned int getDecim() const { return m_decim; }
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private:
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IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator2; // 1st stages
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IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator4; // 2nd stages
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IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator8; // 3rd stages
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IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator16; // 4th stages
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IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator32; // 5th stages
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IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator64; // 6th stages
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unsigned int m_log2Decim;
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unsigned int m_decim;
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bool decimate2(Complex c, Complex& cd);
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bool decimate4(Complex c, Complex& cd);
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bool decimate8(Complex c, Complex& cd);
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bool decimate16(Complex c, Complex& cd);
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bool decimate32(Complex c, Complex& cd);
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bool decimate64(Complex c, Complex& cd);
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};
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#endif // INCLUDE_DSP_DECIMATORC_H_
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