ScopeNG: moved Projector class to sdrbase to avoid excessive dependency on liquid-dsp

2026-06-07 08:24:43 -04:00 · 2018-04-03 18:51:21 +02:00
parent b856bc2aac
commit 8ce1c76a40
7 changed files with 191 additions and 144 deletions
@@ -0,0 +1,92 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2017 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                  //
+//                                                                               //
+// 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 "projector.h"
+#include "symsync.h" // dependency on liquid-dsp
+
+Projector::Projector(ProjectionType projectionType) :
+    m_projectionType(projectionType),
+    m_prevArg(0.0f),
+    m_cache(0),
+    m_cacheMaster(true)
+{}
+
+Projector::~Projector()
+{}
+
+Real Projector::run(const Sample& s)
+{
+    Real v;
+
+    if ((m_cache) && !m_cacheMaster) {
+        return m_cache[(int) m_projectionType];
+    }
+    else
+    {
+        switch (m_projectionType)
+        {
+        case ProjectionImag:
+            v = s.m_imag / SDR_RX_SCALEF;
+            break;
+        case ProjectionMagLin:
+        {
+            Real re = s.m_real / SDR_RX_SCALEF;
+            Real im = s.m_imag / SDR_RX_SCALEF;
+            Real magsq = re*re + im*im;
+            v = std::sqrt(magsq);
+        }
+            break;
+        case ProjectionMagDB:
+        {
+            Real re = s.m_real / SDR_RX_SCALEF;
+            Real im = s.m_imag / SDR_RX_SCALEF;
+            Real magsq = re*re + im*im;
+            v = log10f(magsq) * 10.0f;
+        }
+            break;
+        case ProjectionPhase:
+            v = std::atan2((float) s.m_imag, (float) s.m_real) / M_PI;
+            break;
+        case ProjectionDPhase:
+        {
+            Real curArg = std::atan2((float) s.m_imag, (float) s.m_real);
+            Real dPhi = (curArg - m_prevArg) / M_PI;
+            m_prevArg = curArg;
+
+            if (dPhi < -1.0f) {
+                dPhi += 2.0f;
+            } else if (dPhi > 1.0f) {
+                dPhi -= 2.0f;
+            }
+
+            v = dPhi;
+        }
+            break;
+        case ProjectionReal:
+        default:
+            v = s.m_real / SDR_RX_SCALEF;
+            break;
+        }
+
+        if (m_cache) {
+            m_cache[(int) m_projectionType] = v;
+        }
+
+        return v;
+    }
+}
+