Added +12 dB compensation on measurement of the spectrum to match the…

… amplitude of the pure sine wave on the graph
lsp-plugins · Sep 12, 2024 · e143ee0 · e143ee0
1 parent 5665724
commit e143ee0
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Showing 3 changed files with 7 additions and 5 deletions.
diff --git a/CHANGELOG b/CHANGELOG
@@ -3,7 +3,8 @@
 *******************************************************************************
 
 === 1.0.27 ===
-
+* Added +12 dB compensation on measurement of the spectrum to match the amplitude
+  of the pure sine wave on the graph.
 
 === 1.0.26 ===
 * Updated build scripts and dependencies.

diff --git a/include/private/meta/spectrum_analyzer.h b/include/private/meta/spectrum_analyzer.h
@@ -48,7 +48,8 @@ namespace lsp
 
             static constexpr float          THRESH_HI_DB        = 0.0f;
             static constexpr float          THRESH_LO_DB        = -48.0f;
-            static constexpr float          SPECTRALIZER_BOOST  = 16.0f;
+            static constexpr float          SPECTRALIZER_BOOST  = GAIN_AMP_P_24_DB;
+            static constexpr float          ANALYZER_BOOST      = GAIN_AMP_P_12_DB;
             static constexpr size_t         MMESH_STEP          = 16;
             static constexpr size_t         WND_DFL             = dspu::windows::HANN;
             static constexpr size_t         ENV_DFL             = dspu::envelope::PINK_NOISE;

diff --git a/src/main/plug/spectrum_analyzer.cpp b/src/main/plug/spectrum_analyzer.cpp
@@ -736,7 +736,7 @@ namespace lsp
             // Apply gain
             float gain = (flags & F_BOOST) ?
                     vChannels[channel].fGain * meta::spectrum_analyzer::SPECTRALIZER_BOOST:
-                    vChannels[channel].fGain ;
+                    vChannels[channel].fGain * meta::spectrum_analyzer::ANALYZER_BOOST;
             dsp::mul_k2(dst, gain * fPreamp, meta::spectrum_analyzer::MESH_POINTS);
 
             // Apply log scale if necessary
@@ -926,8 +926,8 @@ namespace lsp
                     {
                         size_t idx  = fSelector * ((fft_size - 1) >> 1);
                         pFrequency->set_value(float(idx * fSampleRate) / float(fft_size));
-                        float lvl = sAnalyzer.get_level(nChannel, idx);
-                        pLevel->set_value(lvl * c->fGain * fPreamp );
+                        float lvl = sAnalyzer.get_level(nChannel, idx) * meta::spectrum_analyzer::ANALYZER_BOOST;
+                        pLevel->set_value(lvl * c->fGain * fPreamp);
                     }
 
                     // Mesh is requested?