diff --git a/pcsx2/CMakeLists.txt b/pcsx2/CMakeLists.txt
index 6654fbf422..a375a25bcd 100644
--- a/pcsx2/CMakeLists.txt
+++ b/pcsx2/CMakeLists.txt
@@ -242,7 +242,6 @@ set(pcsx2SPU2Sources
SPU2/Debug.cpp
SPU2/DplIIdecoder.cpp
SPU2/Dma.cpp
- SPU2/Lowpass.cpp
SPU2/Mixer.cpp
SPU2/spu2.cpp
SPU2/ReadInput.cpp
@@ -276,7 +275,6 @@ set(pcsx2SPU2Headers
SPU2/Dma.h
SPU2/Global.h
SPU2/interpolate_table.h
- SPU2/Lowpass.h
SPU2/Mixer.h
SPU2/spu2.h
SPU2/regs.h
diff --git a/pcsx2/SPU2/Lowpass.cpp b/pcsx2/SPU2/Lowpass.cpp
deleted file mode 100644
index 7eff1aa448..0000000000
--- a/pcsx2/SPU2/Lowpass.cpp
+++ /dev/null
@@ -1,93 +0,0 @@
-/* PCSX2 - PS2 Emulator for PCs
- * Copyright (C) 2002-2020 PCSX2 Dev Team
- *
- * PCSX2 is free software: you can redistribute it and/or modify it under the terms
- * of the GNU Lesser General Public License as published by the Free Software Found-
- * ation, either version 3 of the License, or (at your option) any later version.
- *
- * PCSX2 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 for more details.
- *
- * You should have received a copy of the GNU General Public License along with PCSX2.
- * If not, see .
- */
-
-#include "PrecompiledHeader.h"
-#include "Global.h"
-#include "Lowpass.h"
-#include
-#include
-
-template
-__forceinline LowPassFilter::LowPassFilter(FloatType freq, FloatType srate)
-{
- typedef FloatType FT;
-
- FloatType omega = (FT)2.0 * freq / srate;
- static const FloatType g = (FT)1.0;
-
- // calculating coefficients:
-
- FloatType k, p, q, a;
- FloatType a0, a1, a2, a3, a4;
-
- k = ((FT)4.0 * g - (FT)3.0) / (g + (FT)1.0);
- p = (FT)1.0 - (FT)0.25 * k;
- p *= p;
-
- // LP:
- a = (FT)1.0 / (tan((FT)0.5 * omega) * ((FT)1.0 + p));
- p = (FT)1.0 + a;
- q = (FT)1.0 - a;
-
- a0 = (FT)1.0 / (k + p * p * p * p);
- a1 = (FT)4.0 * (k + p * p * p * q);
- a2 = (FT)6.0 * (k + p * p * q * q);
- a3 = (FT)4.0 * (k + p * q * q * q);
- a4 = (k + q * q * q * q);
- p = a0 * (k + (FT)1.0);
-
- coef[0] = p;
- coef[1] = (FT)4.0 * p;
- coef[2] = (FT)6.0 * p;
- coef[3] = (FT)4.0 * p;
- coef[4] = p;
- coef[5] = -a1 * a0;
- coef[6] = -a2 * a0;
- coef[7] = -a3 * a0;
- coef[8] = -a4 * a0;
-}
-
-// Processes a single sample into the LPF.
-template
-__forceinline FloatType LowPassFilter::sample(FloatType inval)
-{
- const FloatType out = (coef[0] * inval) + d[0];
- d[0] = (coef[1] * inval) + (coef[5] * out) + d[1];
- d[1] = (coef[2] * inval) + (coef[6] * out) + d[2];
- d[2] = (coef[3] * inval) + (coef[7] * out) + d[3];
- d[3] = (coef[4] * inval) + (coef[8] * out);
-
- return out;
-}
-
-LowPassFilter32::LowPassFilter32(float freq, float srate)
- : impl_lpf(freq, srate)
-{
-}
-
-LowPassFilter64::LowPassFilter64(double freq, double srate)
- : impl_lpf(freq, srate)
-{
-}
-
-float LowPassFilter32::sample(float inval)
-{
- return impl_lpf.sample(inval);
-}
-
-double LowPassFilter64::sample(double inval)
-{
- return impl_lpf.sample(inval);
-}
diff --git a/pcsx2/SPU2/Lowpass.h b/pcsx2/SPU2/Lowpass.h
deleted file mode 100644
index f6ae6bd2ee..0000000000
--- a/pcsx2/SPU2/Lowpass.h
+++ /dev/null
@@ -1,42 +0,0 @@
-/* PCSX2 - PS2 Emulator for PCs
- * Copyright (C) 2002-2020 PCSX2 Dev Team
- *
- * PCSX2 is free software: you can redistribute it and/or modify it under the terms
- * of the GNU Lesser General Public License as published by the Free Software Found-
- * ation, either version 3 of the License, or (at your option) any later version.
- *
- * PCSX2 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 for more details.
- *
- * You should have received a copy of the GNU General Public License along with PCSX2.
- * If not, see .
- */
-
-#pragma once
-
-template
-struct LowPassFilter
-{
- FloatType coef[9];
- FloatType d[4];
-
- LowPassFilter(FloatType freq, FloatType srate);
- FloatType sample(FloatType inval);
-};
-
-struct LowPassFilter32
-{
- LowPassFilter impl_lpf;
-
- LowPassFilter32(float freq, float srate);
- float sample(float inval);
-};
-
-struct LowPassFilter64
-{
- LowPassFilter impl_lpf;
-
- LowPassFilter64(double freq, double srate);
- double sample(double inval);
-};
diff --git a/pcsx2/pcsx2.vcxproj b/pcsx2/pcsx2.vcxproj
index 77a1a41fdc..ec220cc320 100644
--- a/pcsx2/pcsx2.vcxproj
+++ b/pcsx2/pcsx2.vcxproj
@@ -340,7 +340,6 @@
-
@@ -775,7 +774,6 @@
-
diff --git a/pcsx2/pcsx2.vcxproj.filters b/pcsx2/pcsx2.vcxproj.filters
index 6348fa78af..f73ec26b28 100644
--- a/pcsx2/pcsx2.vcxproj.filters
+++ b/pcsx2/pcsx2.vcxproj.filters
@@ -1059,9 +1059,6 @@
System\Ps2\SPU2
-
- System\Ps2\SPU2
-
System\Ps2\SPU2
@@ -2098,9 +2095,6 @@
System\Ps2\SPU2
-
- System\Ps2\SPU2
-
System\Ps2\SPU2