From 5069f042fa8478648214a7038d87ae976a041751 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Thu, 19 Jan 2023 13:03:09 -0800
Subject: Improve the output scaling of the pitch shifter
For tones than land exactly on a frequency bin, which are subject to the least
amount of error when not adjusted, this produces a level that more closely
matches the original input.
---
alc/effects/pshifter.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
(limited to 'alc/effects/pshifter.cpp')
diff --git a/alc/effects/pshifter.cpp b/alc/effects/pshifter.cpp
index 8d4aa630..121cdcd3 100644
--- a/alc/effects/pshifter.cpp
+++ b/alc/effects/pshifter.cpp
@@ -277,7 +277,7 @@ void PshifterState::process(const size_t samplesToDo,
*/
inverse_fft(al::as_span(mFftBuffer));
- static constexpr double scale{4.0 / OversampleFactor / StftSize};
+ static constexpr double scale{3.0 / OversampleFactor / StftSize};
for(size_t dst{mPos}, k{0u};dst < StftSize;++dst,++k)
mOutputAccum[dst] += gWindow.mData[k]*mFftBuffer[k].real() * scale;
for(size_t dst{0u}, k{StftSize-mPos};dst < mPos;++dst,++k)
--
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