Slightly improve the Hann windows

There's no need to include the 0 terms on the ends since they'll never
contribute a sample. So extend the width to have the 0 terms just outside the
window where it wouldn't contribute anyway.

2 files changed, 4 insertions, 4 deletions

diff --git a/alc/effects/fshifter.cpp b/alc/effects/fshifter.cpp
index 1e7d1962..2ad98231 100644
--- a/alc/effects/fshifter.cpp
+++ b/alc/effects/fshifter.cpp
@@ -50,8 +50,8 @@ std::array<double,HIL_SIZE> InitHannWindow()
     /* Create lookup table of the Hann window for the desired size, i.e. HIL_SIZE */
     for(size_t i{0};i < HIL_SIZE>>1;i++)
     {
-        constexpr double scale{al::MathDefs<double>::Pi() / double{HIL_SIZE-1}};
-        const double val{std::sin(static_cast<double>(i) * scale)};
+        constexpr double scale{al::MathDefs<double>::Pi() / double{HIL_SIZE}};
+        const double val{std::sin(static_cast<double>(i+1) * scale)};
         ret[i] = ret[HIL_SIZE-1-i] = val * val;
     }
     return ret;
diff --git a/alc/effects/pshifter.cpp b/alc/effects/pshifter.cpp
index 375681df..a91fd2fb 100644
--- a/alc/effects/pshifter.cpp
+++ b/alc/effects/pshifter.cpp
@@ -56,8 +56,8 @@ std::array<double,STFT_SIZE> InitHannWindow()
     /* Create lookup table of the Hann window for the desired size, i.e. STFT_SIZE */
     for(size_t i{0};i < STFT_SIZE>>1;i++)
     {
-        constexpr double scale{al::MathDefs<double>::Pi() / double{STFT_SIZE-1}};
-        const double val{std::sin(static_cast<double>(i) * scale)};
+        constexpr double scale{al::MathDefs<double>::Pi() / double{STFT_SIZE}};
+        const double val{std::sin(static_cast<double>(i+1) * scale)};
         ret[i] = ret[STFT_SIZE-1-i] = val * val;
     }
     return ret;