From: Paul Brossier <piem@piem.org>
Date: Tue, 30 Oct 2018 09:13:46 +0000 (+0100)
Subject: [mathutils] increase ln(2) precision in freqtomidi/miditofreq
X-Git-Tag: 0.4.8~92^2^2~1
X-Git-Url: https://git.aubio.org/?a=commitdiff_plain;h=5ce504dbacd2d43d84c951bdfc900fcd6f2a8065;p=aubio.git

[mathutils] increase ln(2) precision in freqtomidi/miditofreq
---

diff --git a/src/mathutils.c b/src/mathutils.c
index a40900ce..b9de9e55 100644
--- a/src/mathutils.c
+++ b/src/mathutils.c
@@ -522,7 +522,7 @@ aubio_freqtomidi (smpl_t freq)
   if (freq < 2. || freq > 100000.) return 0.; // avoid nans and infs
   /* log(freq/A-2)/log(2) */
   midi = freq / 6.875;
-  midi = LOG (midi) / 0.69314718055995;
+  midi = LOG (midi) / 0.6931471805599453;
   midi *= 12;
   midi -= 3;
   return midi;
@@ -534,7 +534,7 @@ aubio_miditofreq (smpl_t midi)
   smpl_t freq;
   if (midi > 140.) return 0.; // avoid infs
   freq = (midi + 3.) / 12.;
-  freq = EXP (freq * 0.69314718055995);
+  freq = EXP (freq * 0.6931471805599453);
   freq *= 6.875;
   return freq;
 }