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changeset 776:9acebca96dcc

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Adjust frequency computation formula.
author Matti Hamalainen <ccr@tnsp.org>
date Thu, 23 May 2013 23:48:24 +0300
parents 4ff7d7f6f4d1
children ed60a7ee3ebb
files minijss/jssplr.c
diffstat 1 files changed, 2 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/minijss/jssplr.c	Thu May 23 23:47:21 2013 +0300
+++ b/minijss/jssplr.c	Thu May 23 23:48:24 2013 +0300
@@ -5,9 +5,6 @@
  */
 #include "jssplr.h"
 
-// FIXME!! FIX ME!
-#include <math.h>
-
 /* Miscellaneous tables
  */
 static const Uint8 jmpSineTab[32] =
@@ -100,7 +97,8 @@
         else
         {
             // Frequency = Frequency = 8363*2^((6*12*16*4 - Period) / (12*16*4))
-            chn->cfreq = chn->freq = 8363.0f * pow(2.0f, (4608.0f - (double) value) / 768.0f);
+            //chn->cfreq = chn->freq = 8363.0f * pow(2.0f, (4608.0f - (double) value) / 768.0f);
+            chn->cfreq = chn->freq = 8363 * (1 << ((4608 - value) / 768));
         }
 
         JMPSETNDFLAGS(cdfNewFreq);