ref: 49f76805ba9ee5672ba882a0152ca87bdbf0ed1e
parent: 097c5be8dce1456cacee3322b98c7ad1a428cdb6
author: Jean-Marc Valin <[email protected]>
date: Thu Jan 27 12:01:59 EST 2011
Adjusting pre-emphasis coefs to be exact in 16-bit precision
--- a/libcelt/modes.c
+++ b/libcelt/modes.c
@@ -316,26 +316,26 @@
approximate that. */
if(Fs < 12000) /* 8 kHz */
{- mode->preemph[0] = QCONST16(.35f, 15);
- mode->preemph[1] = -QCONST16(.18f, 15);
- mode->preemph[2] = QCONST16(.272f, SIG_SHIFT);
- mode->preemph[3] = QCONST16(3.6765f, 13);
+ mode->preemph[0] = QCONST16(0.3500061035f, 15);
+ mode->preemph[1] = -QCONST16(0.1799926758f, 15);
+ mode->preemph[2] = QCONST16(0.2719726562f, SIG_SHIFT);
+ mode->preemph[3] = QCONST16(3.6765136719f, 13);
} else if(Fs < 24000) /* 16 kHz */
{- mode->preemph[0] = QCONST16(.6f, 15);
- mode->preemph[1] = -QCONST16(.18f, 15);
- mode->preemph[2] = QCONST16(.4425f, SIG_SHIFT);
+ mode->preemph[0] = QCONST16(0.6000061035f, 15);
+ mode->preemph[1] = -QCONST16(0.1799926758f, 15);
+ mode->preemph[2] = QCONST16(0.4425048828f, SIG_SHIFT);
mode->preemph[3] = QCONST16(2.259887f, 13);
} else if(Fs < 40000) /* 32 kHz */
{- mode->preemph[0] = QCONST16(.78f, 15);
- mode->preemph[1] = -QCONST16(.1f, 15);
+ mode->preemph[0] = QCONST16(0.7799987793f, 15);
+ mode->preemph[1] = -QCONST16(0.1000061035f, 15);
mode->preemph[2] = QCONST16(.75f, SIG_SHIFT);
- mode->preemph[3] = QCONST16(1.33333333f, 13);
+ mode->preemph[3] = QCONST16(1.3333740234f, 13);
} else /* 48 kHz */
{- mode->preemph[0] = QCONST16(.85f, 15);
- mode->preemph[1] = QCONST16(.0f, 15);
+ mode->preemph[0] = QCONST16(0.8500061035f, 15);
+ mode->preemph[1] = QCONST16(0.0f, 15);
mode->preemph[2] = QCONST16(1.f, SIG_SHIFT);
mode->preemph[3] = QCONST16(1.f, 13);
}