diff options
| author | Koen Vos <koen.vos@skype.net> | 2011-12-13 23:47:31 +0400 |
|---|---|---|
| committer | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2011-12-13 23:47:31 +0400 |
| commit | bf75c8ec4d0dded188bc7793de6da56c7ff0be1c (patch) | |
| tree | c21bb05faf0a203b73e8f8aae90fc63dac27625d /silk/tuning_parameters.h | |
| parent | 6619a736376221f2782cecff55d051c3ecfc2ff7 (diff) | |
SILK fixes following last codec WG meeting
decoder:
- fixed incorrect scaling of filter states for the smallest quantization
step sizes
- NLSF2A now limits the prediction gain of LPC filters
encoder:
- increased damping of LTP coefficients in LTP analysis
- increased white noise fraction in noise shaping LPC analysis
- introduced maximum total prediction gain. Used by Burg's method to
exit early if prediction gain is exceeded. This improves packet
loss robustness and numerical robustness in Burg's method
- Prefiltered signal is now in int32 Q10 domain, from int16 Q0
- Increased max number of iterations in CBR gain control loop from 5 to 6
- Removed useless code from LTP scaling control
- Optimization: smarter LPC loop unrolling
- Switched default win32 compile mode to be floating-point
resampler:
- made resampler have constant delay of 0.75 ms; removed delay
compensation from silk code.
- removed obsolete table entries (~850 Bytes)
- increased downsampling filter order from 16 to 18/24/36 (depending on
frequency ratio)
- reoptimized filter coefficients
Diffstat (limited to 'silk/tuning_parameters.h')
| -rw-r--r-- | silk/tuning_parameters.h | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/silk/tuning_parameters.h b/silk/tuning_parameters.h index d42a9639..ff0d0b68 100644 --- a/silk/tuning_parameters.h +++ b/silk/tuning_parameters.h @@ -51,13 +51,11 @@ extern "C" /*********************/ /* LPC analysis defines: regularization and bandwidth expansion */ -#define FIND_LPC_COND_FAC 2.5e-5f -#define FIND_LPC_CHIRP 0.99995f -#define FIND_LPC_CHIRP_FIRST_FRAME 0.96f +#define FIND_LPC_COND_FAC 1e-5f /* LTP analysis defines */ #define FIND_LTP_COND_FAC 1e-5f -#define LTP_DAMPING 0.01f +#define LTP_DAMPING 0.05f #define LTP_SMOOTHING 0.1f /* LTP quantization settings */ @@ -108,7 +106,7 @@ extern "C" #define WARPING_MULTIPLIER 0.015f /* fraction added to first autocorrelation value */ -#define SHAPE_WHITE_NOISE_FRACTION 1e-5f +#define SHAPE_WHITE_NOISE_FRACTION 5e-5f /* noise shaping filter chirp factor */ #define BANDWIDTH_EXPANSION 0.95f |