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| author | henry <henry@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2005-04-11 14:01:29 +0000 |
|---|---|---|
| committer | henry <henry@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2005-04-11 14:01:29 +0000 |
| commit | 1fd3c733d876abbbd0a3296105bdffae6c8a050c (patch) | |
| tree | ccfe07c7b2d4d5c1ce3836afe43500cb4b8bcad9 /libaf/af_hrtf.h | |
| parent | 7da5685bc3091c166ec2665789211cd2e81d0617 (diff) | |
| download | mpv-1fd3c733d876abbbd0a3296105bdffae6c8a050c.tar.bz2 mpv-1fd3c733d876abbbd0a3296105bdffae6c8a050c.tar.xz | |
More HRTF enhancements
- a passive locking mechanism to enable the matrix to switch between active
and passive mode, which enhances the stereo image.
- a center front cancellation algorithm that damps the cross-talk if the
sound is coming predominantly from center (e.g. if there is dialogue).
These two new features should enhance the quality of surround downmix
noticeably.
Also a correction to the active gain control is included. The previous
implementation of Lt + Rt/Lt - Rt AGC should be fine in most cases, but the
calculation was inconsistent (gain unitarity is not guaranteed to be
preserved).
Signed off by Yue Shi Lai <ylai@users.sourceforge.net>
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15125 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libaf/af_hrtf.h')
| -rw-r--r-- | libaf/af_hrtf.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libaf/af_hrtf.h b/libaf/af_hrtf.h index 5f3639eb7d..7501cbf194 100644 --- a/libaf/af_hrtf.h +++ b/libaf/af_hrtf.h @@ -4,6 +4,7 @@ /* Amplitude scaling factors */ #define M17_0DB 0.1414213562 +#define M9_03DB 0.3535533906 #define M6_99DB 0.4472135955 #define M4_77DB 0.5773502692 #define M3_01DB 0.7071067812 @@ -25,6 +26,10 @@ #define MATAGCTRIG 8.0 /* (Fuzzy) AGC trigger */ #define MATAGCDECAY 1.0 /* AGC baseline decay rate (1/samp.) */ +#define MATAGCLOCK 0.2 /* AGC range (around 1) where the + matrix behaves passively */ +#define MATCOMPGAIN 0.37 /* Cross talk compensation gain, + 0.50 - 0.55 is full cancellation. */ #define CFECHODELAY 360 /* Center front echo delay (samples) */ #define CFECHOAMPL M17_0DB /* Center front echo amplitude */ |