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author | Paul B Mahol <onemda@gmail.com> | 2017-05-14 19:30:12 +0300 |
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committer | Paul B Mahol <onemda@gmail.com> | 2017-05-17 21:18:39 +0300 |
commit | deaab31d61fd3679491a5e81cd26432886815ddf (patch) | |
tree | accbc68fcf0b77c68dfd16dfd7a44f0c3815610b /doc | |
parent | 94d05ff15985d17aba070eaec82acd21c0da3d86 (diff) |
avfilter: add audio crossfeed filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'doc')
-rw-r--r-- | doc/filters.texi | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index a7c6063969..69907d4f75 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -2251,6 +2251,35 @@ Set temperature degree in Celsius. This is the temperature of the environment. Default is 20. @end table +@section crossfeed +Apply headphone crossfeed filter. + +Crossfeed is the process of blending the left and right channels of stereo +audio recording. +It is mainly used to reduce extreme stereo separation of low frequencies. + +The intent is to produce more speaker like sound to the listener. + +The filter accepts the following options: + +@table @option +@item strength +Set strength of crossfeed. Default is 0.2. Allowed range is from 0 to 1. +This sets gain of low shelf filter for side part of stereo image. +Default is -6dB. Max allowed is -30db when strength is set to 1. + +@item range +Set soundstage wideness. Default is 0.5. Allowed range is from 0 to 1. +This sets cut off frequency of low shelf filter. Default is cut off near +1550 Hz. With range set to 1 cut off frequency is set to 2100 Hz. + +@item level_in +Set input gain. Default is 0.9. + +@item level_out +Set output gain. Default is 1. +@end table + @section crystalizer Simple algorithm to expand audio dynamic range. |