[mythtv-commits] Ticket #8568: Vuvuzela filter

MythTV mythtv at cvs.mythtv.org
Wed Jun 16 12:53:03 UTC 2010


#8568: Vuvuzela filter
-----------------------------------+----------------------------------------
 Reporter:  jyavenard              |       Owner:  jyavenard  
     Type:  enhancement            |      Status:  new        
 Priority:  minor                  |   Milestone:  unknown    
Component:  MythTV - Audio Output  |     Version:  Unspecified
 Severity:  medium                 |     Mlocked:  0          
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 Watching the football worlcup? Annoyed with those horns ?

 this patch will help.

 It is implemented by filtering the frequencies 233, 466, 932 and 1864Hz
 using a band-stop filter (notch filter)

 Was provided the info from:
 http://www.afterdawn.com/news/article.cfm/2010/06/14/vuvuzela_buzz_ruining_your_world_cup_get_rid_of_it

 It is not perfect, but once active, you can finally hear people cheering..

 May commit it for convenience, but I feel the bi-quad filters parameters
 could be improved. If people are willing to tweak a bit, this is done in
 the file mythtv/libs/libmyth/audiooutpututil.cpp in void
 AudioOutputUtil::notch_update()

 By the way, the methods provided in the above link, don't give IMHO as
 good results.

 How to use it:
 Go to the settings -> general in the audio section.
 Activate Advanced Audio and check the Vuvuzela box. Validate all pages to
 the end.

 Now when watching a game, press menu, you'll see an entry "Toggle Vuvuzela
 Filter"

 The vuvuzela filter is disabled by default, and needs to be manually
 enabled each time

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/8568>
MythTV <http://www.mythtv.org/>
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