#11187 NORM 1.75-so: XO-1.75 activity and application audio sounds raspy

[Zarro Boogs per Child]

#11187: XO-1.75 activity and application audio sounds raspy
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           Reporter:  greenfeld  |       Owner:  saadia       
               Type:  defect     |      Status:  new          
           Priority:  normal     |   Milestone:  1.75-software
          Component:  kernel     |     Version:  1.75-B1      
         Resolution:             |    Keywords:               
        Next_action:  diagnose   |    Verified:  0            
Deployment_affected:             |   Blockedby:  10831        
           Blocking:             |  
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Comment(by wad):

 Replying to [comment:6 greenfeld]:
 > Most voice codecs have sampling rates below 22.05 kHz.
 >
 > Has anyone regularly used these on XOs?  And if so does the XO-1.5 have
 a similar limitation?

 Don't confuse the channel sampling rate with the playback rate.  Just
 because a voice coded bandlimits and drops the sampling rate before
 encoding doesn't mean that the decoded audio isn't upsampled to a higher
 frequency before playback.

 In XO-1.5, the HD Audio codec only supported 48 KHz or higher.  Somewhere
 in our middleware (GStreamer ?) software is upsampling any lower
 resolution audio before playback.

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Ticket URL: <http://dev.laptop.org/ticket/11187#comment:7>
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