#12613 NORM Not Tri: Mic bias pop recorded loudly in Record on XO-4

Zarro Boogs per Child bugtracker at laptop.org
Fri Mar 8 13:47:04 EST 2013

#12613: Mic bias pop recorded loudly in Record on XO-4
 Reporter:  greenfeld  |                 Owner:                                   
     Type:  defect     |                Status:  new                              
 Priority:  normal     |             Milestone:  Not Triaged                      
Component:  kernel     |               Version:  Development build as of this date
 Keywords:             |           Next_action:  diagnose                         
 Verified:  0          |   Deployment_affected:                                   
Blockedby:             |              Blocking:                                   
 1. Record a video for a few seconds in Record on XO-4 in 13.1.0 os35.
  2. Playback said video.  There will be a loud pop heard at the start of
 the video, possibly from the mic bias being turned on.

 Similar power-on pops can be seen on a XO-1.75 (as well as maybe earlier
 models) and heard in Audacity, although not as loudly.  Audacity's
 waveform view will show a sharp arc at the start of its recordings which
 overshoots the centerline and then comes back to it when the recording
 circuitry powers up.

Ticket URL: <http://dev.laptop.org/ticket/12613>
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