• Blackmagic Design

  popping on audio output from multibridge

  Posted by Keith Mottram on October 24, 2005 at 5:19 pm

  Hi anyone shed light on why when I change aplications or even swap to capture from the timeline in FCP that I get a loud electrical popping noise through my amp? Its rather unpleasant, is this a fault or standard?

  Thanks

  Keith

  Luke Maslen replied 20 years, 6 months ago 3 Members · 8 Replies
• 8 Replies

• 

  Viveck

  October 25, 2005 at 4:42 am

  yes it’s annoyingly standard on analog outputs but surprisingly it doesn’t happen on the SPDIF out (RCA out on the card)

  vB
• 

  Luke Maslen

  October 25, 2005 at 7:51 am

  Hi Keith,

  We’ll try to test that tomorrow and get back to you.

  Regards,

  Luke Maslen
  Blackmagic Design
• 

  Keith Mottram

  October 25, 2005 at 9:21 am

  Cheers Luke,

  I also noticed a large lag (several frames) on the audio output from the HDLink.

  Keith
• 

  Luke Maslen

  October 26, 2005 at 1:52 am

  Hi Keith,

  Which monitor do you have connected to the HDLink? There should only be a lag if the format of video does not match the capabilities of your monitor and in which case HDLink performs pulldown processing to display video on your monitor. It also delays the analog audio output by the same amount to keep the audio in sync with the video.

  Regards,

  Luke Maslen
  Blackmagic Design
• 

  Keith Mottram

  October 26, 2005 at 9:16 am

  video is in sync with broadcast and other outputs from multibridge, the only thing out is the audio from the hdlink output. monitor connected is 23″ apple, but as i said picture is sync.

  Keith
• 

  Luke Maslen

  October 27, 2005 at 4:27 am

  Hi Keith,

  Can you please check if the audio output on Multibridge is in or out of sync with the video from Multibridge. My suspicion is that the audio and video are out of sync right from the start and that HDLink is faithfully playing the audio in the way it has been delivered. Your test with Multibridge would verify that suspicion either way.

  Regards,

  Luke Maslen
  Blackmagic Design
• 

  Luke Maslen

  October 30, 2005 at 10:59 pm

  Hi Keith,

  We have replicated this on the RCA analog monitoring outputs but the XLR analog outputs did not exhibit the problem? I will ask the engineers to fix this in a firmware update as it would be annoying. Does this match what you have observed? Thank you for bringing the problem to our attention.

  Regards,

  Luke Maslen
  Blackmagic Design
• 

  Luke Maslen

  October 30, 2005 at 11:01 pm

  Hi Keith,

  We have replicated this on the RCA analog monitoring outputs but the XLR analog outputs did not exhibit the problem? I will ask the engineers to fix this in a firmware update as it would be annoying. Does this match what you have observed? Thank you for bringing the problem to our attention.

  Regards,

  Luke Maslen
  Blackmagic Design

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