0008B - Audio Dropouts
Summary
EBU QC Id
0008B
Name
Audio Dropouts
Status
published
Category
objective
Lead editor
Eric Carson
Aliases
digital drop-out analogue drop-out
Tags
audio
Versions
Version Status Edition date Saved by Note
Details
Definition
System shall determine if audio dropouts exist in an analogue or digital audio programme or service.
References
Examples
  • 10:39:00:00 - 10:39:04:00 audio drop-out type 1 (with return to audio) found in audio with PID 1.


  • uploads/items/example_images/0008Bex001.jpg

  • uploads/items/example_images/0008Bex002.jpg

Input parameters
Name Description
Output parameters
Name Description
Test material
Title Version Download
Remarks
Remarks
System will determine the average audio level (to confirm that the average level is above the user specified threshold for this test), and look for a dropout below a silence threshold, with the release ratio of the waveform being at or below the user specified threshold for at least the user specified dropout time.

Option 1 (Dropout With Return to Audio):
The user defines the minimum and maximum amount of time that a dropout should occur before the Verification Unit reports an event.
Additionally, the user defines the attack and release ratios of the audio surrounding the dropout, since dropouts are normally a squared-like pattern in the time domain.
Additionally, the user can define the average audio level that must occur above the dropout, to ensure that only dropouts that would be noticed by the listener are reported. [see example image 1]

Option 2 (Dropout Without Return to Audio):
It is possible that audio is not resumed after a dropout, the user can select this option to look for dropouts that never recover. The same user inputs are used, although the attack ratio is not taken into account. [see example image 2]

If attack and release ratio are not specified by the user, the vendor test should assume a viable attack and release ratio to use to find the dropout.

User discussions
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