Audio Modes
Reference Guide: evolution 5000 E5780 and E5782 Encoder
Page F-9
ST.RE.E10135.4
F.5.2 Clip
Levels
When analogue audio is selected then it is possible to set a clip level between 12 and 24 dB
inclusive, which is used in the A/D conversion. It refers to the maximum audio level that is
expected on the input, and if the detected level goes above this, then the audio clip alarm will
be raised.
The values below give an indication of how this clip level relates to voltages
(dBu is referenced to 0.775 V).
12dBu = 3.08 Vrms = 4.36 Vpeak
18dBu = 6.16 Vrms = 8.71V peak
24dBu = 12.28 Vrms = 17.37 Vpeak
NOTES…
1. The analogue input is balanced, so, connecting an unbalanced output causes the level to drop by
6dB.
2.
If impedance is incorrectly set this could lead to an unexpected audio level.
F.6 Summary
summarises the available coding standards and modes for the audio modules.
Table F.5: Summary of Audio Coding Modes and Standards.
Coding Standard
Module
Connector
Coding Mode
AAC
Advanced Audio 4A – 4D
HD SDI
Audio Input 2 (digital)
Stereo
Multichannel (5.1)
MPEG 1 Layer II
Audio A - B
HD SDI
Audio Input (Digital/Analog)
Audio Input (Analog)
Mono {Left/Right)
Dual Mono
Joint Stereo/Stereo
Dolby Digital
Audio A - B
HD SDI
Audio Input (Digital/Analog)
Strereo
1/0 (Left/Right)
Dolby Digital pass-thru
Audio A - B
HD SDI
Audio Input (Digital/Analog)
As pre-encoded
Dolby Digital pass-thru
Advanced Audio 4A – 4D
HD SDI
Audio Input 2 (Digital)
As pre-encoded but with glitch
suppression
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