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Operating the Equipment Locally — Audio Menu: MPEG Layer 2
Page 4-60
Reference Guide: E57xx DSNG and DENG Voyager Encoder
ST.RE.E10076.3
Hardware Release Option
This option indicates the hardware version of this audio encode channel. It
is for status only and cannot be changed.
Software Release Option
This option indicates the software version of this audio encoder channel. It
is for status only and cannot be changed.
Audio Delay Option
This option is only available if the Auto Lip Sync option is set to Off. It sets
the delay that should be applied to the audio.
Table 4.45: Audio Delay Options
Valid Input Range
Description
Min: 111
Max: 3540
Audio Delay in milliseconds.
Actual Audio Delay
Shows the actual audio delay. It is for status only and cannot be changed.
Clip Level Option
This option is only displayed if the audio source is set to analogue. It
enables the audio clip level to be set. That is, the head room above 0 dBu
prior to the audio being clipped.
NOTE…
The clip levels available depend on the hardware issue of the Encoder.
Table 4.46: Clip Level Options
Selected Option
Description
12 dB
12 dB audio clipping level.
15 dB
15 dB is only available with PCB issue 4 and later.
18 dB
18 dB audio clipping level.
Impedance Option
This option is only displayed if the audio source is set to analogue. It
enables the input impedance of the analogue audio input to be set to
either 600
Ω
or 20 k
Ω
.
Deemphasis Option
This option is turned on in order to de-emphasise pre-emphasised audio
input into the Encoder.
To meet the MPEG Layer 2 audio encoding algorithm specification, the
audio must not have pre-emphasis applied. If the input signal does have
pre-emphasis applied, a de-emphasis filtering process must be applied
prior to encoding.
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