Ericsson SPR1100 Operations Instructions download pdf (Page 294)

Automatic Loudness Control

F.2.2 Configuration

F.2.2.1 Basic Configuration

Make sure the unit has the required number of ALC licenses, one license is required

per stereo pair or part of (for details see section F.4.3 Licensing). This can be

viewed on the Configuration > Licenses web page.

To configure

ALC from the web interface select the card in use for the audio

encoding and then select the appropriate audio module and audio encode instance.

On the audio encode menu select the select the Automatic Loudness Control

menu, see Figure F.2 below.

Figure F.2 Audio Component > Encode Tab > Automatic Loudness Control

1. Configure the operating mode. For short term only corrections select the

Measure + ALC option. For short term corrections and longer term channel

level adjustment select Measure + ALC + LTLC. If using Measure + ALC, then

for correct operation the nominal level of the incoming audio should be

approximately the same as the Target Level.

2. Set the Target Level. This should normally be the regulation prescribed

loudness level. This is the desired loudness level for the long term level

adjustment. The EBU recommendation as found in EBU R128 is -23 LU. The

ATSC recommendation as found in ATSC/A85 is -24 LKFS.

3. Select the Time Period, this is the response time for the adjustments of the

long term level correction. 20 minutes would be a suitable starting value, if the

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Ericsson SPR1100 Operations Instructions Page 294