Ericsson SPR1100 Operations Instructions download pdf (Page 296)

Automatic Loudness Control

- Measure + ALC + LTLC - Measurements are taken and corrections are

made for short term peak in audio that are measured 1 LU above the target

level. Corrections are also made over the longer term to adjust the channel

loudness level to that of the target level.

Note: In this mode manual gain adjustment from the codec page is disabled.

 Target Level - The desired loudness level for the channel. This should normally

be set to the level specified by local legislation for the expected audio loudness

level.

 Timer Period - This controls the responsiveness of the long term audio

loudness level correction. A smaller number will result in the audio being

adjusted more dynamically. A larger value will give a slower less noticeable

adjustment. If the response is increased then the level will change more

frequently. This can result in reducing the dynamics of the audio material. A

slower response will have less effect on the audio however if the input level

changes then the audio level will take longer to adjust to the target level. This is

a balance between the two factors that needs to be decided upon by the

operator.

 Peak Limit - This controls a hard clipping limiter for the audio level. This

adjustment is based on the absolute peak level measured in dBFS. The peak

limiter only operates in Measure + ALC and Measure + ALC + LTLC modes. If

this value is set to 0, no limiting is performed.

 Maximum Boost - This control determines the maximum amount of gain that

the LTLC algorithm can apply. This is to prevent over adjustment which can lead

to unwanted audio artifacts.

 Maximum Attenuation - This control determines the maximum amount of

attenuation that the ALC and the LTLC algorithm can apply. This is to prevent

over adjustment which can lead to unwanted audio artifacts.

 Preset - The available options are Subtle, Standard and Strong. This setting

controls the aggressiveness of the corrections performed by the Short Term

ALC algorithm. It controls how quickly the correction takes place and the

strength of the correction

F.2.2.4 Status Values

 Integrated Loudness - This is

the long term measurement that shows the

channel loudness since configuration or the last reset request. After running for

a period of time this could be expected to show little response but will show the

long average loudness for the channel. This displays the input level before

any correction is applied.

 Short Term Loudness - This is the short term measurement that shows the

loudness of the channel measured over the last 3 seconds. This displays the

input level before any correction is applied.

 Current Adjustment - This is the current correction that the ALC and LTLC

algorithms are applying to the audio. This changes slowly due to the nature of

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Ericsson SPR1100 Operations Instructions Page 296

Comments to this Manuals

Ericsson SPR1100 Operations Instructions Page 296

Comments to this Manuals

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