Configuration Instructions

Configuration pages – Overview

'Audio Input Configuration'

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'Output'

Assignment of the set value to a local output. This output signal will be used for

calculation of the AVC algorithm.

'Threshold'

AVC takes effect if the noise level at input 4 is above this value.

'Max Attenuation' (Max Att.)

Maximum range of volume control for the AVC algorithm in dB.

'Attack'

Attack rate of the signal in dB/s. A larger value means faster sound level up if the

noise level increases.

'Release'

Release rate of the signal in dB/s. A larger value means faster volume down if the

noise level decreases.

'Averaging Time'

Defines the measurement cycle time. A larger number will make the AVC algorithm

more stable, but if the interval is too long, the system will need more time to react

to noise level changes.

'Feedback Factor'

This value is used for signal feedback of the configured output. A large feedback

factor means that most of the level of the output is subtracted from the feedback

input level. So the noise is very loud.

'Show RMS'

Input 1 and 2 level meters display measured RMS values to observe the AVC

calculation behavior.

6.2.6.3 AVC-based analog measurement

Since FW1.3B5, dedicated hardware connected on I/O Expander and 1, 2 or 4

analog values can be used to generate up to 4 AVC values.

Fig. 64: AVC-based analog measurement

NOTICE

The connections must be made on the first 1...4 analog inputs of the first

expander.

Click the AVC level meter to view the next AVC value.