Praesideo 3.5 Installation and User Instructions 9 System Configuration

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8Select the attenuation range from the AVC range dropdown list.

Note

A value of 12 dB is a practical value. A higher value will result in lower call volume levels when the ambient noise volume level decreases.

9Go to the Audio processing page of the audio input to which the sensing microphone is connected. A screen similar to the one in figure 49.2 appears.

figure 49.2: AVC calibration button

10Click the Start AVC calibration button to start the calibration of the AVC. This results in a loud wobble tone (duration: 15 s) in the zones that use this audio input to measure the ambient noise level. After the wobble tone, there will be a silence (duration: 15 s). Then a notification appears with the calibration result. The zone is not available for calls during calibration, because all audio outputs in the zone are used to distribute the calibration tone.

Temporarily reset extremely long audio delay settings (> 2 s) of the power amplifiers to a low value to avoid that the wobble tone is not yet present when calibration of the AVC starts.

Note

During the calibration, the system uses one digital audio channel of the optical network to distribute the calibration tone. This temporarily decreases the number of available digital audio channels in the system.

The following messages can appear during or after calibration:

•AVC calibration running

Displayed during the calibration process.

•AVC calibration completed, range = x dB Displayed after successful calibration. The range shows the available AVC range in this situation. The sum of the AVC range and the call margin that is configured for a zone should be less than the indicated available range.

•AVC calibration failed: sensing signal too high

Input overloaded by a ambient sensing signal that is too high. Use a less sensitive microphone, use an attenuation pad, or choose a different sensing location.

•AVC calibration failed: available range too small The difference between the measured ambient sensing signal with and without calibration tone is less than 6 dB. The available Praesideo output level is too low compared to the existing ambient noise at the sensing location.

•AVC calibration failed: ambient sensing input or its unit is defect or disabled

AVC calibration and AVC is not possible with a defect or disabled audio input for the ambient sensing signal.

•AVC calibration failed: no AVC output is available AVC calibration and AVC is not possible without a zone being configured for AVC using this audio input for sensing. The calibration tone cannot be broadcast.

Note

The AVC calibration requires the Wobble tone to be present in the tone set. If necessary, use Activate new tone set (see section 44.4).

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual AVC calibration running
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