94 en Advanced Mode

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9.6.6Audio Alarm

Create alarms based on audio signals. Configure signal strengths and frequency ranges so that false alarms, for example, machine noise or background noise, are avoided. Set up normal audio transmission before configuring the audio alarm.

Audio alarm

Select On for the device to generate audio alarms.

Name

The name makes it easier to identify the alarm in extensive video monitoring systems, for example with the VIDOS and Bosch Video Management System programs. Enter a unique and clear name here. (Do not use any special characters, for example &.)

Signal Ranges

Exclude particular signal ranges in order to avoid false alarms. For this reason the total signal is divided into 13 tonal ranges (mel scale). Check or uncheck the boxes below the graphic to include or exclude individual ranges.

Threshold

Set up the threshold on the basis of the signal visible in the graphic Set the threshold using the slide control or, alternatively, move the white line directly in the graphic using the mouse.

Sensitivity

Use this setting to adapt the sensitivity to the sound environment and effectively suppress individual signal peaks. A high value represents a high level of sensitivity.

AR18-10-B013 v1.52 2011.06 Installation and Operation Manual

Bosch Security Systems

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Bosch Appliances NDN-921 operation manual Audio Alarm, Audio alarm, Name, Signal Ranges, Threshold

NDN-921 specifications

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