Bosch ndn-921 用户手册

en | Advanced Mode

FlexiDomeHD 720p IP Camera

AR18-10-B013 | v1.52 | 2011.06

Installation and Operation Manual

Bosch Security Systems

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.

Select On for the device to generate audio alarms.

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 &.)

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.

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.

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.