ASL’s Dynamic Ambient Noise Sensor (DANS) features technology that intelligently ensures the optimum volume of announcements in real time, ensuring intelligible announcements whenever, wherever.

DANS works to minimise noise pollution from the Public Address system, whilst ensuring the intelligibility of announcements for the intended recipients. If noise levels are high, the broadcast gain is increased – and if they are low, gain is reduced.

How Does It Work?

A DANS01 sensor is located in the listening area, and cabled back to the VIPEDIA-12 returning a live audio feed. When an announcement is made to the DANS-enabled zone, the VIPEDIA-12 compares the audio feed from the sensor in the field with the broadcast message content flowing through the VIPEDIA-12. The VIPEDIA-12 can then remove the ‘announcement’ part from the measured signal, calculate the noise level in the zone, and then adjust the output gain accordingly. Unlike traditional automatic gain control systems, this operates even whilst the broadcasts are being made.


Adjacent Zones

By making it possible to communicate to the VIPEDIA-12 which broadcasts can be ‘heard’, the system makes sure simultaneous broadcasts are ignored; avoiding positive feedback and unnecessarily high sound pressure levels.

Multiple Sensors

VIPEDIA-12 supports up to four sensors in each of four zones – so even large and complex acoustic spaces benefit from DANS.


For more information on the DANS, download some of our datasheets or contact us.