The 'Automatic Volume Control' (AVC) function is used to supervise the ambient noise of an area and increase the volume of the speaker line in case that the ambient noise is higher than the predefined value, such as on train stations, in airports and in shopping malls.

The AVC function is required as a way of adjusting the sound level of the audio signal to suit the current situation in the event of huge fluctuations in background noise. This ensures that the wanted signal is always louder than any background noise so that it will be possible to understand what is being said and on the other hand, announcements will not be too loud for people in quiet buildings.

Automatic volume control module PCA2008-A1

The automatic volume control module PCA2008-A1 receives the audio level of the measuring microphones PCA2007-A1. The PCA2008-A1 uses the received audio levels to calculate the average, which is then forwarded to the connected digital audio matrix for further processing. The input sensitivity can be set to line level or microphone level.

It is possible to connect up to four PCA2007-A1 to one PCA2008-A1. The connected microphone wiring is monitored for short circuits, interruptions and earth faults. Inactive lines can be excluded via jumper. A fault is reported with the fault indication relay.

The PCA2008-A1 was specifically developed for use with the digital audio matrices PC2001-A1, PC2003-A1 and PC2005-A1.

Automatic volume control microphone PCA2007-A1

The AVC microphone PCA2007-A1 is a measuring microphone that was specifically developed for use with the digital audio matrices PC2001-A1, PC2003-A1 and PC2005-A1. It constantly records the levels in the surrounding area within a set frequency range and transmits the value to the receiver assembly PCA2008-A1 for further processing.

The output level can be set to line level or microphone level.