Public address system and method

摘要

The present invention relates to a public address system comprising a first (1) and a second (1') amplifier module, each comprising an amplification means (2,2') and arranged for receiving a given signal to be applied to said amplification means and for outputting an amplified signal. The first and second amplifier module are interconnected via a first (LS1) and second (LS2) branch. At least the first or the second branch comprises at least one loudspeaker (11,11'). The first branch is arranged for feeding the amplified signal of the first amplifier module to the second amplifier module and the second branch is arranged for feeding the amplified signal of said second amplifier module to said first amplifier module. The first and second amplifier module further each comprise measuring means for performing comparisons on pairs of signals selected from the received given signal, the amplified signal output by the amplification means comprised in the amplifier module and the amplified signal of the other amplifier module and fed via the first or said second branch, and for yielding, based on those comparisons, an indication of the public address system's operational status.