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.
摘要:
The present invention relates to a method for communicating over a voice communication system operable over a digital communication network control information related to a component of the voice communication system, said control information at least comprising routing information, the method comprising the steps of - sending to at least one destination audio data packets (10) over the digital communication network, at least one of the audio data packets comprising a header, a payload (11) and a data field (12) comprising at least a part of the control information comprising said routing information, - receiving at the at least one destination the at least one of the audio data packets comprising the header, the payload and the data field, - analysing said at least part of the control information and performing at least a routing action on the component of the voice communication system based on the control information in the data field.
摘要:
The invention pertains to a communication system for use in a railway vehicle, comprising: a first communication network (10) and a second communication network (20), the communication networks (10, 20) using physically separate communication media; and a plurality of communication terminals (100, 200), each connected to both communication networks (10, 20). The communication system is adapted to prioritise communications from the communication terminals (100, 200) over the communication networks (10, 20) according to at least two levels of service. A first communication terminal (100) comprises a first functional module (110) and a second functional module (120), the functional module (110, 120) being functionally equivalent, the first functional module (110) being adapted to interface with the first communication network (10) and the second functional module (120) being adapted to interface with the second communication network (20). The functional modules (110, 120) are configured to be simultaneously operational.