Audio

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Public Address Systems

Variodyn - a fully digital public address paging system by av digital. background infos and useful notations to the pa protocol used for communication by this system.
Präsidio - a fully digital public address paging system by bosch.
table: comparision of functions
Variodyn D1 Praesidio Ateis Dynacord
system complexity
modules 9  ?  ?  ?
technology digital control
digital audio
digital control
digital audio
digital control
digital audio
digital control
analog audio
basic public address functions
monitoring yes  ?  ?  ?
autonomous generated signals yes  ?  ?  ?
autonomous audio storage yes  ?  ?  ?
sinal processing yes  ?  ?  ?
environmental noise compensation yes  ?  ?  ?
multiple connections yes  ?  ?  ?
connection priority yes  ?  ?  ?
connection conflict management yes  ?  ?  ?
connect group of lines yes  ?  ?  ?
remote administration yes  ?  ?  ?
configuration configuration tool, telnet  ?  ?  ?
alarm mode yes  ?  ?  ?
power amplifier replacement yes  ?  ?  ?
loudspeaker line survey yes  ?  ?  ?
power amplifier survey yes  ?  ?  ?
earthfault survey yes  ?  ?  ?
networking yes  ?  ?  ?
time scheduling of connections yes  ?  ?  ?
time synchronization yes  ?  ?  ?

external links

Advanced Linux Sound Architecture - ALSA
Sound and Music file formats a great collection of file format descriptions