Inter-M PAC-5000 - Manual (Page 7)

DIGITAL PA COMBINATION SYSTEM
5 PAC-5000
- EMERGENCY POWER AND BATTERY CHARGING
The system provides the battery connecting terminal and the battery charging function to supply the
emergency power.
- FIRE DETECTION AND EMERGENCY BROADCASTING
The system provides 24 channel sensor input terminals for automatic fire alarm broadcasting. It also
provides the recording function of fire alarm message for fire alarm broadcasting.
- CHIME & SIREN
It has 2 kinds of chimes and sirens which are available to give a public announcement or in an emergency condition.
- MIC/LINE LEVEL SELECT SWITCH
The system provides MIC/LINE level select switch so that you can easily select the input as MIC or LINE.
- EM MIC
The system provides the EM MIC which is installed on the front panel. It is easy to use the EM MIC for fire
alarm broadcasting.
- ANTI SHOCK SYSTEM
The CD mechanism has anti-shock function so that it is quite strong against any shock.
- MP3/WMA
The CD player can playback CD-DA, MP3 or WMA.
- INSTALL A RACK
Using the additional rack brackets, the system can be installed in a rack.
Additional Descriptions Additional Descriptions
• MP3 (MPEG Audio Layer-3)
MP3 is one of music file formats that can contain music with stereo sound quality as good as audio CD,
which is a type of MPEG as audio, video compression standards. Compression rate is 1Mb by 1 minute
and thus about 3~ 5 minutes are sufficient if recording songs of 3~ 5 min or so. Differently from audio CD,
a music file made of MP3 can contain over 130 songs for popular songs or folk songs and playing time is
also about 10 hours. MP3 clears frequency range for a human being not to discernable and so has
advantage to compact it to 1/12 or so while maintaining music as sound quality equivalent to CD level. For
example, deriving a song in a music CD while maintaining music as sound quality equivalent to CD level
becomes capacity of 50MB or so but if compressing and converting it to a MP3, size of the MP3 largely
reduces to 4~5MB.
• WMA (Windows Media Audio)
WMA is a multimedia compression method developed by Microsoft Corporation and is technology to
compress only music from 'Window Media Technologies', and provides same sound quality as format of
MP3 up to 128Kbps, which has lower 64Kbps format than MP3.
In other words, it has a file size of the half of the MP3 and provides same sound quality as MP3.
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