เครื่องเสียง BOSCH LBB 1965/00 Plena Message Manager รับประกัน 1 ปี ของแท้ BOSCH
- Highly flexible stand‑alone digital message player
- Up to 12 messages and 12 trigger inputs
- Downloads messages from a PC in WAV format
- Compliant with standards for emergency sound
systems
- Zone control for Plena system preamplifier
LBB 1925/10
The Plena message manager is a high performance,
highly versatile stand-alone digital message player.
Applications range from spot announcements in
supermarkets and theme parks to warning and
evacuation messages in emergency situations.
Functions
Messages
Up to 12 messages can be stored in the internal
64Mbit EEPROM, without the need for data retention
battery backup. Each message can have any length
within the total available capacity. A PC uploads
messages and configurations via RS-232 to the unit,
which can then operate without a PC. The standard
WAV format is used for messages with sample rates of
8 kHz to 24 kHz with 16-bit word length (linear PCM).
This gives up to 500 seconds of recording time with a
CD‑quality signal-to-noise ratio. The use of linear PCM
instead of a compressed audio format, such as MP3,
ADPCM and u-law/A-law, ensures high-quality playback
of all types of audio signals, including sound effects
and special tones, such as attention chimes.
The unit has 12 contact closure trigger inputs for
announcements. Each can be configured for a
sequence of up to four messages from those available.
In this way messages can be used in combination with
other messages, optimizing flexibility and storage
space usage. When used together with the six-zone
LBB 1925/10 Plena System Pre-Amplifier, a zone
selection can be configured for each trigger input. The
message manager communicates this selection to the
LBB 1925/10 via an RS-232 connection. Continuous
activation of a trigger input causes the corresponding
message sequence to repeat.
Trigger Inputs
The trigger inputs have a serial priority, i.e., input 1
has priority over input 2, input 2 over input 3, etc. The
high priority trigger inputs 1-6 are only accessible as
contacts on the rear panel to prevent accidental use.
The lower priority trigger inputs 7-12 are also available
as trigger switches on the front panel.
Integrity and Dependability
The LBB 1965/00 can also play emergency/evacuation
messages, as it fulfills the IEC 60849 standard. The
microcontroller continually checks the data integrity of
the system, and a watchdog circuit, in turn, checks the
microcontroller. The unit monitors the D/A converter
with a pilot tone, and the high priority trigger inputs
(one to six) for cable short circuits and breaks. A 24 V
battery backup connection with automatic fail-safe
provides continued operation if the mains power
should fail. A 20 kHz pilot tone can be mixed with the
output signal to supervise the link to the next
amplifier. This also works for loudspeaker supervision
