Bosch Praesideo 4.0 User Manual download pdf (Page 68)

Praesideo 4.0

en | 78

Bosch Security Systems B.V.

IUI-PRAESIDEO_4.0 | V1.0 | 2013.01

Installation and User Instructions

figure 1: VACIE frequency response limits without

microphone(s)

Key

1 - relative output signal level, with reference to 0 dB

signal level measured at 1 kHz (dB)

2 - 1/3 octave frequency band (Hz)

figure 2: VACIE frequency response limits with

microphone(s)

Key

1 - relative output signal level, with reference to 0 dB

signal level measured at 1 kHz (dB)

2 - 1/3 octave frequency band (Hz)

The frequency response of all Praesideo sound paths

that do not include microphones is within the specified

limits of this clause, with the following remarks for the

LBB4428/00.

The frequency response of the LBB4428/00 power

amplifier shows some interaction with the attached load

impedance. For certain load conditions this causes a

resonance peak around 10-20 kHz, just exceeding the

+1 dB limit in the frequency band between 6 and 8kHz.

The installer shall use the built-in parametric equalizer of

this amplifier to flatten the frequency response of each

channel by activating the high frequency shelving filter,

with gain setting -2 dB at a corner frequency of 6.8 kHz.

This setting is valid for all rated load conditions.

A high pass filter at 68 Hz in the equalizer section is

enabled by default to decrease the risk of loudspeaker

transformer saturation for high level low frequency

signals. The high pass filter must remain enabled.

The frequency response of all Praesideo sound paths

that include microphones is within the specified limits of

this clause.

NOTE - The frequency response limits exclude

loudspeakers.

NOTE - A bandwidth of 400 Hz to 4 kHz is sufficient to

achieve acceptable intelligibility in some acoustic

environments. However, a higher frequency limit may be

necessary to achieve acceptable intelligibility in more

difficult acoustic environments due, for example, to the

masking effect caused by reverberation and/or ambient

noise.

13.13 Message store(s) Praesideo is compliant.

Pre-recorded messages shall be stored in non-volatile

memory that retains the messages when all power

sources are removed.

The pre-recorded messages of the Praesideo system

are digitally stored on a Compact Flash card in

uncompressed format (linear PCM, 16-bit, 44.1kHz).

This card retains the messages when all power sources

are removed.

NOTE - The use of tapes or magnetic or optical data

disks for the storage of emergency messages is not

acceptable at the time of drafting this European Standard

(see Annex C)

Clause / Requirement Compliance Signature

4,0 8,0 20

-10

0,4

-20

-15

-1

0,125

1,0

4,0 10

-10

0,5

-20

-15

-5

0,2

1,0

0,63

0,8

1,6

1,25

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