138
en | LCD call station | PRA-CSLD, PRA-CSLW
PRAESENSA
2019.11 | V1.00 |
Installation manual
Bosch Security Systems B.V.
12.5.6
Call station microphone frequency response
PRA-CSLW (Hand‑held)
The typical frequency response of the PRA-CSLW call station microphone is shown in the next
diagram (black), together with the boundaries according to EN
54‑16, clause 13.12.3 (red).
The frequency response has been measured at a distance of 10
cm (4
in) with 1/6
th
octave
smoothing. It rolls off rapidly below 1
kHz to cancel environmental noise. But this might result
in a lack of body of the voice sound.
In environments that are not extremely noisy, the sound can be improved by applying
parametric equalization on this call station, lifting the frequency band between 300
Hz and
1
kHz as shown in the next diagram. This makes the frequency response more flat between
300
Hz and 6
kHz. A low‑cut filter below 300
Hz helps to improve speech intelligibility. See the
PRAESENSA configuration manual for details on how to get to the audio options in the
configuration.
PRA-CSLD
The typical frequency response of the PRA-CSLD call station microphone is shown in the next
diagram (black), together with the boundaries according to EN
54‑16, clause 13.12.3 (red).
The frequency response has been measured at a distance of 20
cm (8
in) with 1/6
th
octave
smoothing.
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