XL2

2 3 4 STI – 7 STI 9 10 STI 14 15 17 18 STI? 20 Modulation Transfer Function (MTF) 23
STI - Speech Transmission Index 24
RASTI - Room Acoustics Speech Transmission Index 25
STIPA - Speech Transmission Index for Public Address 26
XL2
STI XL2IEC 60268-16:2011 (edition 4) STISTIPA STIPA STI
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XL215 STISpeech Transmission IndexCIS (Common Ineligibility Scale)
IEC 60268-16:2011 (edition 4) edition23
• SN • • • • • • •
XL2STIPA STIPA My NTI Audiohttps://my.nti-audio.com
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CEN/TS 54-32 Fire detection and fire alarm systems
ISO 7240 Fire detection and alarm systems, section 16 & 19
IEC 60268-16 Objective rating of speech intelligibility by speech transmission index
EN 50849 Sound systems for Emergency purposes

AS 1670.4 Australia: Fire detection, warning, control and in-
tercom systems NFPA 72 US: National Fire Alarm Code (2010 edition) BS 5839-8 Great Britain: Fire detection and alarm systems
for buildings. Code of practice for the design, in- stallation and servicing of voice alarm systems
VDE 0828-1 Germany: Electroacoustic Emergency Systems with application regulation described in standard DIN VDE 0833-4
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TalkBox
Minirator
MR-PRO
MR-PRO
CD Player NTi Audio CD STIPA V1.1 CD STIPA
STIPA
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• • • •
TalkBox • TalkBox
NTi Audio TalkBox
• MiniratorSTIPA • LAeq + 3 dB
• XL2STI
• NTi AudioXL2 • XL2
STIPA
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15STIPA FINISHED • STIPA • Enter SDASCII

STI
A+ > 0.76 A 0.72 - 0.76 B 0.68 - 0.72 C 0.64 - 0.68 D 0.60 - 0.64 E 0.56 - 0.60 F 0.52 - 0.56
G 0.48 - 0.52 H 0.44 - 0.48 I 0.40 - 0.44 J 0.36 - 0.40 U < 0.36
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• Avr • START NEW Enter

XL2STIPA
• Finish
STIPA
STIPA
SN15 dB
• • STIPA
STIPA XL2
XL2 PCNTi AudioSTI STIPA STIPA
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XL2
-
-
- Enter
STI
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Offices
Public Areas 50 - 64
Restaurants
- bowling 78 - 85
Airport
- gates 54 - 64
Aisles
Bus station
Courtrooms 40 - 50
- sleeping room, TV off 28 - 35
- sleeping room, TV on 60 - 70
Libraries
- reception 50 - 60
• CEN/TS 54-32:2015
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Area [m2] Minimum number of measurement points
< 25 1 25 - 100 3
100 - 500 6 500 - 1500 10
1500 - 2500 15 > 2500 15 per / 2500 m2
• 12 m • • 1/3 • 1.2 m1.6 m
•
• 0.03
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7080dBSPL 70 dBSPL1STI0.7
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STI STI STI>0.2 STIPA STIPA NFPAcode
STI • 011 0.5 0.45
• STIPA0.03 0.03
• STIPA
24365STIPA STIPA • NTi Audio XL2
•
• XL2ASD
• VDE 08336 x 6 m12 x 12 m 12 x 12 m
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CD CDSTIPA STIPASTIPA (+/-20ppm) CD 1kHzCD • NTi Audio CDCD1 kHz 1
• CDXL2RMS/THD+N 0.99998kHz1.00002 kHz
STIPA XL2NTi Audio STIPA CD V1.1

www.nti-audio.com IEC60268-16 (2011. edition 4.0)
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1: STI (Speech Transmission Index)CIS (Com- mon Intelligibility Scale)



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5
MTF
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STI - Speech Transmission Index
7: STI1498
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IEC60268-16, edition 4.0, 2011RASTI RASTI STI STI RASTIRASTI RASTIMTF STIRASTI RASTI RASTI 500 Hz2 kHz45
RASTI9
RASTI BOSEPA STIPA
STIPAfull STI
IEC60268-16:2003STIPA125Hz 250Hz
IEC60268-16:2003STIPA (2011)
NTi Audio STIPAIEC60268-16:2011
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mr1.00
STIPA% Alcons
STIPA