Scope
IEC 60268-16:2011
Speech Transmission Index Measurement
This test method provides an objective measure of speech intelligibility in acoustic environments using the Speech Transmission Index (STI) method. STI quantifies how well speech is transmitted through an acoustic space, accounting for noise, reverberation, and frequency distortion. The measurement is critical for evaluating communication effectiveness in public address systems, conference rooms, classrooms, and other speech-critical environments. Venues with high standards for speech clarity use this method to verify system performance and acoustic suitability. ISO 17025 accreditation ensures reliable assessment of speech intelligibility compliance with design standards.
What it measures
- Speech Transmission Index (STI) value (0-1 scale)
- Modulation transfer function across frequency bands
- Speech intelligibility rating and quality assessment
- Impact of noise and reverberation on speech clarity
- Communication effectiveness and auditory conditions
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DIN EN ISO 3382-2
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BS EN ISO 3382-2
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NF EN ISO 3382-2
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UNI EN ISO 3382-2
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UNE EN ISO 3382-2
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NEN EN ISO 3382-2
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DIN EN ISO 1996-2
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BS EN ISO 1996-2
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NF EN ISO 1996-2
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UNI EN ISO 1996-2
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UNE EN ISO 1996-2
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NEN EN ISO 1996-2
1,670
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18
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Showing 176–200 of 1,670 labs
DIN 52186
ISO 21527-1
DIN EN ISO 527-3
IEC 61924-2
DIN EN 62233
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BIOQUALITA' SRL
Active
0,2 0,003 bis 0,006
(HLA DQ8 (HLA DQB*03:02)
ISO 18787
BS EN 15662
DIN EN ISO 6888-1
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BIOTECNAL
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UNE-EN ISO 6579-1
UNE-EN ISO 6222
UNE-EN 26777
UNE-EN ISO 7027-1
en 31-7-79 (BOE 29-08-79)
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BLASY + MADER Gesellschaft
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ISO 10381-8
DIN ISO 10381-1
DIN ISO 10381-2
DIN ISO 10381-3
DIN ISO 10381-4
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BP Europa SE Aral Forschung
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DIN EN ISO 6246
DIN 53160-1
DIN EN ISO 22854
(LBLS) (OMIM 611105) (c.228-
DIN EN 13016-1
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BS EN ISO 10140-2:2021
BS EN ISO 10140-3:2021
BS EN ISO 717-2:2020
ISO 7171
BS EN ISO140-3:1995 (withdrawn)
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DIN EN ISO 7730
ISO 5667-5
ISO 17604
DIN EN ISO 6888-1
ISO 8573-4
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BSI á Íslandi ehf
Active
Nominal value
TEMPERATURE
See Notes 1 to 3
TORQUE
Case Manager: BC4
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UNE-EN 13284-2
UNE-EN 15259
UNE-EN 16911-2
UNE-EN 13284-1
UNE EN 1911
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Babcock Marine [Rosyth]
Active
(HSG 248) – 2021
14B based on HSG 248
DIN EN 12021
14A based on HSG 248
(PCM) based on HSG 248
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Balis Micro
Active
AM09 based on BS ISO 21527-1:
DIN EN ISO 21528-2
DIN EN ISO 4833-2
BS ISO 15214:1998
0.95) based on BS ISO 21527-2:2008
Bareiss Prüfgerätebau
Active
Sound intensity — scanning method (ISO 9
Messgeräte für die
Härteskale Shore A*
Analoge Anzeige
Railway freight wagon brake system requi
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Bax Engineering
Active
Temperaturanzeigegeräte
–100 °C bis
- Direktanzeigende Thermometer
- Thermopaare, Thermoelemente
verwendete Abkürzungen:
Salmonella spp.
Antikörper)
Treponema pallidum (Lues)
Thrombozytäre Antikörper
dysenteriae), Vibrio cholerae
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Echinococcus granulosus
Echinococcus multilocularis
Paragonimus uterobilateralis
Ascaris lumbricoides (IgG)
Brucella spp. (IgG, IgM)
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Hämoglobin
Differentialblutbild
Erythrozyten
Großes Blutbild
Kleines Blutbild
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Okkultes Blut
Großes Blutbild
Kleines Blutbild
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Thrombozyten
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2C-B
2C-I
3-Hydroxy-Bromazepam
5-Hydroxyindolessigsäure
6-Acetylcodein
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Zelldifferenzierung
Erythrozyten
Großes Blutbild
Hämoglobin
Kleines Blutbild
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Hämoglobin (immunologisch)
CA 125
CA 15-3
CA 19-9
CA 72-4
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Hämoglobin
Natriumchlorid
Kalium
Natrium
Eiweißelektrophorese: Albumin, Alpha-1-G
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10-OH-Carbazepin
11-Deoxycortisol
17-OH-Progesteron
21-Deoxycortisol
25-OH Vitamin D2
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Thrombozytenfunktion
5-Hydroxyindolessigsäure
Adrenalin
Amiodaron, Desmethylamiodaron
Carbohydrate-deficient
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