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
🇩🇪 DIN EN ISO 3382-2 🇬🇧 BS EN ISO 3382-2 🇫🇷 NF EN ISO 3382-2 🇮🇹 UNI EN ISO 3382-2 🇪🇸 UNE EN ISO 3382-2 🇳🇱 NEN EN ISO 3382-2 🇩🇪 DIN EN ISO 1996-2 🇬🇧 BS EN ISO 1996-2 🇫🇷 NF EN ISO 1996-2 🇮🇹 UNI EN ISO 1996-2 🇪🇸 UNE EN ISO 1996-2 🇳🇱 NEN EN ISO 1996-2
1,670 Accredited labs
18 Countries

Showing 301–325 of 834 labs

LADR GmbH MVZ Nord-West Zweigpraxis Leer

Active
DAkkS D-ML-13087-02-00 Leer, DE
HbA1c Basophile Eosinophile Erythrozyten Hämatokrit + 3 more
View Profile

LADR GmbH Medizinisches Versorgungszentrum Baden-Baden

Active
DAkkS D-ML-17171-01-01 Baden-Baden, DE
HbA1c HCG qualitativ Erythrozyten Granulozyten basophil Granulozyten eosinophil + 3 more
View Profile

LADR GmbH Medizinisches Versorgungszentrum Braunschweig

Active
DAkkS D-ML-20249-01-00 Braunschweig, DE
HbA1c Retikulozyten Leukozyten Kleines Blutbild Großes Blutbild = + 3 more
View Profile

LADR GmbH Medizinisches Versorgungszentrum Bremen

Active
DAkkS D-ML-13183-01-00 Bremen, DE
HbA1c Zellzahl Blutbild groß Blutbild klein Retikulozyten + 3 more
View Profile

LADR GmbH Medizinisches Versorgungszentrum Kramer und Kollegen

Active
DAkkS D-ML-13107-01-00 Geesthacht, DE
Thrombozytenfunktionstest 2-Desoxypipradol (2-DPMP) 2-oxo-3-hydroxy-LSD 3.4-DMMC 3-Fluormethcathinon + 3 more
View Profile

LADR GmbH Medizinisches Versorgungszentrum Hannover

Active
DAkkS D-ML-13109-01-01 Hannover, DE
HbA1c Basophile Granulozyten Eosinophile Granulozyten Erythrozyten Hämatokrit + 3 more
View Profile

LADR GmbH Medizinisches Versorgungszentrum Neuruppin

Active
DAkkS D-ML-13319-02-01 Neuruppin, DE
Liste aller Untersuchungsverfahren Webpräsenz des Medizinischen Laboratoriu HbA1c Basophile Eosinophile + 3 more
View Profile

LADR GmbH Medizinisches Versorgungszentrum Nord

Active
DAkkS D-ML-13132-01-00 Flintbek, DE
HbA1c Retikulozyten Leukozyten Neutrophile Granulozyten Lymphozyten + 3 more
View Profile

LADR MVZ Recklinghausen e

Active
DAkkS D-ML-13194-01-01 Recklinghausen, DE
Blutsenkung Benzol Ethylbenzol Aceton, Isopropanol, Methanol Ethanol + 3 more
View Profile

LADR Medizinisches Versorgungszentrum Dres. Bachg, Haselhorst & Kollegen Recklinghausen

Active
DAkkS D-ML-13194-01-00 Recklinghausen, DE
Blutsenkung Benzol Ethanol Ethylbenzol Aceton, Isopropanol, Methanol + 3 more
View Profile

LDH Kalibrierservice

Active
DAkkS D-K-18673-01-01 Dresden, DE
Gleichspannung 1 mV bis 10 mV Messgeräte > 10 mV bis 100 mV > 100 mV bis 220 mV > 220 mV bis 2,2 V > 2,2 V bis 11 V + 3 more
View Profile

LGA Immissions- und Arbeitsschutz

Active
DAkkS D-PL-17126-01-00 Nürnberg, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN 45645-2 DIN ISO 12884 + 3 more
View Profile

Labor 28 MVZ

Active
DAkkS D-ML-17085-01-00 Berlin, DE
Thrombozytenfunktionstest 5-Hydroxyindolessigsäure Amiodaron, Desethylamiodaron Tricyclische Antidepressiva Kohlenhydratdefizientes + 3 more
View Profile

Labor Augsburg MVZ

Active
DAkkS D-ML-19783-03-00 Augsburg, DE
Thrombozytenaggregation a-Hexachlorcyclohexan 2-Butanon Aceton Benzol + 3 more
View Profile

Labor Becker MVZ e

Active
DAkkS D-ML-13272-01-00 München, DE
Drogenscreening-Qualitativer Anti-HCV-Bestätigungstest Benzodiazepine, Kokain, Opiate, Buprenor Organische Säuren Neuroleptika, Antidepressiva + 3 more
View Profile

Labor Berlin - Charité Vivantes

Active
DAkkS D-ML-13440-03-01 Berlin, DE
Thrombozytenaggregation (ADP, ASPI, TRAP) Oligosaccharide Aceton Ethanol + 3 more
View Profile

Labor Berlin - Charité Vivantes Services

Active
DAkkS D-ML-19677-01-01 Berlin, DE
Thrombozytenaggregation (ADP, ASPI, TRAP) Oligosaccharide Aceton Ethanol + 3 more
View Profile

Labor Brunner, Labormedizinisches Versorgungszentrum Konstanz

Active
DAkkS D-ML-13333-01-00 Konstanz, DE
Ampicillin Cefepim Ceftazidim HbA1c Katecholamine + 3 more
View Profile

Labor Fenner und Kollegen Medizinisches Versorgungszentrum für Labormedizin und Humangenetik

Active
DAkkS D-ML-19241-01-00 Hamburg, DE
qualitative Bestimmung von Antidepressiva, Cocain, Designerdrogen u Mitogenen, Medikamenten 5-Hydroxyindolessigsäure HbA1c + 3 more
View Profile

Labor Heidrich & Kollegen MVZ

Active
DAkkS D-ML-13201-03-01 Hamburg, DE
Thrombozytenfunktion Cyclosporin A Everolimus Lacosamid Lamotrigin + 3 more
View Profile

Labor Krause & Kollegen MVZ

Active
DAkkS D-ML-18018-01-00 Kiel, DE
10-Hydroxy-Carbamazepin 9-Hydroxyrisperidon Amiodaron, Desmethylamiodaron Amisulprid Aripiprazol + 3 more
View Profile

Labor Spranger

Active
DAkkS D-ML-13363-01-00 Ingolstadt, DE
hCG (qualitativ) Freie Fettsäuren gamma-Linolensäure, Arachidonsäure (AA) Katecholamine VMS, 5-HIES, HVS + 3 more
View Profile

Labor von Froreich

Active
DAkkS D-ML-13298-01-01 Hamburg, DE
10-OH-Oxcarbazepin Antiepileptika: Berechnung Medikamente Carbamazepin-epoxid Cyclosporin A + 3 more
View Profile

Labor Hannover MVZ

Active
DAkkS D-ML-19669-01-00 Hannover, DE
Differentialblutbild Automat Eosinophile, Basophile, Normoblasten, so Hämoglobin Natriumchlorid Glucose + 3 more
View Profile

Labor Lübeck MVZ

Active
DAkkS D-ML-18419-01-00 Lübeck, DE
HbA1c Adrenalin Dopamin Noradrenalin Vanilinmandelsäure + 3 more
View Profile

No matching labs found.

Industries

Audio and sound system design Public address and emergency systems Telecommunications and broadcasting Educational and institutional facilities Aviation and maritime communication

Related Standards

  • ISO 3382-2 Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms
  • ISO 1996-2 Acoustics - Description, measurement and assessment of environmental noise - Part 2: Determination of sound pressure levels
  • EN 60268-1 Sound system equipment - Part 1: General

Other Test Methods

0 labs selected
Compare