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
1,868 Accredited labs
20 Countries

Showing 1,626–1,650 of 1,868 labs

DAkkS D-ML-13154-02-00 Aachen, DE
Syndrom/Silver-Russell-Syndrom) SMN1 (SMA) FMR1-Gen (fraX, POF, FXTAS) Charcot-Marie-Tooth-Erkrankung Cardiolipin (CMT) + 3 more
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DAkkS D-ML-13154-03-00 Aachen, DE
Adrenalin Dopamin 5-Hydroxyindolessigsäure Homovanillinsäure Noradrenalin + 3 more
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DAkkS D-ML-13154-02-01 Aachen, DE
(Long Read): SNV, CNV, Repeats FMR1-Gen (fraX, POF, FXTAS) Charcot-Marie-Tooth-Erkrankung Cardiolipin (CMT) GARS1, GDAP1, GJB1, HSPB1, IGHMBP2, LITA + 3 more
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DAkkS D-ML-13154-01-01 Aachen, DE
Leukozyten (WBC) Erythrozyten (RBC) Hämatokrit (HCT) MCV Thrombozyten + 3 more
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DAkkS D-ML-13125-01-00 Bonn, DE
Thrombozytenaggregation Agonisten: ADP, ADP-PGE1, heparininduzierter Antikörper Heparin induzierter Thrombozytopenie Typ II (HIT II) + 3 more
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DAkkS D-ML-13125-03-01 Bonn, DE
Bannayan-Ruvalcaba-Riley-Syndrom (institutseigene Erweiterung des Illumina TruSight Cancer Panel): PTEN, AKT1, PIK3CA, SEC23B Syndrom (institutseigene + 3 more
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DAkkS D-ML-13125-02-00 Bonn, DE
Amiodaron, Desethylamiodaron HbA1c Vitamin A, Vitamin E Vitamin B1/B6 Vitamin B2 + 3 more
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DAkkS D-ML-19730-02-00 Dresden, DE
angeborener Chromosomensatz Nummerische Veränderungen Chromosomen 13, 18, 21, X und ldentifizierung kleinster chromosomaler/numerischer + 3 more
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DAkkS D-ML-19730-07-00 Dresden, DE
Brucella, Antikörper Candida, Antikörper Entamoeba histolytica, Antikörper Leptospiren, Antikörper Schistosoma, Antikörper + 3 more
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DAkkS D-ML-19730-01-00 Dresden, DE
Multiplate-Analyse (TRAP, ADP) Thrombozytenaggregation Born) Organische Säuren (Profil) Metanephrin, Normetanephrin + 3 more
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DAkkS D-ML-19730-06-00 Dresden, DE
Blutbild, Differentialblutbild Differentialblutbild Fragmentozyten Knochenmarkzytologie Liquor- und Ergusszytologie + 3 more
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DAkkS D-ML-13362-05-00 Düsseldorf, DE
Familiärer Brust- und Eierstockkrebs (TruRiskGenePanel des Deutschen Konsortiums Familiärer Brust- und Eierstockkrebs) (ATM, BARD1, BRCA1, BRCA2, BRIP1, CDH1, + 1 more
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DAkkS D-ML-13362-04-00 Düsseldorf, DE
Cyclosporin Everolimus Sirolimus Cyclosporin A, Everolimus, Sirolimus, Ta Vitamin A + 3 more
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DAkkS D-ML-13362-01-01 Düsseldorf, DE
Pilze (Dermatophyten, Schimmelpilze, Spr Mykobakterien anaerobe Bakterien, anspruchsvolle Schnellwachsende aerobe Cefinase-positive Bakterien + 3 more
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DAkkS D-ML-13297-07-01 Erlangen, DE
Azoospermie (AZFa,b, c Deletionen) Huntington (HTT) Fra(X)-Syndrom, FXTAS (FMR1) Familiärer Brust- und Eierstockkrebs (ATM (NM_000051), BRCA1 + 3 more
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DAkkS D-ML-13297-06-00 Erlangen, DE
Thrombozytenaggregation ASPI, COL, RISTO, TRAP) Steroide Profil 11-Deoxycortisol 11-Deoxycorticosteron + 3 more
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DAkkS D-ML-13297-08-00 Erlangen, DE
Interleukin 23 Rezeptor HLA-B27 HLA-A-Locus HLA-B-Locus HLA-C-Locus + 3 more
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DAkkS D-ML-13297-02-00 Erlangen, DE
Amitriptylin Bromazepam Chlordiazepoxid Clobazam Clomipramin + 3 more
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DAkkS D-ML-13297-03-00 Erlangen, DE
Aspergillus fumigatus AK Brucella spp.- Ak Candida spp. - Ak Cardiolipin AK Cryptococcus neoformans + 3 more
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DAkkS D-ML-13297-01-00 Erlangen, DE
maschinelles Blutbild maschinelles Differentialblutbild DRVVT, Lupus Antikoagulantien Protein S (Aktivität) Exogene Gerinnungsfaktoren + 3 more
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DAkkS D-ML-13297-04-00 Erlangen, DE
Mycoplasma pneumoniae-DNA Bordetella pertussis- DNA Legionella pneumophila-DNA HIV-1, 2, Ak, Bestätigungstest Adenovirus IgA-Ak + 3 more
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DAkkS D-ML-13297-05-00 Erlangen, DE
5-Hydroxyindolessigsäure HbA1c Katecholamine Metanephrine, Normetanephrine Serotonin + 3 more
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DAkkS D-ML-18383-03-00 Essen, DE
Candida dubliensis -Ag Cardiolipin AK Clostridioides difficile AG Cryptococcus neoformans Echinococcus-Ak + 3 more
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DAkkS D-ML-18383-05-01 Essen, DE
Einordnung und Charakterisierung Minimale Resterkrankung myeloischen Leukämien monoklonale Gammopathien PNH-Diagnostik + 3 more
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DAkkS D-ML-18383-04-01 Essen, DE
Gendosisanalyse Gendosisanalyse (BE3A, SHOX ) Genet. Veränderung bei Tumorerkrankung: Analyse auf Verlust eines Chromosoms 3 + 3 more
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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

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