Newsletter - March 2014
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Calculation of Speech Transmission Index in Rooms

Sufficient acoustic quality of speech communication is very important in many different situations and places. The most known available objective method for measurement and prediction of speech intelligibility is the Speech Transmission Index (STI), described in the international standards IEC 60268-16 and ISO 9921. A new application note on how to perform correct predictions in ODEON is available on the Application Notes page.

Two cases of speech transmission index are discussed: Direct communication between two people in the same environment and public address (PA) systems where an electro-acoustic system is used to address a group of people.  

A high signal to noise ratio (SNR) improves STI but the obtainable value may be limited by Sound Pressure Level design criteria. An example of calculation is shown below where the STI from a PA voice alarm system is simulated . In this case the STI should be at least 0.35 in the area where people have access, but at the same time a 1 KHz alarm tone should remain below 115 dB.

 Read the whole application note here.


17-18 March 2014: Two-day ODEON course at the Odeon A/S facilities, SCION DTU, Kgs Lyngby, Denmark. For more information and for downloading the program click hereThe course is now fully booked. We thank you all for your interest! 

12-13 May 2014: For those who wish to register, we have scheduled an extra two-day ODEON course at the Odeon A/S facilities. If you like to participate please send an email to sales@odeon.dk.


In November Professor Jens Holger Rindel attended the Acoustics 2013 conference at New Delhi, India where he gave a key-note presentation on "Simulations, measurements and auralisations in architectural acoustics. In this presentation examples of simulations and measurements where given for an auditorium at the Technical University of Denmark.

Acoustics 2013 New Delhi

In March Jens Holger Rindel will also participate at the Daga Conference 2014 in Oldenburg, Germany. You can visit Jens Holger at our Odeon booth No. 15.

In April Odeon A/S director, Claus Lynge Christensen, will join the EAA Joint Symposium on Auralization and Ambisonics 2014 in Berlin, Germany.

New Video Tutorials and New Application Notes

The Get Started page is constantly updated with additional tutorials that help you learn working with ODEON very fast. The section includes short videos on how to setup a model and perform basic calculations.

On the Application Notes page we upload more guides on different topics. This time you can find instructions on how to calibrate your measuring system in a diffuse field for sound strength and STI measurements as well as how to perform simulations for STI.

New Publications 

Simulations, Measurements and Auralisations in Architectural Acoustics. Jens Holger Rindel, Claus Lynge Christensen and George Koutsouris. Acoustics 2013, New Delhi, India. 2013.

In this newsletter

-Speech Transmission Index in Rooms



-New Video Tutorials

-New Publications

ODEON version 12.15

Free demo version

SU2Odeon version 1.07
March 10-13
Daga Conference Oldenburg
March 17-18
ODEON Course

Kgs. Lyngby

April 03-05
EAA Symposium 

Berlin Germany

May 12-13

ODEON Course Kgs. Lyngby

July 13-17

ICSV 21 Conference

Beijing China

September 07-12
Forum Acusticum

Krakow Poland

November 16-19
Internoise 2014

Melbourne Australia

Full event calendar
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