Analysis of Speech Intelligibility

The requirement for intelligible speech within internal or external spaces is of great importance. Clear, intelligible speech is critical for emergency address systems, in meeting rooms, lecture theatres, and other critical listening spaces. Conversely, speech privacy (low intelligibility) can sometimes be important in open plan offices and call-centre environments. Koikas Acoustics has the instruments and know-how to address all speech intelligibility requirements.

How can we define speech intelligibility?

Speech intelligibility is commonly assessed objectively in terms of a Speech Transmission Index (STI). The STI provides a direct rating of how intelligible a speech signal is in a specific environment.

Where that environment involves amplified speech via a public address system, the defined intelligibility rating is known as STIPA (Speech Transmission Index Public Address). The STI/STIPA rating range extends from 0 (poor intelligibility) to 1 (excellent intelligibility).

Koikas Acoustics is equipped to measure the STIPA ratings in your environment by using a dedicated measurement system comprising of an NTi Talkbox signal generator and NTi XL2 sound level meter.

Range of services

Whether the room in question is a concert hall. school auditorium, airport, football stadium or train station. Koikas Acoustics has the experience and instruments to ensure that all room acoustical works are undertaken accurately, cost-effectively, and on time.

Ian Sinclair
2 weeks ago

Great service and excellent acoustic report from Koikas Acoustics. James who attended our site was really efficient, professional and friendly. James brought along a variety of premade flooring samples, so we had a lot of confidence in the outcomes, which enabled us to select the correct sound proofing mix to meet our acoustic by-laws. Highly recommended.

Doug Westerway
3 weeks ago

I am a project manager at DMC Building Group. We are a renovation company that works in the Sydney region. We recently engaged Koikas Acoustics to prepare a report for us in relation to a unit renovation at Lindfield to address the concerns of the body corporate. The service from Nick and his team was outstanding and the report was prepared and delivered on time and on budget. We could not be happier with their service. Highly recommended.