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Speech Transmission Index

Measurement of STIPA in accordance to BS EN IEC 60268-16:2020

Public address (PA) and Voice alarm (VA) systems in building complexes (airports, railway stations, shopping centres and concert halls) are designed to inform members of the public about evacuation directions in case of emergency. However, if such announcements are misunderstood due to the poor quality of the system, this can lead to tragic consequences. Therefore, it is very important to design, install and correctly verify the speech intelligibility of such sound amplification systems. In addition, public announcement systems may have legal or contractual requirements for the level of speech intelligibility, for example in a medical, industrial or commercial environment.

The Speech Transmission Index (STI) is applied in the deterioration of the speech intelligibility induced by the transmission channel. The STI method involves the use of a test signal applied to the transmission channel, and an analysis of the received test signal.

stipa-measurement-wave

BS EN IEC 60268-16:2020

Measurements

The speech transmission quality of the channel is determined and expressed in values from 0 to 1 in the form of STI. Using the obtained STI value, it is possible to determine the potential speech intelligibility.

The applications of STI include evaluation of sound reinforcement and emergency systems, communication channels, speech intelligibility, communication in rooms and auditoria, etc.

STIPA (speech transmission index for public address systems) is a STI derivative approach that was developed for fast measurements of electro-acoustic and acoustic environments effects that affect the speech intelligibility in the room acoustics and/or public address systems.

STIPA calculations are realized by sound level meter in accordance with the BS EN 60268-16:2020 standard. Special smartphone/tablet application “BA Assistant” simplifies the measurement process and generates a report which can be sent to the other device via e-mail, wireless connections or communication applications.

Measurement

Instrumentation

sound level meter uk

Sound Level Meter

Sound level meter meeting class 2 or class 1 specifications of BS EN IEC 61672-1, compliant to BS EN 60268-16.

talkbox-stipa

Talk box

Test signal source (Audio TalkBox) offerring calibrated acoustic sound source emulating the speech levels of a person speaking.

STIPA-meter

STIPA function

Speech can be described as noise that is intensity-modulated by low-frequency signals. The STIPA signal contains such intensity modulations at 14 different modulation frequencies, spread across 7 octave bands.

mobile-app

BA Assistant App

Building Acoustics Assistant App smartphone application guides the user through the sound insulation measurement  as well as STIPA procedures in accordance with choosen standard.

What is a STIPA meter?

For STIPA measurements, it is necessary to use a meter which meets the requirements of the standard for sound level meters in accordance with BS EN IEC 61672-1 with the STIPA functionality that meets the BS EN-60268-16 standard. In organizing STIPA measurements and calculations, the meter is supported by a dedicated mobile application. The STIPA signal is usually reproduced by loudspeakers available in the public information system under study, in some cases dedicated loudspeakers are used.

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Speech Transmission Index

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