IEC 60268 16 PDF

Speech Intelligibility STIPA Speech Intelligibility STI Spoken announcements in public areas like classrooms, conference halls, shopping malls, stadiums, train stations, airports, concert halls, or similar locations should be well understandable to the audience. Particularly, it is critical to clearly inform persons in danger about escape information and directions in case of an emergency. It is therefore essential to verify the speech intelligibility in these places by using a reproducible and accurate method. Speech Transmission Index STI is the most acknowledged standardized parameter for assessing the intelligibility of a spoken message. At a glance Analysis of speech intelligibility STI Measurement procedure Standardized reporting of the results Basics Speech intelligibility is measured by reproducing a known signal the STIPA test signal and measuring the quality of that signal as it reaches each of the measurement positions.

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Speech Intelligibility STIPA Speech Intelligibility STI Spoken announcements in public areas like classrooms, conference halls, shopping malls, stadiums, train stations, airports, concert halls, or similar locations should be well understandable to the audience. Particularly, it is critical to clearly inform persons in danger about escape information and directions in case of an emergency. It is therefore essential to verify the speech intelligibility in these places by using a reproducible and accurate method.

Speech Transmission Index STI is the most acknowledged standardized parameter for assessing the intelligibility of a spoken message. At a glance Analysis of speech intelligibility STI Measurement procedure Standardized reporting of the results Basics Speech intelligibility is measured by reproducing a known signal the STIPA test signal and measuring the quality of that signal as it reaches each of the measurement positions.

The IEC standard for STI defines how any degradation in the signal is measured and the intelligibility result displayed as a single number from 0 unintelligible to 1 excellent intelligibility. Factors that influence the intelligibility of speech sound pressure level speech must be loud enough, but not too loud ambient noise level e.

Rooms without Audio Systems In locations such as classrooms, where no PA system is installed, the STIPA test signal should be reproduced by an appropriate loudspeaker at the position and with the typical sound pressure level of the speaker the teacher. Requirements for such a loudspeaker are defined in the IEC standard, which states that the typical level of a human talker corresponds to 60 dBA 1 m distance.

The Talkbox acoustic signal generator with built-in loudspeaker is designed for this application. Audio Systems with Voice Microphones In locations where the announcement is picked up by a voice microphone, and then broadcast through a PA system, the STIPA test signal must be replayed acoustically into the microphone.

For this purpose, an appropriate loudspeaker is required to present the standardized voice-like acoustic signal, simulating a human talker according to IEC , at the correct levels.

Audio Systems without Voice Microphones If the location comprises of a PA system including a hard drive to replay pre-recorded announcements, the STIPA test signal must be injected electronically from an external sound generator. It is recommended that this device be hand-held and portable. The reason is that, for the complete STI assessment of a room, you typically have to execute several measurements at different positions, each of them lasting 15 seconds. After averaging this data, and optionally applying ambient noise correction, it will be convenient for you to check the results immediately.

This allows you to implement changes to the acoustics of the room straight away, if necessary, in order to improve the speech intelligibility, and measure again.

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ГОСТ IEC 60268-1-2014 Оборудование звуковых систем. Часть 1. Общие положения

Also, depending on the type of impulse response measurement that is used, the influence of background noise present during measurements may not be dealt with correctly. A continuously decreasing MTF indicates the influence of reverberation and an MTF that decreases first and then increases again indicates the presence of an echo. Speech transmission index — Wikipedia The new intermittent stimulus consists of an MLS sequence followed by an equally long period of silence. Plots of the STI versus the source-receiver distance can be created with a few mouse clicks.

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DIN EN 60268-16:2004-01

While test signals can be of any kind the measurement procedure stays the same and waveform degradation is measured with a single parameter — Difference level dB. Methods for specifying and measuring general characteristics used for ied performance Status: Worldwide Standards We can source any standard from anywhere in the world. There are several unique Signal Paths used in the sequences which are not a part of the default SoundCheck installation. It is recommended that the sequences be run directly from the IEC folder.

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EVS-EN 60268-16:2003

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