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Speech Transmission Index STI - Definition, Prediction and Measurement

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Importance of Speech Transmission Index
Technical Definition of Speech Transmission Index
How to choose the suitable STI parameter for your design
How to predict and listen to Speech Transmission Index by using Electro-Acoustic Software
How to measure to Speech Transmission Index after Installation

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Speech Transmission Index STI - Definition, Prediction and Measurement

  1. 1. Speech Transmission Index STI – EASE Software Prediction STIPA – STI Public Address Measurement
  2. 2. Acoustic Lighting Thermal Air Quality Building Physic
  3. 3. Audio Engineering Society Acoustic Society of America US Green Building Council Illumination Engineering Society Organization International Well Building Institute
  4. 4. Clearly Inform persons in danger about escape information and directions in case of an Emergency • Airports • Railway Stations • Shopping Centres • Sport Halls • Concert Halls • Etc Hearing Threshold Level Modulation Transfer Function Public Address Speech Spectrum Level Noise Spectrum Level Foto Proyek Speech Transmission Index. Psychoacoustic Masking Distorsion
  5. 5. Standardization Fire detection and fire alarm systems Sound systems for Emergency purposes Objective rating of speech intelligibility by speech transmission index Fire detection and alarm systems, section 16 & 19 CEN/TS 54-32 ISO 7240 IEC 60268-16 EN 50849
  6. 6. Definition Noise due to all other sound sources than the communication speech Sound pressure level in octave bands due to ambient noise, spatially averaged over the relevant listener area The important acoustical parameters for a sound source representing a human speaker are the speech level and the directivity, both given in octave bands. The source for generalised speech level data is the American Standard ANSI 3.5 [4] Ambient Noise Background Noise Level Human Speaker Electro-acoustic system used to address a group of people Public Address
  7. 7. Definition Speech level equivalent to 60 dB(A) at 1 m distance in front of the talker’s mouth Difference between the sound pressure level of the speech or test signal and the sound pressure level of the background noise Reference Speech Level Signal Noise Ratio Three different types of sound source are considered in this application note, a human speaker, a sound reinforcement loudspeaker system and a constant-voltage speaker system, also called a high-voltage audio distribution system. Sound Source
  8. 8. Definition Rating of the proportion of speech that is understood Speech Transmission Index: Objective method for prediction and measurement of speech intelligibility Value of STI calculated from the reverberation time and assuming an ideal exponential decay of energy Speech Intelligibility STI STI (expected) A condensed and approximate version of the STI measurement method for PA systems STIPA
  9. 9. Definition Rapid Speech Transmission Index: A simplified and approximate measurement method for rating speech transmission in auditoria, with or without sound systems. IEC 268-16:1988 Obsolete Is the process of adjusting the electric power applied to a constant-voltage speaker system, by connecting various input taps to the step-down transformer. The adjustment of the electric power leads to an adjustment of the sound power emitted by the loudspeaker unit Characterisation of the sound level emitted by a human speaker, quantified objectively by the A-weighted speech level at 1 m distance in front of the mouth and qualified subjectively by a description Ra(STI) Taping Vocal Effort Electro-acoustic system used to broadcast speech messages or warning signals in an emergency Voice Alarm
  10. 10. Vocal Effort ISO 9921: Vocal effort of a male speaker and related A-weighted SPL at 1 m in front of the mouth ANSI 3.5 [4]: Speech spectra in octave bands for different vocal effort. SPL at 1 m in front of the mouth and the calculated corresponding sound power levels. The additional data at 63 and 125 Hz have been suggested in
  11. 11. STI Intelligibility rating and relations to STI and phonetically balanced (PB) ISO 9921: Recommended minimal performance ratings for intelligibility and vocal effort
  12. 12. STI IEC 60268-16 [1, Annex F]: a scale with 12 qualification bands labelled from A+ to U
  13. 13. STI Examples of sound power levels to be used to calculate the overall noise level in an open-plan space for teaching
  14. 14. Speech Auditoria STI > 0.72 PredictionElectro Acoustic Software
  15. 15. 18/04/19 1 2 STI 0.6 STI 0.7 STI 0.8 STI 0.85 PredictionElectro Acoustic Software
  16. 16. MeasurementSTI Public Address (STIPA)
  17. 17. Question? https://www.facebook.com/altaintegra/ https://twitter.com/altaintegra https://www.instagram.com/altaintegra/ https://www.linkedin.com/company/22333143/ https://www.youtube.com/channel/UCHsNUdk8bn4Ryn886h27uBA

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