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Designing for Speech Intelligibility – Using the Speech Transmission Index

Learn the factors that affect and limit the speech intelligibility in a space and how they can be overcome and controlled.

You Will Learn:

• Relevent British and European intelligibility standards
• Intelligibility metrics
• Factors that affect the Speech Transmission Index
• Loudspeaker choice and placement
• Reverberation times
• Direct-to-reverberant ratios
• Signal-to-noise ratios, static and time variant
• Intelligibility limits in an acoustic space
• Measuring the Speech Transmission Index (STI-PA and indirect methods)

Who Should Attend:

Everyone involved in specifying, designing or installing sound systems or voice alarm systems where speech intelligibility is important, including engineers, installers, system designers, estimators, consultants and local authorities.

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Loudspeaker, Room Acoustics and how they interact

Learn how the correct selection and placement of loudspeakers in a given acoustic environment, has a direct relationship on perceived sound quality in the listener’s seat.

You Will Learn:

• The acoustic signal path from the loudspeaker to the listeners ear and what it does to the audio signal
• Direct to reverberant ratio and its relevance to speech intelligibility and music fidelity
• How to optimise the direct to reverberant ratio for improved system performance
• The key characteristics that define a loudspeaker: sensitivity, power handling, maximum SPL, bass extension, fidelity and dispersion
• How we define dispersion, a look at polar plots and isobar plots, what they tell you about the acoustic performance of a loudspeaker and how they enable you to compare different devices
• How an informed choice of loudspeaker enables you to optimise the direct to reverberant ratio and therefore maximise audio quality

Who Should Attend:

Everyone involved in specifying, designing, installing or using sound systems – including contractors, estimators, system designers, live sound engineers and theatre technicians.

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Making Waves – Acoustics for Sound Engineers

Learn how to have a better understanding of what happens to sound after it leaves the loudspeakers.

You Will Learn:

• What sound is and how sound travels
• Relationship between the speed of sound, wavelength and frequency
• Amplitude
• How the decibel works
• Equal loudness contours and the implications of
• Frequency weighting
• Point, line and plane sources and their propagation
• Air absorption, reverberation and absorption
• Diffraction, interference, temperature and the speed of sound
• Refraction
• The Doppler effect

Who Should Attend:

All people involved in the sound industry who need to have a better understanding of what happens to sound after it leaves the loudspeakers.

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