Speech Intelligibility is fundamental to a room design, whether it′s a courtroom, hearing room, or other location that requires parties to hear the spoken word correctly. Why is it so important? A great example to explain the importance is to read the following paragraph:
"For many listeners in a court, tribunal or commission, the proceedings will have a major impact on their lives. The sound of speech in the courtroom should therefore be comfortable, so that listeners are able to easily recognise words without having to strain or concentrate on listening. This must be achieved under all normal operating circumstances." Stuart Herring / Redfish
The main aim in any acoustic design for these type rooms is therefore to ensure that each person in the room can clearly be heard and understood. Any person listening must be able to understand what the person speaking is saying; in other words the speech must be comprehensible and understandable.
Each spoken word is created out of the phonetic combination of a limited set of vowel and consonant speech sound units, and it is the correct recognition of the consonant sounds that is the principle factor in speech intelligibility. However, consonant sounds are nearly all of a transient nature ? They are very short and rapidly changing sounds, often having very little acoustic power.
If every person within a courtroom is to hear
well it is obvious that the sound, particularly the high frequency consonant
sounds, at each listening position must be loud enough. It sound complex and it can be complex to get right. One of the core measurement to get it right however is meet the international standard for Speech Transmission Index (STIpa) IEC 60268-16:2011. This standard is the most established method for measuring speech intelligibility.
Redfish Technologies has invested time in understanding this issue, and more importantly in way to manage and create the best speech intelligibility possible for any room. We have invested in calibrated certified equipment that can test STI and Reverberation Times (RT60) to ensure any room meets the highest level of speech intelligibility. We also work with like-minded partners who can go even further above this level of testing to "tune" a room to a level that is only possible with high level commercial audio equipment, a high level of expertise and sophisticated testing instruments.
Audio Generator & Impedance MeterThe Minirator MR-PRO provides a full set of analogue audio signals including sine wave, pink noise, white noise, delay test signal, polarity test signal, stepped sweep and continuous sine sweep. Further, a set of wave-files, useful for system optimization, is stored in the internal flash memory.
Applications include. Installed Sound, Life Safety Systems, Live Sound, Broadcast, Building Acoustics, Industrial and Aerospace, Quality Control.
Acoustic and Audio AnalyserThe XL2 Analyser forms the unique combination of a state-of-the-art Sound Level Meter, a comprehensive Acoustic Analyser as well as a powerful Audio Analyser. Redfish Technologies uses this in conjunction with the M4260 calibrated reference microphone.
Applications include. Installed Sound, Life Safety Systems (EVAC), Noise Monitoring, Live Sound, Broadcast, Building Acoustics, Industrial and Aerospace
Acoustic Generator (STIPA Reference)The TalkBox is an acoustic signal generator for speech intelligibility measurements in evacuation and announcement systems, as well as for level alignment of teleconference or other audio systems. It allows the complete end-to-end evaluation of the speech intelligibility STIPA from the talker?s microphone to the listener?s ears.
Self Powered DodecahedronThe Self Powered Dodecahedron for the use of reverberation testing from within the room. This unit provides a single sound source point to allow audio signals to be centred around the room.
Redfish uses the very first active dodecahedron speaker available on the market and is one of the most advanced and flexible systems available on the market. Manufacture Switzerland, which is well known for quality systems and precision test instruments.
The speaker is provided in an extremely compact enclosure, with 12 extended
frequency response speakers and a 650W
amplifier module, 2 IN / 4 OUT DSP and a Rx module for
remote control of the Dodecahedron test speaker.