How does this acoustic booth look? What's innovative about it?
Kevin Renckly:
"First of all, the acoustic booth named “ Cabin Delta ” meets the requirements of the ISO 4869-3* standard, the basis for the development of anti-noise helmets. Its innovative feature is its compact size of around one cubic metre. Inside, there are a number of noise sources generating a diffuse acoustic field, as well as a standardised false head made up of high-performance microphones.
This assembly enables insertion loss measurements to be carried out, i.e. by measuring the difference in decibels with and without the hearing protector, over a wide range of frequencies from 63Hz to 8000 Hz**.
Once these measurements have been taken and analysed, we can predict, with a small margin of error, the performance results of the noise protection headphones at the time of certification by a notified body (values resulting from so-called subjective tests on human subjects, editor's note).
One highlight: the uniqueness of the ‘Cabin Delta’ and the fact that it was developed in partnership with experts in acoustics has enabled us to take part for the first time as a co-author in the Inter-Noise international acoustics conference in Nantes in August 2024 ’."