Speakers the final link of the public address system – they transmit voice messages within individual rooms of a given station and on platforms, ensuring that the announcements are well heard and understood. Both the selection and placement of the components of the system are handled by DYSTEN’s internal AUDIO department. Its representatives take into account the required sound power, facility acoustics analysis, technical calculations, required power of speakers and amplifiers, as well as SPL and STI sound pressure level distribution.
The AUDIO department carries out specialist qualitative and quantitative calculations by means of the open EASE (Enhanced Acoustic Simulation Engine for Engineers) software, verifying the loudness and legibility of verbal messages in order to meet the railway requirements.
The attached pictures show the electroacoustic system transmission-oriented speech intelligibility ratio, taking into account the noise level and masking. A female speech was considered in the calculations. It is a key qualitative indicator of the system, as it shows whether the messages transmitted by the system will be understandable for travelers.