Is it truly feasible for railway operators to strike the perfect balance between crystal-clear announcements and reduced residential noise?
It’s no pipe dream anymore. Discover how flat panel speakers enable trams to announce their line numbers, destinations and stops in an optimal, targeted, intelligent way.
Talking trams employ an innovative acoustic announcement system in which the external skin of the vehicle itself acts as a flat-panel loudspeaker. Electromagnetic actuators are built into the side walls of such trams or buses and transmit vibrations – such as announcements – to the outermost layer of the vehicle.
As opposed to external speakers, the sound quality offered by electromagnetic actuators is significantly better, and can therefore be more targeted. This particularly benefits visually impaired passengers, and offers benefits to operators that prioritise noise reduction, accessibility and passenger comfort. Passenger information managers can also rely on this technology to deliver more targeted, efficient messages.
Just a few of the technology’s exciting features:
The technology’s electromagnetic actuators enable a broad, almost phase-linear reproduction over 7 octaves, from less than 100 Hz to over 10kHz in frequency. This guarantees high-quality speech reproduction. Noise-dependent volume control adapts the volume of external announcements to ambient noise conditions, further boosting intelligibility.
With this system, there is a sharp drop in sound pressure level beyond the bus or tram stop zone, thanks to the type and placement of actuators, noise-dependent volume control and intelligent night volume reduction to a maximum of 12 dB.
Existing power reserves makes it possible to integrate other functionalities, such as on-board computers for passenger information, automatic passenger counting (APC) systems, video surveillance, etc. – reducing costs and space.
*(Combino/Siemens and existing vehicles MGT6D/Duewag) Picture © Erfurter Verkehrsbetriebe
This article was originally published by Televic Rail.
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