BELLSONIC is an association, which began its activity in April 2000, embracing the Polish territory.
The associations goal is to spread the knowledge on modern audio techniques:
BELLSONIC achieves its goals by:
BELLSONIC Association joins specialists from different fields: architects, lawyers, doctors, scientists, acoustic-physicians, sound designers, interior architects, audio engineers, fire protection and safety specialists.
Innovative sound techniques, which help evacuate people from public buildings.
Voice Alarm® in a public building, means replacing typical fire signals - bells and sirens, with adequate speakers, capable of transmitting clear and intelligible spoken messages.
The transmission of intelligible message through the speakers includes the necessity of fulfilling strict technical conditions, which are:
It is a physical phenomenon, which occurs in large areas with high ceilings. The surfaces (walls, ceiling and floor) reflect sound, causing long reverberation time.
The "reverberation noise" phenomenon takes place when sound energy, reflecting from the walls and ceiling, superimposes. It does not only lose its power but is reinforced 3dB higher.
The superimposing of sound waves results in the loss of clarity and intelligibility of the message (auditions and spoken messages) transmitted by the speakers, which makes them uncomfortable to listen to.
The characteristic point is, that the louder is the source (speaker - emits a larger energy), the bigger is the "reverberation noise" effect !
tel./fax (0 58) 763 12 87, e-mail: firstname.lastname@example.org