Акустични предупредителни системи са използвани за предупреждение в случай на опасност години наред. Произвеждане на звук чрез удари върху метални предмети е бил използван в древността; по-късно късно камбанни кули били построени за тази цел, а в началото на 20ти век започнаха да се появяват механично въртящи се сирени. Основно те представляват електронен мотор със специално адаптирана глава, която произвежда звуци чрез въртеливи движения. Дори сега този вид сирени се използват в много страни. Развитието на електрониката също има влияние върху развитието на тази област и първите електронни сирени започват да се появяват в края на 20-ти век ...

Just like electronic sirens, electronic public address systems are sound distribution equipment. Yet, while sirens are exclusively used for exterior sound distribution, public address systems can be used for interior sound distribution as well. Another difference between these systems is that the amplifier output of a public address system is divided between several loudspeakers with lower output. The loudspeakers are therefore mounted closer to each other and are usually connected to the amplifier via 100V mains. This use of lower output and a higher number of loudspeakers makes it possible to ...

Telegrafia has developed special equipment and software enabling maximum automation and monitoring of processes carried out by warning and notification centres in order to make these processes more effective. Based on the default scenarios this software and equipment enable automated task execution. They further enable other scenarios including modifications and manual interventions. Operators are able to focus on more critical activities while routine activities are carried out by the software. The core of these systems is represented by ...

As soon as an emergency situation occurs certain activities, namely those defined in default scenarios, are carried out at warning and notification centres. The VEKTRA software package has been developed to support these processes and to maximize the level of their automation. It forms the interface between operators and the technology with which they work. On the basis of our long-term cooperation with our customers this interface has been optimized to make working with the system much more smooth and efficient even in stressful situations.

There is a wide range of accessories offered as additions to our basic products, e.g. poles for siren mounting, sound baffles, beacons, loudspeakers, various types of cables, radio stations, aerials, lightning arresters, batteries, solar panels etc. All these accessories are produced by renowned manufacturers and some of them are tailored to our designs and are produced exclusively for us. They are optimized to be compatible with our products in order to provide our customers with the best possible quality.