SPECIALIZED LOW FREQUENCY WARNING DEVICE Russian patent published in 2007 - IPC G08B1/00 

FIELD: the invention refers to radio technique and may be used in fire fighting systems in quality of a warning device about the fire danger for invalids with sensor disturbances in health(hearing, vision, combined disturbances).

SUBSTANCE: the warning device has an alarm stub, a control block, a state indicator, a voltage converter, a stroboscope, a power amplifier, a low frequency radiator, an accumulator, a feeding controlling block and the charge of the accumulator. At that the controlling block produces a specialized low frequency non-periodic signal of a given algorithm which goes after that through the power amplifier to the low frequency radiator converts it into acoustic signals in the range of 40-100 Hz with the power up to 105 dB; and also produces a signal actuating the voltage converter which provides the stroboscope's work and forms signals of light warning with pulse recurrence rate 20-40 impulses in a minute.

EFFECT: increases efficiency of the warning device.

2 cl, 3 dwg