On extreme possibilities of active sound suppression systems monochromatic signals

With regard to the problems of sound insulation devices, radiation which occurs mostly at discrete frequencies, describes a system of active damping (compensation) of sound in outer space. The principle of the system is based on the creation of a system of managed radiators compensating field, inverted relative to the field, the primary source. Compensating field is formed on a monochromatic frequency coinciding or sufficiently close to the frequency compensated signal, which must be known in advance or measured. The efficiency of the system when the signal compensation inaccurately known frequency.