Abstract: Acoustic sensor device with noise suppression, in particular for sensors arranged on a noise-generating aggregate, using a double sensor (M1, M2) located between a noise source (S) and an object emitting the sound to be picked up, one of the sensors (M1) being directed towards the noise source (S) and supplying to a control circuit (R) a noise signal which controls an anti-noise source (A) in such a way that it generates an anti-phase sound p.sub.A for compensating the noise p.sub.S, the other sensor (M2) being directed toward the object to be measured and supplying a measuring signal in which the noise fraction is highly weakened and the useful sound fraction is barely weakened, so that the acquisition range of the sensor (M2) is extended as a result of this reduction of sound fractions as a function of the direction of arrival.

Abstract: A protective suit against sound waves with which it is possible to achieve a considerable reduction of the effects of sound waves on the human body. The suit material is furnished with at least two flexible soundproofing layers, of which at least one layer increases the weight per unit area of the suit, and another acts as a cushioning layer.