Abstract

Although impulse noise is more harmful than continuous noise, the absence of a controlled source of impulse noise renders evaluation of the determinants of the harmful effects impossible.

A method of generating completely-defined impulse noise by computer was developed. A return signal allows verification of the resemblance of the actual noise received to that emitted.

A device capable of controlling all the necessary impulse noise parameters (frequency, duration, amplitude) up to 140 dB was developed. Using this device, two important determinants of the harmfulness of this type of noise were identified: presence of high frequency components, and lengthy impulse duration.

Workers can be better protected against deafness through continued research on other factors affecting the harmfulness of impulse noise, and by the development of measures by which the presence of such noise in the workplace can be reduced. Several companies requested an evaluation of the protection provided by hearing protection against impulse noise.