Sound emission

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In acoustics, the emission of sound ( sound event ) from a sound source is referred to as sound emission (from the Latin emittere = to send out) . The measured variable belonging to the sound emission is the source strength, indicated as the sound power level L w .

The Machine Noise Information Ordinance in Germany stipulates that manufacturers of many machines and devices must clearly indicate the noise emissions on the product, e.g. B. the manufacturers of lawn mowers .

When forecasting sound immissions, the sound pressure level of the sound immission at a specified distance from the sound source is determined according to specified models . The further propagation is then calculated on the basis of this sound pressure level and the known distance to the sound source. The sound pressure level at the specified location is referred to as the emission level in the context of noise protection .