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Noise reduction

1) Introduction

The sound can be air or driving structural conduction. Most sources radiate sound both as otherwise. The following diagram shows that for noise reduction measures can be taken at various levels in the chain: at the source, about the means of propagation, interfaces and/or on the receiver.

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Noise bells

Sound of bells and sound amplification systems

Over the years the sound of bells coming assuming an increasingly significant expression in the universe of complaints for noise. Notwithstanding the Constitution, in your article 41, stating that the bells are a form of freedom of expression, through touch and with the passing of hours call to prayer, invoke festive moments or headstones, the noise produced by a public address system associated with the bells of a church must respect the limits set by the general regulation of noise, the drafting of Decree-Law No. 9/2007. Read more

Evaluation Temporal Characteristics of Acoustic buzzer with a sound level meter

Drop Falling into WaterIntermittent noise, as well as the resulting impact, explosives or shots are more bothersome than stable and continuous noise – as the sound of rain – because I são sudden and unexpected. This type of noise can even trigger a reflex reaction scare, startle with effects not only psychological but also physical. However the only body back to its previous state after a few minutes.

Weighting Time

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