
Impulse noise
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Nyquist Team
A sudden crack, a shot, or a press impact – these are sounds that last only fractions of a second but carry enormous energy. Impulsive noise poses a particular measurement challenge and is one of the most dangerous enemies of our hearing.
Professional Definition
Noise consisting of one or more impulsive sounds.
Characterized by a rapid increase in sound pressure level in a very short time (usually less than 1 second). Standard averaged RMS measurements are not sufficient for assessing such phenomena; peak values (Lpeak) must be studied. Such a signal has a wide frequency spectrum and great dynamics of change.
Acoustics in Simple Words
Let's compare continuous noise (e.g., fan noise) to a strong stream of water from a garden hose – you feel a constant pressure. Impulsive noise is like a water hammer or a sudden splash from a bucket. Although it lasts a short time, the force of the impact is powerful at that moment. Our ear has a natural defense mechanism (stapedius reflex), but with impulsive noise (e.g., a gunshot), the sound is so quick that this mechanism cannot react in time, risking immediate injury.
Summary
Impulsive noise is a short-lived, violent acoustic event of high amplitude. Due to its nature, it is more harmful to the hearing organ than steady noise at an equivalent energy level.
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