Noise
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Nyquist Team
In an ideal world, every sound would carry a clear message, like words or music. However, in reality, we are surrounded by acoustic chaos that does not adhere to simple melodic rules. This phenomenon is a challenge for engineers and a standard for nature.
Professional Definition
Noise is a sound whose variability over time at a given point in space is described by a random function.
From the perspective of physics, noise differs from tones or musical sounds in its lack of periodicity. Its time course is unpredictable (stochastic), which means that we cannot precisely determine the amplitude of the signal at a future moment based on its history, but can only describe it using statistical parameters, such as mean or variance.
Acoustics in Simple Words
Think of the difference between a marching army and a crowd at a market. The army marches uniformly, to a rhythm – this is a periodic signal (music). The crowd at the market moves chaotically, each in a different direction, with no apparent order – this is noise. In acoustics, it is a signal that consists of so many random vibrations that our brain cannot extract a specific pitch from it.
Summary
Noise is an inseparable element of the acoustic environment, characterized by a random structure. It can be both an undesirable disturbance and a useful masking or measurement signal.
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