Near-field acoustical holography (NAH) is a technique used to reconstruct the sound field in a given space by measuring acoustic pressure and particle velocity near the source. This method allows for detailed visualization and analysis of sound sources, making it invaluable in fields like noise control, audio engineering, and industrial diagnostics.

Near-field Acoustical Holography

Reconstruct the sound field

Acoustic pressure is the variation in pressure from the ambient atmospheric pressure caused by the presence of a sound wave. It is a crucial parameter in understanding the intensity and propagation of sound in mediums, influencing how sound is perceived and measured.

Acoustic Pressure

Particle velocity is the velocity of a particle in a medium as it transmits a wave, distinct from the wave's phase velocity. It is crucial in understanding how energy and momentum are transferred through mediums in wave phenomena, such as sound waves in air or seismic waves in the Earth.

Particle Velocity

Sound sources

Noise control involves implementing strategies to reduce unwanted sound in various environments, enhancing comfort and compliance with regulations. It encompasses understanding the sources of noise, its transmission paths, and the application of materials and technologies to mitigate its impact.

Noise Control

Audio engineering is the art and science of capturing, manipulating, and reproducing sound through various technologies and techniques. It encompasses a wide range of activities from recording and mixing to mastering and live sound reinforcement, requiring both technical expertise and creative intuition.

Concepts

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