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An acoustic panel absorbs sound to reduce reflections and reverberation. It's commonly used in recording studios, home theaters, and other places needing acoustic control.

Room acoustic treatment refers to the use of absorptive, diffusive, and reflective materials and structures to control sound characteristics. It's important for optimizing a room's acoustics for its intended purpose.

The Sabine equation

A diffuser is a device used to scatter sound in various directions to reduce focused reflections and modal resonances. It helps to create a more diffuse sound field, which is generally desirable in acoustically treated spaces.

The absorption coefficient measures how much sound is absorbed by a surface rather than reflected. It varies between 0 (total reflection) and 1 (total absorption) and affects the reverberation in a room.

A decibel is a unit of measurement for the intensity of sound, where a 10 dB increase represents a doubling of subjective loudness. It's crucial for assessing sound levels in room acoustics.

A Helmholtz resonator is designed to absorb specific frequencies, based on its volume and neck dimensions. It's often used as a bass control method in acoustic treatment.

RT60 is the time it takes for sound to decay by 60 decibels after an abrupt termination. It's vital for characterizing the acoustics of a room and designing spaces with appropriate sound characteristics for their intended use.

Flutter echo is a rapid series of echoes from parallel reflective surfaces. It can cause a distinctive and often undesirable 'fluttering' sound effect in a room.

A bass trap is an acoustic energy absorber designed to damp low-frequency sound energy. It helps to reduce room modes and standing waves, thus improving the sound clarity in rooms.

Impulse response is a recording of how sound evolves over time in a space after a short, sharp sound. It's used to analyze the reverberation and acoustic properties of a room.

Reflection is the bouncing back of sound waves when they hit a hard surface. It affects the way sound propagates in a room and can lead to echo and reverberation effects.

Early reflections are the first sound reflections from walls, ceilings, and floors reaching the listener shortly after the direct sound. They can either positively or negatively affect speech clarity and musical quality.

Diffraction refers to the bending of sound waves around obstacles and openings. It can affect the sound field distribution in a room, especially in relation to furniture and room shape.

Standing waves, or room modes, occur when two waves of the same frequency interfere with each other while traveling opposite directions in a bounded medium. They are responsible for uneven bass response in rooms and can cause acoustic problems.

STI is a measure of speech intelligibility in a room, based on the modulation transfer function. A higher STI value indicates better speech understanding, which is crucial for public spaces like auditoriums and classrooms.

Diffusion refers to the scattering of sound waves, reducing focused reflections and creating a more even acoustic field. It enhances the sense of spaciousness and is often achieved through irregular surfaces.

Sound isolation involves preventing sound from entering or leaving a room, which is key for recording studios and private spaces. It's achieved with construction techniques and materials that block sound transmission.

NC curves are used to specify acceptable levels of background noise in a room or building, providing a standard for noise comparison across different spaces.