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A Helmholtz resonator is used to target and absorb specific frequencies by resonance, often to reduce room modes and standing waves.

A diffuser scatters sound waves, reducing standing waves and echoes to improve sound quality in a space.

Transmission loss measures the effectiveness of a barrier in preventing sound transmission between spaces, usually quantified in decibels (dB).

Sound insulation prevents sound from transmitting from one space to another, using mass, damping, and decoupling techniques.

Acoustic panels absorb sound to control reverb and echoes, and are commonly made from foam, fabric-wrapped fiberglass, or other porous materials.

A bass trap is designed to absorb low frequency sound to prevent build-up of bass, which is common in corners and at room boundaries.

Room modes are resonances that occur at specific frequencies determined by room dimensions and can cause uneven frequency response, which are mitigated with strategic placement of absorbers and diffusers.

Skyline diffusers are 2D diffusers that scatter sound in multiple directions, resembling the varied heights of a city skyline.

Flutter echoes are repetitive sound reflections that create unwanted noise, and are usually addressed by placing absorbers or diffusers between parallel surfaces.

Reflection phase grating scatters sound to prevent coherent reflections and flutter echoes, thus enhancing the diffusion of sound in a space.

A Schroeder diffuser is another name for a quadratic residue diffuser, optimizing sound diffusion through mathematical design.

This type of diffuser uses wells of different depths to diffuse sound uniformly, based on number theory to tackle room acoustics issues.

Ceiling baffles are vertically hanging absorptive treatments that help reduce noise levels and reverberation times in large open spaces.

Acoustic decoupling separates structural elements to reduce the transmission of sound through vibration, often used in walls and flooring systems.

An absorber reduces the reflection of sound waves by converting the sound energy into heat, thus controlling reverberation in rooms.

Soundproofing involves creating barriers to prevent sound leakage between spaces, using materials and techniques to block sound transmission.

Reverberation time is the time it takes for a sound to decay by 60 decibels after the source has stopped, crucial for room acoustics design.