Acoustics Science and Treatment of Sound

Numerical specifics and definitions regarding the character and quality of sound in the field of acoustics.

Elements of Acoustics

1. Source 2. Transmission path 3. Receiver

Porous Absorbent

Best for lower band frequency

Echo

The repetition of a sound produced by the reflection of sound waves from an obstructing surface, loud enough and received late enough to be perceived as distinct from the source; characterized by magnitude and delay.

Resonance

The intensification and prolongation of sound produced by sympathetic vibration

Phon

Unit of loudness level

Sound Absorption

Process of dissipating sound energy by converting it into heat

Sound

Fluctuation in pressure, particle displacement in elastic medium

Sabin

unit of absorption equivalent to $1\,sq\,ft$ of perfectly absorptive material

Frequency

The number of times a cycle is repeated; expressed in hertz.

Decibel

unit of sound

Noise

unwanted sound

Decay time

reverberation tie

Hertz

the Si unit of frequency

Cycle

full circuit of particle

Amplitude

maximum displacement

Velocity

speed of sound

Wavelength

distance

Pure tone

one energy one frequency

Musical Tone

many pre tones

Intensity

rate of flow at sound energy

Reverberation

the prolonging of sound

Flutter

rapid succession of echoes caused by the reflection of sound waves back and forth between two parallel surfaces

Creep/ Crawl

reflection of sound from a curved surface

Diffusion

sound is everywhere

Refraction

when traveling forward in a straight path, it changes direction as it passes through different density and causes sound wave to bend

Diffraction

acoustic phenomenon which causes sound wave to bend

Focusing

sound waves reflected from a concave surface