Audio Calculations

Acoustic Cavity
The acoustics of enclosed volumes are important when considering sound propagation within the volume.
A Weighting
This is the most generally used filter when making overall noise measurements.
Bark
The Bark is the standard unit corresponding to one critical band width of human hearing.
B Weighting
The B-weigthing curve approximately follows the 70 phon curve.
Circular Frequency
The frequency of a steady recurring phenomenum in radians per second.
C Weighting
The C-weighting curve approximately follows the 100 phon curve.
dBA
A sound-level meter reading with an A-weighting network simulating the human-ear response at a loudness level of 40 phons.
dBB
A sound-level meter reading with a B-weighting network simulating the human-ear response at a loudness level of 70 phons.
Decibel
The human ear responds logarithmically and it is convenient to deal in logarithmic units in audio systems.
Quarter Wave Tube
A resonator used most commonly on automotive air intake systems to reduce resonance.
Sound Transmission Class
In acoustics, a single number rating for describing sound transmission loss of a wall or partition.
Speed of Sound
Depends on the elastic and inertial properties of the particular medium.

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