complex ratio of acceleration to applied force.

range of frequencies, usually of standard size in acoustics, for example Octave or 1/3-octave Bands. The lower and upper frequencies are also known as the -3 dB or half-power points.

also called wideband noise - noise whose energy is distributed over a wide section of the audible range as opposed to Narrowband Noise.

3-values related to the attenuation provided by hearing protectors at High, Medium and Low frequencies - supplied by the manufacturer. BS EN ISO 4869

averaged sound level with selectable Exchange Rate. Results also vary depending if a Threshold Level was used.

analysis made on a fractional part of an Octave where n is the variable. Commonly used values are 1/1, 1/3, 1/12 and 1/24-octave.

converts a Analogue signal to a Digital signal.

the connection of a signal from one circuit to another in a manner that rejects DC components.

the connection of a signal from one circuit to another in a manner that rejects DC components.

is the rate of change of Velocity and is a Vector quantity.