Weighting in Audio Measurement
In broadcasting and audio equipment measurements 468-weighting is the preferred weighting to use because it was specifically devised to allow subjectively valid measurements on noise, rather than pure tones. It is often not realised that equal loudness curves, and hence A-weighting, only really apply to tones, as tests with noise bands show increased sensitivity in the 5 to 7 kHz region on noise compared to tones.
Other weighting curves are used in rumble measurement and flutter measurement to properly assess subjective effect.
In each field of measurement, special units are used to indicate a weighted measurement as opposed to a basic physical measurement of energy level. For sound, the unit is the phon (1 kHz equivalent level).
In the field of acoustics, and audio engineering, it is common to use a standard curve referred to as A-weighting, one of a set that are said to be derived from equal-loudness contours.
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