Psophometric weighting (from : psóphos "noise") refers to any
weighting curve used in the measurement of noise. In the field of audio engineering it has a more specific meaning, referring to noise weightings used especially in measuring noise on telecommunications circuits. Key standards are
ITU-T
The International Telecommunication Union Telecommunication Standardization Sector (ITU-T) is one of the three Sectors (branches) of the International Telecommunication Union (ITU). It is responsible for coordinating Standardization, standards fo ...
O.41
"Psophometer for use on telephone-type circuits"
''ITU-T O.41'', October 1994 and C-message weighting as shown here.
Use
A major use of noise weighting is in the measurement of residual noise in audio equipment, usually present as hiss or hum in quiet moments of programme material. The purpose of weighting here is to emphasise the parts of the audible spectrum that ears perceive most readily, and attenuate the parts that contribute less to perception of loudness, in order to get a measured figure that correlates well with subjective effect.
See also
*Audio system measurements
Audio system measurements are used to quantify audio system performance. These measurements are made for several purposes. Designers take measurements to specify the performance of a piece of equipment. Maintenance engineers make them to ensur ...
* Equal-loudness contour
* Fletcher–Munson curves
* Noise measurement
* Headroom
* Psophometric voltage
* Rumble measurement
* ITU-R 468 noise weighting
* A-weighting
*Weighting filter
A weighting filter is used to emphasize or suppress some aspects of a phenomenon compared to others, for measurement or other purposes.
Audio applications
In each field of audio measurement, special units are used to indicate a weighted measure ...
* Weighting
* Weighting curve
References
{{telecommunications-stub
Noise (electronics)