This article needs additional citations for verification. (February 2016) |
This article relies largely or entirely on a single source. (September 2024) |
The sending loudness rating (SLR) is a measure of the loudness of the transmit audio sent through the microphone of a communication device (for example, a mobile phone) It compares the Sound intensity of the sound waves into the microphone to the resulting audio signal. It is measured in dBV/Pa.
For telephony, the reference sound pressure level is 20 micro-Pascals, with values in dB referenced to that value.
20 micro-Pascals is called the Threshold of human hearing, and is equal to 0 dB Sound pressure level (SPL).
ITU-T recommendation P.79[1] has the frequency weighted sensitivity calculations in it for sending loudness rating (SLR) and receive loudness rating (RLR) for telephony.
References
edit- ^ tsbmail. "P.79 : Calculation of loudness ratings for telephone sets". www.itu.int. Retrieved 2016-12-20.
 | This engineering-related article is a stub. You can help Wikipedia by expanding it. |