| 词条 | Sending loudness rating |
| 释义 |
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. References1. ^{{Cite web|url=https://www.itu.int/rec/T-REC-P.79/en|title=P.79 : Calculation of loudness ratings for telephone sets|last=tsbmail|website=www.itu.int|access-date=2016-12-20}} {{DEFAULTSORT:Sending Loudness Rating}}{{Engineering-stub}} 1 : Microphones |
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