About: Sending loudness rating

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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).

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  • 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 has the frequency weighted sensitivity calculations in it for sending loudness rating (SLR) and receive loudness rating (RLR) for telephony. (en)
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  • 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). (en)
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  • Sending loudness rating (en)
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