Definition of Sending loudness rating
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).
Terms mentioned above
Related terms
Cassette adapter
A cassette adapter, also called a car connecting pack, is a device that allows audio…
Automixer
An automixer, or automatic microphone mixer, is a live sound mixing device that…
Contact microphone
A contact microphone is a form of microphone that senses audio vibrations through…
Gain before feedback
In live sound mixing, gain before feedback (GBF) is a practical measure of how much a…
Silencer (firearms)
A silencer, also known as a sound suppressor, suppressor, or sound moderator, is a…
DI unit
A DI unit (direct input or direct inject) is an electronic device typically used in…
Tape recorder
An audio tape recorder, also known as a tape deck, tape player, tape machine, or simply…
Sound quality
Sound quality is typically an assessment of the accuracy, fidelity, or intelligibility…
Phonautograph
The phonautograph is the earliest known device for recording sound. Previously, tracings…
Frequently asked questions
What is Sending loudness rating?
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…