BRUEL & KJAER 4185, User Manual

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21 Ear Simulator for Telephonometry Type 4185
User Manual
Chapter 6
Glossary
The following is a list of abbreviations commonly used in association
with telecommunication measurements. Some of the terms can be
found in this document.
Artificial voice
A complex test signal used to simulate human speech
having characteristics corresponding to the average human
voice. See
ITU-T Rec. P.50
BSI British Standards Institution
Capsule
Term used to refer to the transmitter microphone or
earphone transducer when separated from a handset
ITU-T Abbreviation for International
Telecommunication Union,
Telecommunication Standardization Sector
. A committee
of the ITU that publishes recommendations regarding all
aspects of telecommunication
dB
Abbreviation for decibel, used to express a logarithmic
power ratio between two quantities.
X
(in dB) = 10 log
10
(
P/P
0
) where
P
0
is the reference value
DIN Abbreviation for Deutsches Institut für Normung