Policy on Intellectual Property Right (IPR)
Annex 1 Use of the decibel and the neper
1 Definition of the decibel
1.3 The decibel may be
used to express the ratio of two values of a quantity connected with power by a
well-defined relationship. In this case, the logarithm of this ratio must be
multiplied by a factor representing the relationship which connects the
quantity with a power, and a term representing a multiplying factor may be
added to it.
2 Definition of the neper
3 Use of the decibel and
neper
4 Rules for the use of the
symbols where dB is included
4.1 The symbol dB
without additional indication
4.2 The symbol dB
followed by additional information within parenthesis
4.3 The symbol dB
followed by additional information without parenthesis
5 Loss and gain
5.1 Transmission loss
5.2 Antenna gain
6 Levels
6.1 Absolute power
level
6.2 Relative power
level and related concepts
6.2.1 Definition
6.2.2 Transmission
reference point (see Recommendation ITU-T G.101)
6.2.3 Meaning
of “dBm0”
6.3 Power density
6.4 Absolute power
density level
6.5 Absolute voltage
level
6.6 Audio frequencies
6.6.1 Absolute
audio-frequency noise level
6.6.2 Relative
voltage levels
6.6.3 Use of
the decibel, by extension, for ratios of quantities not connected with power
6.7 Absolute level of
an electromagnetic field
6.8 Sound pressure
level
7 Ratios expressing
transmission quality
7.1 Signal-to-noise
ratio
7.2 Protection ratio
7.3 Carrier to
spectral noise density ratio (C / N0)
7.4 Energy to spectral
noise density ratio
7.5 Figure of merit (M)
8 Special notations
Attachment 1 Notation for expressing the reference of a level