AP P E N D IX C
M E AS U R E M E N T O F T H E R E LAT IV E V ID E O / AU D IO LE V E L (V /A) -AN ALO G U E
C H AN N E LS -
V / A = A
L
- V
L
(dB)
The user can measure the existing ratio of the amplitudes of the video-to-audio
carriers.
Although this process depends on the standard used, it is usual to consider that
a properly transmitted PAL channel should have a sound subcarrier 13 dB below
the video carrier.
F igure 10.-
Measurement of the relative video/audio ratio.
These specifications ensure that there is no interference in the same or the
adjacent channel.
