USER’S MANUAL. PROMAX-4
Novembre 1999 Page 29
English
APPENDIX C.- MEASUREMENT OF THE VIDEO / AUDIO RATIO
)dB(AVA/V
LL
−=
It permits to measure the ratio between the video carrier and the audio carrier
amplitudes.
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.
Figure 12.-
Video / Audio ratio measurement.
These specifications ensure that there is no interference in the same or the
adjacent channel.
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