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Audio Metering Display
The audio metering displays show you the audio levels in the embedded audio of the SDI video
signal. Up to 16 channels of embedded audio are de-embedded and then displayed in either
dBVU or dBFS format.
The VU meter shows average signal levels, is easy to use and very common on older equipment.
VU is calibrated to the SMPTE recommendation of a 1 kHz tone test signal set to -20 dBFS.
dBFS is essentially a meter of the overall digital audio signal and is common on modern digital
equipment.
The right hand audio scope can monitor two channels of audio, which can be selected from the
'set' drop down menu. e.g., ch 1 & 2, ch 3 & 4, etc. The audio scope presents audio in an X-Y
view so you can see audio balance issues, out of phase conditions and whether an audio track
is mono or stereo. Mono audio should appear as a single vertical "in phase" line. If the line is
horizontal, then your audio is "out of phase" and could cancel out (i.e., loss of audio) when
received by downstream equipment. Audio phase is one of the most common audio faults in
large facilities, where cables can be incorrectly connected.
When monitoring stereo signals, the line of the right hand audio scope fans out to represent the
difference between the left and right audio channels. The more stereo sound contained in the
audio track, the more circular the line will appear. If the audio contains minimal stereo content,
then the scope will appear more concentrated around the vertical axis.
Dialog audio tends to appear as a vertical line, whereas music with plenty of stereo content will
cause the scope to puff out. This is because mono audio is L+R, and will display on the vertical
axis, whereas stereo content is L-R, and will display on the horizontal axis to show the stereo
difference.
Audio metering display showing peak levels and audio balance
Use the "Set" drop down menu to select which pair
of audio channels to monitor.
Using SmartScope Duo 4K
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