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Fault definitions
Fault window config
7.10.3. Setting the Video Error Duration
Fault definitions
Video error duration
0 to 255 frames
0
7.10.4. Setting the Audio Error Duration
Fault definitions
Audio error duration
0 to 255 frames
0
7.10.5. Detecting Audio Over Level Faults
The Over level and Over duration controls are used to detect when an audio amplitude is close to a
dangerous level (i.e. clipping a downstream device, or saturating the digital word length). The Over level
control sets the audio level over which there is considered to be a fault. The audio must be over this level
for the duration set by the Over duration control before the fault condition exists. A fault will be generated
when any channel has generated an over condition.
7.10.5.1. Setting the Audio Over Level
Fault definitions
Over level
-30dB to 0dB FS in
1/4dB increments
-6dB FS
7.10.5.2. Setting the Audio Over Duration
Fault definitions
Over duration
3 to 255 SAMPLES
3
Gray background indicate un-implemented or un-tested features
7735CEM Composite Encoder with Monitoring
This control is used to change the fault window colours. These
parameters can also be set using the Fault window config menu
items on the On screen display menu. See section 7.8.5 for a
complete description of the Fault window config menu items.
This control sets the duration, in number of consecutive frames of
video, that video needs to disappear before the Video error fault
condition exists.
This control is included so that you can have a few frames of
missing/bad video before the fault occurs. This is useful to eliminate
fault generation when upstream non-synchronous switching occurs.
This control sets the duration, in number of consecutive frames of
video, that audio needs to disappear before the Loss of audio fault
conditions exists.
This control is included so that you can have a few frames of
missing/bad embedded or external audio before the fault occurs. This
is useful to eliminate fault generation when upstream non-synchronous
switching occurs.
This control sets the audio level over which there is considered to be
over level. This value is expressed in dB full scale (FS) and can even
be used to detect digital clipping. If set to 0 dB FS, then if 3 or more
consecutive samples (set with the duration control) are at digital
saturation (max or min), then the digital word length has been
exceeded.
This control sets the duration, in number of consecutive samples that
are at or above the Over level before a fault condition exists.
Note that as longer durations are configured, you are eliminating the
detection of higher frequency content over the set Over level.
Revision 1.1.1
7700 MultiFrame Manual
7735CEM-47
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