Selecting The Bar Graph Operating Mode; Setting The Headroom - evertz 7735CEM Manual

When many windows are turned on, the on-screen information can get very crowded. The bar graphs and
text windows are layered to keep the most important information from being covered by other not-so
important windows. The priority is as follows:

7.7.1. Selecting the Bar Graph Operating Mode

Bar graphs
Bar graphs 1 and 2
Bar mode
Normal,
Sum + diff

7.7.2. Setting the Headroom

Bar graphs
Bar graphs 1 and 2
Headroom
0 to 30db
0db
Gray background indicate un-implemented or un-tested features
7735CEM Composite Encoder with Monitoring
Priority Display Type
Level
1 Fault Messages
(top)
2 Time Code
Source ID
Program Rating
3 Status window
4 Phase bar graphs
5 Level bar graphs
(bottom)
In Normal mode, stereo bar graphs are displayed.
In Sum + diff mode, bar graph 1 is the absolute value of the sum of
both channels and bar graph 2 displays the absolute value of the
magnitude of the difference of the two signals.
The headroom is the level difference between a maximum amplitude
signal that can be represented in the digital world (this is called 0 dB FS
or 0 dB Full Scale) to a nominal, user defined operating level,
represented in Decibels. In modern digital studios and broadcast
stations this is on the order of 20 dB.
This control is used to position the 0 dB point for the VU and PPM
meters (excluding AES/EBU ballistics mode that always uses 0 dB FS).
For example, if you set this control to 15dB and input a signal that is –
15 dB FS, then the bar graph top will be at 0dB. If you are in PPM
mode with AES/EBU ballistics, then the meter will read –15dB. When
you adjust this level, you are changing the 0dBr or program reference
point on the bar graphs.
After you set the headroom and select the bar type/mode, you can
adjust the bar graph coloured area sizes with the Error region and
Warning region controls.
Revision 1.1.1
7700 MultiFrame Manual
7735CEM-29