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OmniTek 2.3 User Manual

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Page 100 
OmniTek XR User Guide, Software Release 2.3 
Dolby E Frame
Dolby E Frame
Dolby E Frame
Video Frame
Video Frame
Video Frame
G
u
ar
d
 Ba
nd
G
u
ar
d
 Ba
nd
G
u
ar
d
 Ba
nd
Line 
512
NTSC
Line 
513
Line 
512
Line 
513
Line 
525
Line  
1
Line 
10
Line 
13
Line 
14
Line 
603
PAL
Line 
604
Line 
603
Line 
604
Line 
625
Line  
1
Line  
6
Line 
13
Line 
14
Approx. end of 
Dolby E Frame
Dolby E 
Reference 
Position
Switching 
Area
Approx. end of 
Dolby E Frame
 
For NTSC format video (frame rate 29.97Hz), the reference line is line 14, while for PAL 
(25Hz frame rate) the reference line is line 10. Current practice is for about 5% of the 
available data space to be used as a guard band. 
Where the Dolby-E option is installed, OmniTek XR displays the SMPTE Preamble and 
the metadata part of the Dolby-E frame in the Dolby-E section of the Audio Status 
display, while the metering information is used to generate the PPM display described on  
page 94. (The coded audio itself is not interpreted.) The Audio Status display also shows 
the line at which the Dolby frame commences to allow the user to verify that frames do 
not encroach upon the guard band. 
Display within the Audio Status Window 
Where the Dolby-E option is installed, the Dolby-E section of the Audio Status window 
displays the data included in the metadata segment of each Dolby frame, together with 
data read from the SMPTE 337 Preamble that precedes the burst.