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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
Guard Band
Guard Band
Guard Band
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.