OmniTek 2.3 manual Display within the Audio Status Window, Ntsc

Video Frame

Dolby E Frame

Guard Band

Video Frame

Dolby E Frame

Guard Band

Video Frame

Dolby E Frame

Guard Band

NTSC		512	513	525	1
		Line	Line	Line	Line
	Approx. end of
	Dolby E Frame
PAL
		Line	Line			Line	Line
		603	604			625	1

Line	Line	Line	Line	Line
10	13	14	512	513

Switching			Dolby E		Approx. end of
		Reference
Area					Dolby E Frame
			Position
	Line		Line	Line		Line	Line
	6		13	14		603	604

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.

Page 100 OmniTek XR User Guide, Software Release 2.3