OmniTek 2.3 manual Smpte 337 Preamble, Guard Band Position, Dolby-E Frame, Sync Segment

Note: In all, an extensive amount of information can be displayed. If simply opening and closing sections of the hierarchy doesn’t give you the display you need, you can ‘filter’ the information down to just those items you are interested in (and save the filtering you select). This is described in the section starting on page 119.

SMPTE 337 Preamble

The section relating to the SMPTE 337 Preamble displays the following information:

Sync word 1 For data burst containing 16-bit Dolby-E data, this should be 0xF872 For data burst containing 20-bit Dolby-E data, this should be 0x6F872 For data burst containing 24-bit Dolby-E data, this should be 0x96F872

Sync word 2 For data burst containing 16-bit Dolby-E data, this should be 0x4E1F For data burst containing 20-bit Dolby-E data, this should be 0x54E1F For data burst containing 24-bit Dolby-E data, this should be 0xA54E1F

Bit depth	16-, 20- or 24-bit
Burst	Data Type	28 (for Dolby-E)
information	Data mode	0 for 16-bit; 1 for 20-bit; 2 for 24-bit
	Error flag	1 if the data may contain errors
	Data type, Data stream number	Both 0 for Dolby-E
Length code	Unsigned integer giving the number of data bits burst payload. Limited to
	65535 for 16-bit data; 1048575 for 20-bit data; 16777215 for 24-bit data

Guard Band Position

The video line at which the Dolby frame was found to start. This line number will be shown in red if any frame since the last reset has been found to start outside the Guard Band. (The frame(s) with this error can be found by studying the log.) With the “Errors” showing the total number of Guard band Position errors since the last reset.

Dolby-E Frame

The remainder of the Dolby-E display comprises the data within the metadata section of the Dolby frame, together with the results of some validity checks that can readily carried out on this data. In particular, OmniTek XR reports discontinuities in frame count, invalid time codes and CRC errors.

The range of information transmitted as Dolby-E Metadata is very extensive. However, the names used for the items follows the naming used in the Dolby specification, so detailed information about the individual elements shown within any section may obtained by studying the Dolby specification. The following description just gives brief information about the different sections of this data.

Sync Segment

This is the part of the Dolby-E frame that is used to establish synchronization. It includes a sync word, together with details of the bit depth and a flag indicating whether bitstream keys are used in the frame.

The following table shows the sync word that should be used in the different cases:

Bit Depth	Key Present	Sync Word
16	False	0x078E
	True	0x078F
20	False	0x0788E
	True	0x0788F
24	False	0x07888E
	True	0x07888F

OmniTek XR User Guide, Software Release 2.3 Page 101