WSS-GEN

Aspect Ratio Signalling Data¸¦ SDI¿¡ »ðÀÔÇØ ÁÖ´Â Àåºñ
PAL + ¹æ½Ä
ÀÔ·Â : SDI
Ãâ·Â : 2 x SDI (AUX, PGM)  

Features:

 Inserts line 23 - Aspect Ratio Data
 For UK DTTV applications
 Front panel or remote control
 Serial Digital Video interface (270Mb/s)
 Power fail by-pass relay

Aspect Ratio Signalling Data Inserter
In a broadcast system which is using both standard 4:3 and
wide screen (16:9) format pictures it is useful to label the
video signal with aspect ratio information. This allows equipment
in the transmission chain to know what the picture
format is. Microvideo supply Data Inserters and Decoders for
this Aspect Ratio Signalling.

The first half of line 23 is being used to carry aspect ratio information about the picture for systems with the capability of
having wide screen images. We are able to support two wide screen data signalling formats:

Specifications
Video in/out : Serial digital video (270Mb/s) to SMPTE259M (EBU Tech 3267-E)
Two SDV outputs; PGM out (has power fail relay bypass) and AUX out.

PAL Plus Data format :
Data is put on line 23 using Biphase coding with a clock frequency of 1.67MHz. This is low enough to be recorded by
consumer VCR's and decoded in the presence of noise. The data packet has a duration of 27.4uS. It consists of a sync
run in, data identification, followed by 14 Consumer Information Bits (CIB). These CIB's are sectioned into four groups;
Aspect ratio, Enhanced Services (Colour Plus), Subtitle formats and free(user bits). The Microvideo WSS-GEN inserter
supports programming of all these groups, including the recently defined surround sound bit, bit 11.

Active Format Descriptor for Digital Terrestrial :
The waveform used is of the same specification as PAL Plus but the 14 bits of data are interpreted differently. They are
used to convey the source aspect ratio (4:3 or 16:9) and the active format descriptor (AFD) that is required for digital
terrestrial systems. This data is similar to that transported by Video Index signalling (See Microvideo Video Index
Inserter datasheet).


                   

 
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