Wide Screen (Line 23) to Video Index Converter
 Supports AFD
 GPI control
 LCD Display
 RS232 / 422

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. There are currently two different signals used by UK broadcasters; Video Index (line 11) and Wide Screen
Signalling (line 23). We supply Generators and Decoders for both types of signalling. This datasheet covers only the
line 23 to Video Index Converter

Line 23 data:
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. The advantage of using the line 23 waveform is that it will pass through an analogue system and
be decoded either in the analogue or digital domain. Video Index may only be used in the digital domain. The
Microvideo Decoder is a digital decoder for line 23 carried in SDV.

The coding for the AFD is given as -

0 0 0 Active region same as coded frame (source material)
0 0 1 4:3
0 1 0 16:9
0 1 1 14:9
1 0 0 not used - reserved for future use
1 0 1 4:3 with shoot and protect 14:9 centre
1 1 0 16 : 9 with shoot and protect 14:9 centre
1 1 1 not used - reserved for future use

Video Input SDV(270Mb/s) as per SMPTE259M

Video Output 1 x SDV(270Mb/s) output (power-fail relay protected)

Data Interface Incoming WSS data, Coded image and AFD, can be displayed on the LCD.
Out going video index can be defined by either incoming WSS data or GPI inputs.
The GPIs are TTL level inputs, active low, on 9 way D type.
Standard Configuration :
GPI.1 Use WSS to define VI (1) or Use GPI to define VI (0)
GPI.2 Take input to latch the AFD - GPI's
GPI.3,GPI.4,GPI.5 - Sets the AFD information inserted.
(RS232 and RS422 interfaces available as an option. Contact MIcrovideo)

Physical The product is supplied in 1U rack mounting frame with integral psu.

Product Code WSS-VIG