Service manual

VBI specifications
A-13
A
◆
VBI specifications
Teletext system B Data specifications
General Teletext B, according To ITU-R
Rec.653-2
Usable lines 625 lines systems 7 to 22, 320 to 335
Number of lines Maximum 16 lines per field
Delay relative to video Zero
Line code NRZ
Number of bits per line incl. run-in 360 bits
Frame word, byte 3 11100100
Output Specifications
Data positioning (rel. to sync ref.) Bit 13 at 12 ms ± 0.1 ms,
Data amplitude 0: Black level (±15 mV)
1: 462 mV (±40 mV)
Output bit rate 6.9375 Mbit/s ±25 ppm
Output eye-height > 95%
Output eye-width > 95%
Bandwidth limitation ≥ -3 dB, 6 MHz
≤ -12 dB, 6.75 MHz
≤ -40 dB, 8 MHz to 27 MHz
Teletext system C Data specifications
General Teletext C, according to CCIR
Rec.653-2
Usable lines 525 lines systems 10 to 22, 272 to 285
Number of lines 13 in field 1, 14 in field 2
Delay relative to video Zero
Line code NRZ
Number of bits per line including run-in 288 bits
Frame word, byte 3 11100111
Output Specifications
Data positioning (relative to sync reference) 10.48 ms ± 0.34 ms
Data amplitude 0: 0 IRE (±2 IRE)
1: 70 IRE (±6 IRE)
Output bit rate 5.727272 Mbit/s, 364 x line fre-
quency
Output eye-height > 90%
Output eye-width > 90%
VITC General Acc. To IEC 461
Usable lines 625 lines systems 6 to 22, 319 to 335
Usable lines 525 lines systems 10 to 20, 273 to 282
Number of lines ≤ 2 per field
Line code NRZ
Output Specifications
Data positioning (rel. to sync ref.) Half amplitude of first bit: 11.5 ms
±0.3ms
Data amplitude 625 lines systems 0: Black level (± 25 mV)