LSP

EP

BP

TCS

(interlaced)

TCS

(interlaced)

TCS

(non-interlaced)

0

0

0

2.33

4.66

32 34.33

32

27.33

59.33 64

64

64

All timings in

µs

621

(308)

622

(309)

623

(310)

624

(311)

625

(312)

12

345

6

309

310

311

312

313

314

(1)

315

(2)

316

(3)

317

(4)

318

(5)

319

(6)

308

309

310

311

312

1

2

3

4

5

6

The number positions indicate the end of lines.

The Teletext composite synchronization signal (TCS), whether interlacing is present or not, comprise

three components.

a) the line-synchronization pulses (LSP).

b) the equalization pulses (EP)

c) the frame-synchronization pulses (BP).

The timing reference is specified by the descending edge of the signal LSP, with a tolerance spread of

± 100ns.

Figure 4 : Composite Sync. Waveforms

0

4.66

0

16.67

64

56.67

312

291

41

0

40

µs

display period

lines 42 to 291 inclusive

(and 355 to 604 inclusive interlaced)

display period

LSP (TCS)

R.G.B.Y (1)

R.G.B.Y (1)

A) LINE RATE

B) FIELD RATE

All timings in

µs

Line numbers

(1) Also BLAN in charac ter and box bla nking

Horizontal directio n(line ) - Vertical direc tion (frame)

Figure 5 : Display Output Timing

STV5345 - STV5345/H - STV5345/T

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