Daewoo DWP-28W2ZZF Service Manual download pdf (Page 29)

Appendix Service manual WP-795

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Data Capture

Text memory 10 pages

Inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page

Table (SPT)

Data Capture for US Closed Caption

Data Capture for 525/625 line WST, VPS (PDC system A) and Wide Screen Signalling (WSS) bit

decoding Automatic selection between 525 WST/625 WST

Automatic selection between 625 WST/VPS on line 16 of VBI

Real-time capture and decoding for WST Teletext in Hardware, to enable optimised

-processor

throughput

Automatic detection of FASTEXT transmission

Real-time packet 26 engine in Hardware for processing accented, G2 and G3 characters

Signal quality detector for video and WST/VPS data types

Comprehensive teletext language coverage

Full Field and Vertical Blanking lnterval (VBI) data capture of WST data

Display

Teletext and Enhanced OSD modes

Features of lever 1.5 WST and US Close Caption

Serial and Parallel Display Attributes

Single/Double/Quadruple Width and Height for characters

Scrolling of display region

Variable flash rate controlled by software

Enhanced display features including overlining, underlining and italics

Soft colours using CLUT with 4096 colour palette

Globally selectable scan lines per row (9/10/13/16) and character matrix [12x10, 12xl3, 12x16 (VxH)]

Fringing (Shadow) selectable from N-S-E-W direction

Fringe colour selectable

Meshing of defined area

Contrast reduction of defined area

Cursor

Special Graphics Characters with two planes, allowing four colours per character

32 software redefinable On-Screen display characters

4 WST Character sets (GO/G2) in single device (e.g. Latin, Cyrillic, Greek, Arabic)

G1 Mosaic graphics, Limited G3 Line drawing characters

WST Character sets and Closed Caption Character set in single device

Data Capture

The Data Capture section takes in the analogue Composite Vidéo and Blanking Signal (CVBS), and from

this extracts the required data, which is then decoded and stored in memory.

The extraction of the data is performed in the digital domain. The first stage is to convert the analogue

CVBS signal into a digital form. This is done using an ADC sampling at 12MHz. The data and clock

recovery is then performed by a Multi-Rate Video Input Processor (MuIVIP). From the recovered data

and clock the following data types are extracted WST Teletext (625/525), Closed Caption, VPS, WSS.

The extracted data is stored in either memory (DRAM) via the Memory Interface or in SFR locations.

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Daewoo DWP-28W2ZZF Service Manual Page 29

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