Daewoo DSC-3220E/3220L service manual

Service manual SC-150

High-level command language FLOF (Fastext), and TOP support 10 pages memory on chip (10kB)

4-1-5- Display OSD Features 3kB OSD RAM on chip WST level 1.5 compliant WST level 2 parallel attributes

32 foreground/background colours programmable colour look-up table 1024 mask programmable characters 17 national languages

(Latin, Cyrillic and Greek caracter sets) Character matrix 10x10

4-color mode for user font

4-1-6- Audio Features Three mono inputs Two mono outputs Programmable channel select

Volume control for one mono channel

4-1-7- General Features Submicron CMOS technology Low-power standby mode Single 20.25 MHz crystal 64-pin PSDIP package

4-1-8- Data Capture

The Video Front End section takes in the analogue Composite Video 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 select and convert the analogue CVBS signal into a digital form. This is done using 8 bit ADC sampling at 20.25 Mhz.

The digital data services transmitted in the VBI are selected and acquired separately form the video part. This is done by the use of an adaptive data slicer. The following data types can be extracted : 625 line World System Teletext (WST), VPS, WSS. The data is acquired and decoded by the teletext decoder (TPU), then stored in an SRAM lnterface.

4-1-9- Data Capture Features Video Signal Quality detector Data Capture for 625 line WST

Data Capture for VPS data (PDC system A)

Data Capture for Wide Screen Signalling (WSS) bit decoding

Real-time capture and decoding for WST Teletext in Hardware, to enable optimised microprocessor throughput 10 page memory stored On-Chip

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