Daewoo dsc-3220e-3220l Manuel D’Utilisation

-20-

  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