? Integrated SCART buffers
The DOC system is designed to facilitate a ve ry cost effective TV chassis. Some of the measures taken
are:
? One crystal design. Only one reference crystal is required for the MPIF and ADOC,
? The advanced geometry corrections in the DOP result in a simple horizontal deflection circuitry.
Linearity coils are not required
12.9.2.Features of the ADOC Processor
Color Decoder and Sync Processing
? Multi standard color decoder supporting PAL -B, G, D, H, I, N, Combination -PAL N, PAL M, NTSC M,
NTSC-Japan, NTSC 4.43 and SECAM
? Automatic color standard re cognition and selection (PAL/SECAM/NTSC)
? Fully programmable static or Automatic Gain Control (AGC) for all analogue video base band signals.
? Resolution of CVBS or Y/C signal after AGC: 9 bits (including sync)
? AGC for chrominance (PAL and NTSC only) f or CVBS and Y/C sources
? Programmable clamp window for selected video base band signal(s)
? Horizontal (including 3 -level sync for 2Fh) and vertical sync detection.
? Adaptive 2/4-line delay Comb filter for two dimensional chrominance/luminance separation
? PAL delay line for correcting PAL phase errors
? Maskable interrupt generation to MIPS notifying any change of signal conditions
? Compliant with and detection of Macrovision up to version 7.1.
? Possibility of Fast Blank SCART RGB insertion in CVBS inp ut mode, not in Y/C.
? Second multi standard color decoder for low -cost PIP
- Supports CVBS standards as listed above
- No comb filter
- No Y/C performance (Y and C are being summed before decoding)
- No fast blanking with Component inputs
VBI Data Captur e
? Two independent data capture units (DCU1 and DCU2) for standard data rate streams
? Multi-standard data capture. Both DCUs can always execute the following services:
- Line 21 Data Services (Closed Caption)
- European Wide Screen Signalling (WSS line23 )
- PDC A & B (VPS and TeleText packet 8/30)
- World Standard TeleText.
? Services performed by TeleText application:
- Data Broadcast (packets X/30, X/31)
- Channel Identification (packet 8/30)
? Data type selectable on line -by-line basis independently fo r odd and even fields
? Multi-page acquisition during VBI
? Single page acquisition during full field
? DMA of packets and status bits to memory (embedded SRAM)
? Automatic identification of VBI data standard supported
Teletext storage
? Error correction and decoding performed by DOCware software
? Page management performed by DOCware software
? Storage of up to 8 pages of TeleText internally
? Storage of more than 8 TeleText pages requires external memory (SDRAM)
Picture measurements
? Noise measurement in active video
? Black Bar detection
? Sharpness measurement
Picture Improvements
? Field based noise reduction (on main only)
? Horizontal Dynamic Peaking/ Luminance Transient Improvement (LTI)
? SCAn VElocity Modulation (SCAVEM or SVM) and Dynamic Cont rast Control (DCC)
? Dynamic Color Transient Improvement (DCTI)
? Dynamic Skin Tone control
21
AK53 D.O.C. Service Manual 22/03/2004 |
ACEC
