Sharp 32LF-94EC, Service Manual, Page: 45 / 82

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AK53 D.O.C. Service Manual 22/03/2004
• Integrated SCART buffers
The DOC system is designed to facilitate a very 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 recognition 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) for 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 input 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 Capture
• 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 for 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 Contrast Control (DCC)
• Dynamic Color Transient Improvement (DCTI)
• Dynamic Skin Tone control