Section 4 Circuit Operation Description - Sony UP-21MD Service Manual

Section 4
Circuit Operation Description
4-1. Digital Video Signal Processing Block
4-1-1. Outline
The main functions of the digital signal processing block on the VPR-74 board are as follows:
1. Converts a video input signal from analog to digital and stores it in memory (DRAM). (Capture)
2. Color-adjusts the image data stored in memory using a color adjustment circuit, and then converts the
data from digital to analog and outputs it to the analog signal processing block on the VPR-74 board
as a monitor output signal. (Monitor output)
3. Color-adjusts the image data stored in memory using a color adjustment circuit and then outputs it to
the head control block through a masking block as print data. (Print data output)
4. Converts a video input signal from analog to digital, converts the signal from digital to analog as it is,
and outputs it to the analog signal processing block as a monitor output signal. (Source output)
The digital signal processing block on the VPR-74 board consists of the following blocks.
* CPU block
* Memory (DRAM) block
* Memory control (ASIC) block
* Sampling clock generation block -
* Color adjustment block
* Masking block
{C603 and others
CLK LOCK
[Block Diagram]
SWD_HD '
DACLK
16902903 10905-9086
(6350-452
UP-21MD V1 4-1