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Sanyo VPC-R1E Service Manual page 5

Digital camera ac adaptor
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1-2. CA-B CIRCUIT DESCRIPTION
1. Circuit description
1-1. PTG
This is program timing generator. Generates the timing signal
that is needed in order to drive the FT-CCD sensor.
1-2. FCP
The FCP receives the output data from the FT-CCD sensor
via the PTG, and then carries out various processing opera-
tions on the data (such as gamma correction and white
banance).
1-3. ITP
The ITP is a pixel conversion processor. It carries out various
processing operations (such as contour emphasis and chroma)
on the image data that is input from the FCP or from memory,
and then stores the processed data in memory.
1-4. CPU
This is 32 bit RISC CPU.
1-5. Memory controller
This is controlled SDRAM, flash ROM and CF card etc.
1-6. Video player
Outputs the RGB signals that are needed to control the graphic
overlay function and to drive the LCD.
1-7. GPIO
This is a multipurpose I/O. (It can be used as an input/output
port.)
1-8. COM port
This is communication block. Supports USB communication.
1-9. Serial communication
This is the interface for the 8-bit microprocessor.
1-10. LCD driver
The RGB output signals that are output from the ASIC are
converted to a signal level that is appropriate for the LCD moni-
tor.
1-11. LCD monitor
This is the image display device which displays the image
signals supplied from the LCD driver.
2. Outline of Operation
When the shutter opens, detect the 8-bit microprocessor and
transmit to record operation starts.
When the PTG drives the FT-CCD, picture data passes
through the A/D and is then input to the ASIC as 10-bit data.
This data then sends FCP, after which it is carried out various
processing operations on the data (such as gamma correc-
tion and white balance). The data is then sent to the ITP where
processing such as contour emphasis and chroma are car-
ried out, after which it is temporarily stored in the SDRAM.
In case of still picture the data is then compressed by the
JPEG method and in case of picture it is compressed by
MJPEG method and is written to compact flash card.
3. LCD Block
RGB signals corresponding to the LCD driver are output from
the ASIC (video player). The LCD driver converts the RGB
signals that are output from the ASIC to a signal level that is
appropriate for the LCD monitor. These RGB signals and the
control signal which is output by the LCD driver are used to
drive the LCD panel.
The RGB signals are 1H transposed so that no DC compo-
nent is present in the LCD element, and the two horizontal
shift register clocks drive the horizontal shift registers inside
the LCD panel so that the 1H transposed RGB signals are
applied to the LCD panel.
Because the LCD closes more as the difference in potential
between the VCOM (common polar voltage: fixed at DC) and
the R, G and B signals becomes greater, the display becomes
darker; if the difference in potential is smaller, the element
opens and the LCD become brighter. In addition, the bright-
ness and contrast settings for the LCD can be varied by means
of the serial data from the ASIC.
– 5 –

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