Sanyo VPC-E6 Service Manual page 4

1-2. CP1 CIRCUIT DESCRIPTION
1. Circuit Description
1-1. Digital clamp
The optical black section of the CCD extracts averaged val-
ues from the subsequent data to make the black level of the
CCD output data uniform for each line. The optical black sec-
tion of the CCD averaged value for each line is taken as the
sum of the value for the previous line multiplied by the coeffi-
cient k and the value for the current line multiplied by the
coefficient 1-k.
1-2. Signal processor
1. γ correction circuit
This circuit performs (gamma) correction in order to maintain
a linear relationship between the light input to the camera
and the light output from the picture screen.
2. Color generation circuit
This circuit converts the CCD data into RGB signals.
3. Matrix circuit
This circuit generates the Y signals, R-Y signals and B-Y sig-
nals from the RGB signals.
4. Horizontal and vertical aperture circuit
This circuit is used gemerate the aperture signal.
1-3. AE/AWB and AF computing circuit
The AE/AWB carries out computation based on a 64-segment
screen, and the AF carries out computations based on a 6-
segment screen.
1-4. SDRAM controller
This circuit outputs address, RAS, CAS and AS data for con-
trolling the SDRAM. It also refreshes the SDRAM.
1-5. Communication control
1. SIO
This is the interface for the 8-bit microprocessor.
2. PIO/PWM/SIO for LCD
8-bit parallel input and output makes it possible to switch be-
tween individual input/output and PWM input/output.
1-6. TG/SG
Timing generated for 6 million pixel horizontal addtion CCD
control.
1-7. Digital encorder
It generates chroma signal from color difference signal.
2. Outline of Operation
When the shutter opens, the reset signals (ASIC and CPU)
and the serial signals ("take a picture" commands) from the
8-bit microprocessor are input and operation starts.
When the TG/SG drives the CCD, picture data passes through
the A/D and CDS, and is then input to the ASIC as 12-bit
data. The AF, AE, AWB, shutter, and AGC value are com-
puted from this data, and three exposures are made to obtain
the optimum picture. The data which has already been stored
in the SDRAM is read by the CPU and color generation is
carried out. Each pixel is interpolated from the surrounding
data as being either Ye, Cy, Mg or B primary color data to
produce R, G and B data. At this time, correction of the lens
distortion which is a characteristic of wide-angle lenses is
carried out. After AWB and γ processing are carried out, a
matrix is generated and aperture correction is carried out for
the Y signal, and the data is then compressed by JPEG and
is then written to card memory (SD card).
When the data is to be output to an external device, it is taken
data from the memory and output via the USB I/F. When played
back on the LCD and monitor, data is transferred from memery
to the SDRAM, and the image is then elongated so that it is
displayed over the SDRAM display area.
3. LCD Block
The LCD display circuit is located on the CP1 board, and
consists of driver (IC171). The video signals (YCrCb) from
the ASIC are input as 8-bit digital signals together with the
synchronization control signals (LCDCLK, LCDVD and
LCDHD). They are converted to RGB inside the driver and
output to the LCD panel. Furthermore, the driver has a built-
in DC/DC converter to generate the power supplies (8.5 V
and 5.5 V) that are necessary for the LCD.
4. Lens drive block
4-1. Iris drive
When the drive signals (IIN1 and IIN2) which are output from
the ASIC (IC101), iris motor is driven by the driver (IC956),
and are then used to drive the iris steps.
4-2. Focus drive
When the drive signals (FIN1, FIN2, FIN3 and FIN4) which are
output from the ASIC (IC101), the focus stepping motor is driven
by the driver (IC956). Detection of the standard focusing posi-
tions is carried out by means of the photointerruptor (FOCUS
PI) inside the lens block.
4-3. Zoom drive
When the drive signals (ZIN1, ZIN2, ZIN3 and ZIN4) which are
output from the ASIC (IC101), the zoom stepping motor is driven
by the driver (IC956). Detection of the standard zoom posi-
tions is carried out by means of photointerruptor (ZOOM PI)
inside the lens block.
4-4. Shutter drive
When the drive signals (SIN1 and SIN2) which are output from
the ASIC (IC101), it is driven regular current by the driver
(IC956).
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