Panasonic EURO 4 Chassis, Техническое руководство

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Chapter 3 EURO 4H Supplement
2.4. CIP3250A (IC1502)
The CIP IC IC1502 contains the entire circuitry
required to interface analogue YUV and RGB signals
to a digital YUV signal. The fast blanking signal is used
to control internal switching between the digitised
luminance and chrominance signals and external
RGB signals.
The external RGB and fast blanking signal fed from
the 21 pin scart socket, (AV1 located on the E-Board),
is fed to the F-Board via connector F1 to the input of
the CIP IC IC1502.
Here the RGB signal is input via pins 63 (B), 65 (G)
and 67 (R), with the fast blanking pulse being input via
pin 61. These signals are then fed to an internal A/D
converter, digitising the input signals. The digitised
RGB signals are then fed to a matrix stage which
converts the digital RGB signals to digital YUV. These
digitised YUV signals then undergo signal correction
for brightness, contrast, saturation and hue as well as
being converted to 4:4:4 signal format before being
fed to a mixer stage.
The digitised luminance and chrominance signals fed
from IC1501 are input to IC1502 via pins 44-51 (luma)
and 36-43 (chroma).
The first stage these signals are fed is the format
conversion stage used to convert the input signal
format of 4:2:2 to 4:4:4 format for internal processing.
From this stage, this signal is also fed to the mixer
stage.
The mixer stage is used to select between the digital
YUV signal fed from the VPC IC1501 and the digitised
YUV signal produced from the RGB signal input to the
CIP, IC1502 (discussed earlier), this mixer stage
being controlled by the fast blanking pulse input via pin
61.
The selected YUV signal is then fed via the LPF to the
output format conversion stage. Here the signal
format of 4:4:4 used for internal processing is
converted to 4:2:2 format.
The resultant digital luminance signal is then output
via pins 10-17, while the digital chrominance signal is
output via pins 20-27. Both these signals are then fed
to IC1503 (SDA9401) for up-conversion.
To aid in the processing of the signals just discussed
the following signals are also reguired.