2-3
BVP-500
BVP-500P
PR-211 board
The PR-211 board converts the analog R, G, and B video
signals into digital signals with an analog-to digital
converter having sampling/holding functions.
It generates clocks required for the analog-to-digital
conversion and the digital processings from the clocks
generated by the OHB.
In addition, the PR-211 board adds a linear matrix and
detail signals to the analog-to-digital converted R, G and B
signals.
It performs the processings such as pedestal control,
gamma correction, knee correction and white clipping for
the signals. It also performs the followings.
• Generates an internal color-bar signal and switches
between this signal and the main line signals.
• Creates detail and aperture signals from digital R and G
signals.
• Creates a skin tone singal.
• Detects signals for an auto iris, flare compensation,
DCC, and auto white/black balancings.
• Detects black/white shadings, generates a waveform to
compensate them and outputs the wavefoem to the VA-
163 board.
• Detects black levels and outputs the feedback clamp
voltage to the VA-163 board.
• Generates TEST SAW waveforms and outputs them to
the VA-163 board.
The video signals that has thus been digital-processed, are
then converted to the Y, R-Y and B-Y signals and are
output to the DA-88 board. The Y/C signals are generated
from the Y, R-Y and B-Y signals with a color encoder IC
on the PR-211 board. These signals, that were sampled at
36-MHz rate and quantized by 10 bits, are digital-to-analog
converted.
And the resultants are then output to the DA-88 board as a
monochrome signal for VF, wide-band luminance signal,
or modulated chroma signal. The monochrome signal for
VF has a zebra signal for level indication, and character
signal and center marker signal mixed on it.
DA-88 board
The monochrome signal for VF (VF Y) sent from the PR-
211 board goes through a lowpass filter and is output to the
IF-538 board. The wide-band luminance signal Hi-Ys is
output via a lowpass filter to the MD-103 board. The
modulated chroma signal C goes through a black clamp
circuit and lowpass filter and is added to the Hi-Ys. The
resultant is output to the IF-538 board as a VBS signal.
The Y, R-Y and B-Y signals, that are input from the PR-
211 board as the digital video signals, are aligned in phase
with video signals in another channels by a digital delay
line. The resultant is digital-to-analog converted and is
then output via a lowpass filter and black clamp circuit to
the IF-538 board. On the other hand, an analog component
signal is generated in combination with the above-men-
tioned Hi-Ys signal, R-Y and B-Y signals. The analog
component signal is controlled, on the level adjustment and
reference signal addition, by the AT-95 board according to
equipment connected to the camera (VTR or CCU). The
analog component signal is output to the MD-103 board
via the MB-637 board.
IF-538 board
Input signals at the IF-538 board are as follows;
Signals from the DA-88 board: VF Y, VBS, Y, R-Y and B-
Y
Signals from external equipment: Reference signal for
external synchronization, Return video signal
By combination with these signals, the IF-538 board
outputs the following signals.
•
VTR VBS OUT signal
The input VBS signal is output via the buffer amplifier
to the MB-637 board. This is used to output for the VTR
connector (26P) of the standalone unit BKP-5910/5910P
only when the standalone unit is installed in the camera.
2-3. Circuit Description
Summary of Contents for BVP-500
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