Test Points and Waveforms, Signal Processing Board.
Test Points and Waveforms, Sync Generator Board
Schematic Diagram, Signal Processing Board
Printed Circuit, Signal Processing Board
Schematic Diagram, Sync Generator Board
Printed Circuit, Sync Generator Board
Parts List
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9
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Supplement
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Page 3
GENERAL DESCRIPTION
INTRODUCTION
SONY Model SEG-1 is a special-effects generator
with facilities for switching, fading, superimposing,
and wiping two video signals. Inputs accept up to
four SONY video cameras and provisions are included
to monitor the output of each camera.
may be inverted, if desired, to yield a negative picture. In addition, an internal sync generator supplies
2:l
interlace sync, or sync may be supplied from an
external source.
The SEG-1 may be used with any SONY video camera,
monitor, and/or Videocorder. Refer to the Owner’s
Instruction Manual for the complete operating procedure.
One channel
External sync:
Power requirements:
Power consumption:
Dimensions:
Weight:
Accepts vertical and hor-
izontal sync from
Series Videocorders or
vertical sync (-4V p-p)
from an external
sync generator. See pin
connections below.
117V, 60Hz 3-wire parallel
ground plug
7
watts
5
1/4" H
x 15 1/2" W x 10” D
8
½
lb.
CV-
2:l EIA
TECHNICAL SPECIFICATIONS
Camera video inputs:
Number of camera inputs:
Monitor video outputs:
Number of monitor outputs: 4, SO-239 UHF receptacle
Number of line outputs: 2, 1-Hirschmann 6 Pin
Internal sync:
1.0
-1.4V
7
5 n impedance.
must be supplied with
composite video.
4, Hirschmann 6 Pin
receptacle
1.0
upon input), sync negative,
75 Cl
2:l
SELECT switch is set to
INT.
p-p, sync neg.
-
1.4V p-p, (dependent
impedance
receptacle
1 -SO -239UHF
receptacle
interlace when SYNC
Input 1
CIRCUIT DESCRIPTION
,
VIDEO INPUT
Figure 1 shows the block diagram of the SEG-1.
Up to four cameras, either 4 CV-Series or 4 DXC-Series
#l
#4.
To de-
must al-
Each cam-
source-
B-
can be driven through Hirschmann connectors.
velop the sync pulse in the SEG-1, Camera
ways be connected with composite video signals, while
either composite -- or non-composite -- video signal
is acceptable through Camera #2,
era output can be monitored through four (4)
terminated SO-239 UHF receptacles.
Any combination of input selector switches is
accepted.
Video signals are balanced between A- and
channel by potentiometer
A-&+
““r”-
VRl..
#3
and
If the output video
Fig. 1. Block Diagram of SEG-1
1
Page 4
levels of A- and B-channel cameras are very different, the camera lens f-stop should be readjusted.
VIDEO
one-stage amplifier, Q2, is employed in channel B.
Gain and level adjustments are accomplished by
VR2 and VR3 respectively.
positive picture can be obtained on channel B by
means of SW-3.
DISSOLVE
INVERTER
To produce a negative picture, an inverting
Either a negative or a
by the two wipe one-shots are manipulated by resistor-transistor-logic
gate IC-2 and switches SW-6 to arrange the vertical,
horizontal and corner wipes.
CLAMPING
The video signal selected by mode switch SW-5
is clamped to ground during blanking time by Q5.
The horizontal blanking pulse includes front and back
porch, while the vertical blanking pulse has only a
back porch.
(RTL)
inverters IC-1, RTL NOR
The two selected signals are independently
attenuated by dissolve potentiometers VR4 and
VR5, mixed by R24 and
the FADE position, presented to the video amplifier.
WIPES
When mode switch
analog gates Q3 and Q4 switch rapidly between
the two selected channels in accordance with the
logic signals on their bases. The switched video
signals are mixed by
are arranged so that whenever one transistor is
turned on (turning off its video signal), the other
is turned off. This guarantees that one channel
or the other feeds the monitor at all times.
WIPE LOGIC
The logic signals that control these transistors
are derived from the horizontal and vertical sync
pulses.
multivibrator
mined by the setting of the horizontal wipe pot VR6.
At one extreme, a transition between channels is
produced at the left side of the screen.
other pot extreme, a long
duced that delays the transition until the right
side of the screen.
slower (O-16 ms.
produces variable width pulses, triggered by the
vertical pulse, for horizontal direction wipes.
using in combination independently adjustable pots
VR6 (horizontal wipe) and VR7 (vertical wipe) and
wipe selector switch, SW-6, it is possible to obtain
four corner wipes, as well as vertical and horizontal wipes.
Each horizontal pulse triggers a one-shot
(Q21/Q22)
Vertical wipe pot
The variable-duration pulses produced
R25
and, with
SW5-a
is set to WIPE,
R27
and R28. Logic signals
whose 0” time is deter-
(60~µs)
VR7
does a similar job at a
)
rate: Vertical one-shot
SW5-a
At the
pulse is pro-
in
Q23/Q24,
By
The horizontal blanking pulse is developed from
Camera #l and is a composite video signal.
separator Q8 produces mixed sync, which is a positive going 6 volt pulse.
multivibrator (Q 9
about 2 µs in front of the sync pulse to form the front
porch.
The sync pulses are delayed by Cl6 to form the
horizontal back porch.
mixed sync, horizontal back porch and the vertical
blanking pulse are added with diodes Dl
mixed blanking.
transistor, Q5.
VIDEO AMPLIFIER
A two-stage feedback amplifier
employed as the final stage.
impedance to drive two
from Camera
video amplifier.
CAMERA DRIVE
Two modes of camera drive, external and
internal, are available.
one interlace sync generator is installed which is
phase locked to either incoming vertical pulses
(through a Hirschmann male receptacle) or to
internal 60 Hz line frequency.
After the sync generator, both the horizontal
and the vertical pulses are shaped by
and
Ql7
-Q20 respectively. These pulse-shaping
amplifiers can drive a 19 (75 + 4) ohm load with a
4-volt negative-going pulse.
The following changes are incorporated into all SEG-1 Special-Effects Generators bearing
Serial No. 1523 and higher.
accommodate these changes. Refer to the revised schematic diagram and the SEG-1 Service Manual.
From Serial No. 2000 and higher, the Signal Processing Board has been redesigned as a
two-sided printed board. The Sync Generator Board has undergone minor changes in.
printed design as of the same serial number, and chassis modifications have been performed accordingly.
Minor modifications have been made to the circuit boards to
Details of the changes are given in the table below.
to the schematic diagrams.