OutlineBVE-700 control panel unit
. The control panel unit performs the two main functions of generating key code and displaying received
BVE-700 processor unitdata from processor unit.
. When the main power is turned on, CPU automatically runs the boot ROM program. After copying theKey code is generated by a latch consisting of two ICs (IC303, IC304) on the key assembly and a buffer
program stored in flash ROM into RAM, CPU runs the copied program.IC (IC305).
This method is used because RAM has a faster access time than flash ROM.Key data is read from IC305 after setting an output from IC303 and IC304 to low. For example, when
Contents of flash ROM can be re-written by program loader using Ethernet.the output 1 of IC304 is set to low, all keys from ALL STOP key to FF key can be checked.
The knob operation data is obtained by reading IC201 and IC202 periodically. The dial operation data
. External VTRs and audio mixer are controlling using serial port on the CKG-27 board.is obtained by reading IC203 periodically.
The synchronous clock that is used to run the switcher hardware is generated from the externally
supplied sync signal by the SG circuit block on the CKG-27 board.. Data indication on display is realized by sending data to the respective circuit boards from CPU on the
IF-766 board in serial format.
. Five different types of HD SDI signals can be supplied from external source to the IO-193 board.20 ICs from IC401 on the key assembly to IC101 on the DP-309 board are connected in serial. When
These HD SDI input signals are converted from serial to parallel form and are then separated intodisplay data is sent from CPU, the display data is set to all of these ICs.
luminance (Y) signal and color difference (C) signal.If all display data are indicated on display all at the same time, not only power consumption exceeds the
Both the IO-193 board and the MIX-42 board process the luminance (Y) signal and color difference (C)power supply capacity but also efficiency is poor. Therefore, several ICs only are turned on and the
signal separately. The processed signals are converted back from parallel to serial signal as a single HDgroups of the illuminating ICs are switched one group after another. However, the ICs that become
SDI signal that is outputted from the IO-193 board. The IO-193 board has built-in color bar generatordark by the dynamic illumination method are turned on all the time as IC102. These ICs are connected
circuit that outputs the color bar signal.to the CPU bus through which parallel data are set.
The IO-193 board has the two output circuits. One contains the On Screen Display circuit with which
VTR timecode or setup menu data can be superimposed on the video output.. Power to the control panel unit is supplied from processor unit through D-sub 25-pin cable connected to
The video signal that is selected by the cross-point is outputted to the MIX-42 board.processor. The +12 V power that is supplied from processor unit is shifted to +5 V by DC-DC con-
verter on the IF-766 board.
. The MIX-42 board receives the four video input signals from the IO-193 board. These four video inputControl panel unit and processor unit are connected by RS-422A serial interface. Display data and
signals are Key Source, Key Fill, A bus and B bus signals. An output signal is generated from any ofcommands are sent to control panel unit from processor unit.
these four input video signals, and is returned to the IO-193 board.From control panel unit, data regarding the pressed key or data indicating the dial operation are sent to
The Key Source signal has the clip adjustment and gain adjustment functions.processor unit.
The A bus signal and the B bus signal have the Color Corrector function that can adjust luminance levelFrom processor unit, message is sent at the timing of every video field and control panel unit receives
and can correct color tone.message at the timing of every video field so that processing is executed in synchronism with the
The B bus signal has the mosaic function. Position and size of mosaic can be adjusted by synthesizingcorresponding video field.
B bus signal with mosaic effect into A bus signal using wipe effect. The MIX-42 board contains the
wipe pattern generator circuit.
. Switcher hardware is controlled by CPU that accesses the switcher through motherboard to which the
CPU bus is connected to the IO-193 board and the MIX-42 board.
5-25-2BVE-700 |
ACEC
