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In the MPEG encoder module, the video/audio signals are
converted into the compressed data, and it is multiplexed
and input again to the FPGA as the MPEG stream.
The Wireless ID is added to this MPEG stream, and the
MPEG stream is input to the OFDM modulating device
(IC307) and modulated to the OFDM (Orthogonal Fre-
quency Division Multiplexing) signal.
The OFDM signal is input to the transmitter as the IF
signal of 9.14 MHz whose band is restricted in BPF
(IC401, 402). Then, the signal is upconverted into the set
frequency (2.4 GHz band), and is sent with the nondirec-
tional antenna.
1-5-2. System Control (IF-914 Board)
The 32-bit microcomputer (IC101) on the IF-914 board
controls the WLL-CA50 system. The program of the
microcomputer is stored in the 16-bit flash memory
(IC105) and two 1M-bit SRAMs (IC109, 110) are used as
the work memories. The NV RAM (IC112) backs up the
unit settings just before the unit is powered off.
The camcorder performs the serial communication with the
microcomputer on the IF-914 board through the 40-pin
interface. The signal level from the camcorder to the
microcomputer is 0 to +2.5 V, and the signal level from
the microcomputer to the camera is +2.5 ± 5 V. By this
communication, the output direction of the video/audio
signals in the 40-pin interface, the confirmation for the
video format (NTSC/PAL) of the camcorder, the periodical
checks of the camcorder operations (VTR stop/PB/REC)
are performed.
The microcomputer performs the following controls for the
parts in the unit.
For the FPGA (IC200/DPR-231 Board), sets the video
format (NTSC/PAL) and the Wireless ID.
For the MPEG encoder module, sets parameters such as
the encode rate.
For the OFDM modulating device (IC307/DPR-231
Board), sets the modulation method and CW (single tone
without modulating) output.
For the transmitter, sets the output level and the frequency
(For CE and J models: 2406 to 2478 MHz. For UC model:
2406 to 2470 MHz), and detects the abnormality such as
the PLL unlock of the transmitter.
For the EL display unit, sends the character information.
For the rotary encoder for selecting menu, checks the
rotating direction and the number of rotation.
1-4 (E)
The connecter CN101 on the IF-914 board is used for the
upgrade of the control program.
When the ROM board that the program is saved in is
connected to CN101, the microcomputer reads the data and
sends it to the flash memory (IC105).
1-5-3. Power Supply Block (PS-645 Board)
The power of the WLL-CA50 is supplied from the follow-
ing connectors. When a connector is externally inserted
into the DC IN connector, the DC IN is automatically
selected.
. DC IN connector (XLR 4-pin)
. BATT IN connector (5-pin)
The selected power is called the UNREG in the unit. The
UNREG is supplied to the WILL-CA50 as well as to the
camcorder through the BATT OUT connector.
Q10 on the PS-645 board turns On/Off the UNREG to be
supplied to the WLL-CA50. Q10 is controlled by the DC
LINE switch.
The UNREG through Q10 is sent to the following voltag-
es:
. DC OUT connector
. +3.3 V/+2.5 V regulator
. +5 V/+1.8 V regulator
. +9 V/_5 V regulator
Following the +3.3 V regulator, other regulators are
designed to start up.
These regulator outputs are supplied to each part of the
unit.
The PS-645 board contains the transmitter.
The transmitter receives the power and the control signal at
the Wn traces on the PS-645 board.
The signal of the transmitter is input from the MB-998
board to the transmitter through the coaxial cable, and is
output from the N-type connector to the antenna.
WLL-CA50
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