Sony Ipels PCS-G50, Service Manual

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PCS-G50/G50P
3-2
(e) Communication terminal (PCS-PG50/PG50P) -
Data solution box: D-sub, 15-pin (Male)
Power:
A power of
+
19.5 V (DC) that is supplied from an AC
adapter to the PCS-PG50/PG50P is sent to the data solu-
tion box through a switch and fuse.
Microphone audio signal:
The microphone signal connected to the data solution box
is input to the PCS-PG50/PG50P through the microphone
amplifier in the data solution box.
Line audio signal:
The same signal as the LINE OUT signal of the PCS-
PG50/PG50P is input to the data solution box.
(f) Communication terminal (PCS-PG50/PG50P)
— Echo cancelling microphone (PCSA-A7): 8-
pin mini-square connector
Power:
A power of
+
12.0 V (DC) created by the DC/DC converter
from
+
19.5 V (DC) supplied from the AC adapter to PCS-
PG50.
The power of
+
12.0 V (DC) is supplied to the echo
cancelling microphone.
TX signal:
The TX signal is a multiplexed digital signal of LINE OUT
audio output, firmware of echo canceller, and control
commands from the PCS-PG50/PG50P to the echo
cancelling microphone, that is, an LVDS differential signal
(TX
±
).
RX signal:
The RX signal is a synthesized digital signal of multiple
microphone sounds that are put together from the micro-
phone with echo canceller through the echo canceller, and
synthesized status signals of the microphone.
The RX signal is input from the echo cancelling
microphone to the PCS-PG50/PG50P, that is, an LVDS
differential signal (RX
±
).
MICDET signal:
The MICDET signal is a detection signal for the cable
length (8 m or 1.5 m) from the echo cancelling microphone
to the PCS-PG50/PG50P.
For the long cable (8 m), (MICDET-GND) is connected.
3-1-2. Main Functions of Video
Communication System
(PCS-G50/G50P)
1. User interface functions
.
LED display of operation state
.
Reception and decoding of SIRCS signal from remote
commander
.
Creation and output of menu screen
.
Input and selection of video signal
.
Reception and demodulation of infrared video signal
(AV-Link)
.
Output of video signal (main and sub)
.
Output of video signal (individual area output for
multiple area meetings)
.
Input and selection of audio signal
.
Audio pickup using internal microphones
.
Output of audio signal
.
Function sound creation and output of ringer sound
.
Control of camera unit
.
Creation and transmission of SIRCS signal for monitor
control
.
Data read and write of Memory Stick
.
Control from external equipment in serial interface and
LAN interface
.
Input and selection of RGB signal (when using Data
solution box)
.
Output of RGB signal
.
Input of audio signal for echo cancelling microphone
(when using echo cancelling microphone PCSA-A7)
2. Functions for communication
.
Compression and coding of input video signal
.
Compression and coding of input audio signal
.
Creation of remote terminal control data
.
Multiplexing of video/audio/T.120 input data and
transmission framing of it to line
.
Line (ISDN/V.35) control and data transmission/
reception (when using ISDN unit)
.
LAN (100BASE-TX/10BASE-T) interface control and
data transmission/reception
.
Frame detection and separation of the reception data
from line and LAN
.
Execution of the control data from remote terminal
.
Decoding and expansion of audio data
.
Decoding and expansion of video data
.
Erasure of audio echo
.
Compression and coding of input RGB image (when
using Data solution box)
.
Decoding and expansion of reception RGB image (when
using Data solution box)