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July 24th, 1996
1.5. VIDEO DATA PATH
1.5.1. Transmission
DIP:Digital Image Processor
DCR:Data Compression &
Reconstruction
Immediate Transmission:
Scanned data from the contact image sensor passes to the DIP block in the
FCIP. After analog/digital video processing, the DCR block compresses the
data for transmission. The compressed data then passes either to the FIFO
memory or to the ECM memory before it is sent to the telephone line through
the modem.
Memory Transmission:
First, the scanned data is stored in the SAF memory after compression in the
DCR block.
At the time for transmission, the DCR block decompresses the data from the
SAF memory, then compresses it again after handshaking with the other ter-
minal is done. The compressed data then passes either to the FIFO memory
or to the ECM memory, before it is sent to the telephone line through the mo-
dem.
Original
Contact Image Sensor
Assembly
LED Array
CIS Video
Amplifier
DIP
Video
FCIP
Processing
Memory
DCR
DATA/ADDRESS BUS
DRAM
Line
SAF IC
Buffer
ECM/SAF
Card
/FIFO
Memory
Memory
1-11
OVERALL MACHINE INFORMATION
VIDEO DATA PATH
Image Sensor
FCU
Amp
R144EFXL
Modem
Attenuator
HIC
NCU
To the
network
H528v507.wmf
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