1.5. VIDEO DATA PATH
1.5.1. Transmission
Immediate Transmission:
Scanned data form 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.
FDU
FCE
DRAM
Video
Processing
Memory
Amplifier
Attenuator
Line
Buffer
/FIFO
Memory
ECM/
SAF
Memory
NCU
Amplifier
MDM
FCIP
DATA/ADDRESS BUS
HIC
To the network
Original
Image Sensor
Xenon Lamp
Contact Image Sensor Assembly
DCR
DIP
DIP: Digital Image Processor
DCR: Data Compression and Reduction
MDM: Modem
H521V507.wmf
OVERALL MACHINE INFORMATION
May 22nd, 1995
VIDEO DATA PATH
1-14