1.5. VIDEO DATA PATH
1.5.1. Transmission
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. If ECM is switched on (BRO only), the compressed
data then passes to the ECM memory, before it is sent to the telephone line
through the modem. If ECM is switched off, or in the BR1 which has no
ECM, the data passes to the modem through a FIFO memory.
Memory Transmission (BRO only):
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. If ECM is switched on, the compressed data then passes to
the ECM memory, before it is sent to the telephone line through the modem.
FCU
To the network
Original
Amplifier
Video
Processing
Memory
DRAM
ECM/SAF
Memory
DATA/ADDRESS BUS
FCIP
DIP
DCR
MDM
NCU
LED Array
Contact Image Sensor Assembly
Image Sensor
Amplifier
FIFO
Memory
DIP: Digital Image Processor
DCR: Data Compression & Reconstruction
MDM: Modem
H068V507.wmf
OVERALL MACHINE INFORMATION
August 7th, 1995
VIDEO DATA PATH
1-10
