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FACSIMILE SYSTEM
5. FLOW OF IMAGE SIGNALS
5.1
Transmission
(1) Images are read by the contact sensor, and the resulting analog image
(2) The analog image data that arrives from the contact sensor undergoes
(3) The system controller converts the digital image data from serial to
(4) In the memory transmission mode, the coded digital image data is con-
(5) The MPU transfers the data in DRAM buffer area to the MODEM one
(6) After the data has been modulated, it is amplified by the 2-wire/4-wire
6–22
data is sent to the SCNT board.
digital image data conversion, error diffusion processing or other pro-
cessing on the image processor IC of the reading control section. The
resulting image data is sent to the system controller by serial commu-
nications.
parallel and writes the data to DRAM.
In memory transmission mode, the
in DRAM by the CODEC, and writes the resulting data to DRAM
again.
verted to raw data on the MPU. After this, coding according to the
transmission mode is performed, and the resulting data is written to
buffer area in DRAM.
In the direct transmission mode, the MPU codes the raw data in
DRAM matched to the transmission mode, and writes the resulting
data to buffer area in DRAM.
byte at a time in response to requests from the MODEM. When the
data arrives, the MODEM performs modulation.
conversion circuit on the NCU board, and is sent to the telephone line
from L1 and L2.
MPU
codes the digital image data
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