Video Data Path - Ricoh D197 Service Manual

Video Data Path

5.3 VIDEO DATA PATH
5.3.1 TRANSMISSION
Memory Transmission and Parallel Memory Transmission
The base copier's scanner scans the original at the selected resolution in inch format. The IPU
processes the data and transfers it to the FCU.
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When scanning a fax original, the IPU uses the MTF, independent dot erase and
thresholding parameter settings programmed in the fax unit's scanner bit switches, not
the copier's SP modes.
Then, the FCU converts the data to mm format, and compresses the data in MMR or raw format to
store it in the SAF memory. If image rotation will be done, the image is rotated in page memory
before compression.
At the time of transmission, the FCU decompresses the stored data, then re-compresses and/or
reduces the data if necessary for transmission. The NCU transmits the data to the line.
D3A5 196 SM