Canon imageFORMULA P-215 Service Manual page 38

CHAPTER 2 FUNCTION & OPERATION
Analog signals proportionate to the
density of each picture element are output to
the analog processor on the control PCB
from the CIS unit. The resolution of the
output data is either 300 dpi or 600 dpi ac-
cording to the user settings.
The analog processor carries out offset
adjustment, gain adjustment, and A/D con-
version. Analog signals are converted into
12bit digital signals in the analog processor.
Then the image data is transferred to the
scanner controller and converted from 12
bits to 8 bits.
After that, the image data is output to the
computer through USB interface. The USB
cable used for this machine is a special
cable with a USB3.0 standard A type con-
nector on the computer-side and a USB2.0
micro B type connector on the device side.
The signal speed
Hi-speed.
The computer performs the image
processing according to the user settings
after the signal rearrangement, resolution
conversion and shading correction.
Since this machine has a white back-
ground, black border removal and punch
hole removal are not necessary.
2-16
supports USB2.0
COPYRIGHT © CANON ELECTRONICS INC. 2011 CANON P-215 FIRST EDITION