Page 147 - Electrical Engineering Dictionary

cold start (1) a complete reloading of the collinear geometry AOTF See collinear
system with no reassumption. All executed geometry acousto-optical tunable filter.
processes are lost.
(2) the starting of a computer system from collision (1)inapipeline, asituationwhen
a power-off condition. two or more tasks attempt to use the same
(3) the state from which a thermal genera- pipeline stage at the same time.
tion unit must be brought after being in cold (2) in a hash table, when n + 1 different
reserve. keys are mapped by a hashing function to
the same table index (where n entries can be
cold start miss in a cache, a cold start stored).
miss occurs when a computer program is ref-
erencing a memory block for the first time, collision broadening broadening of
so the block has to be brought into the cache the spectral profile of an amplifying or ab-
from main memory. Also called first refer- sorbing transition due to inelastic or phase-
ence misses or compulsory misses. When interrupting elastic collisions.
the cache is empty, all new memory block
references are cold misses. See also capacity collision vector a binary number in which
miss, conflict miss. the ith bit isa1if submitting a task into the
pipeline i cycles after a task will cause a col-
collapsible reel a take-up reel used in line lision.
work which fits on the power-take-off of a
line truck. color visual sensation associated with the
wavelengthorfrequencycontentofanoptical
collector wall the collector of a bipo- signal.
lar transistor is located below the surface of
the substrate. The wall, or sidewall, is the color blooming phenomenon where the
vertical boundary of the collector that meets excess charge at a photo receptor can spread
the substrate material. The boundary usually to neighboring receptors, and change their
forms a p-n junction that provides isolation values in proportion to the overload. For
from. RGB cameras, this effect can modify not
only the luminance but also the chrominance
collet a circular spring fingerstock con- of pixels. See color clipping, chrominance,
nection element for a power vacuum tube. luminance.

colliding-pulse-modelocked (CPM) laser color burst burst of eight to ten cycles of
a dye laser resonator design for producing the 3.579545 MHz (3.58 MHz) chrominance
femtosecond pulses; right and left travelling subcarrier frequency that occurs during the
pulses collide in a thin intracavity absorber. horizontal blanking of the NTSC composite
video signal. The color burst signal synchro-
collimated beam with nearly flat phase nizes the television receiver’s color demodu-
fronts and slow longitudinal variations of the lator circuits.
transverse amplitude distribution.
color clipping phenomenon where the in-
collinear geometry acousto-optical tun- tensityofthelightonaphotoreceptorexceeds
able filter acousto-optical tunable filter some threshold, the receptor becomes satu-
device where the acoustic and light waves rated and its response is no longer linear, but
propagate in the same direction. Also abbre- limited to some bound. For RGB cameras,
viated collinear geometry AOTF. this effect can modify not only the luminance

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2000 by CRC Press LLC