tracks
of
a disk storage device
that
can
be
accessed
without
repositioning the access mechanism.
daisy-chained cable. A type
of
cable
that
has
two
or
more
connectors
attached
in series.
data. (1) A
representation
of
facts, concepts,
or
instructions in a
formalized
manner
suitable for communication, interpretation,
or
processing
by
human
or
automatic means. (2)
Any
representations, such as characters
or
analog quantities,
to
which
meaning is,
or
might be· assigned.
data base. A collection
of
data
that
can
be
immediately accessed
and
operated
upon
by
a
data
processing system for a specific
purpose.
data processing system. A system
that
performs input, processing,
storage,
output,
and
control functions
to
accomplish a sequence
of
operations
on
data.
data
transmission. Synonym for transmission.
dB. Decibel.
dBa.
Adjusted
decibels.
dc.
Direct
current.
debounce.
(1)
An
electronic means
of
overcoming
the
make/break
bounce
of
switches
to
obtain
one
smooth
change
of
signal level. (2)
The
elimination
of
undesired signal variations
caused
by
mechanically
generated
signals from contacts.
decibel.
(1)
A unit
that
expresses the ratio
of
two
power
levels
on
a logarithmic scale. (2) A unit
for
measuring relative power.
decoupling capacitor. A capacitor
that
provides a low impedance
path
to
ground
to
prevent
common
coupling
between
circuits.
Deutsche Industrie Norm (DIN). (1)
German
Industrial Norm.
(2)
The
committee
that
sets
German
dimension standards.
digit. (1) A graphic
character
that
represents
an
integer; for
example,
one
of
the
characters 0
to
9. (2) A symbol
that
Glossary-9
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