Completar Frases
Complete the gaps
Two
reasons
why
cockpit
voice
recorders
store
data
using
solid
-
state
memory
instead
of
using
a
traditional
hard
disk
drive
:
1
.
Solid
-
state
memory
is
more
,
so
it
is
less
likely
to
be
in
a
crash
.
2
.
It
has
no
parts
,
so
it
is
less
likely
to
compared
to
a
drive
.
Audio
from
the
cockpit
is
sampled
at
a
rate
of
8000
Hz
and
16
bits
are
allocated
to
each
sample
.
How
many
kilobytes
would
be
needed
to
store
360
seconds
of
audio
?
Show
your
working
:
8000
samples
per
second
×
bits
=
128
,
000
bits
per
second
Convert
to
bytes
:
128
,
000
÷
=
16
,
000
bytes
per
second
For
360
seconds
:
16
,
000
×
=
5
,
760
,
000
bytes
Convert
to
kilobytes
:
5
,
760
,
000
÷
=
5760
KB
Explain
why
the
highest
audio
frequency
in
the
sampled
audio
from
the
cockpit
cannot
be
greater
than
4000
Hz
:
According
to
?
s
,
the
sampling
rate
must
be
at
least
the
frequency
.
With
a
sampling
rate
of
8000
Hz
,
the
highest
frequency
that
can
be
recorded
is
Hz
,
otherwise
it
will
be
measured
accurately
.
Light
enters
the
camera
through
the
and
is
focused
onto
a
chip
(
such
as
a
CCD
)
.
The
sensor
is
made
up
of
many
-
cells
,
each
of
which
detects
light
intensity
and
produces
an
signal
.
Each
signal
represents
a
in
the
image
.
An
-
to
-
converter
(
ADC
)
converts
these
signals
into
.
A
filter
is
used
to
produce
separate
values
for
red
,
green
and
blue
components
.
The
pixels
are
then
stored
as
a
grid
(
)
of
values
representing
the
image
.
To
compress
the
image
using
run
-
length
encoding
,
the
image
is
analysed
to
find
of
pixels
with
the
value
or
colour
.
Instead
of
storing
each
pixel
individually
,
the
system
stores
the
value
and
the
number
of
it
.
This
reduces
the
amount
of
needed
to
store
the
image
.
The
RFID
reader
emits
waves
.
These
waves
are
received
by
the
in
the
RFID
tag
,
which
enough
power
to
activate
the
tag
.
The
tag
contains
a
chip
that
stores
.
Once
powered
,
the
tag
the
stored
data
back
to
the
using
waves
.
Describe
the
principles
of
operation
of
a
bar
code
reader
,
excluding
the
use
of
the
check
digit
:
A
or
light
source
is
shone
onto
the
bar
code
.
The
beam
is
moved
the
bar
code
,
or
the
reader
is
moved
the
code
.
The
and
white
bars
reflect
different
amounts
of
,
with
reflecting
more
light
and
reflecting
less
.
A
light
sensor
(
such
as
a
or
)
detects
the
reflected
light
.
This
is
into
an
signal
,
which
is
then
into
data
.
The
data
is
processed
to
determine
the
encoded
in
the
code
and
sent
to
the
computer
or
till
system
.
Explain
the
purpose
of
the
check
digit
:
The
check
digit
is
used
to
that
the
code
has
been
entered
or
scanned
and
to
detect
.
How
the
software
in
the
bar
code
reader
will
use
the
check
digit
when
processing
a
product
:
The
first
digits
are
used
in
a
calculation
to
generate
a
.
This
calculated
value
is
then
with
the
check
digit
.
If
the
values
,
the
bar
code
is
and
processed
.
If
they
do
match
,
an
is
and
the
input
is
.
A
laser
printer
works
by
first
a
print
with
a
static
charge
.
A
beam
is
then
directed
onto
the
using
a
mirror
,
and
the
beam
is
switched
and
to
form
the
.
The
laser
removes
the
in
areas
where
the
image
should
.
charged
toner
is
then
to
the
charged
areas
of
the
.
The
is
transferred
onto
the
,
and
heated
rollers
the
onto
the
paper
,
creating
a
image
.
This
process
allows
a
laser
printer
to
print
a
whole
at
once
.
In
contrast
,
an
inkjet
printer
works
by
forcing
tiny
of
onto
the
paper
.
This
is
done
either
by
the
ink
to
form
a
bubble
or
by
using
a
piezoelectric
crystal
that
changes
shape
when
is
applied
.
This
forces
out
of
the
nozzle
.
The
print
moves
across
the
page
,
printing
line
by
line
.
Different
are
produced
by
combining
,
,
,
and
inks
.
The
ink
then
on
the
paper
.
Overall
,
laser
printers
use
charge
and
powder
,
whereas
inkjet
printers
use
ink
sprayed
onto
the
paper
.
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En esta actividad se deberan de ajustar las siguientes reacciones químicas