无线遥控器怎样工作外文翻译Word文档下载推荐.docx
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无线遥控器怎样工作外文翻译Word文档下载推荐.docx
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devices
applications
is
increasing.
Cable
connect
relative
advantage
low
installation
costs
(no
wiring,
no
underground
works,
there
trough),
increased
flexibility
reduced
maintenance
costs.
Remote
Control
Category
system
type
classification
many,
main
methods
are:
①
directives
by
carrier
signal
divided
into:
radio
ultrasonic
control;
②
encoding
accordance
sub-signals:
frequency
pulse
code;
③
channel
single-channel
multi-channel
④
according
same
time
number
instructions
can
be
transmitted
⑤
command
signals
technology
was
as
follows:
switch-type
proportion
control.
component
general
transmitter
receiver
composed
two
parts.
General
key,
instruction
circuit,
modulation
driver
firing
such
a
few
Instruction
circuit
produce
signal,
then
carried
out
drive
power
amplifier
launch
after
encoding.
Receiver
receiving
amplifier,
demodulator
circuits,
decoder
implementation
several
Transmitter
circuits
will
launched
coding
have
been
modulated
down
reception
demodulation
made
major
evacuation.
Demodulation
transferred
development
coding,
that
is,
restore
for
Encoding
decoding
signals,
finally
operation
variety
commands.
Applications
The
use
non-visible
light
communications
obvious
shortcomings:
On
one
hand,
not
obstacles
between,
on
other
effective
range
limited.
For
cables
or
infra-red
system,
receiver'
s
direction
distance
greater
restrictions.
provide
best
movement.
Now
through
application
most
advanced
data
removed
from
design
complicated
work.
Industry
two-way
modem
transmit
digital,
analog,
serial
CAN
reach
300m.
modems
433Hz
DECT
based
the.
Can
used
fine-tune
device
fast
flexible
meet
specific
requirements
client
Complete
configuration
secure
different
many
fields
transfer
tasks.
sector
environment
has
an
increasing
possible.
Area
plant
utilities
doors,
door-shaped
frame,
lift
cabinets,
lighting
platform.
In
industry,
machine
device,
press
ground
air
delivery
systems,
dynamic
storage.
construction
road
agriculture
also
work
more
smoothly
IntroductiontoHowRemoteControlsWork
Theworld'
sfirstremotecontrolswereradio-frequencydevicesthatdirectedGermannavalvesselstocrashintoAlliedboatsduringWWI.InWWII,remotecontrolsdetonatedbombsforthefirsttime.Theendofthegreatwarsleftscientistswithabrillianttechnologyandnowheretoapplyit.Sixtyyearslater,someofusspendanhourlookingfortheremotebeforeweremembertherearebuttonsontheTV.Inthisarticle,we'
llexaminetheinfraredtechnologyusedinmosthometheaters,lookatthedifferencebetweenIRandRFremotes,findoutthedifferencebetweena"
universal"
anda"
learning"
remoteandcheckoutsomeoftheotherhigh-techfeaturesyoucanfindonremotestoday,likePCconnectivity,RFextendersandmacrocommands.
InfraredRemoteControls:
TheProcess
Pushingabuttononaremotecontrolsetsinmotionaseriesofeventsthatcausesthecontrolleddevicetocarryoutacommand.Theprocessworkssomethinglikethis:
1.Youpushthe"
volumeup"
buttononyourremotecontrol,causingittotouchthecontactbeneathitandcompletethe"
circuitonthecircuitboard.Theintegratedcircuitdetectsthis.
2.Theintegratedcircuitsendsthebinary"
commandtotheLEDatthefrontoftheremote.
3.TheLEDsendsoutaseriesoflightpulsesthatcorrespondstothebinary"
command.
Oneexampleofremote-controlcodesistheSonyControl-Sprotocol,whichisusedforSonyTVsandincludesthefollowing7-bitbinarycommands:
Button
Code
1
0000000
2
0000001
3
0000010
4
0000011
Channelup
0010000
Channeldown
0010001
Poweron
0010101
Poweroff
0101111
Volumeup
0010010
Volumedown
0010011
Source:
ARRLWeb
Theremotesignalincludesmorethanthecommandfor"
volumeup,"
though.Itcarriesseveralchunksofinformationtothereceivingdevice,including:
•a"
start"
command
•thecommandcodefor"
•thedeviceaddress(sotheTVknowsthedataisintendedforit)、
stop"
command(triggeredwhenyoureleasethe"
button)
Sowhenyoupressthe"
buttononaSonyTVremote,itsendsoutaseriesofpulsesthatlookssomethinglikethis:
SonyTVremotesuseaspace-codingmethodinwhichthelengthofthespacesbetweenpulsesoflightrepresentaoneorazero.
WhentheinfraredreceiverontheTVpicksupthesignalfromtheremoteandverifiesfromtheaddress
codethatit'
ssupposedtocarryoutthiscommand,itconvertsthelightpulsesbackintotheelectricalsignalfor0010010.Itthenpassesthissignaltothemicroprocessor,whichgoesaboutincreasingthevolume.The"
commandtellsthemicroprocessoritcanstopincreasingthevolume.
Infraredremotecontrolsworkwellenoughtohavestuckaroundfor25years,buttheydohavesomelimitationsrelatedtothenatureofinfraredlight.First,infraredremoteshavearangeofonlyabout30feet(10meters),andtheyrequireline-of-sight.Thismeanstheinfraredsignalwon'
ttransmitthroughwallsoraroundcorners--youneedastraightlinetothedeviceyou'
retryingtocontrol.Also,infraredlightissoubiquitousthatinterferencecanbeaproblemwithIRremotes.Justafeweverydayinfrared-lightsourcesincludesunlight,fluorescentbulbsandthehumanbody.Toavoidinterferencecausedbyothersourcesofinfraredlight,theinfraredreceiveronaTVonlyrespondstoaparticularwavelengthofinfraredlight,usually980nanometers.Therearefiltersonthereceiverthatblockoutlightatotherwavelengths.Still,sunlightcanconfusethereceiverbecauseitcontainsinfraredlightatthe980-nmwavelength.Toaddressthisissue,thelightfromanIRremotecontrolistypicallymodulatedtoafrequencynotpresentinsunlight,andthereceiveronlyrespondsto980-nmlightmodulatedtothatfrequency.Thesystemdoesn'
tworkperfectly,butitdoescutdownagreatdealoninterference.
Whileinfraredremotesarethedominanttechnologyinhome-theaterapplications,thereareotherniche-specificremotesthatworkonradiowavesinsteadoflightwaves.Ifyouhaveagarage-dooropener,forinstance,youhaveanRFremote.
Remote-controlFeatures
Today'
shome-theaterremotesdoalotmorethanturnacomponentonandoffandcontrolthevolume.Herearejustahandfulofthefeaturesyoucanfindonsomeofthehigher-techremotecontrolsoutthere.
Universalcapabilities
Differentelectronicsbrandsusedifferentcommandcodes.SomeIRremotesarepreprogrammedwithmorethanonemanufacturer'
scommandcodessotheycanoperatemultipledevices(sometimesupto15)ofdifferentbrands.Ifyourhome-theatersetupincorporatescomponentsfrom,say,threedifferentmanufacturers,youcaneitherusethreedifferentremotestooperateyoursystemoruseoneuniversalremote.Toaddfunctionstoauniversalremote,youneedtoknowthecommandcodesforthecomponentyouwanttocontrol.Youcanlooktheseuponlineorfindtheminthemanualthatcamewithyourremote.
Learning
Alearningremotecanreceiveandstorecodestransmittedbyanotherremotecontrol;
itcanthentransmitthosecodestocontrolthedevicethatunderstandsthem.Forinstance,let'
ssayyouhaveareceiverwithitsownpreprogrammedremote,andyoubuyanewTVthatcomeswithauniversallearningremote.Thelearningremotecanpickupthesignalsyourreceiverremotesendsoutandrememberthemsoitcancontrolyourreceiver,too.Youdon'
tneedtoinputthecommandcodesyourself--alearni
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