Atthereceivingterminal_______toseparatethe8-digitsequencesintotheappropriatechannels.
thecodecisrequired
thaframecodeisneeded
PCMisused
ademultiplexerisarranged
Withintheterrestrialsystem,themessagesignalisstrongand________.
thenoisepowerisverylow
theniosepowerisalsostrong
thenoiseisveryweak
thenoiseisinouterspace
PCMisdependentonthreeseparateoperations,___________.
coding,decodingandchoosing
sampling,quantizingandperforming
sampling,codinganddecoding
sampling,quantizingandcoding
Forexample,thesignal________fromasattelite,locatedinfarouterspace,isveryweak.
receiving
received
bereceived
inPCMsystem
词组“被传信号的波形”的英文是：
theshapetotransmitsignal
shapesiganltotransmit
transmitsignalshape
theshapeoftransmittedsignal
“格式”的英文是：
form
format
formula
frame
“编译码器”的英文是：
codec
coder
decoder
unique
“参数”的英文是：
system
parameter
environment
attenuation
“同步”的英文是：
parameter
reexamination
environment
synchronization
“信噪比”的英文是：
knownastheratio
noiseandsignal
signalovernoise
signal-to-noiseratio