baud 音标拼音: [b'ɔd]
波特
波特
Baud 鲍
baud 波特
BD baud 鲍
baud n 1 : (
computer science )
a data transmission rate (
bits /
second )
for modems [
synonym : {
baud }, {
baud rate }]
baud \
baud \ (
b [
add ]
d or b [^
o ]
d ),
n . [
Named after J .
M .
E .
Baudot ,
a French inventor ,
died 1903 .] (
Computers ,
telecommunications )
A unit of transmission speed for information conveyed over a digital communications channel ,
usually taken as equal to the number of bits of information transmitted per second .
The speed in bauds indicates the number of signalling events per second ;
however ,
since it is necessary in most cases to transmit control information along with the data ,
the {
data signalling rate }
may be smaller than the baud rate .
[
PJC ]
/bawd / (plural "baud ") The unit in
which the information carrying capacity or "{signalling rate }"
of a communication channel is measured . One baud is one
symbol (state -transition or level -transition ) per second .
This coincides with bits per second only for two -level
modulation } with no {framing } or {stop bits }.
A symbol is a unique state of the communication channel ,
distinguishable by the receiver from all other possible
states . For example , it may be one of two voltage levels on a
wire for a direct digital connection or it might be the phase
or frequency of a carrier .
The term "baud " was originally a unit of telegraph signalling
speed , set at one {Morse code } dot per second . Or , more
generally , the reciprocal of the duration of the shortest
signalling element . It was proposed at the International
Telegraph Conference of 1927 , and named after {J .M .E . Baudot }
1845 -1903 ), the French engineer who constructed the first
successful teleprinter .
The UK {PSTN } will support a maximum rate of 600 baud but each
baud may carry between 1 and 16 bits depending on the coding
e .g . {QAM }).
Where data is transmitted as {packets }, e .g . characters , the
actual "data rate " of a channel is
R D / P
where R is the "raw " rate in bits per second , D is the number
of data bits in a packet and P is the total number of bits in
a packet (including packet overhead ).
The term "baud " causes much confusion and is usually best
avoided . Use "bits per second " (bps ), "bytes per second " or
characters per second " (cps ) if that 's what you mean .
1998 -02 -14 )
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