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baud    音標拼音: [b'ɔd]
波特

波特

Baud



baud
波特 BD

baud


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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英文字典中文字典相關資料:
  • What is the difference between baud rate and bit rate?
    Bit Rate [Baud Rate * Signal Unit]: 4000 bps (bits per second) Bit rate and Baud rate, these two terms are often used in data communication Bit rate is simply the number of bits (i e , 0’s and 1’s) transmitted per unit time While Baud rate is the number of signal units transmitted per unit time that is needed to represent those bits
  • Baud rate vs. Bit rate - Electrical Engineering Stack Exchange
    A minor point: by definition, a Baud (named after Emile Baudot) is one symbol per second So your statement, baud 115200 means 115200 bits per second only if each baud = 1 bit If each baud is 5 bits, then having baud 115200 means a bit rate of 115200 * 5 bits per seconds is correct in spirit, but you should replace the word "baud" with "symbol"
  • What standard UART rates are there?
    However these are actually bits per second (bps), not baud -- see below 110 baud was used by 8-level Teletypes like the ASR-33 I'm not aware where 150 Baud was used, but it is a doubling of 75 baud, commonly used (along with 60 baud) for 5-level TTYs 300 bps was the standard for the first widely-used telephone modems in the 1960's
  • signal processing - Difference between bit rate and baud rate . . .
    Baud rate is the number of symbols per second Bit rate is the number of the information bits per second To see the difference, consider a transmission line capable of having 4 different states, say 0 , 1 , 2 and 3V
  • microcontroller - How do you determine which baud rate to choose, its . . .
    Baud rates near the MCU frequency are rarely usable, so putting a divisor up front allows for a wider selection of baud rates using the same 8-bit or 16-bit divisor c) The UART hardware itself needs some clock cycles to process each bit (this includes having three separate clock cycles when using the 3X sampling mode)
  • baudrate - How are two definitions of baud rate same? - Electrical . . .
    The bit rate VS baud rate has been a confusing topic for me lately I feel like I am clear about the difference between these two But going through the definitions of baud rate, I find two different definitions in use: A baud rate is the number of times a signal in a communications channel changes state or varies
  • Difference between bit rate and baud rate and its origins?
    Baud rate refers to the number of "slots" per second With most forms of serial communication the data in each slot is a one or a zero But one could, eg, transmit a voltage indicating a value between zero and three, for four (vs two) possible values per slot
  • How to demonstrate the effect of baudrate in serial communication
    With 9600 baud the transmission speed will be at maximum 9600 10 = 960 bytes per second, with 115200 baud it will be 11520 bytes per second The lowest standard baudrate I know of is 75 baud, giving seven-and-a-half bytes per second Now try this little sketch Note: since I don't have an Arduino at hand it is not tested and may contain errors
  • SPI : How to calculate the baud rate through clock and bit rates?
    Baud rate is the rate of change of polarity on your baseband, in telex days it was equal to the bit rate With FM modems it was much larger, with PSK FSK it was usually double and with modern modulation techniques it may be a fraction like 1 16 in 16PQAM modulation
  • baudrate - Computer and FTDI cable baud rates - Electrical Engineering . . .
    I've heard is that computers can max have a baud rate of 230400 baud No Certain very popular chips from the 1980s had a maximum baud rate of 115200 when clocked by a 1 8432MHz clock (which was standard, at the time, for historical reasons that extend back to the 1960s)





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