Technical lingo is a kind of shorthand that's used lớn express concepts common to lớn that specific topic or area of study. Technical lingo is important because it provides a very precise or chất lượng "shorthand" mô tả tìm kiếm of a device, effect or concept. Unfortunately, if you aren't comfortable và familiar with the lingo of a topic it can be a tall hurdle lớn communicate efficiently with folks who consider the jargon of their field to be "self-explanatory." In this series of articles we'll lift the veils of misunderstanding from the lingo of the A/V industry.
WHAT IS BAUD?
Years ago (for those of us who've been in the industry since compact disc was an emerging idea) we used to speak of modem tốc độ in "baud rate." It's rare to lớn hear that unit used outside of serious engineering circles today, but it is still an important concept. While we may have lost the word "baud" from the casual lexicon (when was the last time you discussed a 14.4 baud modem?) once we moved beyond 20th Century icons like Prodigy, AOL & Compuserve, we certainly haven't lost the need to lớn understand data transfer rates over an analog connection. The concept of baud will make an important comeback when we discuss HDBaseT & other new digital đoạn phim transfer systems.
Baud is similar khổng lồ the gross bit rate of data transfer we typically express in bits-per-second (bps). For example, you might say one that the IT network in your building is delivering one gigabits per second (Gbps). You wouldn't say that the network is operating at one gigabaud, however. To lớn understand the difference we need to take a look at history.
The baud was named for Jean-Maurice-Emile Baudot, a 19th Century engineer and inventor. Baudot worked during a time when Morse Code was state of the art. He managed lớn invent a system that allowed multiple transmissions to lớn take place simultaneously over a single line. This early teletype system made it possible for multiple text messages khổng lồ be sent over a single telephone line. This revolution in transmission made possible the connection of distant cities over a single cable, và thus began a journey that ultimately produced the Internet.
The baud is the unit of symbol rate or modulation rate, which is the number of distinct changes made khổng lồ the transmission medium per second in a digitally modulated signal or a line code. In "pure" digital systems (i.e., using discrete/discontinuous values) with binary code, 1 Bd = 1 bit/s. But since it really isn't possible to send "1's & 0's", in practice we typically represent this digital value by using analog levels. The signal inside the wire is analog & it represents digital data. Analog connections use a continuous range of values to lớn represent information, & in these systems the exact informational form size of one Bd varies. Typically the data rate (bits per second) is significantly larger than the symbol rate (baud rate) because a single symbol can represent more than one bit.
Because baud is the rate of changes made to a carrier wave each second, it has a direct relationship lớn frequency bandwidth as measured in hertz. This is why category cables have their bandwidth specified in megahertz (MHz, or millions of cycles per second) và not Mbit/s and it begins to point us to lớn the explanation of why a Cat5e cable, specified at 100MHz bandwidth, can make a Gigabit connection.
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