Baud rate is a measure of the number of times per second a signal in a communications channel changes state. The state is usually voltage level, frequency, or phase angle.
Baud Rate
See also
Baud, Bit RateThis entry contributed by Shaun Rogers
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Rogers, Shaun. "Baud Rate." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/BaudRate.html