Baud refers to the rate of signal changes or signal transitions per second in a communication system. It is a unit of measurement that is commonly used to express the speed or data transfer rate in serial communication. The term “baud” is often used interchangeably with “bits per second” (bps), but it’s important to note that they are not always equivalent, especially in modern communication systems.
In traditional asynchronous serial communication, each baud represents one symbol per second, and each symbol can carry multiple bits of information. For example, in the context of RS-232 communication, a baud rate of 9600 indicates 9600 symbols (or transitions) per second.
However, in more complex modulation schemes, multiple bits can be encoded in a single symbol, affecting the relationship between baud and bits per second. For instance, in some communication systems using advanced modulation techniques like quadrature amplitude modulation (QAM) or phase-shift keying (PSK), multiple bits can be transmitted per symbol.
In modern terminology and practice, especially in digital communication, the terms “baud” and “bps” are often used interchangeably because one symbol typically represents one bit in these systems. Therefore, in many cases, a baud rate of 9600 is equivalent to a data transfer rate of 9600 bits per second.
In summary:
In traditional serial communication, baud represents symbols per second, and the baud rate is directly equivalent to the data transfer rate in bits per second.
In more advanced modulation schemes, the relationship between baud and bits per second can be influenced by the number of bits encoded in each symbol.
When specifying the communication speed, it’s common to use bps to refer to the actual data transfer rate, and baud is used in contexts where it aligns with the traditional definition of symbols per second.
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