1. Introduction
This article mainly introduces the concepts of bit rate and baud rate, as well as the differences and connections for reference.
2. Definition
Bit rate: In a digital channel, the bit rate is the transmission rate of a digital signal. It is expressed by the number of effective bits (bits) of the binary code transmitted per unit time. Its unit is bits per second (bps), Expressed in kilobits per second (Kbps) or megabits per second (Mbps) (where K and M are 1000 and 1000000 respectively, rather than 1024 and 1048576 when referring to computer memory capacity).
Baud rate: Baud rate refers to the modulation rate of the carrier wave by the data signal. It is expressed by the number of changes in the carrier modulation state per unit time, and its unit is baud. The relationship between baud rate and bit rate is: bit rate = baud rate
3. Differences and connections
In the field of electronic communications, the baud rate is related to the modulation rate. If the signal change per unit time represents one symbol, the baud rate is consistent with the modulation rate. If 2 units of time change 3 or 4 times to represent 2 symbols, the baud rate is half the modulation rate, such as Manchester coding. It refers to the baud number per unit time after the signal is modulated, that is, the number of times the carrier parameters change per unit time. It is a measure of signal transmission rate, usually in baud.
Baud rate is sometimes confused with bit rate, which is actually a measure of the rate at which information is transmitted (transmission rate). The baud rate can be understood as the number of transmitted symbol symbols per unit time (transmission symbol rate). Multiple bits of information can be loaded on one symbol through different modulation methods.
Obviously, the bit rate of two-phase modulation (a single modulation state corresponds to 1 binary bit) is equal to the baud rate; the bit rate of four-phase modulation (a single modulation state corresponds to 2 binary bits) is twice the baud rate; eight-phase modulation (A single modulation state corresponds to 3 binary bits) The bit rate is three times the baud rate; and so on.
4. Summary
Bit rate is used to describe the transmission rate of digital signals, in bps (bit per second).
The baud rate is a unit used to describe the transmission rate of symbols, indicating how many symbols are transmitted per unit time. The transmission rate of the symbol is also called the modulation rate, which is defined from the perspective of digital signals (only two states: 0 and 1).