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 in per unit time. While Baud rate is the number of signal units transmitted per unit time that is needed to represent those bits.
The crucial difference between bit rate and baud rate that one change of state can transmit one bit, or slightly more or less than one bit that depends on the modulation technique used. Hence, the given equation defines the relation between the two:
Bit rate = baud rate x the number of bit per baud
If we talk about computer efficiency, the bit rate is the more important where we want to know how long it takes to process each piece of information. But when we are more concerned about how that data is moved from one place to another we emphasize on the baud rate. The fewer signals required, the more efficient the system and the less bandwidth needed to transmit more bits.
An analogy can clarify the concept of bauds and bits. In transportation, a baud is analogous to a bus, a bit analogous to a passenger. A bus can carry multiple passengers. If 1000 buses go from one point to another carrying only one passenger (the driver), then 1000 passengers are transported. However, if each bus carries twenty passengers (suppose), then 20000 passengers are transported. Note that some buses, not the number of passengers, determines the traffic and, therefore, the need for wider highways. Similarly, the number of bauds determines the required bandwidth, not the number of bits.
Content: Bit Rate Vs Baud Rate
|Basis for comparison||Bit rate||Baud rate|
|Basic||Bit rate is the number of bits per second.||Baud rate is the number of signal units per second.|
|Meaning||It determines the number of bits traveled per second.||It determines how many times the state of a signal is changing.|
|Term usually used||While the emphasis is on computer efficiency.||While data transmission over the channel is more concerned.|
|Bandwidth determination||Can not determine the bandwidth.||It can determine how much bandwidth is required to send the signal.|
|Equation||Bit rate = baud rate x the number of bits per signal unit||Baud rate = bit rate / the number of bits per signal unit|
Definition of Bit Rate
Bit rate can be defined as the number of bit intervals per second. And bit interval is referred to as the time required to send one single bit. In simpler words, the bit rate is the number of bits sent in one second, usually expressed in bits per second (bps). For example, kilobits per second (Kbps), Megabits per second (Mbps), Gigabits per second (Gbps), etc.
Definition of Baud Rate
Baud rate is expressed in the number of times a signal can change on transmission line per second. Usually, the transmission line uses only two signal states, and make the baud rate equal to the number of bits per second that can be transferred.
An example can illustrate it. For example, 1500 baud rate means that the channel state can change up to 1500 times per second. The meaning of changing state means that channel can change its state from 0 to 1 or from 1 to 0 up to 1500 times per second (in the given case).
Key Differences Between Bit Rate and Baud Rate
- Bit rate is the number bits (0’s and 1’s) transmitted per second.
On the other hand Baud rate is the number of times a signal is traveling comprised of bits.
- Baud rate can determine the bandwidth of the channel or its required amount to send the signal while through Bit rate it is not possible.
- Bit Rate can be expressed by the given equation:
Bit rate = baud rate x the number of bits per signal unit
In contrary Baud rate is expressed in the given equation:
Baud rate = bit rate / the number of bits per signal unit
Bit rate and Baud rate, both the terms are used in the same way to examine the speed of data. But, the Bit rate is used when we want to know the number of bits transmitted per unit of time whereas Baud rate is used when we want to know the number of signal units transmitted per unit of time.