In digital data transmission
A. Baud rate in equal to bit rate
B. Baud rate is always smaller than the bit rate
C. Baud rate is always higher than the bit rate
D. All of the above
E. None of the above
Answer: Option A
Solution (By Examveda Team)
In digital data transmission, two important terms are used to describe the transmission speed — bit rate and baud rate.Bit Rate: It is the number of bits transmitted per second. For example, if 1000 bits are sent every second, the bit rate is 1000 bps (bits per second).
Baud Rate: It is the number of signal units (also called symbols) transmitted per second. A symbol may represent one or more bits depending on the modulation technique used.
When each symbol represents exactly one bit (as is common in basic transmission systems), then:
Baud Rate = Bit Rate
If more complex encoding techniques are used, where each symbol can represent multiple bits (e.g., 2, 4, or more), then:
Bit Rate = Baud Rate × Number of bits per symbol
But the question refers generally to digital data transmission without such specific encoding. So, in most simple digital transmission cases, baud rate equals bit rate.
Hence, the correct answer is Option A.
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Option B: Baud rate is always smaller than the bit rate.
In advanced modulation techniques, one symbol can represent multiple bits, making the bit rate higher than the baud rate. For example, a modem might use a symbol that represents 4 bits, so the bit rate would be four times the baud rate.
No, baud rate and bit rate are not always equal in digital transmission. While they can be the same in some simple cases, they represent different aspects of data transmission. Baud rate refers to the number of signal changes or symbols transmitted per second, whereas bit rate refers to the number of bits transmitted per second.
Here's a more detailed explanation:
Baud Rate:
A baud rate of 1000 baud means there are 1000 signal events (or symbols) transmitted per second. These symbols could represent a single bit (0 or 1) or multiple bits, depending on the modulation technique used.
Bit Rate:
A bit rate of 1000 bps (bits per second) means that 1000 binary digits (0s and 1s) are being transmitted every second.
Relationship:
The bit rate is often equal to the baud rate when each symbol represents only one bit (like in simple serial communication with UART). However, in more advanced modulation techniques, one symbol can represent multiple bits, making the bit rate higher than the baud rate. For example, a modem might use a symbol that represents 4 bits, so the bit rate would be four times the baud rate.
In essence: Baud rate is about the signaling speed, while bit rate is about the information transfer speed.
Example:
Simple case:
A UART (Universal Asynchronous Receiver/Transmitter) operating at 9600 baud with a 8N1 (8 data bits, no parity, 1 stop bit) configuration will have a bit rate of 9600 bps because each symbol represents one bit.
Complex case:
A modem using 64QAM (Quadrature Amplitude Modulation) will have a bit rate that is six times its baud rate, because each symbol represents 6 bits.