Question

Dibits are:
A. Two Phase signals
B. Four phase signals
C. Four frequency signals
D. Two frequency signals

Answer 1

Hint: Dibit is composed of two bits. It is one of any of the four patterns formed by two consecutive bits. Dibits can be phase modulated onto a carrier signal as a different shift in the wave phase.

Complete step by step answer:
Dibits are referred to as a modulation technique that combines two bits on a baud, which doubles the baud rate and that becomes the bit rate of the signal. This technique employs four signal states formed out of two consecutive bits. Quadrature phase-shift keying also known as QPSK is a dibit technique that is done by forming four phase shifts separated by 90 degrees.
Baud rate is a number that is given as bits per second is a measurement of the speed of data transmission in a system. Baud rates give information about the electrical oscillations of the signal on a per-second basis, which occurs during data transmission. Now, it is said that the higher the baud rate, the higher the speed of data transmission since the number of bits transferred per second is higher.
Dibits are similar to that of baud rate, but dibit transfers two bits per second. Hence, the speed of data transmission will be higher. Generally in the phase shift keying process, a bit is converted into two-phase signals. Since dibit consists of a pair of consecutive bits, the number of phase signals is four.
Hence, option (B) is the right answer for the given question.

Note: Phase shift keying is one of the digital modulation processes that convey information by modulating the phase of a constant frequency of carrier wave. This is done by varying the sin and cosine inputs of the wave with respect to time and is used in LAN, bluetooth, etc.