Digital and Analog Data Transmission

What are digital signals?

What are analog signals?

Modem is a_____ device that enables a computer to transfer data from telephone lines to computers and computers to telephone lines. 

Conversion to analog signal is known as modulation; conversion back to binary signal is known as demodulation.

What is modem full form?
 

What is the function of modem?

Name the equipment which can transmit optics signal through it and used as 'light pipe'.

What are the advantages of analogue signal?

The human voice is an analogue signal while computers use digital signals.

Sine wave is a fundamental 

Write a short note on digital signal.

The logic circuit shown in figure, has the input waveforms $A$ and $B$ as shown. The correct output waveform is:

Fork system call with fail if:

The state of signals is:

The magnitude and phase of the complex Fourier series coefficients ${\mathrm{a}}_{\mathrm{K}}$ of a periodic signal $\mathrm{x}\left(\mathrm{t}\right)$ are shown in the figure. Choose the correct statement form the four choices given. Notation: $C$ is the set of complex numbers, $R$ is the set of purely real numbers, and $P$ is the set purely imaginary numbers.

The Binary Code equivalent of decimal 429 is

The time variations of signals are given as in $A, B$ and $C$. Point out the true statement from the following.

The time variations of signals are given in $A, B$ and $C$. Point out the true statement from the following.

Digital signals

(i) do not provide a continuous set of values
(ii) represent values as discrete steps
(iii) can utilize binary system and
(iv) can utilize decimal as well as binary systems

Which of the above statements are true ?