Chapter 2: PCM & Digital Modulation

The pulse code modulation comes under ___________________ modulation?

• Analog

• Digital

• Both (a) and (b)

• None of the above

The figure shown below is a block diagram of _________________ modulation receiver?

• Adaptive differential pulse code

• Pulse Code

• Differential pulse code

• None of the above

_______________ are the essential operations in pulse code modulation transmitter system?

• Sampling

• Encoding

• Quantizing

• All of the above

The pulse modulation classified into _______________________ types?

• Four

• Two

• Sixteen

• All of the above

Answer explanation

Pulse modulation classified into two types they are pulse analog and pulse digital modulations

Which of the following are the types of analog modulation?

• AM

• PM

• FM

• All the above

Which of the following are the digital modulation techniques?

• ASK

• PSK

• FSK

• All the above

Abbreviate ASK?

• Amplitude Shift Keying

• Amplitude Side Keying

• Angle Shift Keying

• Angle Side Keying

ASK modulation is also called ____?

• OOK

• On/Off

• Off

• Both a and b

How many input signals are required in ASK?

• 1

• 2

• 3

• 4

Answer explanation

2 input signals are required in ASK binary input and carrier signal

M- ary digital technique transmits ____ number of bits per time?

• 1

• 2

• 0

• >2

Answer explanation

M- ary digital technique transmits more than 2 number of bits per time.