This set of Video Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Digital System Hardware, Signal Quantization and Encoding”.
1. Which of the following circuits are collections of devices that perform logical operations on two logical gates?
a) Digital
b) Analog
c) Open
d) Close
View Answer
Explanation: Logical operations on 2 logical States represented by voltage levels are performed by a collection of devices known as digital circuits. Devices known as gates perform standard operations such as AND, OR, INVERT, EQUIVALENCE, etc. Yes/no decisions based on the states of the inputs can be made by combining groups of compatible gates.
2. Which of the following can be put into one of two stable states with a pulse applied to a specified input?
a) DTV
b) CATV
c) Flip-flops
d) CCTV
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Explanation: Flip flops are circuit that can be put into one of two stable states with a pulse applied to a specified input. The circuit then remains in that state until another pulse is received. This constitutes a form of memory, in that the circuit “remembers” that a pulse was applied sometime in the past. An obvious application is in Computer memory chips, where millions of flip-flops are put on a single Integrated circuit.
3. Registers are used to store information which is an array of flip-flops.
a) True
b) False
View Answer
Explanation: The free running multi-vibrators are mostly used to generate clock pulses. Registers are used to store information which is an array of flip-flops. These registers are triggered by common clock. An obvious application is in computer memory chips, where millions of flip-flops are put on a single integrated circuit.
4. What is the full form of ADC?
a) Active-to-digital conversion
b) Analog-to-discrete conversion
c) Analog-to-digital conversion
d) Active-to-digitization conversion
View Answer
Explanation: In order to transmit signals, such as speech and video signals, we have to digitize them first. The process of converting analog to digital is called analog-to-digital conversion (ADC). ADC involves three procedures, sampling, quantizing and binary encoding.
5. In which step of the signal quantization we do what is left for a signal to be called as amplitude discretization?
a) Sampling
b) Quantizing
c) Binary encoding
d) Digital hardware
View Answer
Explanation: Once we sample a signal, it is called a discrete signal. The next step for digitization is quantization. In this step, we do what is left for a signal to be called as digital, that is, amplitude discretization. We divide the amplitude into discrete levels.
6. What is the formula of sampling frequency?
a) fs ≥ 2W
b) fs ≤ 3W
c) fs ≥ 5W
d) fs ≤ 2W
View Answer
Explanation: It has been proved that the sampling of analog video signal at 256 levels is sufficient. As per Nyquist rate, sampling frequency is fs ≥ 2W.
Where,
W = Bandwidth
fs = Sampling frequency
7. How many levels are there of sampling for audio signal quantization?
a) 32 to 164
b) 64 to 255
c) 32 to 64
d) 64 to 128
View Answer
Explanation: The process of converting a continuous analog audio signal to a digital signal with individual numerical values is called quantization. There can be 64 to 128 levels of sampling for audio signal quantization depending on desired sound quality. For 128 levels high quality sound a seven bit code is needed since 27 = 128.
Sanfoundry Global Education & Learning Series – Video Engineering.
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