# Quantization Techniques

This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Quantization Techniques”.

1. Quantization is a process of mapping a ________ range of amplitude of a signal into a finite set of __________ amplitudes.
a) Continuous, discrete
b) Discrete, continuous
c) Discrete, discrete
d) Continuous, continuous

2. For a n bit quantizer, number of levels is equal to __________
a) n
b) 2n
c) n2
d) 2n

3. Distortion produced by quantization is directly proportion to ________ and inversely proportional to ______
a) Number of levels, step size
b) Amplitude of the signal, step size
c) Square of step size, number of levels
d) Amplitude of the signal, number of levels

4. Signal to quantization noise ratio of a PCM encoder is given by _________
a) 6.02n + α
b) 3n + 6.02α
c) n + 6.02α
d) 6.02n + α

5. Companding technique used in the US is called ____________
a) μ law
b) A law
c) Hybrid companding
d) Direct companding

6. An adaptive quantizer varies its ___________ in accordance to input speech signal power.
a) Level
b) Step size
c) Amplitude
d) Frequency

7. Shannon predicted that better performance can be achieved by coding one sample at a time.
a) True
b) False

8. ________ is a delayed decision coding technique.
b) Uniform quantization
c) Vector quantization
d) Non-uniform quantization

9. The characteristics of compressor in μ-law companding are _________
a) Continuous in nature
b) Logarithmic in nature
c) Linear in nature
d) Discrete in nature

10. What is the sequence of operations in PCM?
a) Sampling, quantizing, encoding
b) Quantizing, encoding, sampling
c) Quantizing, sampling, encoding
d) None of the mentioned

11. In Adaptive Delta Modulation, the slope error reduces and ___________
a) Quantization error decreases
b) Quantization error increases
c) Quantization error remains same
d) None of the mentioned