This set of Digital Signal Processing Multiple Choice Questions & Answers (MCQs) focuses on “Oversampling A/D Converters”.

1. For a given number of bits, the power of quantization noise is proportional to the variance of the signal to be quantized.

a) True

b) False

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Explanation: The dynamic range of the signal, which is proportional to its standard deviation σ

_{x}, should match the range R of the quantizer, it follows that ∆ is proportional to σ

_{x}. Hence for a given number o f bits, the power o f the quantization noise is proportional to the variance of the signal to be quantized.

2. What is the variance of the difference between two successive signal samples, d(n) = x(n) – x(n-1) ?

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3.What is the variance of the difference between two successive signal samples, d(n) = x(n) –ax(n-1) ?

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Explanation: An even better approach is to quantize the difference, d(n) = x(n) –ax(n-1), w here a is a parameter selected to minimize the variance in d(n). Therefore

4. If the difference d(n) = x(n) –ax(n-1), then what is the optimum choice for a = ?

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Explanation: An even better approach is to quantize the difference, d(n) = x(n) –ax(n-1), w here a is a parameter selected to minimize the variance in d(n). This leads to the result that the optimum choice of a is

5. What is the quantity ax(n-1) is called?

a) Second-order predictor of x(n)

b) Zero-order predictor of x(n)

c) First-order predictor of x(n)

d) Third-order predictor of x(n)

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Explanation: In the equation d(n) = x(n) –ax(n-1), the quantity ax(n-1) is called a First-order predictor of x(n).

a) DCPM

b) DMPC

c) DPCM

d) None

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Explanation: A differential predictive signal quantizer system. This system is used in speech encoding and transmission over telephone channels and is known as differential pulse code modulation (DPCM ).

7. What is the expansion of DPCM?

a) Differential Pulse Code Modulation

b) Differential Plus Code Modulation

c) Different Pulse Code Modulation

d) None

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Explanation: A differential predictive signal quantizer system. This system is used in speech encoding and transmission over telephone channels and is known as differential pulse code modulation (DPCM ).

8. What are the main uses of DPCM?

a) Speech Decoding and Transmission over mobiles

b) Speech Encoding and Transmission over mobiles

c) Speech Decoding and Transmission over telephone channels.

d) Speech Encoding and Transmission over telephone channels

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Explanation: A differential predictive signal quantizer system. This system is used in speech encoding and transmission over telephone channels and is known as differential pulse code modulation (DPCM ).

9. To reduce the dynamic range of the difference signal d(n) = x(n) – x ̂(n), thus a predictor of order p has the form?

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Explanation: T he goal of the predictor is to provide an estimate x ̂(n) of x(n) from a linear combination of past values of x(n), so as to reduce the dynamic range of the difference signal d(n) = x(n) – x ̂(n). Thus a predictor of order p has the form

10. The simplest form of differential predictive quantization is called?

a) AM

b) BM

c) DM

d) None

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Explanation: The simplest form of differential predictive quantization is called delta modulation (DM ).

11. What is the abbreviation of DM?

a) Diameter Modulation

b) Distance Modulation

c) Delta Modulation

d) None

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Explanation: The simplest form of differential predictive quantization is called delta modulation (DM ).

a) 2-bit, one-level

b) 1-bit, two-level

c) 2-bit, two level

d) 1-bit, one level

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Explanation: T he simplest form o f differential predictive quantization is called delta modulation (DM ). In DM, the quantizer is a simple 1-bit (two -level) quantizer.

13. In DM, What is the order of predictor is used?

a) Zero-order predictor

b) Second-order predictor

c) First-order predictor

d) Third-order predictor

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Explanation: In DM, the quantizer is a simple 1-bit (two -level) quantizer and the predictor is a first-order predictor.

14. In the equation x_{q}(n)=ax_{q}(n-1)+ d_{q}(n), if a = 1 then integrator is called?

a) Leaky integrator

b) Ideal integrator

c) Ideal accumulator

d) Both b & c

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Explanation: In the equation x

_{q}(n)=ax

_{q}(n-1)+ d

_{q}(n), if a = 1, we have an ideal accumulator (integrator).

15. In the equation x_{q}(n)=ax_{q}(n-1)+ d_{q}(n), if a < 1 then integrator is called?

a) Leaky integrator

b) Ideal integrator

c) Ideal accumulator

d) Both b & c

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Explanation: In the equation x

_{q}(n)=ax

_{q}(n-1)+ d

_{q}(n), a < 1 results in a ”leaky integrator”.

**Sanfoundry Global Education & Learning Series – Digital Signal Processing.**

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