# DSP Interview Questions And Answers

Jan 16 • Resources • 81323 Views • 22 Comments on DSP Interview Questions And Answers

DSP

Digital signal processing interview questions

Q1.- Classify signals.

Ans1.

Continuous-time, continuous amplitude (Analog Signals)

Discrete time, continuous amplitude

Continuous time, discrete amplitude

Discrete-time, discrete-amplitude

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Q2.-What is the use of Random Signals?

Ans2. Random signals are used to test dynamic response statistically for very small amplitudes and time-duration.

Q3.- Classify Systems.

Ans3. Linear, stable and time-invariant.

Q4.-What do you mean by aliasing in digital signal processing? How it can be avoided?

Ans4. Aliasing refers to an effect due to which different signals become indistinguishable. It also refers to distortion in the reconstructed signal when it is reconstructed from the original continuous signal.

To avoid aliasing we can simply filter out the high frequency components of the signal by using anti-aliasing filter like optical anti-aliasing filter.

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Q5. – What are the differences between a microprocessor and a DSP processor?

Ans5. DSP processors are featured to support high performance and repeatitive and intensive tasks whereas microprocessors are not application specific and they are designed to process control-oriented tasks.

Q6. – What is the convolution?

Ans6. Convolution is the technique of adding two signals in time domain. We can also do this quite easily by changing the domain of signals from time domain to frequency domain using Fast Fourier Transform (FFT).

Q7.- What is FFT?

Ans7. FFT is a fast way to calculate Discrete Fourier Transform (DFT). It is much more efficient then DFT and require less number of coding lines. Due to FFT several kind of techniques are feasible.

Q8.- What is the advantage of a Direct form II FIR over fom I?

Ans8. Direct Form II FIR filters requires half the number of delay units as much as used by Form I.

Q9.- What is interpolation and decimation?

Ans9. Interpolation is the process of increasing the sample rate in dsp whereas decimation is the opposite of this that is, it is the process of decreasing the sample rate in dsp.

10.- Difference between DFT and DTFT.

Ans10.

 DFT DTFT 1-Limited number of samples of periodic signal 1-unlimited number of samples. 2- input is always periodic 2-input may not always be periodic 3- physically realizable 3- mathematically precise 4- frequency becomes discrete 4- frequency is continuous

### 22 Responses to DSP Interview Questions And Answers

1. Archie says:

Nothing

2. Archie says:
3. gunturu swapna says:
4. V.SHUNMUGA PRIYA says:

5. DNYANESHWAR says:

I want interview questions which might be asked for DSP Subject for fresher as well as Experienced candidate

6. DNYANESHWAR says:
7. k.hemabanu says:

viva question for dsp

8. k.hemabanu says:

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10. Bunga Murali Bunga Shyamala says:

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11. Bunga Murali Bunga Shyamala says:

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12. Bunga Murali Bunga Shyamala says:
13. shrinivas kulkarni says:

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15. Shaik Rizzu Hussain says:

i need to prepare for interview on signals and system and dsp for desighnation optical analyst

16. naresh says:

interview questions on signal processing and digital telemetry

17. PURUSHOTTAM KUMAR says:

WHY differentiater is not used in realiasing the filter

18. Imran Ansari says:

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19. RANJIT SINGH says:

Digital signal processing is a very important subject in b.tech (ECE).So if a student go through these paper once he/she might not have problem in answering question in interview.

20. SANJANA KUMARI says:

DSP stands for Digital Signal Processing. DSP is a very important subject for Engineering and Diploma students. It is basically a numerical paper but it also consists of some very important theory portions that are required to be studied well as beginners. I think this article consists of almost all the basic questions that are and can be asked in ones Exam Viva during practicals. I would suggest interested students to go through the questions and prepare well.

21. patlakshi says:

For the ones who have interest in dsp can go through these answer and questions which can be helpful in gaining the knowledge.

22. patlakshi says:

The above article comprises of dsp interview questions . The ones who are interested can go through this.