Test your basic knowledge |

DSP: Digital Signal Processing

Subject : it-skills
Instructions:
  • Answer 46 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Two properties lead to simplifications of mathematical analysis: - __________ - time-invariance






2. The negative half cycle of the function waveform is the same shape as the positive half - except inverted - Both sine and cosine functions have this - Functions with this have only odd harmonics.






3. Imax-Imin / 2^n - 1






4. DSP Applications: - radar and sonar - oil exploration - space exploration - _______






5. Echo Location uses: radar - sonar - _______






6. Uses a relatively low frequency message signal to modulate or vary the frequency of a relatively high frequency carrier signal






7. Waveform is symmetrical about the vertical axis or f(x) = f(-x); - Cosine is this function - only have cosine terms and may have a constant.






8. Graphical representation of the frequency content of a signal - allows us to quickly and easily see the relationship between different frequency components and their amplitudes






9. Waveform is symmetrical about the origin or f(x) = -f(-x); - Sine is this function - only sine terms and no constant term.






10. Type of decomposition relies on the use of a function known as the delta function or unit _____function






11. Radar - Sonar - Data Communication






12. A phasor rotating in negative (clockwise) direction






13. Refers to what we are familiar with as the signal itself - with amplitude values plotted against time values






14. Used in medical fields - space - commercial imaging products






15. Occur frequently in nature - sound waves - electromagnetic radiation - any type of periodic waveform can be constructed from this signal






16. States any periodic waveform can be approximated by a sum of harmonically related sinusoids






17. A formal mathematical operation - takes two signals and produces a third signal






18. Processing of signals by digital means






19. Represented mathematically by an indexed sequence of numbers






20. Obtained by recording the values of x(t) at equally spaced time instants - the result is a sequence of numbers whose individual values are samples of the analog signal






21. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form)






22. Use only the current and past input samples to calculate the current output sample; -no feedback -non recursive filters






23. Equivalent to the principle of superposition - if the input is the sum of two or more scaled sequences - we can find the output of each sequence acting alone - then add (superimpose) the separate scaled output






24. A phenomenon of sinusoids changing frequency during sampling; sinusoid assumes a frequency other than its own






25. Filter output sample depends on previous input samples and previous filter output samples - these filters always have a feedback component - recursive filters






26. Uses a signal that has been quantized into discrete values rather than a continuous signal






27. Varying quantity that is a function of time; time is continuous - then the value of the signal can be found at any point in time; - not discrete






28. If an input is delayed (shifted) by n0 - then the output is delayed by the same amount






29. Description of how one parameter is related to another - ex. voltage which varies with time is common in analog electronics






30. Uses a process called the Discrete Fourier Transform or DFT - used to determine the frequency content of a continuous signal






31. The conversion of analog or continuous signals to digital or discrete signals - referred to as analog-to-digital conversion - value of signal is sampled at discrete time intervals; time intervals are usually uniform






32. Used for two general purposes: (1) separation of signals that have been combined - and (2) restoration of signals that have been distorted in some way.






33. For any sinusoidal signal with fundamental frequency f 0 - there exists an infinite number of ________frequencies or frequencies which are integer multiples of f 0 .






34. Involves music - speech generation - speech recognition






35. Used for detection and tracking of underwater acoustic signals - consists of a dry end and a wet end - dry end;






36. Signal comprised of a continuous set of values; -not digital or discrete






37. A special case of amplitude modulation - When two sinusoids of different frequencies are multiplied






38. Processing involves improving quality a signal- e.g. image enhancement - data compressions - noise reduction - ________ - filtering - etc.






39. Industry Apps / Major Areas: Telecommunications - Audio Processing - ___________ - Image processing






40. Uses multiplexing - compressions - and echo control






41. Means that sample number zero has a value of one - while all other samples have a value of zero -delta function is frequently called the unit impulse.






42. Process of multiplying a (relatively) low frequency message signal by a high frequency sinusoid






43. Imax-Imin /4*( 2^n - 1)






44. Two separate units - one for tracking targets - one for illumination of targets for weapons guidance (SAMs etc)






45. Controls how much the carrier frequency varies around its unmodulated value.






46. A projection onto real axis