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






2. Represented mathematically by an indexed sequence of numbers






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






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






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






6. Involves music - speech generation - speech recognition






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






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






9. 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






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






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






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






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






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






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






16. 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






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






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






19. Echo Location uses: radar - sonar - _______






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






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






22. 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 .






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






24. 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.






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






26. 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.






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






28. 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






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






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






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






32. 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






33. A phasor rotating in negative (clockwise) direction






34. A projection onto real axis






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






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






37. Two properties lead to simplifications of mathematical analysis: - __________ - time-invariance






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






39. Processing of signals by digital means






40. Radar - Sonar - Data Communication






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






42. 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.






43. Uses multiplexing - compressions - and echo control






44. 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.






45. Imax-Imin / 2^n - 1






46. 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