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






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. A phasor rotating in negative (clockwise) direction






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






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






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






7. 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






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






9. Uses multiplexing - compressions - and echo control






10. 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






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






12. 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






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






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






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






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






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






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






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






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






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






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






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






24. Echo Location uses: radar - sonar - _______






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






26. Processing of signals by digital means






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






28. 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






29. Radar - Sonar - Data Communication






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






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






32. 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 .






33. Imax-Imin / 2^n - 1






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






35. 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






36. Involves music - speech generation - speech recognition






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






38. Represented mathematically by an indexed sequence of numbers






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






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






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






42. 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.






43. 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.






44. 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.






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






46. A projection onto real axis