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Digital Audio

Subject : engineering
Instructions:
  • Answer 50 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. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






2. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'






3. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






4. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






5. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






6. 12.33 GB; DS/ML






7. 7.95 GB; SS/DL






8. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers






9. Cable used to transmit data; Inner cable is surrounded by a plastic insulator - which is surrounded by a wire mesh conductor that insulates the internal signal wire from external interference and an outer casing that functions as a ground






10. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






11. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev






12. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






13. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






14. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics






15. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1






16. The difference in volume between the loudest and quietest sounds of a source






17. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






18. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude






19. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc






20. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.






21. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






22. More accuracy in low amplitudes and less in higher amplitudes






23. How Loud (Y-Axis) & How Fast (X-Axis)






24. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response






25. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






26. Electromagnetic receptor that detects the radiation known as visible light






27. 8- in/8- out on one cable; 25- pin D- sub connector






28. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






29. Measure of the amplitude of a longitudinal wave






30. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path






31. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






32. The set of rules that computers use to move files from one computer to another on an internet






33. Visual graph that shows how loud a sound is at different frequencies






34. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector






35. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics






36. Anytime bit depth is reduced the gap gets bigger so more dithering is required






37. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






38. Softest sound that can be heard by the average human ear (0 dB)






39. Process that begins with a fast FFT analysis of the spectra of two input signals - then the multiplication of like frequencies - and IFFT to finalize the process






40. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage






41. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)






42. Having a repeated succession of waves or curves as in a sound waveform






43. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio






44. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization






45. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






46. Used as the main disc from which other discs are made; Composed of ground glass with a very fine photoresistor layer; An imaging laser burns pit and land patterns in preparation for duplication






47. Snippets of time in which frequency analysis takes place in a perceptual codec






48. Very selective method of lowering buffer levels by halting different levels of audio processing






49. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






50. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency







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