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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. 'Capturing' part of digital audio; Never captures a signal perfectly






2. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience






3. 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






4. CobraNet; EtherSound; Dante; AVB (currently under development)






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






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






7. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate






8. Roughly around 1 -130 ft/s






9. Waveform of a pure tone showing simple harmonic motion






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






11. Decibels Full Scale






12. High Pressure - Part of a longitudinal wave where the particles of the medium are close together






13. Multi-Bit Words; (Pulse Code Modulation)






14. 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






15. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones






16. 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






17. Eight channel digital surround sound system by Dolby






18. When recording you want the smallest buffer available; When mixing you want the largest buffer available






19. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples






20. AES






21. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






22. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






23. A digital filter's time domain output sequence when the input is a single sample is input






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






25. The more bits allocated during quantization - the more accurate the measurement






26. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters






27. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






28. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process






29. EDL; Final list of samples used in the audio editing process; Identified by time code






30. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel






31. 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






32. Circuit that seizes voltage values with each tick of an A/D device's internal clock






33. Allowance of noise floor below that which is required for the final product






34. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






35. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables






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






37. A situation where a calculated value cannot fit into the number of digits reserved for it






38. The process of reducing the space required to store data by efficiently encoding the content.






39. Level above which audible sounds are painful (125 - 130 db)






40. MPEG; Standardizing body of audio coding






41. Same as 'aliasing'






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






43. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated






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






45. Serial Copy Management System; main difference between AES3 & S/PIDF






46. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






47. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






48. Unit of measurement that is equal to one billionth of a meter






49. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






50. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals







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