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






2. Industry Standards: -6 dB Peak = -20 RMS Meter






3. 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






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






5. 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.






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






7. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;






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






9. 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






10. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data






11. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude






12. 7.95 GB; SS/DL






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






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






15. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






16. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)






17. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






18. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






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






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






22. 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






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






24. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode






25. Difference in brightness between land and pit on a CD Physical Format






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






27. Mixing data and control characters in a single operation






28. MPEG; Standardizing body of audio coding






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






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






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






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






33. Unit of measurement that is equal to one millionth of a meter






34. Signal voltage is relayed to a register from sample- and - hold circuit; Holds reference frequencies in binary form that decrease in value; Finds approximated value & assigns binary number accordingly






35. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);






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






37. Sample Rate x Bit Depth x # of Channels






38. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software






39. 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






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






41. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






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






43. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






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






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






46. 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






47. 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






48. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR






49. 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






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







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