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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. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC






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






3. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector






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






5. 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






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






7. Each bit in the bit depth is equal to a _____ increase in dynamic range






8. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo






9. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






10. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM






11. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






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






13. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






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






16. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them






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






18. Have odd numbered harmonics






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






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






21. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






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






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






24. 12.33 GB; DS/ML






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






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






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






28. Sample Rate x Bit Depth x # of Channels






29. 7.95 GB; SS/DL






30. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form






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






32. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts






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






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






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






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






37. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






38. Same as 'aliasing'






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






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






41. 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






42. Decibels Full Scale






43. 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






44. 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






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






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






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






48. 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






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






50. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.







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