Test your basic knowledge |

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. 15.9 GB; DS/DL






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






3. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short






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






5. 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.






6. Sample Rate x Bit Depth x # of Channels






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






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






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






10. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






11. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






12. 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






13. Measure of the amplitude of a longitudinal wave






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






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






16. VBR; Most common & best data reduction technique; Codecs that encode data by determining how dense or sparse areas of the audio are; Can result in buffering issues






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






18. The loudest point of a Full Scale system






19. Have odd numbered harmonics






20. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)






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






22. 16-Bit; 44.1 kHz; PCM; Stereo






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






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






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






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






27. Eight channel digital surround sound system by Dolby






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






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






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






31. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth






32. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






33. 8.75 GB; DS/SL






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






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






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






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






38. The frequency range that is allowed through a filter






39. The amount of energy at each wavelength






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






41. 4.38 GB; SS/SL






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






43. 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






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






45. Decibels Full Scale






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. Waveform of a pure tone showing simple harmonic motion






48. Signal conversions are mixed with playback tracks resulting in near-zero latency






49. 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)






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