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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. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby






2. Mixing data and control characters in a single operation






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






4. 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






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






6. Roughly around 1 -130 ft/s






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






8. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






9. 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.






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






11. 7.95 GB; SS/DL






12. 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






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






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






15. 15.9 GB; DS/DL






16. AES






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






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






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






20. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction






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






22. 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






23. The continuous loss of signal strengths as a signal travels through a medium






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






25. Measure of the amplitude of a longitudinal wave






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






27. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel






28. 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






29. 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






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






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






32. Same as 'aliasing'






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






34. 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






35. The frequency above or below which attenuation begins in a filter circuit






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






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






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






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






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






41. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






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






43. A method of representing real numbers using a mantissa and an exponent






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






45. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range






46. 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






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






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






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






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







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