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






2. 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






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






4. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






5. 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






6. 4.38 GB; SS/SL






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






8. The loudest point of a Full Scale system






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






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






11. Fractional part of a floating- point number; Also called the mantissa; Defines precision






12. Splits the input signal and mixes it with an analog copy so that no latency is present






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






14. 16-Bit; 44.1 kHz; PCM; Stereo






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






16. 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)






17. 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






18. The amount of energy at each wavelength






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






20. 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






21. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






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






23. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz






24. EBU






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






26. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






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






28. Decibels Full Scale






29. Waveform of a pure tone showing simple harmonic motion






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






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






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






33. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector






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






35. Subtract place values from the decimal number and place ones or zeros in the correct places






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






37. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification






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






39. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'






40. The frequency range that is allowed through a filter






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






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






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






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






45. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response






46. 'Reconstructing' part of digital audio






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






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






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






Can you answer 50 questions in 15 minutes?



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