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






2. The frequency range that is allowed through a filter






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






4. Eight channel digital surround sound system by Dolby






5. 7.95 GB; SS/DL






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






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






8. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media






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






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






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






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






13. Channels are processed one at a time and the results are stored on multiple CPU buffers that alternately send data as DAW requests the data for playback; First few seconds are relayed to the buffer prior to processing and playback and it continuously






14. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon






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






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






17. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage






18. 8.75 GB; DS/SL






19. 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






20. Cable used to transmit data; Inner cable is surrounded by a plastic insulator - which is surrounded by a wire mesh conductor that insulates the internal signal wire from external interference and an outer casing that functions as a ground






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






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






23. 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






24. 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






25. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






26. 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.






27. Decibels Full Scale






28. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






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






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






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






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






33. The loudest point of a Full Scale system






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






35. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






36. 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






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






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






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






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






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






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






43. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






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






45. 15.9 GB; DS/DL






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






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






48. Sample Rate x Bit Depth x # of Channels






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