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






2. Roughly around 1 -130 ft/s






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






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






5. Softest sound that can be heard by the average human ear (0 dB)






6. 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






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






8. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






9. CobraNet; EtherSound; Dante; AVB (currently under development)






10. 'Reconstructing' part of digital audio






11. Unit of measurement that is equal to one millionth of a meter






12. 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






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






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






15. The frequency range that is allowed through a filter






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






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






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






19. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






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






21. 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






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






23. 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'






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






25. Mixing data and control characters in a single operation






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






27. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






28. 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






29. 15.9 GB; DS/DL






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






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






32. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio






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






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






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






37. Waveform of a pure tone showing simple harmonic motion






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






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






40. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






42. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






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






44. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






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






46. EBU






47. 8.75 GB; DS/SL






48. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






49. Low Pressure; Part in a longitudinal wave where the particles are spread apart






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