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






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






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






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






5. 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






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






7. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode






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






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






10. The amount of energy at each wavelength






11. 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






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






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






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






15. The frequency range that is allowed through a filter






16. Same as 'aliasing'






17. 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






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






19. 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






20. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






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






22. Mixing data and control characters in a single operation






23. 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)






24. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






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






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






27. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






28. 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






29. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software






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






31. 'Reconstructing' part of digital audio






32. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






33. Eight channel digital surround sound system by Dolby






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






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






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






37. 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






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






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






40. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters






41. 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






42. 7.95 GB; SS/DL






43. Multi-Bit Words; (Pulse Code Modulation)






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






45. Have odd numbered harmonics






46. When recording you want the smallest buffer available; When mixing you want the largest buffer available






47. 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.






48. 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






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






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