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






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






3. The amount of energy at each wavelength






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






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






6. 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






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






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






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






10. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






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






12. 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






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






14. Branch of psychology concerned with the subjective perception of sound






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






16. 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.






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






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






19. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






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






21. 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






22. Data transmission protocol over which computer network traffic travels; Poorly suited to real- time transmission but numerous attempts have been made to harness the technology because of its flexible routing; Uses simple Cat5 cabling; Resists interfe






23. 4.38 GB; SS/SL






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






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






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






27. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);






28. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






29. 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






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






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






32. 12.33 GB; DS/ML






33. Process that begins with a fast FFT analysis of the spectra of two input signals - then the multiplication of like frequencies - and IFFT to finalize the process






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






35. Decibels Full Scale






36. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track






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






38. Allowance of noise floor below that which is required for the final product






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






40. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency






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






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






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






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






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






46. 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






47. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






48. Same as 'aliasing'






49. 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






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