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. MPEG; Standardizing body of audio coding






2. A situation where a calculated value cannot fit into the number of digits reserved for it






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






4. 'Reconstructing' part of digital audio






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






6. 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)






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






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






9. Eight channel digital surround sound system by Dolby






10. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






12. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






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






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






15. Visual graph that shows how loud a sound is at different frequencies






16. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path






17. 8.75 GB; DS/SL






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






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






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






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






22. 15.9 GB; DS/DL






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






24. 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






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






26. The amount of energy at each wavelength






27. 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






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






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






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






31. 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






32. Decibels Full Scale






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






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






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






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






37. The frequency range that is allowed through a filter






38. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...






39. The continuous loss of signal strengths as a signal travels through a medium






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






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






42. Roughly around 1 -130 ft/s






43. 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






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






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






46. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently






47. How Loud (Y-Axis) & How Fast (X-Axis)






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






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






50. 16-Bit; 44.1 kHz; PCM; Stereo