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






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






3. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution






4. 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






5. 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






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






7. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






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






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






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






11. Subtract place values from the decimal number and place ones or zeros in the correct places






12. Sample Rate x Bit Depth x # of Channels






13. Decibels Full Scale






14. AES






15. 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






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






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






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






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






20. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






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






22. 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






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






24. 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






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






26. 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






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






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






29. 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






30. 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






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






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






33. 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






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






35. 8- in/8- out on one cable; 25- pin D- sub connector






36. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)






37. The loudest point of a Full Scale system






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






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






40. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables






41. 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






42. 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.






43. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience






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






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






46. Series of dots and dashes representing the letters of the alphabet; Most common letters are represented by the shortest dots and dashes; Example of entropy coding






47. 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






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






49. 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






50. Roughly around 1 -130 ft/s