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






2. 15.9 GB; DS/DL






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






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






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






6. 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






7. 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






8. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification






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






10. Electromagnetic receptor that detects the radiation known as visible light






11. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel






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






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






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






15. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts






16. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






17. Unit of measurement that is equal to one billionth of a meter






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






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






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






21. Same as 'aliasing'






22. 8- in/8- out on one cable; 25- pin D- sub connector






23. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






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






25. 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






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






27. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






28. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






29. 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.






30. 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






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






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






33. Eight channel digital surround sound system by Dolby






34. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range






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






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






37. 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






38. 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






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






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






41. AES






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






43. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






44. 'Reconstructing' part of digital audio






45. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






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






47. 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






48. 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






49. 7.95 GB; SS/DL






50. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate