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. 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






2. 12.33 GB; DS/ML






3. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






4. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel






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






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






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






8. Decibels Full Scale






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






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






11. 8.75 GB; DS/SL






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






14. 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






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






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






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






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






19. 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






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






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






22. 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);






23. Same as 'aliasing'






24. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)






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






26. EBU






27. AES






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






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






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






31. MPEG; Standardizing body of audio coding






32. Measure of the amplitude of a longitudinal wave






33. A sample- by- sample operation on two signals






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






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






36. 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






37. 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






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






39. Channels are processed one at a time and the results are stored on multiple CPU buffers that alternately send data as DAW requests the data for playback; First few seconds are relayed to the buffer prior to processing and playback and it continuously






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






41. 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






42. 8- in/8- out on one cable; 25- pin D- sub connector






43. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal






44. 16-Bit; 44.1 kHz; PCM; Stereo






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






46. 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






47. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






48. Eight channel digital surround sound system by Dolby






49. Waveform of a pure tone showing simple harmonic motion






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