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






2. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response






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






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






5. Same as 'aliasing'






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






7. Increases D/A sample rate from nominal rate to oversampling rate by turning series multi- bit PCM samples into 1- bit samples; (ex. => 44.1kHz sample rate converted to 2.8MHz and simultaneously converts multi- bit samples to 1- bit); Low Pass Filter






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






9. AES






10. Sample Rate x Bit Depth x # of Channels






11. 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






12. 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






13. 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






14. Measure of the amplitude of a longitudinal wave






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






16. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal






17. 8- in/8- out on one cable; 25- pin D- sub connector






18. 15.9 GB; DS/DL






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






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






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






22. The loudest point of a Full Scale system






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






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






25. 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






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






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






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






29. 8.75 GB; DS/SL






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






31. 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






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






33. 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






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






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






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






37. 'Capturing' part of digital audio; Never captures a signal perfectly






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






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






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






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






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






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






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






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






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






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






48. 12.33 GB; DS/ML






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






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