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






2. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev






3. Roughly around 1 -130 ft/s






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






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






6. Same as 'aliasing'






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






8. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






9. 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






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






11. Low Pressure; Part in a longitudinal wave where the particles are spread apart






12. Eight channel digital surround sound system by Dolby






13. 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






14. The loudest point of a Full Scale system






15. EDL; Final list of samples used in the audio editing process; Identified by time code






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






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






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






19. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






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






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






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






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






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






25. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






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






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






28. The frequency range that is allowed through a filter






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






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






31. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






32. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






33. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






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






35. Level above which audible sounds are painful (125 - 130 db)






36. 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






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






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






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






40. Accuracy with which an electronic system reproduces the sound or image of its input signal






41. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






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






43. Waveform of a pure tone showing simple harmonic motion






44. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






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






46. AES






47. 15.9 GB; DS/DL






48. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






49. 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






50. 8- in/8- out on one cable; 25- pin D- sub connector