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






2. 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






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






4. The set of rules that computers use to move files from one computer to another on an internet






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






6. 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






7. 7.95 GB; SS/DL






8. Waveform of a pure tone showing simple harmonic motion






9. More accuracy in low amplitudes and less in higher amplitudes






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






11. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






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






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






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






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






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






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






18. Having a repeated succession of waves or curves as in a sound waveform






19. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






20. 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






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






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






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






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






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






26. 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






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






28. The amount of energy at each wavelength






29. 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






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






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






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






33. Have odd numbered harmonics






34. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






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






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






37. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER






38. 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)






39. 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






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






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






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






43. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






44. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude






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






46. MPEG; Standardizing body of audio coding






47. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






48. Visual graph that shows how loud a sound is at different frequencies






49. 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






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