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






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






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






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






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






6. 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)






7. Measure of the amplitude of a longitudinal wave






8. 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






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






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






11. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






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






13. 'Reconstructing' part of digital audio






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






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






16. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage






17. 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






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






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






20. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers






21. 8.75 GB; DS/SL






22. Decibels Full Scale






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






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






25. 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






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






27. Waveform of a pure tone showing simple harmonic motion






28. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;






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






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






32. Have odd numbered harmonics






33. 15.9 GB; DS/DL






34. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






35. 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






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






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






38. 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






39. The process of reducing the space required to store data by efficiently encoding the content.






40. MPEG; Standardizing body of audio coding






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






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






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






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






45. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






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






47. The loudest point of a Full Scale system






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






49. 8- in/8- out on one cable; 25- pin D- sub connector






50. 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