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






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






3. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






5. 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






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






7. Eight channel digital surround sound system by Dolby






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






9. Decibels Full Scale






10. 15.9 GB; DS/DL






11. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






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






13. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)






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






15. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz






16. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio






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






18. Mixing data and control characters in a single operation






19. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






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






21. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software






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






23. 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






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






25. 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






26. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency






27. 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






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






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






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






31. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals






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






33. Signal voltage is relayed to a register from sample- and - hold circuit; Holds reference frequencies in binary form that decrease in value; Finds approximated value & assigns binary number accordingly






34. 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






35. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






36. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction






37. 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






38. Each bit in the bit depth is equal to a _____ increase in dynamic range






39. Measure of the amplitude of a longitudinal wave






40. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'






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






42. 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






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






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






45. 7.95 GB; SS/DL






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






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






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






49. 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






50. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts