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. 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






2. Waveform of a pure tone showing simple harmonic motion






3. 4.38 GB; SS/SL






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






5. EBU






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






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






8. 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






9. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






10. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






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






12. Have odd numbered harmonics






13. 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)






14. 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)






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






16. 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






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






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






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






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






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






22. Eight channel digital surround sound system by Dolby






23. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them






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






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






26. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics






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






28. 16-Bit; 44.1 kHz; PCM; Stereo






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






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






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






32. 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






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






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. 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






36. 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






37. 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






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






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






40. The frequency range that is allowed through a filter






41. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






42. 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






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






44. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude






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






46. Sample Rate x Bit Depth x # of Channels






47. 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






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






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






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