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






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






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






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






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






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






7. 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






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






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






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






11. The frequency range that is allowed through a filter






12. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






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






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






15. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate






16. EBU






17. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.






18. 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






19. 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






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






21. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






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






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






24. 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






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






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






27. 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






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






29. 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






30. 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






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






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






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






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






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






36. 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.






37. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.






38. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






39. Decibels Full Scale






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






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






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






43. 7.95 GB; SS/DL






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






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






46. Mixing data and control characters in a single operation






47. Same as 'aliasing'






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






49. Eight channel digital surround sound system by Dolby






50. High Pressure - Part of a longitudinal wave where the particles of the medium are close together