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






2. 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.






3. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)






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






5. Mixing data and control characters in a single operation






6. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






7. The continuous loss of signal strengths as a signal travels through a medium






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






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






10. 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






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






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






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






14. 8- in/8- out on one cable; 25- pin D- sub connector






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






16. 'Reconstructing' part of digital audio






17. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






18. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics






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






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






21. 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






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






23. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables






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






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






26. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






28. 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






29. 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






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






31. The frequency above or below which attenuation begins in a filter circuit






32. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






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






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






35. 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






36. 7.95 GB; SS/DL






37. 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






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






39. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






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






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






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






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






44. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






45. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






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






47. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short






48. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






49. 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






50. Have odd numbered harmonics