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






2. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






3. Same as 'aliasing'






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






5. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






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






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






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






9. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






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






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






13. 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






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






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






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






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






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. Accuracy with which an electronic system reproduces the sound or image of its input signal






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






21. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






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






23. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range






24. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






25. 4.38 GB; SS/SL






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






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






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






29. The set of rules that computers use to move files from one computer to another on an internet






30. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






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






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






34. 15.9 GB; DS/DL






35. 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






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






37. AES






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






39. 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.






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






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






42. Roughly around 1 -130 ft/s






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






44. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






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






46. 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






47. 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






48. Have odd numbered harmonics






49. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR






50. EBU