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






2. EBU






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






4. When recording you want the smallest buffer available; When mixing you want the largest buffer available






5. 15.9 GB; DS/DL






6. MPEG; Standardizing body of audio coding






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






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






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






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






11. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones






12. Very selective method of lowering buffer levels by halting different levels of audio processing






13. Roughly around 1 -130 ft/s






14. 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






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






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






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






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






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






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






21. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage






22. 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






23. 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






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






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






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






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






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






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






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






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






32. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo






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






34. Splits the input signal and mixes it with an analog copy so that no latency is present






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






36. 4.38 GB; SS/SL






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






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






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






40. Fractional part of a floating- point number; Also called the mantissa; Defines precision






41. 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






42. 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






43. 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)






44. Decibels Full Scale






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






46. CobraNet; EtherSound; Dante; AVB (currently under development)






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






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






49. Mixing data and control characters in a single operation






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