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. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'






2. The loudest point of a Full Scale system






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






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






5. Waveform of a pure tone showing simple harmonic motion






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






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






8. 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)






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






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






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






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






13. 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






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






15. 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






16. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification






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






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






19. Roughly around 1 -130 ft/s






20. 15.9 GB; DS/DL






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






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






23. 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






24. 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






25. 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






26. Cable used to transmit data; Inner cable is surrounded by a plastic insulator - which is surrounded by a wire mesh conductor that insulates the internal signal wire from external interference and an outer casing that functions as a ground






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






28. Mixing data and control characters in a single operation






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






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






31. Industry Standards: -6 dB Peak = -20 RMS Meter






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






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






34. Eight channel digital surround sound system by Dolby






35. Difference in brightness between land and pit on a CD Physical Format






36. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...






37. 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






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






39. 7.95 GB; SS/DL






40. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






41. Have odd numbered harmonics






42. 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






43. 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






44. 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






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






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






47. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media






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






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






50. 12.33 GB; DS/ML