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






2. 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






3. 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






4. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER






5. Unit of measurement that is equal to one millionth of a meter






6. Eight channel digital surround sound system by Dolby






7. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






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






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






11. 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






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






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






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






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






16. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters






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






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






19. Unit of measurement that is equal to one billionth of a meter






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






21. Roughly around 1 -130 ft/s






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






23. Waveform of a pure tone showing simple harmonic motion






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






25. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






26. 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






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






28. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics






29. Have odd numbered harmonics






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






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






32. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them






33. EDL; Final list of samples used in the audio editing process; Identified by time code






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






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






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






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






38. 'Reconstructing' part of digital audio






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






40. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth






41. 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






42. 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






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






44. 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.






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






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






47. A digital filter's time domain output sequence when the input is a single sample is input






48. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






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






50. 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