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






2. 15.9 GB; DS/DL






3. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






4. 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)






5. 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






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






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






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






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






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






11. 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






12. 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






13. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






14. 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






15. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'






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






17. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form






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






19. 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






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






21. 'Reconstructing' part of digital audio






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






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






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






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






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






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






28. 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






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






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






31. Waveform of a pure tone showing simple harmonic motion






32. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






33. 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






34. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






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






36. 8- in/8- out on one cable; 25- pin D- sub connector






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






38. 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






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






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






41. 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






42. Same as 'aliasing'






43. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






44. 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






45. 12.33 GB; DS/ML






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






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






48. The amount of energy at each wavelength






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






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







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