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






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






3. 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






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






5. 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






6. 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






7. 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






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






9. The loudest point of a Full Scale system






10. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






11. 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






12. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently






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






14. 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.






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






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






17. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






18. Sample Rate x Bit Depth x # of Channels






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






20. The amount of energy at each wavelength






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






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






23. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






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. 8.75 GB; DS/SL






26. Roughly around 1 -130 ft/s






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






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






29. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






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






31. Subtract place values from the decimal number and place ones or zeros in the correct places






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






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






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






35. 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)






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






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






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






39. 'Capturing' part of digital audio; Never captures a signal perfectly






40. 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






41. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);






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






43. 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






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






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






46. 12.33 GB; DS/ML






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






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






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






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