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. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






2. Waveform of a pure tone showing simple harmonic motion






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






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






6. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






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






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






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






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






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






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






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






14. Roughly around 1 -130 ft/s






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






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






17. 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






18. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track






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






20. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.






21. 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);






22. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






23. 15.9 GB; DS/DL






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






25. Have odd numbered harmonics






26. The loudest point of a Full Scale system






27. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals






28. The process of reducing the space required to store data by efficiently encoding the content.






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






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






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






32. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path






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






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






35. The amount of energy at each wavelength






36. 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






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






38. 7.95 GB; SS/DL






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






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






41. Same as 'aliasing'






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






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






44. 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






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






46. Electromagnetic receptor that detects the radiation known as visible light






47. 12.33 GB; DS/ML






48. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process






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






50. The more bits allocated during quantization - the more accurate the measurement