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. 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






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






3. 16-Bit; 44.1 kHz; PCM; Stereo






4. Sample Rate x Bit Depth x # of Channels






5. MPEG; Standardizing body of audio coding






6. Same as 'aliasing'






7. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






8. Have odd numbered harmonics






9. 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);






10. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution






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






12. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software






13. The amount of energy at each wavelength






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






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






17. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts






18. 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






19. 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






20. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;






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






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






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






24. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






25. 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






26. 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






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






28. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






29. The frequency above or below which attenuation begins in a filter circuit






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






31. 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






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






33. 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






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






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






36. 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






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






38. 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






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






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






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






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






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






44. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude






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






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






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






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






49. Mixing data and control characters in a single operation






50. 8.75 GB; DS/SL