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. Decibels Full Scale






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






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






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






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






6. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






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






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






9. A sample- by- sample operation on two signals






10. 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






11. The frequency range that is allowed through a filter






12. 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






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






14. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR






15. 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






16. 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






17. 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






18. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






19. 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






20. Softest sound that can be heard by the average human ear (0 dB)






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






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






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






24. The loudest point of a Full Scale system






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






26. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






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






28. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated






29. AES






30. 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






31. Have odd numbered harmonics






32. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal






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






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






35. 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






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






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






38. Sample Rate x Bit Depth x # of Channels






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






40. 'Reconstructing' part of digital audio






41. Waveform of a pure tone showing simple harmonic motion






42. 12.33 GB; DS/ML






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






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






45. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






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






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






48. 8.75 GB; DS/SL






49. The amount of energy at each wavelength






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