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. 8.75 GB; DS/SL






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






3. AES






4. 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






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






6. EBU






7. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






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






9. 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)






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






11. 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'






12. The frequency range that is allowed through a filter






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






14. 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);






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






16. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel






17. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range






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






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






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






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






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






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






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






25. 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






26. 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






27. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal






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






29. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






30. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency






31. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






32. 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






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






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






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






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






37. Have odd numbered harmonics






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






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






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






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






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






43. 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






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






45. 15.9 GB; DS/DL






46. 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






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






48. 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






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






50. 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