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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. Multi-Bit Words; (Pulse Code Modulation)






2. 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






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






4. The frequency range that is allowed through a filter






5. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






6. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby






7. Have odd numbered harmonics






8. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






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






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






11. 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






12. 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






13. Roughly around 1 -130 ft/s






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






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






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






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






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






19. 7.95 GB; SS/DL






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






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






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






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






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






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






26. The loudest point of a Full Scale system






27. 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






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






29. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






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






31. 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






32. 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






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






34. Mixing data and control characters in a single operation






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






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






37. 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






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






39. 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






40. Eight channel digital surround sound system by Dolby






41. Waveform of a pure tone showing simple harmonic motion






42. 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






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






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






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






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






47. 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






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






49. 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






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






Can you answer 50 questions in 15 minutes?



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