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






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






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






4. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






5. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






6. The continuous loss of signal strengths as a signal travels through a medium






7. 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






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






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






10. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






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






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






13. Snippets of time in which frequency analysis takes place in a perceptual codec






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






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






16. 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






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






18. 7.95 GB; SS/DL






19. Have odd numbered harmonics






20. Unit of measurement that is equal to one billionth of a meter






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






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






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






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






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






26. 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);






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






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






29. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently






30. AES






31. Mixing data and control characters in a single operation






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






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






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






36. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






37. 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






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






39. 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.






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






41. 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






42. 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






43. 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






44. 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






45. 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






46. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






47. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them






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






49. 'Reconstructing' part of digital audio






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






Can you answer 50 questions in 15 minutes?



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