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. 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






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






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






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






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






6. 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






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






8. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics






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






10. 7.95 GB; SS/DL






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






12. The loudest point of a Full Scale system






13. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path






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






15. 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






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






17. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






19. 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






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






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






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






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






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






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






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






27. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon






28. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples






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






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






31. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






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






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






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






35. 'Reconstructing' part of digital audio






36. 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






37. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev






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






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






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






41. AES






42. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






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






45. Decibels Full Scale






46. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






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






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






49. 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);






50. 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