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. 15.9 GB; DS/DL






2. 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






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






4. Increases D/A sample rate from nominal rate to oversampling rate by turning series multi- bit PCM samples into 1- bit samples; (ex. => 44.1kHz sample rate converted to 2.8MHz and simultaneously converts multi- bit samples to 1- bit); Low Pass Filter






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






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






7. 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






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






9. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






10. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






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






12. Measure of the amplitude of a longitudinal wave






13. 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






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






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






16. 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






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






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






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






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






21. Level above which audible sounds are painful (125 - 130 db)






22. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.






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






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






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






26. 8- in/8- out on one cable; 25- pin D- sub connector






27. 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);






28. Splits the input signal and mixes it with an analog copy so that no latency is present






29. 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






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






31. A method of representing real numbers using a mantissa and an exponent






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






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






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






35. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






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






37. 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






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






39. 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






40. 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






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






42. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






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






44. 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






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






46. Branch of psychology concerned with the subjective perception of sound






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






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






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






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