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. Decibels Full Scale






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






3. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






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






5. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






6. 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






7. Mixing data and control characters in a single operation






8. 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






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






10. Measure of the amplitude of a longitudinal wave






11. Eight channel digital surround sound system by Dolby






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






13. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector






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






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






16. 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






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






18. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






19. Used as the main disc from which other discs are made; Composed of ground glass with a very fine photoresistor layer; An imaging laser burns pit and land patterns in preparation for duplication






20. A digital filter's time domain output sequence when the input is a single sample is input






21. The loudest point of a Full Scale system






22. 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






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






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






25. Circuit that seizes voltage values with each tick of an A/D device's internal clock






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






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






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






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






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






31. Same as 'aliasing'






32. 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)






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






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






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






36. 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






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






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






39. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data






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






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






42. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals






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






44. 4.38 GB; SS/SL






45. AES






46. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters






47. 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






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






49. The frequency range that is allowed through a filter






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