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. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






2. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






3. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media






4. 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






5. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM






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






7. 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






8. Allowance of noise floor below that which is required for the final product






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






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






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






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






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






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






15. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range






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






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






18. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1






19. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude






20. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






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






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






24. 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






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






26. 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






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






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






29. 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






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






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






32. 15.9 GB; DS/DL






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






34. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process






35. 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.






36. 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






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






38. 7.95 GB; SS/DL






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






40. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...






41. 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)






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






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






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






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






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






47. Sample Rate x Bit Depth x # of Channels






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






49. 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






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