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. A sample- by- sample operation on two signals






2. The loudest point of a Full Scale system






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






4. 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






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






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






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






8. 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






9. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






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






11. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification






12. 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






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






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






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






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






17. Industry Standards: -6 dB Peak = -20 RMS Meter






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






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






20. 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






21. 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






22. Roughly around 1 -130 ft/s






23. Waveform of a pure tone showing simple harmonic motion






24. 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






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






26. Sample Rate x Bit Depth x # of Channels






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






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






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






30. 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






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






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






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






34. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






35. 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






36. Decibels Full Scale






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






38. 'Reconstructing' part of digital audio






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






40. 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






41. Same as 'aliasing'






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






43. Measure of the amplitude of a longitudinal wave






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






45. 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






46. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






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






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






50. 8.75 GB; DS/SL