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. 8.75 GB; DS/SL






2. Decibels Full Scale






3. 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






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






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






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






7. 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






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






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






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






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






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






13. Measure of the amplitude of a longitudinal wave






14. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones






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






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






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






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. MPEG; Standardizing body of audio coding






20. 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






21. Fractional part of a floating- point number; Also called the mantissa; Defines precision






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






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






24. Sample Rate x Bit Depth x # of Channels






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






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






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






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






29. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






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






31. 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






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






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






34. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






35. 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






36. The amount of energy at each wavelength






37. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






38. 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






39. 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






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






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






42. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization






43. 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






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






45. Visual graph that shows how loud a sound is at different frequencies






46. Eight channel digital surround sound system by Dolby






47. 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






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






49. Unit of measurement that is equal to one billionth of a meter






50. 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







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