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. 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






2. 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






3. 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






4. 12.33 GB; DS/ML






5. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short






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






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






8. 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






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






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






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






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






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






14. Decibels Full Scale






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






16. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






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






18. Process that begins with a fast FFT analysis of the spectra of two input signals - then the multiplication of like frequencies - and IFFT to finalize the process






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






20. A sample- by- sample operation on two signals






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






22. 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






23. 16-Bit; 44.1 kHz; PCM; Stereo






24. The loudest point of a Full Scale system






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






26. Measure of the amplitude of a longitudinal wave






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






28. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






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






30. Each bit in the bit depth is equal to a _____ increase in dynamic range






31. 4.38 GB; SS/SL






32. 8- in/8- out on one cable; 25- pin D- sub connector






33. 8.75 GB; DS/SL






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






35. The amount of energy at each wavelength






36. Waveform of a pure tone showing simple harmonic motion






37. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.






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






39. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






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






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






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






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






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






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






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






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






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






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






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