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. Electromagnetic receptor that detects the radiation known as visible light






2. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal






3. Decibels Full Scale






4. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






6. 8.75 GB; DS/SL






7. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC






8. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






9. 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






10. 8- in/8- out on one cable; 25- pin D- sub connector






11. 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






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






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






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






15. 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






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






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






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






19. 4.38 GB; SS/SL






20. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response






21. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






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






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






24. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






25. 'Reconstructing' part of digital audio






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






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






28. 12.33 GB; DS/ML






29. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






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






31. The more bits allocated during quantization - the more accurate the measurement






32. 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






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






34. 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






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






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






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






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






39. 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






40. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution






41. 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






42. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






43. Anytime bit depth is reduced the gap gets bigger so more dithering is required






44. 16-Bit; 44.1 kHz; PCM; Stereo






45. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth






46. 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






47. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






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






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