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






2. Eight channel digital surround sound system by Dolby






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






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






5. 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






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






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






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






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






10. 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






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. A sample- by- sample operation on two signals






13. 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






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






15. 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






16. 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






17. Multi-Bit Words; (Pulse Code Modulation)






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






19. The loudest point of a Full Scale system






20. 15.9 GB; DS/DL






21. 7.95 GB; SS/DL






22. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)






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






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






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






26. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






27. 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






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






29. The frequency range that is allowed through a filter






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






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






32. Roughly around 1 -130 ft/s






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






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






35. 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






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






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






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






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






40. 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






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






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






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






44. 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






45. 16-Bit; 44.1 kHz; PCM; Stereo






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






47. 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






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






49. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






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