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. EBU






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






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






4. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






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






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






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






8. 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






9. Waveform of a pure tone showing simple harmonic motion






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






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






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






13. 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






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






15. 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






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






17. Splits the input signal and mixes it with an analog copy so that no latency is present






18. 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






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






20. A situation where a calculated value cannot fit into the number of digits reserved for it






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






22. 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.






23. The amount of energy at each wavelength






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






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






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






27. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.






28. Have odd numbered harmonics






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






30. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz






31. 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






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






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






34. 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






35. A digital filter's time domain output sequence when the input is a single sample is input






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






37. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'






38. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






39. 16-Bit; 44.1 kHz; PCM; Stereo






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






41. The loudest point of a Full Scale system






42. 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






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






44. 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






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






46. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






47. 7.95 GB; SS/DL






48. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






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






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