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






2. 16-Bit; 44.1 kHz; PCM; Stereo






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






4. 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






5. EBU






6. 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






7. Accuracy with which an electronic system reproduces the sound or image of its input signal






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






9. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






10. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






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






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






13. Decibels Full Scale






14. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics






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






16. 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






17. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)






18. Very selective method of lowering buffer levels by halting different levels of audio processing






19. 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






20. Data transmission protocol over which computer network traffic travels; Poorly suited to real- time transmission but numerous attempts have been made to harness the technology because of its flexible routing; Uses simple Cat5 cabling; Resists interfe






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






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






23. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector






24. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them






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






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






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






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






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






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






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






32. 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






33. The frequency range that is allowed through a filter






34. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1






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. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers






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






38. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






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






41. 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






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






43. 4.38 GB; SS/SL






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






45. 15.9 GB; DS/DL






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






47. Level above which audible sounds are painful (125 - 130 db)






48. 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






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






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