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






2. The amount of energy at each wavelength






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






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






5. 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






6. 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






7. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






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






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






10. MPEG; Standardizing body of audio coding






11. 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






12. 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






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






14. 8- in/8- out on one cable; 25- pin D- sub connector






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






16. 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






17. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






18. 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






19. 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






20. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






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






22. 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






23. 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






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






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






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






27. Eight channel digital surround sound system by Dolby






28. 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






29. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






30. Subtract place values from the decimal number and place ones or zeros in the correct places






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






32. Channels are processed one at a time and the results are stored on multiple CPU buffers that alternately send data as DAW requests the data for playback; First few seconds are relayed to the buffer prior to processing and playback and it continuously






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






34. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form






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






36. Difference in brightness between land and pit on a CD Physical Format






37. Sample Rate x Bit Depth x # of Channels






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






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






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






41. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude






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






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






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






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






46. 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.






47. 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






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






49. Measure of the amplitude of a longitudinal wave






50. 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