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. 'Reconstructing' part of digital audio






2. 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






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






4. 12.33 GB; DS/ML






5. Measure of the amplitude of a longitudinal wave






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






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






8. Waveform of a pure tone showing simple harmonic motion






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






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






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






12. EBU






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






14. Decibels Full Scale






15. 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






16. 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






17. 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






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






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. 15.9 GB; DS/DL






21. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






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






23. 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






24. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)






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






26. Sample Rate x Bit Depth x # of Channels






27. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency






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






29. Circuit that seizes voltage values with each tick of an A/D device's internal clock






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






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






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






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






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






35. 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






36. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts






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






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






39. VBR; Most common & best data reduction technique; Codecs that encode data by determining how dense or sparse areas of the audio are; Can result in buffering issues






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






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






42. The loudest point of a Full Scale system






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






44. Cable used to transmit data; Inner cable is surrounded by a plastic insulator - which is surrounded by a wire mesh conductor that insulates the internal signal wire from external interference and an outer casing that functions as a ground






45. A sample- by- sample operation on two signals






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






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






48. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)






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






50. 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