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. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables






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






3. Decibels Full Scale






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






5. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






6. 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






7. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






8. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);






9. 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






10. 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






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






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






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






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






15. Same as 'aliasing'






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






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






18. 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






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






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






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






22. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






23. Mixing data and control characters in a single operation






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






25. 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






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






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






28. 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






29. The amount of energy at each wavelength






30. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






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






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






33. 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)






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






35. 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






36. 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






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






38. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






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






40. When recording you want the smallest buffer available; When mixing you want the largest buffer available






41. 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






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






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






44. 8.75 GB; DS/SL






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






46. 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






47. 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






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






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






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