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. 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






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






3. 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






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






5. 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.






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






7. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






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






9. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






10. Measure of the amplitude of a longitudinal wave






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






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






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






14. 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






15. More accuracy in low amplitudes and less in higher amplitudes






16. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track






17. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






18. 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






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






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






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






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






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






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






25. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






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






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






28. 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






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






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






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






32. Mixing data and control characters in a single operation






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






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






35. AES






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






37. 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






38. 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






39. 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.






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






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






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






43. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






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






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






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






47. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






48. EBU






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






50. 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