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






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






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






4. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel






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






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






7. Decibels Full Scale






8. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM






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






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






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






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






13. 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






14. 4.38 GB; SS/SL






15. Have odd numbered harmonics






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






17. 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






18. 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






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






20. 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.






21. 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






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






23. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






24. Mixing data and control characters in a single operation






25. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






26. 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






27. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






29. 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






30. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'






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






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






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






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






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






36. Same as 'aliasing'






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






38. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data






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






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






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






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






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






44. 8- in/8- out on one cable; 25- pin D- sub connector






45. The amount of energy at each wavelength






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






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






48. 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






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






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