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






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






3. A method of representing real numbers using a mantissa and an exponent






4. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






5. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






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






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






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






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






10. Each bit in the bit depth is equal to a _____ increase in dynamic range






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






12. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






14. 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






15. 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






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






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






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






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






20. 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






21. Roughly around 1 -130 ft/s






22. Serial Copy Management System; main difference between AES3 & S/PIDF






23. 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






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






25. 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






26. 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






27. 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






28. Accuracy with which an electronic system reproduces the sound or image of its input signal






29. Have odd numbered harmonics






30. 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






31. 15.9 GB; DS/DL






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






33. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






34. 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






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






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






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






38. 8- in/8- out on one cable; 25- pin D- sub connector






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






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






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






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






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






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






45. The amount of energy at each wavelength






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






47. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






48. 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






49. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path






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