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. 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






2. Industry Standards: -6 dB Peak = -20 RMS Meter






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






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






5. 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






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






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






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






9. 8.75 GB; DS/SL






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






11. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






12. 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






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






14. 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






15. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






16. EBU






17. Mixing data and control characters in a single operation






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






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






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






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. MPEG; Standardizing body of audio coding






23. 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






24. The process of reducing the space required to store data by efficiently encoding the content.






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






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






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






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






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






30. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






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






33. Roughly around 1 -130 ft/s






34. 8- in/8- out on one cable; 25- pin D- sub connector






35. Eight channel digital surround sound system by Dolby






36. 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






37. The frequency range that is allowed through a filter






38. 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






39. 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






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






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






42. The amount of energy at each wavelength






43. 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






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






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






46. 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






47. 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






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






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






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