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Microphones Theory

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. Condenser; Multiple; Side Address; 48V Required; Manufactured by AKG; Dual Diaphragm; Nine selectable pickup patterns; Peak Hold LED; The reference microphone for almost all comparative microphone tests.






2. Coincident pairing that is at 90






3. Pure polar pattern with which the microphone is equally sensitive in all directions; Great for capturing ambiance or room reverb.






4. Used by government agencies to determine safe sound exposure levels (in dB) over a period of time; 85 - 90 dB = 16 hrs. of safe exposure time at 85 dB; Decreases to 8 hrs. of safe exposure time at 90 dB.






5. Small Diaphragm Electret condensers; Extremely flat frequency response; Omnidirectional pattern.






6. Pair of omni mic elements mounted on opposite sides of a spherical shaped capsule.






7. The moving plate of a condenser capacitor; Constructed of a thin piece of metal or thin plastic - such as Mylar - coated with gold or nickel; .05 - 10 microns thick.






8. Most sensitive to sounds arriving from the front while rejecting sounds from rear; Shaped like a heart; Rejects most signals from 180






9. The reduction in the amplitude of a wave due to the dissipation of wave energy.






10. To capture two perspectives on the same sound.






11. Bell Labs scientist that was an innovator of many spaced pair and arrayed miking techniques.






12. More compelling sound - giving both depth and perspective.






13. Mounts on a single stand to provide for adjustable spacing and angling between mics.






14. Mic in which the diaphragm moves in response to sound waves and an attached pin/rod moves; Coil attached to pin/rod moves alone with the diaphragm.






15. Microphone with 4 large diaphragm condenser capsules; 3 bidirectional and 1 omni; Can be combined to make any polar pattern.






16. Using omnidirectional as a reference of 1 - this is a measurement of how much farther you can be from a mic to achieve equal output level in other polar pattern microphones.






17. Allows all low frequencies to pass; Blocks the higher frequencies from being processed.






18. 2 - 4 ft. from player; Placed below the line of sight of the bell - rotated at about 30 degrees off axis - and tilted upward.






19. The first AKG dynamic microphone.






20. Will yield a 6dB increase in output - but will cause a loss of high frequency response.






21. An extremely strong acoustic nano- film designed to replace the foil ribbon in ribbon microphones.






22. Works exactly like condenser mic but one of the two plates is manufactured as a capsule with a permanent static charge so there is no external power source necessary; Requires phantom or battery to charge internal mic preamp.






23. French broadcasting stereo mic technique; An X-Y type with the mics 17cm apart and at a 110






24. An electrical device characterized by its capacity to store an electric charge;






25. Reduces the power of a signal used when the trim itself cannot prevent overload in the mic line level signal.






26. Best signal- to- noise ratio; Minimal phase cancellation; Quality representation of what is being recorded; Attempt to ignore unwanted external noise.






27. Part of a mic stand that the mic stands on.






28. E = Blv - e - Electromotive Force (in volts) - B - is the magnetic field strength - l - is the length of the conductor - v - is the velocity of the conductor moving through the magnetic field






29. Overall measurement close to the overall sound level in frequency response charts.






30. The graphic representation plot of the sensitivity of a microphone from any direction over a 360






31. An instrument for detecting sound transmitted through water commonly manufactured using ceramic piezoelectric material.






32. Sub- frequency (below 100Hz) capture device designed for use with kick drums and floor toms as an alternative or supplement to a traditional microphone.






33. Device used to calibrate sound pressure measurement devices; Emits a single 1 kHz frequency over a sustained period of time.






34. Sounds that arrive from angles other than the 0






35. Allows all high frequencies to pass; Blocks the lower frequencies from being processed.






36. The outer covering of a microphone.






37. Flat plate that controls or directs the flow of sound energy in a crystal/ceramic mic.






38. Mics placed in front of an instrument or ensemble (in a left/right fashion) to obtain an overall stereo image; Sound more open and natural; Weaker center image than X/Y; Great for creating background sounds that will blend in with foreground sounds.






39. Microphone consisting of two parallel metal plates - each holding an opposing charge (+ or -) and thus creating a capacitor to induce an electrical charge as sound waves move the diaphragm; Require a solid- state or tube preamplifier.






40. The attachment that holds a microphone in place on the mic stand; Comes in various shapes - sizes - and applications.






41. Condenser; Cardioid; Side Address; 48V Required; Large Diaphragm; Manufactured by AudioTechnica; Transformerless circuitry virtually eliminates low- frequency distortion.






42. Pair of omni mic separated by a circular absorptive baffle.






43. Delicate and require extreme care; NO PHANTOM POWER; Becoming more popular than ever because of highly efficient magnets - lower manufacturing costs - and great fidelity.






44. Digital device used to Fourier Forms; Used to measure the specific number of sine waves in a specific frequency in a specific setting.






45. Modeled to mimic a human head for extremely good spatialization; Shaped like a human head.






46. Measurement similar to how our hearing works in frequency response charts.






47. A 3- mic array using omni mics with left - right and center placement; Center is placed about 5 ft. closer to the source to eliminate 'holes' in the middle and the center levels are reduced for an even sound; Forms a triangle.






48. Raises the body of the microphone increasing height.






49. + & + (Front & rear in equal positive amounts)






50. Commonly found in acoustic guitar pickups; Ceramic piezoelectric material is used in hydrophones (underwater mics) because of durability.







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