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Microphones Theory

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. Sounds that arrive from angles other than the 0






2. 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.






3. Cable wrapping method that keeps every coil on top of the next; May cause interference and tiny curls or tangles.






4. Measurement of the mic's sensitivity; Measured in mV/Pa (millivolts per Pascal).






5. Phenomenon causing carbon microphones to lose sensitivity as granules become packed together over extended use; To remedy problem mic is gently rapped on hard surface.






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






7. Polar pattern produced when you add a little bit of bidirectional to the omni pattern.






8. Considered to be the best mic ever made; VF14 Tube.






9. Device or transducer used for converting sound waves or acoustical energy into electrical energy






10. Known as 'The Bottle' this was the first mass - produced condenser mic.






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






12. Causes an increase in low frequency response as one gets closer to the source.






13. + (only); (Front capsule alone)






14. 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.






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






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






17. Often look like handheld vocal mics; Talk or sing into the end of the microphone.






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






19. French physicist who pioneered piezoelectricity.






20. Used in adverse conditions to protect from elements like sand - or dust.






21. When using multiple microphones - the distance between microphones should be at least 3 times the distance from each microphone to its intended sound source.






22. Condenser; Cardioid; Side Address; 48V Required; Large Diaphragm; Manufactured by Rode; Widely recognised as the world's quietest studio microphone; Ideal for vocals - voiceover - and acoustic instruments.






23. Coincident pairing that is at 90






24. Pure polar pattern that receives sound from both the front and back; Also known as a 'Figure 8' pattern; More proximity effect that Cardioid or Hyper Cardioid; Often found in ribbon mics.






25. When using two microphones reverse the polarity of the bottom mic.






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






27. DC Voltage Req'd for capsule polarizing voltage and internal mic preamps; 3 sources: External Power Supply Unit (PSU); Phantom Power; Battery.






28. Close mic placement can help guard again bleed from other instruments and takes advantage of proximity effect; Center of cone = Brighter; Outside of cone = Darker; Reflections can create phase issues (can be reduced by putting the cabinet at an angle






29. Bioacoustic Research; Documentary Journalism; Radio; Film/TV Production; Audio Post Production.






30. Proportional to: Magnetic field strength; Length of the conductor; Velocity of conductor moving through the magnetic field.






31. Captures sounds arriving 90






32. 4 to 6 ft. from the player; Mic should be placed below the line of sight of the bell - rotated at about 40 degrees off- axis - and tilted upward.






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






34. Fixed plate that is charged with polarized voltage found in condenser mics; Usually constructed of milled brass; Has a number of holes drilled in it to provide damping for diaphragm.






35. Verify that the boom is placed over a microphone leg prior to use to provide added balance and stability.






36. Sensitive in a narrower pattern in the front than a cardioid and has a prominent/pronounced lobe at rear; Rejects most signals from 110






37. Configured to simulate the spacing and directivity of human hearing; Box shape with two 'ears' on each side.






38. Allow sound to reach the rear of the capsule/diaphragm - to create cardioid - supercardioid - and hypercardioid patterns In single capsule pressure gradient microphones.






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






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






41. First microphone invented by Georg Neumann






42. Stereo configuration using a spaced pair 3-10 feet apart.






43. Voltage applied to piezoelectric material will cause it to deform or change shape; NO PHANTOM POWER!






44. Angle of maximum signal rejection in a microphone polar pattern.






45. Aluminum Ribbon - Bi-Polar (Figure 8); Side Address; Manufactured by Shiny Box; Buttery mid- range improves digital recordings and smooths out modern treble; Best on drums - piano - overheads - and vocals where treble is focused.






46. Omnidirectional: N/ - Cardioid: 180






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






48. Measurement of Sound Pressure; stated as being N/m2 with a Newton being a measurement of force equal to about 9.8 lbs; Equal to 94dB SPL






49. Extremely narrow area of sensitivity in front with extended reach; Also has multiple lobes which vary in position with frequency; Not made from combining pure patterns - but created by using an interference tube.






50. Dynamic; Cardioid; End Address; Manufactured by Shure; Popular musicians' choice due to its sturdy construction and ability to work well with instruments that produce high sound pressure levels.







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