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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 may be broadcast over the radio or internet.






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






3. Consumers can listen to live broadcasts over telephone lines; Individual one- way experience that required a subscription service to listen to performances.






4. The head or top of the guitar where the tuning pegs are located.






5. Tough & rugged; Can work in extremely high SPL environments; Less responsive to transient frequencies b/c of diaphragm mass is heavier than sound waves.






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






7. Device used to measure sound loudness; Often used to measure and balance the loudness of each speaker in a home - studio - or live venue or theater system.






8. Often look like large diaphragm studio mics; Talk or sing into the side of the microphone.






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






10. Stereo coincident pairing where the middle mic (usually a cardiod) is facing source and a bidirectional side mic is placed at 90






11. Dynamic; Cardioid; End Address; Manufactured by Electro Voice; Large Diaphragm; Humbucking Coil; Bass Roll Off Switch; Minimizes proximity effect; Ideal for broadcasting and sound engineering techniques.






12. Sounds that arrive at the 0






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






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






15. Changes in air pressure from the front or the back can cause polarity cancellation; Sides have good rejection; Natural polar pattern is bidirectional.






16. Tube microphone capable of SPL's over 140dB.






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






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






19. 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.






20. The outer covering of a microphone.






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






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






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






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






25. The lowest - and usually most intense - frequency of a complex sound; Most often perceived as the sound's basic pitch.






26. Used in production sound for multiple perspectives on the set; Used in Audio Post to record a number of mics into a recorder with minimal set- up & tear down.






27. French physicist who pioneered piezoelectricity.






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






29. One of the world's greatest condenser microphones prized for the CK12 capsule.






30. Shows the total range of the mic's internal pre- amp; Measured in dB (decibels).






31. One of the oldest mics; Diaphragm mounted on & compresses cup of tiny granules of carbon (100 microns big) that increase current flow when compressed by sound waves and vary electrical current; Also called Resistance Mics;






32. Founded AKG at the end of WWII in Austria.






33. Early example of switchable polar patterns; Had both a dynamic and a ribbon capsule inside of it which when combined produced other polar patterns.






34. 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.






35. 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.






36. Tube with ports down the side with the mic capsule at the bottom; Sounds entering the tube from on - axis interact inside the tube with the sounds coming in through the side ports - an interfere with each other in such a way as to partially cancel of






37. 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.






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






39. Coincident pairing of two bidirectional mics that make a pattern of crossing Figure 8's.






40. Developed the condenser microphone in 1916 at Bell Labs.






41. Basket/grille made out of a specific type of copper wire to block protect the mic from physical damage and to protect the mic from stray RFI






42. - Omnidirectional: 1 - Cardioid: 1.7 - Supercardioid: 1.9 - Hypercardioid: 2 - Bidirectional: 1.7






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






44. A gradual - continuous decrease in low frequency response.






45. Omnidirectional: N/ - Cardioid: 180






46. When miking an amp placing it near the center of this will make it sound brighter; Miking near the outer edge of this will make it sound darker and more mellow in tone.






47. 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.






48. Moving a conductor (a coil of wire) through a magnetic field will cause a voltage to be induced across the conductor.

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49. Tube manufactured for the new version of the AKG C12 (called the C12-A); Powered by Norelco.






50. Derived from two words; 'electr' from electrostatic and 'et' from magnet.







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