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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. The part of the guitar you turn to tune the strings in order to get the right sound out of the guitar when one plays.






2. Quartz; Barium Titaniate - Tourmaline; Rochelle Salt - and even cane sugar.






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






4. 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.






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






6. 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.






7. Tough & rugged microphone that contains an element consisting of a dome- shaped diaphragm and a moving 'voice coil'; Operates on principles of magnetic induction.






8. Condenser; Cardioid/Hypercardioid; End Address; 48V Required; Manufactured by AKG; Can be powered by internal 9 V battery for field recording; Improves clarity of speech with the PB 1000 Presence Boost Adapter.






9. Very robust and durable; Used in telephones until 1990's; Currently finds applications for military use.






10. Sounds that may be broadcast over the radio or internet.






11. Vintage Tube Mics hold voltage after being unplugged; Be sure grounds are connected to power cord and that the charge has left microphone prior to striking.






12. 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.






13. 1 Bidirectional & 1 Cardioid placed coincidentally; Bidirectional faces left and right and cardioid faces the sound; Gives control of the focus and size of the stereo image;






14. Pair of cardioids facing to the front and rear - plus a sideways - facing figure 8; Mid- sides pair plus another rear- facing cardioid which is combined with the same Figure 8 mic for the surrounds.






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






16. Radio Frequency Interference






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






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






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






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






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






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






23. 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






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






25. Omnidirectional: 360






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






27. 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.






28. Timing difference between two waves; Waves interfere cancelling each other out and altering frequency response; Measured in degrees; Can be caused by reflections of sound waves; Can be reduced by putting cabinet or amp at an angle.






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






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






31. To capture two perspectives on the same sound.






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






33. German broadcasting stereo mic technique; An X-Y type with the mics 20cm apart and at a 90






34. Small coil of wire wrapped around the plastic or aluminum diaphragm of a dynamic microphone.






35. Shows the max sound pressure level possible with a certain amount of distortion; Measured in dB (decibels).






36. Carbon; Ceramic/Crystal; Magnetic/Dynamic; Ribbon; Condenser






37. Used to filter heating current in certain mics; Invented by Georg Neumann.






38. 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.






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






40. The property of certain crystals that causes them to produce voltage when a mechanical pressure such as sound vibrations is applied to them; Originates from Greek word 'piezein' (to compress).






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






42. This is what is measured to produce an electrical signal in condenser mics; This changes as sound waves strike the diaphragm causing the distance to the back plate to change.






43. Captures sounds arriving 90






44. Use coincident or near coincident pairings; Too many microphones will cause phasing issues.






45. Coincident pairing that is at 90






46. Dutch broadcasting stereo mic technique; An X-Y type with the mics 30cm apart and at a 90






47. 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.






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






49. Forward facing bipolar mics spaced 20cm apart.






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







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