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






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






3. 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.






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






5. The outer covering of a microphone.






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






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






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






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






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






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






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






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






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






15. Used to make sure you have accurate angles & capsule spacing when miking in stereo.






16. To break down or disassemble any portion of a set or stage set- up.






17. Solid state version of the U67.






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






19. 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






20. 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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21. 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.






22. The combination of the ribbon and magnet in a ribbon microphone.






23. The first microphone sold by Shure; Military awarded Shure a contract to build microphones in WWII.






24. The first dynamic microphone with changeable polar patterns.






25. A stereo miking technique similar to coincident pair - where the mics are set up with some distance between them; Distance and angle of microphones may differ; Creates a more defined stereo image; Produces very sharp images; Provides more 'air'.






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






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






28. The arm of the mic stand; Includes the angle adjust & telescopic adjust.






29. Omnidirectional: 0 - Cardioid: 8 - Supercardioid: 12 dB - Hypercardioid: 6 dB - Bidirectional: 0






30. The first cardioid pattern dynamic microphone.






31. 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






32. Mics in which sound waves vibrate a piezoelectric crystal that generates a varying voltage.






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






34. 2 - 4 ft. from player; Placed below the line of sight of the bell - rotated at about 30 degrees off axis - and tilted upward.






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






36. Small microphone attached to the bridge of a string bass or to an acoustic guitar to amplify its sound.






37. 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.






38. Sounds that arrive from angles other than the 0






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






40. Sensitive in a slightly narrower pattern in the front than cardioid and has a small lobe at rear; Rejects most signals arriving from 125






41. Older ribbon microphone weighing 8.5 lbs. nearly all of it the large magnet!






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






43. 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.






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






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






46. 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.






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






48. French physicist who pioneered piezoelectricity.






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






50. Rotating speaker cabinet design featuring separate treble and bass drivers that can switch speeds; Speaker rotate from front to back creating a Doppler effect; Resulted in new spatial perception for each note. Stereo miked up top and single miked at