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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.
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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. 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






2. 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.






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






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






5. 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.






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






7. Occupying the same space and time.






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






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






10. The first cardioid pattern dynamic microphone.






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






12. Forward facing bipolar mics spaced 20cm apart.






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






14. 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.






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






16. 2 - 4 ft. from player; Placed below the line of sight of the bell - rotated at about 30 degrees off axis - and tilted upward.






17. 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.






18. 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






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






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






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






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






23. French physicist who pioneered piezoelectricity.






24. 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.






25. Modern drummer who has created a large kit and innovated several ways of capturing the sound from his massive kit.






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






27. 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.






28. Sounds that arrive from angles other than the 0






29. 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.






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






31. Magnetic field opposite to that which presently exists; Do this on the bottom mic when miking a snare with two mics.






32. The outer covering of a microphone.






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






34. Used for stereo miking to ensure correct balance and imaging.






35. Condenser; Cardioid; Side Address; 48V Required; Manufactured by AudioTechnica; Ideal for project/home- studio applications; Low price; Remains the low cost performance standard in side- address condenser mics.






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






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






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






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






40. The world's first single element cardioid mics.






41. First microphone invented by Georg Neumann






42. Solid State and Tube.






43. Radio Frequency Interference






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






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






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






47. The method by which microphones are classified.






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






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






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







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