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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. Condenser; Cardioid; End Address; Manufactured by Shure; Small condenser design that is great for instrument recording.






2. The outer covering of a microphone.






3. Determined by: Ribbon Thickness (about 3 to 6 microns); Corrugations/Inch; Tension of the Ribbon.






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






5. Utilized primarily on condenser and ribbon mics to isolate it from vibrations that might otherwise be transmitted to the microphone through the mic stand.






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






7. Raises the body of the microphone increasing height.






8. 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.






9. 12V DC; 24V DC; 48V DC






10. 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






11. The first dynamic microphone with changeable polar patterns.






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






13. 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.






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. Keep in proper case; Never disassemble shockmounts






16. Term coined by Sir Charles Wheatstone derived from the Greek words 'micro' (small) & 'phon' (sound).






17. Characterized by a vacuum tube transducer; Heat rises so many are hung upside down to prevent heat from reaching the microphone head; Avoid jostling or shaking these fragile mics.






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






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






21. 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.






22. French physicist who pioneered piezoelectricity.






23. Big + & + (More front with less positive rear)






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






25. Dynamic; Cardioid; End Address; Manufactured by Shure; Considered the industry standard for live vocal performance microphones; One of the best- selling microphones in the world.






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






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






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






29. Sounds that arrive at the 0






30. 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






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






32. Pair of omni mic elements mounted on opposite sides of a spherical shaped capsule.






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






34. 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.






35. Responds to air pressure variations outside of the capsule; Not selective of direction; Natural polar pattern is omnidirectional.






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






37. An electromagnetic microphone - in which a thin - corrugated ribbon is suspended within a high magnetic flux field; Excellent transient response due to the small amount of acoustic energy required to move diaphragm.






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






39. Increasing magnetic field strength is the only practical means of increasing output voltage; Conductor movement is limited due to tension of the ribbon; and ribbon length increases lead to a loss of high frequency response.






40. Shure's newer ribbon studio mics; KSM 353 & 313 (Roswellite); KSM 44 - 32 - & 27.






41. 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.






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






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






44. The measure of how quickly a mic's diaphragm will react when it is hit by an acoustic sound wave.






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






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






47. An electrical device characterized by its capacity to store an electric charge;






48. 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.






49. Shows the level of self- noise from a microphone's internal electronics; Measured in dB (decibels).






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







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