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






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






3. Another name for condenser microphone.






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






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






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






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






9. Coincident pairing angled between 90






10. + & - (Front & rear in opposite equal amounts)






11. 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.






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






13. Sounds that arrive from angles other than the 0






14. A flat or roughly flat strip on the neck of a stringed instrument against which the strings are pressed to shorten the vibrating length and produce notes of higher pitches.






15. Condenser; Cardioid; End Address; 48V Required; Manufactured by Neumann; Consists of three compact miniature microphones; Has a gentle rise at about 9 kHz that provides tonal balance that is fresher and livelier.






16. Polar pattern produced when you add a little bit of bidirectional to the omni pattern.






17. Digital device used to Fourier Forms; Used to measure the specific number of sine waves in a specific frequency in a specific setting.






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






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






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






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






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






23. Method of creating low end effects from a bass drum by creating a tunnel at the mic end thus trapping sound and amplifying low end boost.






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






26. The first cardioid pattern dynamic microphone.






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






28. Condenser; Cardioid; End Address; 48V Required; Manufactured by AudioTechnica; Switchable 80 Hz Hi-Pass Filter; Ideal for professional recording and critical applications in broadcast.






29. 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






30. Cable wrapping method that keeps every coil on top of the next; May cause interference and tiny curls or tangles.






31. - Omnidirectional: 100% - Cardioid: 33% - Supercardioid: 27% - Hypercardioid: 25% - Bidirectional: 33%






32. Filters only the bandwidth of frequencies that are supposed to (or allowed) to pass through; High and Low Pass are examples.






33. Condenser; Cardioid; Side Address; 48V Required; Large Diaphragm; Manufactured by Rode; Widely recognised as the world's quietest studio microphone; Ideal for vocals - voiceover - and acoustic instruments.






34. 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.






35. Omnidirectional: 360






36. Allow sound to reach the rear of the capsule/diaphragm - to create cardioid - supercardioid - and hypercardioid patterns In single capsule pressure gradient microphones.






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






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






39. Raises the body of the microphone increasing height.






40. Keep in proper case; Never disassemble shockmounts






41. Allows all high frequencies to pass; Blocks the lower frequencies from being processed.






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






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






44. 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.






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






46. Solid State and Tube.






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






48. 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






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






50. Divisions on the fingerboard which represent the position of a specific note or tone.