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






2. + & + (Front & rear in equal positive amounts)






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






4. 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






5. Shure's ribbon microphone that utilizes Roswellite to prevent ribbon damage.






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






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






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






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






10. Mid-Section of the mic stand; Includes the clutch.






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






12. Mic in which the diaphragm moves in response to sound waves and an attached pin/rod moves; Coil attached to pin/rod moves alone with the diaphragm.






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






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






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






16. An instrument for detecting sound transmitted through water commonly manufactured using ceramic piezoelectric material.






17. Sounds that arrive from angles other than the 0






18. 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.






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






20. 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.






21. 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






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






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






24. First to mass produce the condenser microphone in 1929; Improved cutting lathe technology by developing direct drive turntables; Invents 48V Phantom Power to power the new condenser microphone for Norwegian State Television.






25. 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.






26. French broadcasting stereo mic technique; An X-Y type with the mics 17cm apart and at a 110






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






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






29. To oppose with equal weight or force as in the length of the boom arm versus the weight of the microphone.






30. 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






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






32. 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.






33. Overall measurement close to the overall sound level in frequency response charts.






34. 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.






35. Tube with ports down the side with the mic capsule at the bottom; Sounds entering the tube from on - axis interact inside the tube with the sounds coming in through the side ports - an interfere with each other in such a way as to partially cancel of






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






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






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






39. Big + & - (More front with less opposite rear)






40. Omnidirectional: 360






41. 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.






42. 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).






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






45. Dynamic; Cardioid; End Address; Manufactured by Sennheiser; Unique mic clip with quick- release button; Large diaphragm dynamic element handles high SPL's - making it great for recording guitars and drums.






46. 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.






47. 4 coincident mics each positioned at 90






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






49. Allows all low frequencies to pass; Blocks the higher frequencies from being processed.






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







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