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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. Basket/grille made out of a specific type of copper wire to block protect the mic from physical damage and to protect the mic from stray RFI






2. The first AKG dynamic microphone.






3. French physicist who pioneered piezoelectricity.






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






5. 2 - 4 ft. from player; Placed below the line of sight of the bell - rotated at about 30 degrees off axis - and tilted upward.






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






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






8. 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.






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






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






11. To capture two perspectives on the same sound.






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






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






14. 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






15. Will yield a 6dB increase in output - but will cause a loss of high frequency response.






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






17. 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.






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






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






20. Best signal- to- noise ratio; Minimal phase cancellation; Quality representation of what is being recorded; Attempt to ignore unwanted external noise.






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






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






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






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






25. 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.






26. 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.






27. Shows the total range of the mic's internal pre- amp; Measured in dB (decibels).






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






29. 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.






30. 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.






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






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






33. 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.






34. Founded AKG at the end of WWII in Austria.






35. 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.






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






38. Commonly utilize large diaphragm dynamic mics.






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






40. 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.






41. Three or more microphones working together to capture a stereo or surround image of the sound source.






42. 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






43. The first phantom powered condenser microphone designed for use by Georg Neumann for Norwegian State Television.






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






45. Moving a conductor (a coil of wire) through a magnetic field will cause a voltage to be induced across the conductor.


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






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






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






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






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






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