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






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






4. Raises the body of the microphone increasing height.






5. Dynamic; Cardioid; End Address; Manufactured by Electro Voice; Large Diaphragm; Humbucking Coil; Bass Roll Off Switch; Minimizes proximity effect; Ideal for broadcasting and sound engineering techniques.






6. Omnidirectional: 360






7. To capture two perspectives on the same sound.






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






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






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






11. 4800 ft/sec






12. A stereo miking technique similar to coincident pair - where the mics are set up with some distance between them; Distance and angle of microphones may differ; Creates a more defined stereo image; Produces very sharp images; Provides more 'air'.






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






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






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






16. Barrier made of shaped wire covered with a piece of nylon that is placed between a sensitive mic and the talent to avoid damage to the diaphragm of the mic.






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






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






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






20. 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).






21. The first cardioid pattern dynamic microphone.






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






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






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






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






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






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






28. 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.






29. A gradual - continuous decrease in low frequency response.






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






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






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






33. 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.






34. Solid state version of the U67.






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






36. DC Voltage Req'd for capsule polarizing voltage and internal mic preamps; 3 sources: External Power Supply Unit (PSU); Phantom Power; Battery.






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






38. Coincident stereo miking techniques that has two microphone diaphragms occupying (as near as possible) the same space; Capsules often on top of each other; Not good for noisy locations.






39. The combination of the ribbon and magnet in a ribbon microphone.






40. 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.






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






42. Radio Frequency Interference






43. 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.






44. Microphone consisting of two parallel metal plates - each holding an opposing charge (+ or -) and thus creating a capacitor to induce an electrical charge as sound waves move the diaphragm; Require a solid- state or tube preamplifier.






45. 12V DC; 24V DC; 48V DC






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






47. 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.






48. Rotating speaker cabinet design featuring separate treble and bass drivers that can switch speeds; Speaker rotate from front to back creating a Doppler effect; Resulted in new spatial perception for each note. Stereo miked up top and single miked at






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






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







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