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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. 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.






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






3. 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.






4. Delicate and require extreme care; NO PHANTOM POWER; Becoming more popular than ever because of highly efficient magnets - lower manufacturing costs - and great fidelity.






5. Tough & rugged microphone that contains an element consisting of a dome- shaped diaphragm and a moving 'voice coil'; Operates on principles of magnetic induction.






6. 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.






7. 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






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






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






10. 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.






11. Modeled to mimic a human head for extremely good spatialization; Shaped like a human head.






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






13. Electro- acoustic device attached to a transducer that vibrates to receive or produce sound waves which put the device into motion.






14. 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.






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






16. 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.






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






18. The measuring device used for loudspeaker room response testing.






19. 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.






20. 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.






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






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






23. Raises the body of the microphone increasing height.






24. 4 coincident mics each positioned at 90






25. + (only); (Front capsule alone)






26. 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'.






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






28. German broadcasting stereo mic technique; An X-Y type with the mics 20cm apart and at a 90






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






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






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






32. Solid State and Tube.






33. 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.






34. Use coincident or near coincident pairings; Too many microphones will cause phasing issues.






35. 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.






36. When using two microphones reverse the polarity of the bottom mic.






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






38. Angle of maximum signal rejection in a microphone polar pattern.






39. 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.






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






41. 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.






42. Omnidirectional: 0 - Cardioid: 8 - Supercardioid: 12 dB - Hypercardioid: 6 dB - Bidirectional: 0






43. The tuning machines of a guitar; Part of the tuning key that strings are threaded through and twisted.






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






45. Proportional to: Magnetic field strength; Length of the conductor; Velocity of conductor moving through the magnetic field.






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






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






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






49. Often look like handheld vocal mics; Talk or sing into the end of the microphone.






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







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