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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. Cable wrapping method that reduces interference and makes it easier to unravel the cable.






2. The arm of the mic stand; Includes the angle adjust & telescopic adjust.






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






4. 12V DC; 24V DC; 48V DC






5. Sounds that arrive at the 0






6. 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.






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






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






9. 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.






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






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






12. Forward facing bipolar mics spaced 20cm apart.






13. Pair of cardioids facing to the front and rear - plus a sideways - facing figure 8; Mid- sides pair plus another rear- facing cardioid which is combined with the same Figure 8 mic for the surrounds.






14. To capture two perspectives on the same sound.






15. Device used to calibrate sound pressure measurement devices; Emits a single 1 kHz frequency over a sustained period of time.






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






17. 1 Bidirectional & 1 Cardioid placed coincidentally; Bidirectional faces left and right and cardioid faces the sound; Gives control of the focus and size of the stereo image;






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






19. 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.






20. Changes in air pressure from the front or the back can cause polarity cancellation; Sides have good rejection; Natural polar pattern is bidirectional.






21. Reduces the power of a signal used when the trim itself cannot prevent overload in the mic line level signal.






22. 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






23. 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






24. Solid state version of the U67.






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






26. 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.






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






28. 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.






29. Another name for condenser microphone.






30. 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.






31. Built by AKG for Telefunken and regarded as one of the best vintage condenser microphones ever.






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






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






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






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






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






37. Demonstrated the first stereophonic transmissions via the Theatrophone in 1881.






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






39. Sounds that arrive from angles other than the 0






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






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






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






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






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






45. Extremely narrow area of sensitivity in front with extended reach; Also has multiple lobes which vary in position with frequency; Not made from combining pure patterns - but created by using an interference tube.






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






47. 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






48. 4800 ft/sec






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






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







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