Test your basic knowledge |

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. Fixed plate that is charged with polarized voltage found in condenser mics; Usually constructed of milled brass; Has a number of holes drilled in it to provide damping for diaphragm.






2. 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.






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






4. Divisions on the fingerboard which represent the position of a specific note or tone.






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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


8. The first cardioid pattern dynamic microphone.






9. 12V DC; 24V DC; 48V DC






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






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






12. 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






13. Condenser; Multiple; Side Address; 48V Required; Manufactured by AKG; Dual Diaphragm; Nine selectable pickup patterns; Peak Hold LED; The reference microphone for almost all comparative microphone tests.






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






15. Tough & rugged; Can work in extremely high SPL environments; Less responsive to transient frequencies b/c of diaphragm mass is heavier than sound waves.






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






17. 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






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






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






20. First microphone invented by Georg Neumann






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






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






23. EMI employee that was the innovator of many coincident pairing mic techniques; Mid/Side & Blumlein techniques are associated with him.






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






25. 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.






26. Device used to measure sound loudness; Often used to measure and balance the loudness of each speaker in a home - studio - or live venue or theater system.






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






28. 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.






29. Small Diaphragm Electret condensers; Extremely flat frequency response; Omnidirectional pattern.






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






31. 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






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






33. Omnidirectional: N/ - Cardioid: 180






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






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






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






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






38. Forward facing bipolar mics spaced 20cm apart.






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






41. Tube microphone capable of SPL's over 140dB.






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






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






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






45. This is what is measured to produce an electrical signal in condenser mics; This changes as sound waves strike the diaphragm causing the distance to the back plate to change.






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






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






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






49. 4800 ft/sec






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