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Test your basic knowledge |
Microphones Theory
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Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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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. An electrical device characterized by its capacity to store an electric charge;
Capacitor
Rear Sensitivity (Relative to Front)
Backplate
Decca Tree
2. Consumers can listen to live broadcasts over telephone lines; Individual one- way experience that required a subscription service to listen to performances.
Roswellite
Ribbon Microphone
Max SPL
Theatrophone
3. Often look like handheld vocal mics; Talk or sing into the end of the microphone.
Percussion Mic Placement
Telefunken ELA- M251
End Address
Dynamic Range
4. Allows all low frequencies to pass; Blocks the higher frequencies from being processed.
Lowpass Filter
Powering Condenser Microphones
Speed of Sound Underwater
Boom Placement Rule
5. Captures sounds arriving 90
Proximity Effect
Shure SM58
Neumann U47
Parabolic Systems
6. Mid-Section of the mic stand; Includes the clutch.
Neumann U67
Body
Shotgun
Angle of Max Rejection
7. Angle of maximum signal rejection in a microphone polar pattern.
Crystal & Ceramic Microphones
Clip
Null Angle
MSM
8. Moving a conductor (a coil of wire) through a magnetic field will cause a voltage to be induced across the conductor.
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9. The first AKG dynamic microphone.
OSHA Exposure Table
AKG DYN60
Neumann U47
Stereosonic
10. 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.
Interference Tube...
MSM
Increasing Output Voltage in Ribbon Mics
Baffle
11. Verify that the boom is placed over a microphone leg prior to use to provide added balance and stability.
Boom Placement Rule
AKG C1000S
Stereo Bar
Decca Tree
12. Close mic placement can help guard again bleed from other instruments and takes advantage of proximity effect; Center of cone = Brighter; Outside of cone = Darker; Reflections can create phase issues (can be reduced by putting the cabinet at an angle
Sealed Ni-Cad Battery
Guitar Amp Mic Placement
AKG C414
Hypercardioid
13. 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.
Ribbon Microphone Sensitivity
Wind Screens
Shure Unidyne Series
Electro Voice RE20
14. Older ribbon microphone weighing 8.5 lbs. nearly all of it the large magnet!
Parabolic Systems
RCA 44BX
Neumann U47
Tube Condenser Microphone
15. 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.
Shure SM58
Faraday Cage
3:1 Rule
Sennheiser MD421
16. Stereo coincident pairing where the middle mic (usually a cardiod) is facing source and a bidirectional side mic is placed at 90
LRFB
Electro Voice RE20
Mid/Side
Interference Tube...
17. Sounds that arrive at the 0
On -Axis
Ambient Sound Sensitivity
E.C. Wente
Fingerboard
18. More compelling sound - giving both depth and perspective.
Fingerboard
AKG C414
Legs
Stereo
19. One of the oldest mics; Diaphragm mounted on & compresses cup of tiny granules of carbon (100 microns big) that increase current flow when compressed by sound waves and vary electrical current; Also called Resistance Mics;
Goals of Sound Effects
Pickup
Carbon Microphone
Condenser Diaphragm
20. Used in production sound for multiple perspectives on the set; Used in Audio Post to record a number of mics into a recorder with minimal set- up & tear down.
End Address
Field Mixer
Faraday Cage
Spherical Mic
21. 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.
Coincident Pair
Spherical Mic
Transient Response
Diaphragm
22. The reduction in the amplitude of a wave due to the dissipation of wave energy.
Damping
Pop Filter
Tube Condenser Microphone
Shure KSM-353
23. Tough & rugged microphone that contains an element consisting of a dome- shaped diaphragm and a moving 'voice coil'; Operates on principles of magnetic induction.
Real Time Analyzer (RTA)
Sennheiser MD421
Dynamic Microphone
Fukada Tree
24. 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'.
Near Coincident Pair
Spaced Pairs
Ribbon Mic Characteristics
Sealed Ni-Cad Battery
25. Small microphone attached to the bridge of a string bass or to an acoustic guitar to amplify its sound.
Roll-Off
Model 3B Carbon Microphone
Pickup
Dynamic Mic Characteristics
26. Pair of omni mic elements mounted on opposite sides of a spherical shaped capsule.
Near Coincident Pair
Spherical Mic
Dynamic Microphone
Carbon Microphone
27. Very robust and durable; Used in telephones until 1990's; Currently finds applications for military use.
Carbon Microphone Uses
Pressure Gradient Capsules
Phase Ports
Pickup
28. Characterized by a vacuum tube transducer; Heat rises so many are hung upside down to prevent heat from reaching the microphone head; Avoid jostling or shaking these fragile mics.
Stereo Bar
Shure SM81
Tube Condenser Microphone
Legs
29. Early example of switchable polar patterns; Had both a dynamic and a ribbon capsule inside of it which when combined produced other polar patterns.
Capacitor Microphone
Measurement Mics
Theatrophone
Altec/Western Electric 639
30. Keep in proper case; Never disassemble shockmounts
Pressure Gradient Capsules
Electret Condenser
Microphone Storage
Parabolic Systems
31. Founded AKG at the end of WWII in Austria.
Spaced Pairs
Rudolf Goerike & Ernest Pless
Rear Sensitivity (Relative to Front)
Phasing
32. Will yield a 6dB increase in output - but will cause a loss of high frequency response.
Omnidirectional
Electret (Word Etymology)
Doubling Ribbon Length
Tuning Keys
33. 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.
Shure SM58
Rear Sensitivity (Relative to Front)
Off-Axis
AKG C414
34. Solid State and Tube.
Types of Pre-Amps for Condenser Mics
Shotgun
Damping
Faraday's Law of Magnetic Induction
35. 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.
Magnetic Microphone
Shure SM58
Clement Ader
Snare Drum Mic Placement
36. 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.
FFT Analyzer
Clutch
Field Mixer
Shiny Box 46MXL
37. Cable wrapping method that keeps every coil on top of the next; May cause interference and tiny curls or tangles.
Over/Over
Coverage Angle
Rear Sensitivity (Relative to Front)
Pressure Gradient Capsules
38. Sounds that arrive from angles other than the 0
Off-Axis
Harvey Fletcher
Lowpass Filter
Supercardioid
39. 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.
Neumann KM 184
Pressure Capsules
Shure KSM-353
Distance Factor
40. When using multiple microphones - the distance between microphones should be at least 3 times the distance from each microphone to its intended sound source.
Harvey Fletcher
Theatrophone
Motor
3:1 Rule
41. Allows all high frequencies to pass; Blocks the lower frequencies from being processed.
Noise
Distance Factor
End Address
Highpass Filter
42. Changes in air pressure from the front or the back can cause polarity cancellation; Sides have good rejection; Natural polar pattern is bidirectional.
Mono
Pickup
Pressure Gradient Capsules
Side Address
43. 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.
Decca Tree
Electro Voice RE20
Sennheiser MD441
AudioTechnica AT4040
44. German broadcasting stereo mic technique; An X-Y type with the mics 20cm apart and at a 90
DIN
Fingerboard
Wind Screens
Pop Filter
45. Use coincident or near coincident pairings; Too many microphones will cause phasing issues.
Doubling Ribbon Length
Shure SM81
Striking
Percussion Mic Placement
46. Mics in which sound waves vibrate a piezoelectric crystal that generates a varying voltage.
Crystal & Ceramic Microphones
FFT Analyzer
Boom Placement Rule
Vintage Tube Mic Precautions
47. Most sensitive to sounds arriving from the front while rejecting sounds from rear; Shaped like a heart; Rejects most signals from 180
Dynamic Mic Characteristics
Cardioid
Alan Blumlein
Trumpet Mic Placement
48. 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.
AKG C414
Leslie Cabinet
Nuvistor Tube
SPL Meter
49. Commonly found in acoustic guitar pickups; Ceramic piezoelectric material is used in hydrophones (underwater mics) because of durability.
Harvey Fletcher
Crystal and Ceramic Mic Use
Carbon Microphone Uses
Examples of Piezoelectric Material
50. Omnidirectional: 0 - Cardioid: 8 - Supercardioid: 12 dB - Hypercardioid: 6 dB - Bidirectional: 0
Condenser Diaphragm
Rear Sensitivity (Relative to Front)
Snare Drum Mic Placement
Crystal & Ceramic Microphones
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