Test 2

Question 1

Capacitance Mic Features

Answer 1

Most sensitive, requires power supply, very common, most expensive

Question 2

Moving Coil Mic Features

Answer 2

most reliable, low noise, low distortion, inexpensive

-rugged

Question 3

Ribbon Mic Features

Answer 3

Most fragile, easy to distort, least common, more sensitive than moving coil mic

Question 4

What is a microphone?

Answer 4

electro-acoustic device that converts acoustical energy into electrical energy (transducer)

Question 5

Capacitance mic first developed:

Answer 5

in 1916 by E.C. Wente

Question 6

Build of capacitance mic

Answer 6

two thin plates (one moveable/one fixed) w/ charge applied

Question 7

Moving coil mic first developed:

Answer 7

in 1928 by E.C. Wente

Question 8

Build of moving coil mic

Answer 8

small diaphragm and voice coil moving in magnetic field. Sound waves cause diaphragm o move in the magnetic field, generating a voltage proportional to sound pressure

Question 9

Ribbon mic first developed:

Answer 9

introduced by RCA in 1932 designed by Harry Olsen

Question 10

Build of Ribbon mic

Answer 10

thin ribbon suspended in magnetic field. Sound pressure between front & back cause it to move w/ current flow proportional to acoustic waveform

Question 11

(moving coil, ribbon) *All dynamic mics contain:

Answer 11

magnets

Question 12

Polar Pattern:

Answer 12

graph of sensitivity w/ respect to direction and frequency

Question 13

omnidirectional

Answer 13

picks up sound equally in all directions

Question 14

bi-directional

Answer 14

picks up sound equally from two opposite directions

Question 15

uni-directional

Answer 15

picks up sound primarily in one direction

Question 16

Multi-Directional microphone

Answer 16

miss that are capable of switching from one pick-up pattern to another

Question 17

Sound a mic receives is dependent on 3 external variables:

Answer 17

1) The nature of the sound source
2) The acoustic environment
3) *The placement of the mic

Question 18

Close micing

Answer 18

(< 3ft from source) aids sound isolation, minimizes acoustics, little phase cancellation

Question 19

Distant micing

Answer 19

(> 3ft from source) natural blend in acoustical space, room tone of ambience, high probability of phase cancellation

Question 20

Mic placing technique 3:1 rule

Answer 20

• each mic at least 3x farther apart than each is from its source
• reduces phase cancellation

Question 21

Stereo micing

Answer 21

• 2 identical mics

- 3-30ft apart

Question 22

Coincident (X/Y)

Answer 22

• 2 identical mics

- capsules aligned; angle of 90-135 degrees

Question 23

mid-side

Answer 23

• 2 complimentary mics

- 1 directional; 1 bi-directional

Question 24

(Mic Characteristics) Transient response:

Answer 24

how quickly a mics diaphragm will react to acoustic wave