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Flashcards in Chapter 4 Deck (29)
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0

What does a transducer do?

Convert energy from one form to another form

1

What is phantom power?

Adds power to condenser mic circuits
Create static charge 48V
Power on board electronics
(Hi-pass, pad, polar pattern, pre amp)

2

Electromagnetic induction

"Moving coil"
forcing a current to flow
Wire attached to diaphragm that moves past a magnet

3

Electrostatic induction

Thin diaphragm use a static charge
suspended over to create current
Charged plate, creates a capacitor
As diaphragm move, voltage goes up and down creating audio signal

4

What is frequency response?

How well a mic picks up certain frequencies or which frequencies/ harmonics are emphasized
Individual voice of a mic

5

What is proximity effect and when does it take effect?

Low frequencies response increase
When you are to close to the mic
Sounds like Barry White

6

What is transient response?

How quickly a mic respond to a sound
Dynamics = slow
Condensers/ Ribbons = fast
Large diaphragm = slow
Small diaphragm = fast

7

What is directional response?

How well a mic picks up sound from different directions

8

What is polar patterns?

Graph showing directional response
Omnidirectional
Figure 8
Cardioid

9

Omnidirectional

Picks up sound equally from all directions

10

Cardioid

Full response on axis 0*
Null at 180*
Partial on sides

11

Figure 8

Bi directional
Full response on axis 0*
Full response at 180* but put of phase
Null on sides ( mostly ribbons)

12

What is sensitivity?

Amount of output a mic will give for a specific input
Tells how application is needed to reach line level (+4dBV)

13

Equivalent noise/self noise

Static, Hum, Noise generated by mic itself

14

What is a pad?

Circuit that reduces the level of a signal
Which increase the dynamic range
Prevent from overloading

15

What is a preamp?

Used to amplify a mic signal
Raises mic level (-60dB) to line level (+4dB)
Hi-pass filtering
Phase flip
Using pad circuits
Phantom power

16

What happens when you close mic something?

It is clear, present sound, little to no room noise, punchy, in your face

17

What happens when you mic something with distance?

It is more of a natural sound
Instruments and amp bleed of room making it sound more natural and filled

18

When doing stereo mic techniques?

2 miss
Exact same mic
Same gain level on both mice
Same placement ( distance to and from source)
(Height of mic stands, and distance to walls)

19

What is spaced pair?

2 mics
Omnidirectional/Cardioid
Pointed directly at source
Lots of phasing but wide stereo image

20

What is near-coincidental?

2 mics
Both are cardioid
Capsules angled away from each other centered on source

21

What are some near-coincidental techniques?

ORTF
NOS

22

What is ORTF?

2 cardioid mics
Capsules pointed away from each other
17cm apart at 110*

23

What is NOS?

2 cardioid mics
Capsules pointed away from each other
30cm apart at 90*

24

What is coincidental techniques?

Capsules are touching
No phasing
Use intensity difference to create stereo image

25

What are some coincidental techniques?

X/Y
Mid/Side (M/S)
Blumlein

26

What is X/Y?

2 cardioid mics
Capsules touching at 90*

27

What is mid/side?

1 cardioid mic (mid)
1 figure 8 (side)
Mid point at the source
Side is pointed 90* to the source

28

What is blumlein?

2 figure 8 mics
Set at 90* to each other
45* to the source