Chapter 4 Flashcards
(29 cards)
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)
What does a transducer do?
Convert energy from one form to another form
Electromagnetic induction
“Moving coil”
forcing a current to flow
Wire attached to diaphragm that moves past a magnet
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
What is frequency response?
How well a mic picks up certain frequencies or which frequencies/ harmonics are emphasized
Individual voice of a mic
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
What is transient response?
How quickly a mic respond to a sound Dynamics = slow Condensers/ Ribbons = fast Large diaphragm = slow Small diaphragm = fast
What is directional response?
How well a mic picks up sound from different directions
What is polar patterns?
Graph showing directional response
Omnidirectional
Figure 8
Cardioid
Omnidirectional
Picks up sound equally from all directions
Cardioid
Full response on axis 0*
Null at 180*
Partial on sides
Figure 8
Bi directional
Full response on axis 0*
Full response at 180* but put of phase
Null on sides ( mostly ribbons)
What is sensitivity?
Amount of output a mic will give for a specific input
Tells how application is needed to reach line level (+4dBV)
Equivalent noise/self noise
Static, Hum, Noise generated by mic itself
What is a pad?
Circuit that reduces the level of a signal
Which increase the dynamic range
Prevent from overloading
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
What happens when you close mic something?
It is clear, present sound, little to no room noise, punchy, in your face
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
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)
What is spaced pair?
2 mics
Omnidirectional/Cardioid
Pointed directly at source
Lots of phasing but wide stereo image
What is near-coincidental?
2 mics
Both are cardioid
Capsules angled away from each other centered on source
What are some near-coincidental techniques?
ORTF
NOS
What is ORTF?
2 cardioid mics
Capsules pointed away from each other
17cm apart at 110*
What is NOS?
2 cardioid mics
Capsules pointed away from each other
30cm apart at 90*
