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Intro to Recording > Intro to recording > Flashcards

Intro to recording Flashcards

1
Q

error protectiong and interleaving

A

does some math so you can detect a error later then mixes it up

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1
Q

Gain reduction

A

how much db is lost after compression

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2
Q

dither

A

high fq added to make sure the analong signal covers at least 2 quantization levels

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3
Q

Threshold of pain

A

10,000,000,000,000

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3
Q

error deduction and correction

A

uncrambles the data on disk

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3
Q

How did you use tape delay

A

the time it takes the tape to go from the record head to the playback head creates delay

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3
Q

low cut

A

removes low fq

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5
Q

Pure tone/sine wave

A

A sound that consist of a single basic frequency

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6
Q

what is the Robinson and Dadson curves

A

Equal loudness contours

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6
Q

why put a speaker in an enclosure

A

It capture the rear rendering energy

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6
Q

What is the anti alias filter?

A

An high cut smoothing filter

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7
Q

Octaves

A

Double of frequency

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8
Q

wavelength

A

speed of sound DIVIDED BY frequency

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9
Q

Pressure gradient

A
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9
Q

Whats an alias fq

A

getting a fq in the out put that was never at the input

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10
Q

Limiter

A

sets a ceiling, 20:1

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11
Q

Digital audio

A

Computer based encoding and decoding of a waveform

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12
Q

Pitch

A

Lowest to highest (relations of frequency)

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13
Q

high cut

A

removes high fq

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14
Q

Amount of availible numbers for a 16 bit CD

A

65536

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15
Q

the 4 ways to make reverb

A
  1. Chamber (in a room)
  2. Spring
  3. Plate
  4. Digital
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16
Q

20 Hz to 20k

A

What a human ear can hear

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16
Q

Heads

A

send in a voltage you change the magnetic field

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17
Q

Cardioid

A
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18
Q

Flutter

A

fast variations in tape speeds

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19
Q

Tape speeds (15-30 ips)

A

pushing the fq high enough to push gap loss

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19
Q

sample

A

instantaneous snapshot of amplitude

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20
Q

Q

A

when you choose a ratio, q will make the adjustment to fit it. no matter where the center fq is

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21
Q

Dynamic microphones

A

Creates a voltage by the moving of a conductor in a magnetic feild

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22
Q

What will happen if a barrier is larger then half of the wavelength?

A

It will reflect it

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22
Q

sample and hold

A

sampling a point on a signal, then waiting a little before sampling another point.

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23
Q

Reverbs

A

reflections so close that it makes a wash of sound

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24
Q

Proximity effect

A

Pressure gradient design
More low fq output the closer it is to the sound source

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25
Q

Passive radiator

A

Max the use of the rear radiating energy (pressure inside the speakerbox)

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25
Q

quantization error

A

theres an finite amount of analog signals and a certian amount of available numbers, so they estimate

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26
Q

Ports/vents

A

A opening that utilize the rear radiating energy

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27
Q

RT60 reverb time

A

how long it take to decay 60db

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29
Q

Pressure design

A
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29
Q

Cross talk

A

Adjacent tracks on the tape magnetize against each other

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31
Q

Bi-directional

A

Pick up in the front at back
2 direction

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32
Q

Reverse Polarity

A

Tuning the positive negative and the negative positive

35
Q

Why do we use decibel

A

The range of human hearing is enormous

the human perception of loudness is exponential

36
Q

Digital Audio advantages

A
  • Using Comupters to edit music
  • farther dynamic range
  • can take alot of damage and still can get your data back
  • faint cross talk and print through
  • no wow and flutter
36
Q

Expander

A

an varible amplifier where any signal below an set threshold would get quieter

37
Q

Complex tones

A

Made of more then one frequency

39
Q

Tape

A

what is made of (storing a magnetic field that changes in a way that an analgist to the wave the air pressure change)

A bunch of finely crushed magnet on plastic /the formulation of the crushed magnets can vary

41
Q

what is the result of the balance of the harmonics

A

Timbre

42
Q

Condenser/capacitor

A

o Something that can store a charge

o steady voltage goes in and varying voltage goes out by the way the diaphragm is move

phantom power goes to the external pre amp and store a charge

43
Q

Point source

A

Omni directional theoretical sound source

43
Q

Head order

A

Erase
Record
Playback/reproduce

45
Q

Tape hiss

A

White noise

46
Q

whats is quantization

A

the process of assigning analog signals to the nearing avalible number, the quantization levels

47
Q

Hard knee

A

instantly gets compressed after passing the threshold

48
Q

Attack time

A

how long a compression begins once a signal past the threshold

49
Q

disavantage

A
  • Musicians play worse
  • lower level signals gets distorted
51
Q

decibel

A

10Log Pm/Pr (powered measured/ reference power)

52
Q

Transducers

A

Changes a kind of energy to another kind of energy

52
Q

Twice as loud is

A

10 times the power

53
Q

Effect of room surfaces

A

(doubling of energy) 3db more in your direction by each barriers
2 walls and a floor will get you 9db and it will sound twice as loud
a lot of low fq. When a speaker is put in a corner

53
Q

4 parts of reverb

A
  1. Inital sound
  2. Early reflections
  3. onset of reverb
  4. decay
54
Q

Tape saturation (tape compression)

A

All the magnetic are used up and the tape is saturation and distorts
Sounds cool on a lot of things (especially from rock music)

55
Q

Pumping and breathing

A

audible hearing compressing going in and out

56
Q

Why do we use dynamic processers

A
  • To make something sit better in a mix
  • Protecton
  • Reduce dynamic range
  • effect or manipulate dynamic range
  • dynamic range in music would be larger then the dynamic range of the storag media
57
Q

digital to analog convertor

A

takes a voltage and turn it into a corresponding number

59
Q

Timbre

A

The characteristic sound of anything

60
Q

Parametric EQ

A

continuous control on the center, boost/cut, and Q

61
Q

Analog

A

The wave form that we store is analogist to the wave from in the air

62
Q

Reverse order of digital Audio

A
  • Error detection and correction
  • demultiplexer
  • digital to analog converter
  • sample and hold
  • anti alias filter
  • dither generator
64
Q

Bias

A

Very high fq (15000 hz) that we add into all analog recording to fixed zero cross distortion

65
Q

On axis

A

Where you get the best sound

67
Q

Unity gain

A

not boosting or cutting the signal

68
Q

Pink noise

A

Equal energy per OCTIVE

70
Q

What important colcusion might an enginner draw from the Robinson and Dadson Curves

A
  • You should always mix low
  • perception varies on how loud the music is
71
Q

equlization

A

fq dependent control of amplitude

73
Q

Twice the power is

A

3db

74
Q

What do a microphone polar pattern show

A

where sound is picked up at and where it rejects

76
Q

Omni

A

Equal sensitive in all directions
Pressure design (draw it)
Sound can only get to one side of the diagram

77
Q

Band width

A

The range of fq the will be effectied from being around the center fq

78
Q

Multiplexor

A

Turn 16 bit parallel info into 16 bit cereal info

79
Q

Print through

A

When one winding of tape magnetize its adjacent winding of tape

80
Q

Compressors

A

A varible gain amplifer where, above the set threshold, output would gain less as input increases

81
Q

Graphic equalizer

A

Graphically shows you what you’re doing to the fq responce

82
Q

analog to digital convertor

A

take a number and turn it into a corresponding voltage

83
Q

Dynamic range

A

The quiet sound something can produce to the loudest sound with a little distortion

85
Q

Frequency

A

Cycles per second

86
Q

White Noise

A

Equal energy per FREQUENCY

87
Q

Order for Digital Audio

A
  • Dither generater
  • Anti alias filter
  • Sample and hold
  • Analog to digital converter
  • Multiplexor
  • Error protection and interleaving
88
Q

Wow

A

slow variations in tape speeds

89
Q

Gap loss

A

When a fq is high enough (making the wave form shorter) it can fit in the gap and playback see no different and play

89
Q

shelving filters

A

boost/cut all fq at the same time

90
Q

What do you need for sound? 2 Things

A

Motion and medium

92
Q

soft knee

A

eased into compression after passing the threshold

93
Q

side chain

A

one sound controlling another sound

94
Q

Release time

A

The time it take a signal to go to unity gain after dropping under the treshold

95
Q

What is the symbol of Reverse polarity

A

A circle with a line through it

96
Q

Zero cross distortion

A

Anything near zero become zero
Fixed by sending a very high fq tone

97
Q

Threshold of hearing

A

the quietest sound a healthy person could hear

98
Q

Delay

A

Refections you can hear individually

99
Q

wavelength size

A

About 1100 feet per second

100
Q

2 to 1 rules

A

nyqust found it

when your sample fq is twice the highes fq you record, nothing will happen

breaking this rule will result in making alias fq

Intro to Recording (1 decks)

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