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MRAT 6040 - Digital Audio Studio Seminar > Decibels > Flashcards

Decibels Flashcards

1
Q

What is the equation for finding watts?

A

dB=10log(P2/P1)

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2
Q

What is the equation for finding volts?

A

dB=20log(V2/V1)

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3
Q

What is the equation for finding sound pressure?

A

dB=20log(Pa2/Pa1)

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4
Q

How many dB is twice the voltage (volts)?

A

6dB

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5
Q

How many dB is half the voltage (volts)?

A

-6dB

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6
Q

In a dB equation, which part is the linear amount?

A

the ratio (ex. P2/P1, V2/V1, etc.)

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7
Q

What is the dB reference for 0dBW?

A

1 Watt

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8
Q

What is the dB reference for 0dBm?

A

.001 Watt (1 milliwatt)

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9
Q

What is the dB reference for 0dBV?

A

1 volt

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10
Q

What is the dB reference for 0dBu?

A

.775 Volts

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11
Q

What is the dB reference for 0dBμ?

A

.000001 Volts (1 microvolt)

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12
Q

What is the dB reference for 0dBSPL?

A

.00002 Pascals

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13
Q

How many dB is twice the power (watts)?

A

3dB

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14
Q

How many dB is half the power (watts)

A

-3dB

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15
Q

How many dB is near the just noticeable difference (JND)?

A

3dB

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16
Q

How many dB is 10x power?

A

10dB

17
Q

What does 10x power sound like to the average listener?

A

twice as loud

18
Q

What are the five types of dB problems you will encounter?

A
  • expressing 2 measured linear values as dB
  • solving for a missing linear value
  • expressing V, power, or Pa as dB reference
  • converting dB reference to linear amounts
  • summing signals together (converting dB to linear amounts, then expressing V, power, or Pa as dB reference)
19
Q

What are the 3 steps for expressing 2 measured linear values as dB?

A
  • figure out what type of linear amount you will be using (volts, watts, or sound pressure)
  • use the appropriate equation (10log for watts, 20log for volts and Pa
  • solve for dB
20
Q

What are the steps for solving a missing linear value?

A
  • figure out what type of linear amount you will be using (volts, watts, or sound pressure)
  • use the appropriate equation (10log for watts, 20log for volts and Pa)
  • solve for output (ex. V2, P2, etc.)
21
Q

What are the steps for expressing V, power, or Pa as a dB reference?

A
  • use the equation dBref=(x)log(V/Vref) where V=measured amount compared to standard reference and x=either 10 or 20 depending on reference
  • solve for dBref
22
Q

What are the steps for converting dB references to linear amounts?

A
  • figure out what type of linear amount you will be using (volts, watts, or sound pressure)
  • use the equation dBref=(x)log(V/Vref) where V=measured amount compared to standard reference and x=either 10 or 20 depending on reference
  • solve for V
23
Q

What are the steps for summing signals?

A
  • convert dB->reference (V, watts, or Pa)
  • add together
  • show results in dB
24
Q

What is the equation for inverse square law?

A

NR=20log(D2/D1)

where NR=noise reduction, D2=second distance, and D1=first distance

MRAT 6040 - Digital Audio Studio Seminar (3 decks)

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