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SEW Day 6 - dB Flashcards

(10 cards)

1
Q
A

Describe decibels
Explain the benefits of decibels
Summarize decibels rules of thumb
Perform basic decibel conversions

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2
Q

A decibel (dB)

A
  • a logarithmic unit used to measure signals and communication
  • Makes large and small numbers more manageable
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3
Q

The dB is a logarithmic unit of ___ named for Alexander Graham Bell

A

The Bel is a logarithmic unit of intensity named for Alexander Graham Bell

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4
Q

decibel = ____ of a Bel

A

one-tenth

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5
Q

turns exponential changes into linear changes

A

Logarithmic Scaling

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6
Q
  • Linear scales increment by a constant: ___
  • Logarithmic scales increase by a factor of the base: ___
A
  • 1, 2, 3, 4, etc.
  • 1, 10, 100, 1000, etc.
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7
Q
  • express a ratio relative to a reference value on a logarithmic scale
  • are unitless ratios representing increases or decreases in values
A

Decibels (dB)

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8
Q

dB Suffix: dBW or dBm
Reference Value:
Unit

A

1W and watts
1mW and milliwatt

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9
Q

dB Rules of Tens

A

For every 10 dB increase, the signal strength (linear value) is multiplied by 10

For every 10 dB decrease, the signal strength (linear value) is divided by 10

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10
Q
A
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