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
2
Q
A decibel (dB)
A
- a logarithmic unit used to measure signals and communication
- Makes large and small numbers more manageable
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
4
Q
decibel = ____ of a Bel
A
one-tenth
5
Q
turns exponential changes into linear changes
A
Logarithmic Scaling
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.
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)
8
Q
dB Suffix: dBW or dBm
Reference Value:
Unit
A
1W and watts
1mW and milliwatt
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
10
Q
A
