Some Conversions to Memorize
The formula for converting from dB to ratios just divides the dB value by ten and then takes the antilog
You don't need to memorize the formula, but you should memorize the fact that in the dB system,
• 0dB represents a ratio of 1 to 1 (100 to 1)
• 10 dB represents a ratio of 10 to 1 (101 to 1)
• 20 dB represents a ratio of 100 to 1 (102 to 1)
• 30 dB represents a ratio of 1,000 to 1 (103 to 1)
You also need to memorize the following two factors as well
3 dB in the decibel system is approximately the same as a ratio of 2 to 1.
5 dB is approximatley the same as a ratio of 3 to 1
Using combinations of these memorized values we can approximate all other dB conversions.
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