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WHAT IS DB AND HOW IT RELATES TO AMPLITUDE?

April 26, 2017Amplitude DB

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WHAT IS DB AND HOW IT RELATES TO AMPLITUDE?

1 Answer

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10 Posted

dB (decibel) is a logarithmic scale for signal level/power. Thus decibel never can give an absolute value of the amplitude, only the amplitude value in relation to some other level. E.g. we can say that one signal is 20dB lower or higher than another, but we cannot say that a signal is 20dB loud. Decibel scale is always relative. The relation between dB and amplitude is simple: dB1-dB2=20 Log10(A1/A2) That is if A1=2*A2 then dB1-dB2=20 Log10(2)=(approx) 6dB That is a signal having twice as large amplitude is about 6dB louder In SynC Modular you can use dB2AF macro to convert dB offset to amplitude factor. E.g.