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High-Tech Channel Hitachi High-Tech GLOBAL

Measuring the complex sensitivity of the “ear”

Symbol: dB / Base data: sound. accepted non-SI units with prefixes.
Uses logarithms to express ratio corresponding to size of reference signal

Using a calculation method called logarithms

When sound pressure increases 10 times, the human ear feels that the sound volume has increased by 2 times. It is a relative indication method that uses a calculation method called “logarithms” to compare two sounds and see how many times they are different. A decibel is surprisingly complex.