On the decibel scale, 0 dB is the smallest audible sound. This scale is called the decibel scale or dB scale. Therefore, a logarithmic scale is used to express sound levels meaningfully in more flexible numbers rather than a linear one. Even the obvious fact that in both cases are 6 dB of difference, it represents very different level changes to our hearing system (logarithmic scale!).īTW: I used a very limited audio recording/editing software in the time when we used MS-Windows 3.1 and that software had the logarithmic scale to show the audio waves. What is the Decibel Scale The human ear has the ability to handle an immense range of different sound levels. This scale measures the magnitude of an earthquake, which is the amount of energy released by it. The Richter Scale - Earthquakes are measured on the Richter Scale, which is a base 10 logarithmic scale. I’m talking about we are more sensitive to the changes between 0 and -6 dB than a change between -15 and -21 dB. The threshold of pain is about 120 dB and that causes hearing loss. Note: When using this formula in a calculator the use of brackets is important, so that 10 x the log of (P 1 /P 2) is used, rather than 10 x the log of P 1, divided by P 2. The audio wave shown in the Audacity tracks should be looked most near to our ears are accustomed. Converting a power gain ratio to dBs is calculated by multiplying the log of the ratio by 10: Where P 1 is the power at mid band and P 2 is the power being measured. Why logarithmic scale? Simple: This is the way our hearing system works, period! It is not something like a personal election of someone. I just wonder why Audacity uses that linear scale, which is not used in the real audio world (I don’t know any audio recording machine, digital or analog, with any other than the logarithmic scale). I’m not a programmer, sorry!!! I’m just a music teacher and audio technician, sorry!
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