db.cpp

// Note that our hearing is logarithmic.
// 0 dB = 1.0
// For the below equations, ratio refers to the amplitude ratio.

// 0 dB = same power = same amplitude = same psycho-acoustic volume
// -3 dB = half power
// -6 dB = half amplitude
// -10 dB = half psycho-acoustic volume = 32% amplitude

double dB_to_ratio(double dB) {
    return exp(10.0, dB / 20.0);
}

double ratio_to_dB(double ratio) {
    return 20.0 * log10(ratio);
}