What's the minimum decibel value? I'm trying to scale wave amplitude (0-1) to perceived loudness (still 0-1). The decibel scale seems to be unbounded. For my audio, the amplitude 1 represents a decibel $d$ - i.e. the audio is being played at volume $d$. But what would the decibel be for 0 amplitude? I know 0dB is the minimum a human can hear, but what's the actual minimum. If I can obtain this, then I can successfully convert wave amplitude to perceived loudness (while staying between 0 and 1)
By any reasonable metric, the dB value for zero amplitude is minus infinity.