I am studying the mel-frequency cepstral coefficient (MFCC) and have downloaded a pdf which is related to MFCC from this link. It is about the "ETSI ES 201 108"
I am curious about the 4.2.5 Energy Measure
How can they calculate a floor that makes sure that the result is not less than -50? I don't know the reason why the result is not less than -50. Would you know why and explain for me?