The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz
It's not humans you should be considering, it's elephants!Would that be considered infra-sound?
Bats, rats, mice and squirrels vocalise in the 20kHz to 60kHz region.I'm guessing that ultrasonic mics, won't pick up human voices then?
. . . . . If a person talks extremely quietly without even opening their mouth and no one else can hear it. . . . . . .
If a person talks extremely quietly without even opening their mouth