Enhanced hearing is the ability to perceive and interpret sound at a decibal level greater than the average human. Such a power is most commonly found amongst cyborgs and superheroes. The character of Jaime Sommers from the 1976 ABC action series The Bionic Woman possessed enhanced hearing by way of a cybernetic implant.
In Marvel Comics, the masked crime-fighter Matt Murdock possesses heightened senses as well as a radar sense to compensate for being blind. Daredevil's sense of hearing enables him to detect an acoustic pressure change of one decibel at a pressure level of seven decibels (whereas the lowest threshold for average human hearing is twenty decibels). He can hear a person's heartbeat at a distance of over twenty feet, or people whispering on the other side of a standard soundproofed wall. Through practice, Daredevil is able to control his hearing acuity, mentally blocking out specific sounds like his own breathing and heartbeat, all ambient sounds to a normal human level of perception, or all sounds but a particular sound he is concentrating upon.