You are enjoying a sci-fi movie where a cool android flies and drops countless bombs but no matter how frequent it explodes, you can’t hear a sound. You tried to turn the volume in its limit but you still can’t hear a thing. Sadly, I think it isn’t the volume you need but a hearing aid.
Hearing aid is an electronic device that the persons with hearing impairments that amplifies sounds for them. It has same elementary components as any public-address system, but all of its parts are tiny and the improved sound is transported to the ear of only the individual who wears the hearing aid. It is worn at the back or inside the ear or in the stem or temple part of eyeglasses.
This consists the amplifier, microphone, battery of a hearing aid, and miniature receiver are bounded either in a shell. A little tube will direct the amplified sound it gets from the receiver into the ear canal of the user of the hearing aid. With only a small protruding part, a unit of this type can fit into the ear canal. A more effective amplifier, typically covered in a frame tinier than a deck of cards, which can be carried without difficulties in a shirt pocket, is required to the individuals with more severe hearing impairments require.
In this, a cord attaches the amplifier to the receiver in the ear. Many types of hearing aids have adjustable controls. Some even have directional microphones. A little vibrator may be held against the mastoid bone behind our ear using a headband, if the injury in hearing is caused by weakened middle ear or deformity of the ear canal. Through the bones of the head to the inner ear, the sound is directed by the vibrator.
The cochlear implant, a newly developed hearing aid is now offered to some deaf persons with severe conditions whose auditory nerves are still functional. To accelerate the auditory nerve of a person with hearing problem, it has electrodes that are inserted in the cochlea of the inner ear which are linked through the mastoid bone to a receiver surgically placed beneath the skin. A microphone close to the ear sends sound signals to a microprocessor, which transforms them into electric signals that are sent to a transmitter at the back of the ear and on to the receiver and cochlear electrodes.
The device significantly adjusts the sound sensitivity for many users of it especially those children and adults who have post lingual deafness, though the implanted cochlear does not duplicate the human voice. It can enhance effectively the capacity of a person with post lingual deafness to comprehend speech, and some users are even able to identify environmental sounds and, even in some instances, in music. It also aids to a smaller amount many of the children and adults with prelingual deafness that happened before a person learned to talk. It can improve talking and speech perception through the continuous use of the device of the children. Can you hear the bombs now? Just joking, the movie’s over.