One of the main factors people look at when deciding which hearing aid to buy is how visible is it. This means; can it easily be seen by others or is it rendered almost invisible to the naked glance. Although with modern technological advances in miniaturization of amplifiers, receivers and speakers as well as in the miniaturization of batteries, which make all modern hearing aids inconspicuous, the only ones which are considered to be invisible are the ones which are located in the ear cannel.
Apart from the invisible hearing aids which are located in the ear cannel, there are two other main types which remain popular today and those are the ones which are located in the outer ear and those which are located behind the ear, both of which are very effective and efficient. The one located in the outer ear works in the same manner as the one in the inner ear and so comprises of a receiver, amplifier and of course speaker, all miniaturized to an appropriate size. The hearing aid which fits behind the ear is different in so far as although all its parts are still miniaturized, they pass sound vibrations onto the bones at the back of the ear which then pass those same sound vibrations directly to the brain. Although the technology for these modern hearing aids may be cutting edge, the theories of how they actually work are hundreds of years old and so are well tried and tested.
For perhaps thousands of years, man has known that certain animals had the ability to hear well, far better than the ability of humans to and it is this knowledge which led our ancestors to carve wooden ears resembling the ears of those animals and use the wooden replicas as hearing aids in the hope that they would assist man in hearing better. Although there is evidence that these animal ear carvings were quite popular, their actual effectiveness is not known. However, the principle of the ear being large at one end and narrow at the other was duplicated to produce the first of what we now call the first real hearing aids.
These officially recognized first hearing aids were known as trumpets and they were of varying lengths but all had one narrow end which could be placed in the ear and another wide end which was used to receive the sounds. In these instances it was the shape of the trumpet which acted as the amplifier but in modern hearing aids, electrical amplifiers are used.
Although most modern hearing aids today operate on the same principle, there are many different ones and brands available and so to ensure someone buys one which is most appropriate for their particular needs, online providers of hearing aids, such as https://www.audika.dk/ will often offer free trials to potential customers in order to assist them in choosing the correct one for their needs. The free trial and the knowledge of hearing aids offered by these providers help ensure that the hard of hearings needs are well catered to.