Induction loop amplifier

Induction loop amplifiers for the hearing injured people. This product is one of the tool of the info-communication accessibility. With the help of the induction loop amplifier we can transmit the sounds through the magnetic field but exclude all the surrounding noises. Once we know exactly the room that needs to be made accessible we can help to choose the best induction amplifier that fulfills the requirements. We provide you with professional help for the development of the permanently installed induction loop. You can save a significant amount of money if you ask for our professional help during the purchase of the induction loop.  Sounds which are noisy, echoing or coming from a farther distance become incomprehensible for those hearing injured people who are wearing a hearing aid. The aim of the hearing set is not to give back in full the hearing scope but to replace the missing speaking frequency in an adequate tone and volume. With this induction amplifier a one way information transmission can be created which may arrive either a single or even from multiple sound sources at the same time. There is a possibility of setting the priority of the arriving sounds. The sounds are using the magnetic field of the induction loop where the whole transmission procedure is happening. It is the task of the audiologyst and the experts on the hearing acoustics to set the nowdays available mostly digital hearing aid sets based on the individual hearing loss of the person in a way that the device is making up for the missing frequencies correctly beside it filters totally out the non useful surrounding voices and noises. Considering that this has not yet been achieved by any of the hearin appliences the EU requires the infromation transmission through the induction magnetic field from our country as well so that people who is wearing such device can obtain a clearly understandable speaking voice. The working of the human brain cannot be made up by the current technology. While a person with proper hearing can understand everything in a noisy environment, the sound arriving through the microphone of the hearing device becomes gibberish. As long as we would like to use the allowance given by the EU for the accessibility provision it would be the most adequate to follow the regulation of the EU and ensure that the device is useful for all who needed.

In this case regarding the induction amplifiers the following basic but very important rules should be obligatory:

1. To measure the level of the electro-nagnetics noise of the location before installation. In case this level is too high in the room because of the electronic network the installation of the indction system is pointless. After the installation of the induction amplifier the sound transmitted through the magnetic field becomes so polluted by the electro-magnetics noise that it will be not better in quality than if the user was taken the sounds by the microphone of the hearing device from the environment. Under this condtition the installation of the induction system in such environment is the waste of money.

2. The scaling of the tone is the second but higly important criteria for everybody for the sake of the efficient usage of the system. During a hearing examination an audiogramm is made which shows those frequency ranges where the hearing injured people has a loss. It also shows the type of this loss. Thease can be totally different. The audiologyst and the the experts on the hearing acoustics has the task to substitute for the missing frequencies at the hearing set so it has the frequencies the closest to the unharmed. There are people who needs the deep voices for other people the high-pitched voices need to be substituted.

In theory after the hearing device is set it transmits the different frequnecies from the environmental sounds in different qunatity toward the tympana.
In case the scailing of the deep, middle and high-pitced voices of the induction amplifier has not been done correctly it can easily happen that in a classroom where there is a working induction system is set up the student who is wearing the device will not be able to hear and understand properly the presentation of the teacher. In rooms where the metal content is quite high the features of the magnetic field are changing. The sounds of the high frequencies are absorbed and cannot reach the target. In order to avoid this the manufacturers of the induction amplifiers in the EU beside the equalizer also have an octaver built into the amplifiers – generally in case of devices having a bigger than 200 m2 coverage – which helps the professionals to substitute for the sound losses durimg the scailing of the system after the installation. Without this the student who in this case has the high frequencies missing will complete his/her long year studies with a totally useless system. That is why it should be a basic criteria not to accept such so called induction systems which are hand made, modified at home and does not comply with the necessary function at all. Every institute which takes part in a tender in order to create the accessibility provision is expecting a clear, feasible system from the executor which is useable. It is very important to pay high attention not only to the total cost of the installation but to the real needs and the features of the location where the induction loop needs to be placed. We always make sure that cost sensitivity and fulfilling the real needs in the best quality are handled together.

3. The appropriate, adequate field strength which can be measured and scaled with the relevant instrument examination is 400mA/m. The third very important criteria which needs to be considered seriously is this magnetic field strength.

The sort explanation of the induction magnetic field: in the heaing aids, depending on their types there is a component beside the microphone known as telephone spool (T-coil). This component can work as a sound source. When the T-coil gets into the magnetic field voltage is induced in it. This incoming sign is converted by the micro-chip of the hearing aid to a clear sound.
There are tests carried out by the companies innovating the induction ampplifiers, the simplified interpretation is as follows:

In a quiet, noiseless environment a hearing injured using a hearing aid and a prperly hearing person is talking to each other. The sounds arriving through the air are clear, the speech depending on the setting of the hearing aid is understandable. The intensity of the sounds arriving to the hearing aid is X. If we open the window and the noises from the outside environment are coming in the speech becomes gibberish. The goal is to create the equivalent of the X in the quiet environment through the magnetic field, where the sound source is not the microphone, but the T-coil, and the noisy sounds of the environment are excluded. The value of this X is determined as 400mA/m by the directives.
If the incorrect induction system is chosen, installed and there is no adequate magnetic field provided the voice transmitted to the person using the hearing aid will be silent. Also if the hearing aid has no volume control or it does not work on full capacity the person using the hearing device will not be able to hear the speech on the right volume.