What is the general function of a telecoil in a hearing aid?

The telecoil in a hearing aid primarily functions to enable a direct audio connection with telephones and other compatible devices, such as loop systems commonly used in public venues. It does this by picking up electromagnetic signals from phones or induction loop systems and converting these signals into sound that the user can hear clearly. This is particularly beneficial in reducing background noise and improving clarity when on the phone or in environments where sound systems are employed.

The other functions listed relate to various features of hearing aids but are not associated with the telecoil's purpose. For instance, amplifying ambient sound is a primary function of hearing aids in general, while hindering acoustic feedback and filtering high frequencies pertain to different audio processing technologies within the devices. The telecoil's unique role focuses on facilitating clearer communication through direct audio input from specific electronic sources.