There are several types of such systems which consist of a transmitter and a receiver. Your co-operation in wearing the transmitter will benefit the hard of hearing student. Such systems are not recording devices. The use of assistive listening devices is situation-dependent. For example, an infrared listening system may work well in the classroom, but is less effective for an outdoor seminar on the lawn.
Some interpreters also do oral interpreting.
Interpreters are an aid to everyone in the communication process. The latter is considered an independent language with its own distinct grammatical structure. It is not a universal language. For example, deaf people in Mexico use a different sign language than that used in Canada. Since the grammatical structure of ASL is different from English, this may be reflected in a person's written assignments.