A study of low-cost, robust assistive listening system based on UHF wireless technology

In this paper, we describe the development of a low cost wireless UHF broadcasting system prototype. It is designed for a short range application, with up to ten receivers, such as one used in a classroom for hearing impaired students. This system is intended to be a low cost alternative to an existing FM system, with additional capability in security with an encryption function. Additionally a multimode function including one-to-one, one-to-many and broadcast is added. Test results show that the system operating range is approximately ten metres, and the sound quality is close to telephone quality. The broadcasting mode and system range fit the requirements for small classroom use.