A common, difficult listening situation is one in which there is background noise. In other words, there is a poor signal-to-noise ratio. Noise and distance problems can often be overcome by using assistive listening devices to deliver the signal from the sound source to the ear of the listener. These systems provide a favorable signal-to-noise ratio and are good to use with equipment (e.g., television, radio), in one-on-one conversations, in group conversations, in the car, and at meetings, church, theater, etc.
Wireless Systems
FM and Infrared Systems (see Westone Labs) incorporate wireless means (via radio waves of invisible light beams) to connect the listener to the sound source. Both types of systems can be used for television viewing. These systems are lightweight, rechargeable and have high sound quality. FM systems can also be accessed by means of a boot (adaptor) that fits onto a behind-the-ear hearing aid. The speaker wears an FM transmitter and the adaptor (receiver) picks up the signal (via computer, television, telephone, individual speaker) that is transmitted via the hearing aid. This provides a good quality signal without the interference of background noise or distance (see Phonak).
Other Systems
Other systems that may assist the hearing impaired listener are amplified telephones, blinking light doorbells, vibrating, flashing lights or sonic boom alarm clocks, sonic boom smoke alarms, etc. (see ADCO, Inc).
