| 摘要 |
An assistive listening device has a housing enclosing both infrared radiation and FM radio receivers and audio amplifier for receiving audio information transmitted to the hearing impaired audience in an auditorium by either infrared or radio radiation. The received radiation is converted to an amplified electrical audio signal. The signal is converted to audible sound by two earphones at the distal ends of two extendable arms. The arms are attached at their proximal ends to the housing. The arms may have two configurations, a compact configuration in which the earphones are retracted to a position against the housing for storage or transport and an extended configuration in which the earphones are at a distance from the housing and spaced apart less than the distance between a user's ears. When the earphones are in the ears, the device is held in place by spring bias with the housing hanging below the chin. For folding into compact configuration the arms may be elastic to bend around the edge of the housing. Alternatively, the arms may be jointed to fold around the housing. When the arm is adjacent the edge of the housing, the entire device is not only more compact for transport and storage, but the fragile arms and earphones are protected from damage. |
