AUDIO COMMENTARY SYSTEM

摘要

Orator units are associated with particular exhibit or guiding locations and provide an audio commentary by the medium of ON and OFF states of electromagentic radiation. Auditor units are portable units associated with particular viewers or users and are adapted to detect the electromagnetic radiation and produce therefrom the audio commentary. The auditor unit may be designed to signal, the orator through ON or OFF states of electromagnetic radiation the request for a commentary. The orator unit may be designed to provide a commentary in response to the auditor request. An orator may be designed to provide a plurality of commentaries on corresponding frequency modulation (FM) channels (which are converted to and from electromagnetic radiation) and the orator and auditor may be designed so that the orator may tune the auditor to demodulate only the FM channel corresponding to the auditor's selected type and time of commentary. A plate encoded with conducting and non conducting areas may be used to encode an auditor unit to cause it to select the type of commentary desired by a viewer or user.