Broadcast system for tourist sites

摘要

The transmission and reception system includes a transmitter (E) and a receiver (R1- Rx). A unique frequency carrier is included in a bandwidth with defined upper and lower limits. An audio frequency signal is transmitted. Each receiver includes electroacoustic transducers. Each transmitter and each receiver includes frequency blocking device which operates on the unique frequency. One transmitter of the system is mobile, such as a portable transmitter on board a vehicle. Fixed transmitters are used to determine location of the mobile transmitter.