WIRELESS TRANSMISSION SYSTEM

摘要

PURPOSE:To obtain the wireless transmission system in which voice transmission is realized by small sized inexpensive transmitter and receiver and voice information is surely sent only to a prescribed area with respect to the wireless transmission system implementing the information offer service by a voice while using an infrared ray is used as a transmission medium in a limited area. CONSTITUTION:The system is made up of a sound source 10 from which a voice signal is sent, a transmitter 1 modulating the voice signal from the sound source 10 and sending the light illuminated with a prescribed directivity in response to the result of modulation as a transmission medium and a receiver 2 receiving the light from the transmitter 1, demodulating the light and reproducing the voice based on the result of demodulation.