Patent ID: 7233815

Claim:
A radio communication system for a vehicle comprising: a radio communication apparatus mounted on helmets to be worn by a driver and a passenger of said vehicle and including at least a speaker, a microphone and a radio wave transmitter-receiver; and a repeating apparatus mounted on said vehicle side for communicating with said radio wave transmitter-receiver; said radio communication apparatus mounted on one of said helmets communicating with a second of said helmets through said repeating apparatus, wherein the repeating apparatus includes a mute function and attenuates or interrupts when a sound source having a higher priority order and another sound source having a lower priority order interfere with each other, a mixing section for combining signals received from two or more radio communication apparatuses, and a mix/mute section for mixing sound signals outputted from the mixing section, a portable telephone set, and a music reproduction apparatus, and providing an output transmission signal.