Patent ID: 7548172

Claim:
A vehicle communication system, comprising: a light emitting apparatus installed stationarily and configured to emit a visible light to communicate with an operator of a vehicle; a modulator configured to modulate the light emitted from said light emitting apparatus by superimposing a predetermined signal thereon; a light receiving apparatus installed on a vehicle side and configured to receive a plurality of lights emitted from light emitting apparatuses of other vehicles and superimposed with signals; a plurality of phase-locked loops arranged in parallel and each locked at a different frequency such that the plurality of phase-locked loops discriminate between a plurality of the signals which are simultaneously received from the other vehicles; a decoder configured to read out the signals superimposed on the lights received by said light receiving apparatus; a comparison unit configured to compare an identification of the signals with a predetermined identification such that only data with permission is extracted; and notifying means for notifying information based on a signal which is read out by said decoder.