| 摘要 |
<p>A concurrent signaling and data communication system based on the modulation and encoding of digital information using the visible light emitted by light emitting diodes (LEDs) is provided. A general-purpose system includes a transmitter (14a) and receiver circuit (16) coupled to respective computer system (10, 12). The transmitter (14a) is further coupled to an LED beacon (14b), LED dot matrix display (22), or other configuration of LEDs that can be used for simultaneous display and data communication. The computer (10) coupled to the transmitter (14a) is used to control the data communication function of the LEDs, and also may be used to control the display function. A separate computer may also be used to control the display function distinct from the data communication function. The computer (12) coupled to the receiver interprets the data communicated over the optical link between the transmitter (14a) and receiver (16), and may display this information to a user of the system. Two transmitter and receiver designs are provided, one for a non-multi-tasking environment, and the other design for a multi-tasking environment. Several applications of the general-purpose system are provided, including a vehicle speed limiting application, a vehicle location and guidance system application, and a portable traveler information and location system application.</p> |
