| 摘要 |
<p>A taxi has four radially extending arrays of LEDs (38A to 38D) mounted one on each hub cap. A local receiver (32A to 32D) in each hub cap receives data representing a desired image from a local transmitter (24) and stores it in a local memory (34A to 34D). A local control unit (36A to 36D) in each hub cap selectively energises the LEDs in the associated array (38A to 38D) in the required sequence (as the hub cap rotates) to produce an apparent image corresponding to the desired image. A central control station (2) supplies data representing the desired image to a receiver (14) in the taxi. This data is only stored in an associated store (20) when a gate (18) responds to a code in the transmitted data corresponding to that particular taxi. The stored data is then downloaded from the memory by the local transmitter (24).</p> |
