| 摘要 |
<p>An OCR (12) reads the name and address on sequentially conveyed mail (L1, L2, L3, LN). An index number is derived for each name and address for correlating that name and address to r- theta coordinates of file tracks on a CD-ROM disc (60) which is rotated at constant velocity. The index number is derived from the read address to identify the CD-ROM disc containing the desired data and the track containing a nine or eleven-digit zip code for that read address. Four read heads (44, 46, 48, 50) on each of multiple CD-ROM players are used to access the data based on head availability. The read head controllers (16A) have updated r- theta and clocking data for accurately locating a track regardless disc manufacturing and thermal variations and for reading data from any track at substantially the same data rate. A bar code containing a nine or eleven digit zip code, as applicable, is printed on the read letter for later automatic sorting by zip code.</p> |
