SELF-CLOCKING DIGITAL DATA SYSTEMS EMPLOYING DATA-COMPARISON CODES AND ERROR DETECTION

摘要

Coded information, which may be stored in storage media, is decoded and reproduced. The retrieval system may be self-clocking, with decoding being accomplished by comparing pairs of data events or conditions. Messages may be composed of three types of bits, one of which is a special type which permits checking the quality of message reproduction. The special type of bit is designated when the result of an event comparison is within a controlled range of uncertainty. Novel decoding and slope detecting circuits are disclosed.