| 摘要 |
A serial digital data transmission system wherein pairs of binary input signals are encoded into a self-clocked three-level signal having high, low and intermediate levels for driving over a transmission line with level transitions occurring in response to an applied clock signal, and with a valid signal being employed to indicate data presence. Selectable encoding is provided in response to detecting any accumulated excess of high or low prior transmission levels so as to continually seek maintenance of an intermediate average level for the transmitted signal. The clock and valid signals are regenerated at the receiver for use in deriving the binary signal data from the received three-level signal.
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