| 摘要 |
A digital communication system using a frequency-independent, high data transmission rate, self-clocking, d.c. balanced data encoding technique. The encoding technique converts two NRZ data bits into a pulse or pulse-pair. The form of the pulse or pulse-pair representing the encoded data bit-pair depends upon the average d.c. level of the previously transmitted pulses. Each pulse of a pulse-pair has a fixed width. The receiver is activated by the leading edge of a transmitted pulse-pair and samples the pulse-pair at points in time determined by the known fixed width of the pulses. The sampled pulse-pairs are then converted into NRZ data bit-pairs. Proper functioning of the receiver does not rely upon the rate upon which the data is transferred. A high data rate is achieved by encoding two bits of data in every pulse or pulse-pair transmitted.
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