| 摘要 |
A method of encoding a digital data stream which comprises providing a first stream of clock pulses at a first rate; deriving a second stream of clock pulses from the first stream at a second rate which is an integer sub-multiple of the first rate and less than the minimum bit rate in the data stream; monitoring the data stream for changes in level therein; counting pulses in the first stream starting with the occurrence of a pulse in the second stream; capturing the pulse count when a change in level in the data stream is detected or when the next pulse in the second stream of clock pulses occurs; and upon the occurrence of this pulse in the second stream producing a time domain descriptor of the data by combining the count obtained with information as to the direction of the change in level in the data input stream.
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