| 摘要 |
In a modulation and demodulation system for converting a binary sequence composed of a succession of bits, each having a value of "1" or "0", occurring in successive bit intervals, into a transmitted signal containing a representation of each bit, by representing a bit of one value as a change in the level of the transmitted signal at a time corresponding to the middle of the associated bit interval, and representing a bit of the other value as a change in the level of the transmitted signal at a time corresponding to the end of the associated bit interval if a further bit of the other value follows, transmitted signal level changes associated with the bits of the other value are in part suppressed for causing the time period between level changes in the transmitted signal to be no longer than the period of more than two consecutive level changes at intervals equal to each bit interval and associated with the bits of the other value.
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