| 摘要 |
A PCM code conversion and transmission system in which a code signal representative of an information signal is transmitted in the form of a train of multilevel pulses spaced by a clock pulse interval. A plurality of groups of pulses are extracted from the train at a predetermined interval equal to an integral multiple of the clock pulse interval, the groups having a time lag of one clock pulse interval from one group to another, and each group independently integrated. Means are provided for inverting the polarity of at least one level of the multilevel pulses in response to the time integration in each group to cancel the DC component and eliminate select frequency spectrum components.
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