| 摘要 |
For supply to a time division multiplexer (11) for multiplexing a predetermined number of digital multiplexer input signals bit by bit into a multiplexed signal in which a long pathological pattern is suppressed and which is supplied preferably to an optical network, a parallel scrambler (13) subjects a plurality of digital video signals to scrambling of a prescribed number of scrambling stages with the prescribed number selected greater than the predetermined number. Produced by the scrambler, scrambled signals, equal in number to the digital video signals, are used in the digital multiplexer input signals preferably with an inverter (15) used to invert one of the scrambled signals so that the predetermined number is equal to one plus the plurality. <IMAGE> |
