| 摘要 |
The invention relates to the simultaneous transmission of of number of carrier modulated video channels wherein each of a number of stations has assigned to it transmitter and receiver channels,, different carrier frequencies, at least each of said transmitter carriers being adjustable to the carrier frequency of at least some of the other transmitters; means for adjusting the assigned carrier frequency of one of said transmitters to a carrier frequency assigned to another transmitter, and means under control of said adjustment substantially simultaneously to adjust the carrier frequency assigned to said other transmitter to the carrier frequency assigned to the first transmitter so as to permit the two stations, the receiver carrier frequencies of which remain unchanged, upon being called upon by one of said stations to exchange video information substantially simultaneously.
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