| 摘要 |
In order to control the transmission capacity of the receiving branch of a transmission system comprising this receiving branch as well as a transmitting branch with an echo compensation network, the system generates a level-indicating signal, which indicates, at an output of an amplifier (Am), the signal level contained in the receiving branch, plus a level change-indicating signal, which indicates level changes in this branch. These two signals are linked logically to one another in such manner that the output circuit of the amplifier (Am) is enabled for signal transmission only upon simultaneous occurrence of a level-indicating signal which indicates the presence of a prescribed level and a level change-indicating signal which indicates that a prescribed level change has not been exceeded.
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