Arrangement for reduction of noise transmitted from a local cable tv network

Arrangement for the reduction of noise transmitted from a local cable TV network (10) within a carrier frequency band serving for the transmission of signals in the return direction from subscriber lines (13) contained in said network (10) to a headend (11) connected to the network, said arrangement comprising an input (14) intended to be connected to the subscriber lines (13), an output (16) intended to be connected to the headend (11), means (21) for evaluating signals incoming at the input (14), and blocking means (17) controllable by said evaluation means (21) and arranged to permit or prevent a transmission of signals corresponding to the incoming signals at the output (16) in dependence upon the evaluation of the incoming signals effected by the evaluation means (21), characterized in that said blocking means are formed by a reprogrammable digital signal processing unit (17), which is connected to the input (14) via an analog-to-digital converter (19) in order hereby to receive the incoming signals in a sampled digital form and which is arranged to generate digital output signals corresponding to portions of the incoming signals, depending upon the existing programming of the signal processing unit (17) and the result of the evaluation of the incoming signals effected by the evaluation means (21), and to deliver said digital output signals to a digital-to-analog converter (24) connected to the output (16).