Abstract: A clamping circuit for a television transmission system, includes an input amplifier whose non-inverting input is connected to the input of the clamping circuit and whose output is connected to the output of the clamping circuit. A negative feedback loop is provided between the output of the clamping circuit and the inverting input of the input amplifier, the negative feedback loop including the series arrangement of a sample and hold circuit and two amplifiers functioning as integrators. A switchable filter switched by the same pulse which switches the sample and hold circuit is provided between the output of the clamping circuit and the signal input terminal of the sample and hold circuit.

Abstract: Arrangement for supervising a CMI-code converter in a PCM-multiplex transmission system, in which a binary signal is converted into a CMI-signal or vice versa, the code converter having a first terminal for the CMI-signal and a second terminal for the binary signal, characterized in that the first input of the code converter is connected to a first input of a modulo-2 divider and also via a delay element to a second input of a modulo-2 divider, that the output of the modulo-2 divider is connected to a first input of a summing device, that the second terminal of the decoder unit is connected to a second input of the summing device and that the supervising signal is produced at the output of the summing device.