Abstract: The circuit comprises a first sampling/holding circuit, to the input of which is applied the signal to be sampled, a second sampling/holding circuit identical to the first sampling circuit, to the input of which is applied a level of direct electrical voltage, and a differential amplifier coupled by a first input to the output of the first sampling/holding circuit and by a second input to the output of the second sampling/holding circuit. The first and second sampling/holding circuits are controlled with the same control pulses so that the sampled signal given at the output of the differential amplifier is a pure signal rid of the interference sampling signals given by the first sampling/holding circuit.

Abstract: A digital processing circuit for aligning the d.c. component of an analog television signal. The analog signal is connected to one input of a differential amplifier. The output of the amplifier is connected to an analog to digital converter. The output of this converter forms the output of the entire circuit. A correction loop including an error detection circuit and a digital to analog converter is connected from this output to the second input of the differential amplifier. The error detection circuit includes an averaging circuit, a comparator, an adder and a memory register.