Abstract: To distinguish between the two fields in a television signal, television synchronizing pulses are applied to a pulse interval detector. The output signal of the pulse interval detector assumes a first signal state when pulse intervals are measured which are located between first and second limit values, and a second signal state when the pulse intervals are outside these limit values. The pulse interval detector is connected to a time measuring element which counts the pulse intervals of the synchronizing pulse when the first signal state is present. The time measuring element produces a field identification signal in dependence on the fact whether, for example, the first signal state is present for a longer period of time for one field than for the other field.