Television circuit for changing an interlace factor

A television circuit for changing an interlace factor, the circuit comprising an input for receiving a field synchronizing signal to be processed which, on recording and display, is associated with line rasters which are interlaced or not interlaced, and an output for supplying a processed field synchronizing signal which, on recording and display, is associated with line rasters which which are not interlaced or interlaced differently, the television circuit comprising circuits for periodically shifting triggering pulse edges in the field synchronizing signal to be processed, characterized in that the circuit is suitable for changing an interlace factor by a factor of two or an integral power thereof and by a factor of a half, respectively, and comprises a frequency division circuit which, when the field synchronizing signal to be processed is applied thereto, produces a square-wave output signal having a frequency equal to the field frequency divided by the interlace factor to be obtained, and at least a signal channel comprising a multivibrator circuit which, when the field synchronizing signal is applied thereto, produces a pulse-shaped signal having a pulse duration equal to one line period divided by the interlace factor to be obtained, a first coincidence gate, a first and a second input of which are connected to outputs of the frequency division circuit and the multivibrator circuit and the output of which is connected to a first input of a second coincidence gate provided in the signal channel and having a second input for receiving the field synchronizing signal to be processed and also having an output connected to the output of the television circuit.