Abstract: In the context of recording program contributions, in particular television transmissions, it is frequently undesirable for the advertising blocks broadcast during the transmission also to be recorded and displayed in the event of subsequent reproduction. The invention is concerned with the problem of reliably suppressing such advertising blocks in the event of subsequent reproduction. To that end, it proposes firstly recording the transmission including the broadcast advertising blocks and then carrying out a search during which the beginning and the end of the advertising blocks (WU1–WU3) are marked.

Abstract: At the onset of ageing or in the further course of their service life, color picture tubes relatively frequently exhibit a rise in the field strength between the cathode (K) and the Wehnelt electrode (G1) of the respective beam system on account of a blooming effect of the cathodes (K) which is known per se and reduces the spacing between cathode (K) and Wehnelt electrode (G1). The cut-off regulation reacts to an effect of this type in a manner such that the reverse voltage acting between cathode (K) and Wehnelt electrode (G1) is correspondingly reduced in order to be able to drive the same reference cathode current. However, the reaction of the cut-off regulation must be taken into account for the circuit design since this would otherwise result in an unacceptable reduction in the modulation range, which would, in turn, have an adverse effect on the maximum contrast setting.