Method for processing teletext data present in a television signal

Method of processing teletext data present in a television signal, comprising:

• separating out a data stream from the television signal,
• gathering together the data appertaining to a respective teletext page as teletext rows;
• storing the thus compiled teletext pages in a buffer stored,
• selecting and decoding a control frame from a data stream by means of a bit by bit comparison with a frame word,
• continuing and counting the clock rate of the items of teletext data of a last television line when decoding the control frame,
• the following steps being carried out in dependence on coincidences occurring during the bit by bit comparison with the frame word:
• a) if, during the bit by bit comparison, eight coincidences are detected, the control frame is considered to have been identified and the counter is reset;
• b) if less than eight coincidences are detected, it is determined whether a particular number or a multiple of the particular number has been reached on the basis of the count-state of a clock pulse counter, whereby, in the event that this number has been reached, the control frame is considered to have been identified and the clock pulse counter is reset, and
• in a learning mode, detecting and storing the instantaneous states of the counter, between the individual television lines that are occupied by items of teletext data, and
• depending upon the line concerned, using the stored counter states for the detection of frame words which have been subjected to interference.