| 摘要 |
PURPOSE:To stably and surely discriminate the field of an input picture signal such as a television signal by discriminating whether a signal indicating the field which is detected once with a logic circuit is correct or not again and correcting the error. CONSTITUTION:A circuit which discriminates whether the output of a field detecting circuit 1 is switched at every field or not is provided after the field detecting circuit 1, and the output of the field detecting circuit 1 is selected and outputted by a switch 3 as it is when this switching is carried out. An error correcting circuit is added which selects and outputs the signal obtained by inverting and holding the output of the preceding field of the switch 3 when switching is not carried out. Thus, first field and second field are stably discriminated against the mixture of noise to prevent the malfunction.
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