| 摘要 |
Disclosed is a method for conversion from a field signal to a frame signal in which a field signal delayed by a 1/2 horizontal scanning period and the field signal not subjected to the delay are alternately selected at a time interval of one vertical scanning period by changing over a switch. In the conversion method, the switch is changed over under control of a switching pulse which rises to its high level before the period of preceding equalizing pulses in one field, remains in the high level for one vertical scanning period, then falls to its low level, rises to its high level again during the period of preceding equalizing pulses in the next field, and falls to its low level again during the period of succeeding equalizing pulses and which repeats the above state at a time interval of two vertical scanning periods.
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