| 摘要 |
PURPOSE: To resolve defects such as freeze of an image and block noise when non standard signal is inputted to an image compression circuit in a MPEG encoder, etc. CONSTITUTION: A time base correction circuit 15 stores an input signal to a memory 6 and reads the stored signal in timing delayed for a predetermined time from V synchronization of the nut signal. The circuit 15 resets a reading synchronization generating circuit 9 at each input field. The reset location proceeds 3 H or 10 H from V synchronization for reading. The circuit 15 detects if the input signal is non interlaced signal and field length deviates from standard value and then corrects odd or even order of a synchronization signal and timing of synchronization. If the input signal is a nonstandard signal, the circuit 15 provides a switch 18 which bypass image compression circuits 16, 17.
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