| 摘要 |
PURPOSE:To execute a good extraction with a simple constitution by estimating an address from the rotating position of a rotating head and extracting a synchronizing pattern using an estimated value and a reproducing address. CONSTITUTION:A signal reproduced from a tape 1 by a rotation head 2 is supplied to a serial/parallel conversion circuit 4 with being demodulated/ waveform shaped at a reproducing circuit 3, and a data and the address are outputted to output terminals 5 and 6. With supplying a reference signal from a terminal 8 to a survo circuit 9, the rotation of a rotating head 2 is controlled and with supplying the reference signal to an address estimating circuit 10, the address corresponding to the rotating position of the rotating head is formed. The estimated value from the address estimating circuit 10 and the reproducing address from the conversion circuit 4 are supplied to a comparison circuit 11 and when they are allowable coincide a coincidence output is supplied to an AND circuit 12 and a detecting signal from a synchronizing pattern detecting circuit 7 is outputted to a synchronizing signal output terminal 13 through the AND circuit 12.
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