| 摘要 |
PURPOSE:To automize the switching, by detecting whether the data is normal or not and selecting the normal data output or the data after error correction, in reproducing a time code signal recorded as an index together with a video signal. CONSTITUTION:A time code signal Sc reproduced at a magnetic head 1 is inputted to a demodulation circuit 3 via a preamplifier 2, an edge pulse PE is formed at a differentiating circuit 11, a clock signal CK is generated and inputted to a counter circuit 12, and a blanking pulse forming circuit in the circuit 12 is retriggered and a blanking pulse PB of a prescribed width is formed. When a bit having the regularity of the time code signal Sc is inputted, an output PD of an FF 21 is not generated, and if no regularity exists, the output PD is obtained, an FF 25 is set, a bit error pulse PBE is formed, an FF 27 is set, the output selects a changeover switch 5 to broken line side, and the data Dc after error correction is selected in the frame having bit error. |
