| 摘要 |
PURPOSE:To transmit a new information signal except an information signal assigned by its application by separating a synchronizing signal of a video signal of a composite information signal received to detect an overlap position and reproducing the information signals after identitying the information code signal separated from the separated synchronizing signals. CONSTITUTION:A distortion of a reception composite information signal 401 by is corrected and amplified a reception correction amlifier 10. A synchronizing separator 30 separates a synchronizing signal 403 from a composite information signal 402. A vertical synchronizing part detector 40 generates a vertical synchronizing part detection pulse 404 by making use of the period of a vertical synchronizing equalized pulse of the abovementioned synchronizing signal being 1/2 of the horizontal synchronizing pulse period. The vertical synchronizing part detector 60 obtains vertical synchronizing pulses 405-410 from the pulse 404 and signal 403. The code divider 60 extracts information signals 411-416 overlapped in the vertical synchronizing signal part of the composite information signal by the above six vertical synchronizing pulses from the signal 402, supplies said signals to a pattern discrimination circuit 70, discriminates the information code signal comparing with the specified code pattern, and obtains many of information outputs 417l-417n.
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