| 摘要 |
PURPOSE:To generate accurate control signals by superposing and recording/ reproducing control signals with audio frequencies at the same orthogonal position in the running direction of many channel tracks of a magnetic tape. CONSTITUTION:A magnetic tape 1 is provided with magnetic heads corresponding to tracks 2-5 and information on music, etc., and QUE signals 6-9 are recorded at the same time. As the magnetic tape 1 runs, the magnetic heads 10- 13 reproduce the information and QUE signals recorded on the tracks 2-5. Those reproduced signals are amplified by head amplifiers 14-17 and, while led to output terminals 18-21, rectified by diodes 26-29 through BPFs 22-25 to charge capacitors 30-32. The BPFs 22-25 are tuned to the QUE signals and serve as integration circuits only for the QUE signals. Signals from the integration circuits are inputted to an AND circuit 34 and operate as correct QUE signals only when the QUE signals of all tracks 2-5 are outputted at the same time. |
