| 摘要 |
PURPOSE:To realize a sonar signal recording system that can assuredly detect a sweep synchronizing signal, by recording only the presence or absence of a data with the sweep synchronizing signal. CONSTITUTION:The information signal A of numbers of channels is recorded on a VTR5 with each channel under the control of a synchronizing circuit 2. Meanwhile plural sweep synchronizing signals C are supplied to a parallel-series converting circuit 9. When the recording of the signal A is over, the circuit 9 is controlled by the circuit 2. Then the parallel information stored in the circuit 9 is transmitted in accordance with the presence or absence of the signal, and thus the sweep synchronizing signal is recorded on the VTR5. The sweep synchronizing signal is put outside the band characteristics of a corresponding filter by a system with which only the presence or absence of a data is recorded and although the frequency of a reproduced signal has the fluctuation by the uneven rotation of the VTR. Thus the sweep synchronizing signal can be detected assuredly with no fault, and a video display can be reproduced for the state of detection. |
