| 摘要 |
PURPOSE:To assure the head searching of a PCM signal at the time of sound recording/reproducing by using a signal tack pulse which is used for servo drive of a cylinder for helical scan head of a VTR. CONSTITUTION:At the time of recording, the vertical synchronizing signal is extracted from a signal input 15 and then divided to give the servo drive to a motor 5 with a reference signal of 30Hz. At the time of reproduction, the motor 5 receives the servo drive on the basis of the 30Hz output of an oscillator 13. In this case, the output 16 of the FF9 is always proportional to the revolution of a cylinder 4 at the time of both sound recording and reproducing. At the same time, a signal having a relative relation with a video recording pattern is obtained. The timing obtained by delaying the output 16 by a delay circuit 17 is applied to a head searching signal of a PCM signal. Then the PCM signal is recorded at the position obtained with a delay through the circuit 17. Thus the relative position can always be decided for the recording pattern with an input video signal. |
