| 摘要 |
PURPOSE:To attain long-time recording and to reduce deterioration of sound quality due to the long-time recording by recording a stereophonic composite signal (voice signal) transmitted from an FM broadcase station in a video track of a video tape recorder and reproducing the recorded contents. CONSTITUTION:A stereophonic composite signal A after FM detection is outputted from an FM tuner 1 and a transistor (TR) Q1 is switched by an output signal F from a voltage controlling oscillator 2. An output signal D from a synchronizing signal generator 3 switches a TR Q2 and also changes the output level on the lower side of the TR Q1. Variable resistors VR1, VR2 adjust switched signal levels respectively. The impedance of an input signal B to a VTR 5 is matched by a buffer amplifier 4. The output signal C of the VTR 5 is applied to an output terminal 8 through a limiter circuit 6 and a frequency converting circuit 7 and connected to the antenna terminal of an FM tuner 1 or an intermediate frequency amplifying part. Thus long-time recording is performed and the deterioration of sound quality can be prevented. |
