公开(公告)号：JPS58103279A

公开(公告)日：1983-06-20

申请号：JP20191881

申请日：1981-12-15

Applicant: SONY CORP

Inventor： KAJIURA MINORU ,  KOUNO TAKASHI ,  KAMAI TOSHIMITSU

IPC: H04N5/922 ,  G11B20/00 ,  G11B20/06 ,  H04N5/928 ,  H04N9/802 ,  H04N9/82

Abstract: PURPOSE:To record the video signal with high density and at the same time to prevent the quality deterioration of the sound signal, by giving a control so that the recording level of the FM-modulated sound signal is varied contrary to the level change of the original sound signal. CONSTITUTION:For the left and right signals SL ans SR of the stereo sound signals supplied through sound input terminals 1 and 2, the modulated output occupying the frequency band different from the video frequency band is set by the frequency modulators 6 and 7 respectively. While a level detector 21 detects the level of the sound signal and produces an output in response to the detected level. Based on this output, the level control parts 17 and 19 change the levels of the modulated outputs given from the modulators 6 and 7 in a contrary way to the level change of the sound signal. This modulated output is mixed 24 with the outputs of the parts 17 and 19. This output signal of mixture is recorded on a recording medium by the recording head parts 30 and 32.