1991 年 15 巻 61 号 p. 19-24
Using quadrature modulation of the video carrier, digital sound as well as high frequency component of side panels can be transmitted while keeping the compatibility with NTSC. In this system, if a ghost occurred, phase error of detection axis would occur too. Also crosstalk from main signal quadrature distortion would come up, then multiplex signal would be degraded. In order to receive the multiplex signal without distortion, we used two dimensional waveform equalizer which can compensate the detection axis and eliminate ghosts of the multiplex signal, crosstalk from main to multiplex signal and quadrature distortion. The experimental result show the residual crosstalk is reduced 5dB more than the conventional two dimensional waveform equalizer without phase compensation, when -12dB, 90 degree ghost exists. Both of residual ghosts and crosstalk can be reduced to a level to 36-40dB (D/U).