ベースバンド1チャンネル記録方式HDVTRにおけるS/N改善検討

抄録

An HD VCR, which can record and reproduce HD baseband signals by using a single-channel recording method, has been developed. The VCR has realized a high picture-quality and long-time recording of wideband HD baseband signals. In this paper, the SNR improvement techniques used in the VCR are described. In a wideband recording system with an FM recording method, a drastic SNR improvement can be obtained by suppressing the triangular noise caused by FM signal Processing. In this study, the optimum equalization characteristics have been analized. Then an equalizer circuit with a dynamic or non-linear property, which can realize linearly descending characteristics by keeping the white-black inverting margin, has been developed. As a result, by improving the performances of both equalizer and emphasis circuits, a total SNR improvement value of 8 dB has been achieved.