| 摘要 |
<p>PURPOSE:To obtain an easy to see video image by outputting a MUSE base band signal fed to an LPF to an NTSC signal reproduction display device via an A/D converter, a D/A converter and a down-converter. CONSTITUTION:Only a MUSE signal subject to band compression in 8.15MHz from a MUSE base band signal demodulated passes through an LPF 1 and the result is inputted to an A/D converter 2, converted into a digital signal and fed to a digital filter circuit 3. The digital filter circuit 3 reduces a loopback component included in a high frequency portion of the MUSE signal and outputs it to a MUSE downconvert circuit 4. The MUSE down-convert circuit 4 applies digital signal processing to the inputted MUSE signal to convert it into an NTSC signal, the result is fed to a D/A converter 5, in which the NTSC signal is converted into an analog signal and it is fed to an NTSC signal reproduction display device via a down-converter, where the signal is viewed.</p> |
