衛星放送受信時のスレショルド改善の一方法 : 無線・光伝送

抄録

This paper reports a threshold extension method for Direct Broadcasting Satellite [DBS] Reception. Some threshold extension methods for frequency modulation [FM] have studied, but the improved level of these methods is only 1-2dB in NTSC color picture and this is insufficient for DBS reception. The picture quality is improved below threshold level of DBS signal by using following three methods. The first method is the limitation of the bandwidth of the DBS signal. The second method is regeneration of synchronizing pulse of the demodulated television signal. The third method is the replacement of impulse noises. The DBS signal of C/N=4dB can be received using these methods.