AUTOMATIC ERASING SYSTEM FOR FAULT OF GHOST FLUCTUATING AT COMMON RECEIVING POINT

摘要

PURPOSE:To eliminate a ghost having its intensity and fluctuating of delay time, by inserted a ghost eliminating device providing a ghost canceller part at a place near the head end part of a reception point or a master reception antenna. CONSTITUTION:A ghost eliminating device 11 is inserted at a place near the head end 3 of a reception point or a master reception antenna 2 at a part before a trunk line. A synchronizing wave detection tuner part 12 of the device 11 detects the received TV radio wave and demodulates it into a video signal. A ghost canceller part 13 receives the demodulated video signal and produces a negating signal corresponding to the intensity and delay time of the ghost. An RF modulating part 14 turns the video signal free from ghost into the original TV radio wave and sends it to the trunk line. Thus the free follow-up is possible to the fluctuation despite the fluctuation generated to the reflected wave quantity of the channel difference. This ensures a supply of pictures of good quality which are free from any ghost.