Ghost reduction device for removing ghost components of a television signal

A ghost elimination device for eliminating, from a television signal, a ghost component as a distortion of a television signal transmission system, said device comprising:

• a noise elimination filter which receives the television signal, with a reference signal used for ghost component detection being multiplexed thereon, and performs noise elimination for the reference signal;
• a transmission path distortion elimination filter, which includes at least a transversal filter with a controllable tap factor, receives the television signal from the output of said noise elimination filter and removes a ghost component as a transmission path distortion;
• and
• a controller which extracts the reference signal from the output signal of said transmission path distortion elimination filter, detects the ghost component as a transmission path distortion based on the reference signal, and operates on said transmission path distortion elimination filter to eliminate the ghost component as a transmission path distortion by controlling the tap factor of the transversal filter in said transmission path distortion elimination filter.

A ghost elimination device for eliminating, from a television signal, a ghost component as a distortion of a television signal transmission system, said device comprising:

• an input terminal for receiving the television signal, the television signal having a reference signal used for ghost component detection multiplexed thereon as a sequence over a plurality of fields;
• decoding means for extracting, by decoding, the reference signal in the form of a sequence from the television signal received on said input terminal;
• noise elimination means for providing noise elimination for the reference signal which has been decoded by said decoding means;
• reference signal insertion means for inserting the decoded and noise-eliminated reference signal to the television signal received on said input terminal;
• a transmission path distortion elimination filter, which includes at least a transversal filter with a controllable tap factor, receives the television signal in which the reference signal has been inserted by said reference signal insertion means, and removes a ghost component as a transmission path distortion;
• and
• a controller which extracts the reference signal from the output signal of said transmission path distortion elimination filter, detects the ghost component as a transmission path distortion based on the reference signal. and operates on said transmission path distortion elimination filter to eliminate the ghost component as a transmission path distortion by controlling the tap factor of the transversal filter in said transmission path distortion elimination filter.

A ghost elimination device for eliminating, from a television signal, a ghost component as a distortion of a television signal transmission system, said device comprising:

• a transmission path distortion elimination filter, which receives the television signal multiplexed with a reference signal used for ghost component detection, includes at least a transversal filter with a controllable tap factor and removes a ghost component as a transmission path distortion;
• a controller which extracts the reference signal from the output signal of said transmission path distortion elimination filter, detects the ghost component as a transmission path distortion based on the reference signal, and operates on said transmission path distortion elimination filter to eliminate the ghost component as a transmission path distortion by controlling the tap factor of the transversal filter in said transmission path distortion elimination filter;
• and
• reference signal blocking means for replacing the reference signal inserted in a line with another signal for the output of said transmission path distortion elimination filter so as to block the passage of the reference signal to a rear stage.

A ghost elimination device for eliminating, from a television signal, a ghost component as a distortion of a television signal transmission system, said device comprising:

• decoding means, which receives the television signal containing a reference signal used for ghost component detection, decodes a transmission sequence that forms said reference signal;
• reference signal inserting means, which receives the transmission sequence signal provided by said decoding means and the television signal, inserts the transmission sequence signal to the television signal;
• a transmission path distortion elimination filter, which includes at least a transversal filter with a controllable tap factor, receives the output of said reference signal inserting means and removes a ghost component as a transmission path distortion from the television signal;
• and
• a controller, which extracts the reference signal from the output signal of said transmission path distortion elimination filter, detects the ghost component as a transmission path distortion based on the reference signal, and operates on said transmission path distortion elimination filter to eliminate the ghost component as a transmission path distortion from the television signal by controlling the tap factor of the transversal filter in said transmission path distortion elimination filter.