Means for cancelling ghost signals in response to the reception of a non-standard television video signal

A ghost canceling circuit comprising:

• an A/D converter for covering a received analog video signal into digital video signals, said analog video signal containing vertical and horizontal synchronizing signals and a color subcarrier;
• a ghost canceling filter including a variable delay circuit for receiving and delaying digital video data which is to be outputted, a delay value of said variable delay circuit being controlled by delay control signals, a transversal filter for receiving and controlling an output from said variable delay circuit in response to a tap gain thereof, said tap gain of said transversal filter being controlled by tap gain control signals, and an adder for adding an output of said transversal filter to said digital video signals in order to output said digital video data which is to be outputted,
• a filter control circuit including a timing signal source for generating a set of timing signals in response to said vertical and horizontal synchronizing signals and said color subcarrier contained in said analog video signal, an extractor for extracting associated ghost signals from said digital video signals in response to said timing signals, a tap gain control signal generator responding to said associated ghost signals for generating tap gain control information a delay control signal generator for responding to said associated ghost signal in order to generate and supply said delay control signals to said variable delay circuit, a standard signal discriminator responding to said horizontal and vertical synchronizing signals and said color subcarrier for generating a discrimination signal when said analog video signal is based on a standard broadcasting system, and a setting circuit for transferring said tap gain control information to said transversal filter as said tap gain control signals when said discrimination signal is generated and for changing a value of said tap gain control signals to zero irrespective of said tap gain control information when said discrimination signal is not generated.