Patent ID: 7110041

Claim:
A teletext data separation apparatus comprising: at least one A/D converter for converting teletext data superimposed on a composite video signal to digital data; a digital operation circuit for generating the teletext data from the digital data; an adder and a divider for generating a slice level by sampling the digital data associated with the teletext data by a predetermined number of sampling points; an offset register for setting a specified offset value to the slice level in response to the sampling points; a slice timing control circuit for controlling said adder and said divider; a comparator for comparing the teletext data outputted from said digital operation circuit with the slice level to which the offset value is set to restore original teletext data; a register for setting by its register value the number of sampling points of said adder and said divider; and means for varying the register value of said register in response to a reception state to increase the predetermined number of the sampling points.