Patent ID: 8392812

Claim:
A teletext decoder, for decoding a packet from a teletext signal to generate a teletext, comprising: a sampling module, for sampling the packet according to a sampling clock signal to thereby generate a plurality of sampling points; a slicer level calculator, for acquiring a slicer level according to the packet and generating a plurality of sliced bits according to the sampling points and the slicer level; and an error judgment device, comprising: an error comparator, for comparing the sampling points with a upper level of error range and a lower level of error range, when the first sampling point from the sampling points is between the upper level of error range and the lower level of error range, setting a first sliced bit from the sliced bits corresponding to the first sampling point as an error occurrence bit; and an error corrector, for determining whether the sliced bits are correct and correcting the error occurrence bit in the sliced bits when the sliced bits are incorrect.