H - Electricity – 04 – L
Patent
H - Electricity
04
L
350/34, 350/56
H04L 1/08 (2006.01) H04N 7/035 (2006.01) H04N 7/00 (2006.01)
Patent
CA 1152631
PHN 9442 -23- ABSTRACT: An error correction circuit in a television receiver for receiving, for example, Teletext informa- tion, Viewdata information or information of comparable systems. The codes representing symbol information received by the receiver are classified into one out of two or more classes in dependence on the probability of their occurrence, this classification being an indica- tion of the extent to which it is probable that a newly received code is correctly received, if different from the information stored in the corresponding symbol loca- tion. Such a television receiver includes a receiving section, audio and video amplifiers and a picture tube. A text decoder receives symbol information to be stored in an information store which information store can be read out to display text on the picture tube. An error circuit detects whether newly received information is different from the information stored for the same symbol location with the use of a comparator and two parity circuits. Although the code used does not have a parity bit, the parity circuitry is used to determine whether a newly received code has a lower probability of occur- rence than the stored code to inhibit overwriting the information in the information store with the newly received information. In such a case a flag bit for the corresponding symbol location may be set to indicate that the stored code is suspect. Such an error circuit makes it possible to correct nearly 100 percent of the errors in the text as soon as the next text repeat is received even if the used code does not contain any redundancy.
350081
Christis Wilhelmus J.
Janssen Peter J.h.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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