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The ATSC standard (ATSC-E) has a subsection that allows broadcasters to add extra (and variable types) of error correction to their broadcast streams.
* This error correction service is not mandatory in the US, nor is it mandatory in Canada.
* It is not known how many HDTV receivers support this error correction standard.
* For the transmission of HDTV at 720 or 1080, an extra 1% to 3% added error correction codes will help reduce some of ATSC's poorer performance with weak signals under adverse multipath conditions.
* Reception

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