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The Advanced Television Systems Committee, Inc. (ATSC) has approved an amendment to the
A/53C DTV Standard that adds a new optional mode of transmission called
Enhanced VSB (E-VSB). Services transmitted in the E-VSB mode have additional forward error correction coding layers that allow reception under weaker signal conditions. Mark Richer, ATSC president stated:
“E-VSB was developed in response to the desire of broadcasters to add more flexibility to the DTV Standard. E-VSB was chosen from among multiple technologies after a rigorous evaluation process that included laboratory and field tests.”
E-VSB provides optional modes of operation that allow broadcasters to trade-off data rate for a lower carrier-to-noise threshold for some services. Examples of potential applications for E-VSB include delivery of “fall back” audio, programming services targeted at small DTV receivers with indoor antennas, non-real time transmissions of file-based information to handheld and pedestrian receivers, and robust data broadcasting to devices such as desktop and laptop computers.
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