Dozens - Correct us if we are wrong but we believe the difference lies in that OCAP relies on a cable signal to provide some of the info where ACAP uses ATSC.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Dozens - Correct us if we are wrong but we believe the difference lies in that OCAP relies on a cable signal to provide some of the info where ACAP uses ATSC.
http://www.atsc.org/standards/a101.html