Does this adapter really support sound?

I was wondering: for those of us who would like to project video AND sound from our early 2010 MacBooks to our TVs: will I need another cord other than this one to support sound? If this is different from a regular mini display to HDMI adapter, how so? I've tried a mini display to HDMI adapter along with a RCA cable from my headphone jack to the TV, however, sound still doesn't transmit. If this takes care of both problems for an earlier Mac this would be a godsend.

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