Speech recognition question

[GraemeT]

Developers, a question for you if I may, as I am curious. After owning an 820 for two months I've just downloaded the English (United Kingdom) speech recognition pack. Says it was 21MB. Have just had a play. At first off it seems awesome, but 21MB to do all that? Am I right in supposing that the download is just a dictionary and that the speech algorithms are part of OS? Just idle curiosity really.