13. The voice search system of claim 12 wherein the speech recognition system is configured to generate at least one of the features as a speech recognition feature indicative of an accuracy of speech recognition of the spoken input.
13. The voice search system of claim 12 wherein the speech recognition system is configured to generate at least one of the features as a speech recognition feature indicative of an accuracy of speech recognition of the spoken input. 14. The voice search system of claim 13 wherein the search system is configured to generate at least one of the features as a search feature indicative of an accuracy of the search result, given the query.