2. A computer-implemented method for processing audio content, comprising: generating word lattices for the audio content, the word lattices containing a plurality of word candidates and nodes that are connections between the word candidates; inputting a query from a user containing at least one search term and a desired confidence level; and decorating the query with the desired confidence level and all confidence levels better than the desired confidence level to obtain a decorated query; expanding the decorated query into a plurality of decorated queries based on the desired confidence level; and obtaining search results corresponding to the decorated query and the desired confidence level and displaying the search results to the user.
6. The computer-implemented method of claim 2 , further comprising: indexing the word lattices such that the audio content is contained in a full-text index as indexed audio content; and searching the indexed audio content to obtain the search results.