Serving advertisements with (e.g., in) audio documents may be improved by
(a) accepting at least a portion of a document including audio content,
(b) analyzing the audio content to determine relevancy information for
the document, and (c) determining at least one advertisement relevant to
the document using at least the relevancy information and serving
constraints associated with advertisements. The advertisements may be
scored if more than one advertisement was determined to be relevant to
the document. Then, at least one of the advertisements to be served with
an ad spot for the document may be determined using at least the scores.
Examples of documents include radio programs, live or recorded musical
works with lyrics, live or recorded dramatic works with dialog or a
monolog, live or recorded talk shows, voice mail, segments of an audio
conversation, etc. The audio content may be analyzed to determine
relevancy information for the document by converting the audio content to
textual information using speech recognition. Then, relevancy information
may be determined from the textual information.