1. A method of spoken document retrieval by a system using multiple search transcription indices, the method comprising: receiving an input phrase as a search query formed of query terms; identifying a first type of query term in the input phrase, wherein the first type includes a query term in a speech recognition vocabulary of the system; identifying one or more first search transcription indices for searching the first type of query term; identifying a second type of query term in the input phrase, wherein the second type includes a query term not in the speech recognition vocabulary; identifying a plurality of second search transcription indices for searching the second type of query term; receiving at least a first list of results from the one or more first search transcription indices; receiving plural lists of results from the plurality of second search transcription indices; ranking results from a phonetic index of the plurality of second search transcription indices based on temporal proximity of phones, wherein the ranking computes a score in accordance with the following expression: score ⁡ ( k , t 0 k , D ) = 1 - ∑ i = 1 l ⁢ 5 ⁢ ( t i k - ( t i - 1 k + d i - 1 k ) ) l where k denotes a keyword having phonemes that may occur in a document transcript D at times t i k and having durations d i k ; combining first scores for a first document from the plural lists of results according to a first method to form a first combined list having a second score for the first document; combining one or more third scores of a corresponding document from at least the first list of results with the second score according to a second method different from the first method, wherein the second method comprises evaluating timestamps of words and subwords in the document to determine whether the words and subwords are in a correct order and a difference in time between adjacent words and subwords is within a threshold value, wherein the words and subwords in the document correspond to the input phrase; and outputting search results to a user based in part on the combining the one or more third scores of a corresponding document with the second score.
1. A method of spoken document retrieval by a system using multiple search transcription indices, the method comprising: receiving an input phrase as a search query formed of query terms; identifying a first type of query term in the input phrase, wherein the first type includes a query term in a speech recognition vocabulary of the system; identifying one or more first search transcription indices for searching the first type of query term; identifying a second type of query term in the input phrase, wherein the second type includes a query term not in the speech recognition vocabulary; identifying a plurality of second search transcription indices for searching the second type of query term; receiving at least a first list of results from the one or more first search transcription indices; receiving plural lists of results from the plurality of second search transcription indices; ranking results from a phonetic index of the plurality of second search transcription indices based on temporal proximity of phones, wherein the ranking computes a score in accordance with the following expression: score ⁡ ( k , t 0 k , D ) = 1 - ∑ i = 1 l ⁢ 5 ⁢ ( t i k - ( t i - 1 k + d i - 1 k ) ) l where k denotes a keyword having phonemes that may occur in a document transcript D at times t i k and having durations d i k ; combining first scores for a first document from the plural lists of results according to a first method to form a first combined list having a second score for the first document; combining one or more third scores of a corresponding document from at least the first list of results with the second score according to a second method different from the first method, wherein the second method comprises evaluating timestamps of words and subwords in the document to determine whether the words and subwords are in a correct order and a difference in time between adjacent words and subwords is within a threshold value, wherein the words and subwords in the document correspond to the input phrase; and outputting search results to a user based in part on the combining the one or more third scores of a corresponding document with the second score. 2. The method as claimed in claim 1 , wherein combining the first scores according to the first method comprises using an aggregate sum and OR semantics and combining the one or more third scores according to the second method comprises using an aggregate sum with AND semantics.