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# Phonetic Phrase Search

The following diagram shows the modules in HPE IDOL Speech Server that enable phonetic search in a single action.

| The `wav` module reads the audio file and prepares windowed data. a is the resulting audio window series. The `frontend` module takes each window of samples and converts it to a feature vector. f is the feature vector series. The `normalizer` module adjusts the feature vectors to produce normalized feature vectors. nf is the normalized feature vector series. The `phraseprematch` module searches the feature vector time series and creates phrase identification positions, including confidence scores. w is the output time-marked word series. The `wout` module prepares the output phrase labels and time positions for storage and result reporting.

The schema that implements this feature is:

    [MyPhraseSearch]
    a ← wav (MONO, input)
    f ← frontend (_, a)
    nf ← normalizer (_, f)
    w ← phraseprematch (_, nf)
    output ← wout (_, w)

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