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US 4,831,551 AGranted
Speaker-dependent connected speech word recognizer
AssigneeTexas Instruments Incorporated
InventorsThomas B. Schalk, George R. Doddington
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Abstract
Speech recognition is improved using reference pattern templates which have an added noise signal (noise floor) to avoid LPC high-gain synthesizer instability at low signal levels. Also, input signal frames have a length one-half that of reference frames whereby dynamic time warp computation steps are cut almost in half.
Claims4
A method for speech recognition, comprising the steps of:
- storing reference templates containing LPC enters corresponding to a plurality of portions of words in a predefined vocabulary, wherein said templates further include in the LPC parameters a noise signal having a magnitude which is a preselected fraction of the magnitude of the portions of words;
- receiving speech inputs, and transforming the inputs into a plurality of frames of LPC parameters;
- and
- calculating error values indicating the distance between each input frame and each of the reference templets, wherein an utterance is hypothesized to be that of the set of reference templates having the lowest error values.
1 more element
A method for speech recognition, comprising the steps of:
- storing reference templates containing LPC parameters corresponding to a plurality of portions of words in a predefined vocabulary, each of the reference templates having a frame length;
- receiving speech inputs, and transforming the inputs into a plurality of frames of LPC parameters, the input frames having a frame length less than that of the reference frames;
- and
- calculating error values indicating the distance between each input frame and each of the reference templates using dynamic time warping, wherein an utterance is hypothesized to be that of the set of reference templates having the lowest error values.
1 more element
A method for recognizing speech, comprising the steps of:
- storing reference templates containing LPC parameters corresponding to a plurality of portions of words in a predefined vocabulary, wherein the LPC parameters include a noise signal having an energy which is proportional to the energy of the word portions stored in said templates;
- receiving speech inputs, and transforming the inputs into a plurality of frames of LPC parameters;
- and
- calculating error values indicating the distance between each input frame and each of the reference templets, wherein an utterance is hypothesized to be that of the set of reference templates having the lowest error value.
1 more element
Dependencies are inferred from the claim text.