Speech pattern matching in non-white noise
First Claim
1. A system for matching an input signal, comprising non-white noise and a patterned signal corrupted by said non-white noise, to a plurality of reference signals, said system comprising:
- an estimator estimating noise features of said non-white noise and producing from said noise features at least one noise whitening filter;
a filter filtering said input signal and said plurality of reference signals using said at least one noise whitening filter and producing a filtered input signal, having a white noise component, and a plurality of filtered reference signals; and
a pattern matcher for matching said filtered input signal to one of said filtered reference signals.
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Abstract
A system for matching an input signal, comprising non-white noise and a patterned signal corrupted by said non-white noise, to a plurality of reference signals, the system including an estimator estimating noise features of said non-white noise and producing from the noise features at least one noise whitening filter; a filter generally simultaneously filtering the input signal and the plurality of reference signals using the noise whitening filter and producing a filtered input signal, having a white noise component, and a plurality of filtered reference signals; and a pattern matcher generally robust to white noise for matching the filtered input signal to one of the filtered reference signals.
23 Citations
33 Claims
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1. A system for matching an input signal, comprising non-white noise and a patterned signal corrupted by said non-white noise, to a plurality of reference signals, said system comprising:
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an estimator estimating noise features of said non-white noise and producing from said noise features at least one noise whitening filter; a filter filtering said input signal and said plurality of reference signals using said at least one noise whitening filter and producing a filtered input signal, having a white noise component, and a plurality of filtered reference signals; and a pattern matcher for matching said filtered input signal to one of said filtered reference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20)
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13. Speech recognition system for recognizing words found in a speech signal corrupted by non-white noise, said system comprising:
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an estimator estimating noise features of said non-white noise and for producing from said noise features at least one noise whitening filter; a filter filtering said speech signal and a plurality of reference signals of selected spoken words, said filter using said at least one noise whitening filter and producing a filtered speech signal and a plurality of filtered reference signals; and a pattern matcher for matching said filtered speech signal to one of said filtered reference signals thereby recognizing the word in said speech signal. - View Dependent Claims (21, 22)
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23. A Vector Quantization (VQ) system for vector quantizing a speech signal corrupted by non-white noise into a sequence of symbols, said system comprising:
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an estimator estimating noise features of said non-white noise and for producing from said noise features at least one noise whitening filter; a filter filtering segments of said speech signal and a plurality of numbered reference signals of selected speech segments, said filter using said at least one noise whitening filter and producing filtered speech segments and a plurality of filtered reference segments; and a pattern matcher for matching each of said filtered speech segments to one of said filtered reference segments and for providing as an output a symbol which is an index of the matched reference segment. - View Dependent Claims (24, 25)
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26. A method for matching an input signal, comprising non-white noise and a patterned signal corrupted by said non-white noise, to a plurality of reference signals, said method comprising the steps of:
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estimating noise features of said non-white noise and producing from said noise features at least one noise whitening filter; filtering said input signal and said plurality of reference signals using said at least one noise whitening filter and producing a filtered input signal, having a white noise component, and a plurality of filtered reference signals; and matching said filtered input signal to one of said filtered reference signals. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification