Noise compensation in speech recognition apparatus
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United States of America Patent
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Jan 30, 1990
Grant Date -
N/A
app pub date -
Aug 26, 1985
filing date -
Aug 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for noise suppression for speech recognition systems which employs the principle of a least means square estimation which is implemented with conditional expected values. Essentially, according to this method, one computes a series of optimal estimators which estimators and their variances are then employed to implement a noise immune metric. This noise immune metric enables the system to substitute a noisy distance with an expected value which value is calculated according to combined speech and noise data which occurs in the bandpass filter domain. Thus the system can be used with any set of speech parameters and is relatively independent of a specific speech recognition apparatus structure.
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