Speech recognition system
First Claim
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1. A speech recognition system comprising:
- a first microphone for picking up input speech signals;
a speech-signal-duration determining unit for determining speech signal durations by monitoring the amplitude of the input speech signals;
a recognition unit for determining recognition results by analyzing and recognizing signals given in said speech signal durations;
a second microphone provided to pick up ambient noises;
means for measuring the intensity of input signals given from said second microphone; and
a rejection unit which, when the intensity of said noise exceeding a predetermined standard value is detected in any of said speech signal durations, rejects the recognition results determined by said recognition unit.
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Abstract
A speech recognition system adaptable to noisy environments is disclosed. The system includes a recognition unit for recognizing input speech signals and a noise measuring unit for measuring the intensity of ambient noises. The system also includes a rejection unit responsive to a rejection standard controlled by the intensity of the measured noise for rejecting the rejection results given from the recognition unit when the rejection standard is exceeded.
71 Citations
7 Claims
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1. A speech recognition system comprising:
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a first microphone for picking up input speech signals; a speech-signal-duration determining unit for determining speech signal durations by monitoring the amplitude of the input speech signals; a recognition unit for determining recognition results by analyzing and recognizing signals given in said speech signal durations; a second microphone provided to pick up ambient noises; means for measuring the intensity of input signals given from said second microphone; and a rejection unit which, when the intensity of said noise exceeding a predetermined standard value is detected in any of said speech signal durations, rejects the recognition results determined by said recognition unit. - View Dependent Claims (2, 3, 4, 5)
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6. A speech recognition system comprising:
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a speech microphone provided to pick up input speech signals; means for calculating the amplitude of the speech signals picked up by said speech microphone; a noise microphone provided to pick up ambient noises; means for calculating the intensity of the noises picked up by said noise microphone; a speech-signal detecting unit for determining speech signal durations by monitoring the amplitude of said speech signals compensated for by the intensity of said noises; a recognition unit for recognizing said input speech signals given in speech signal durations; and a rejection unit which, when the intensity of said noise exceeding a predetermined standard value is detected in any of said speech signal durations, rejects the recognition results determined by said recognition unit.
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7. A speech recognition system comprising:
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a first microphone for picking up input speech signals; a speech-signal-duration determining unit for determining speech signal durations by monitoring the amplitude of the input speech signals; a recognition unit for determining recognition results by analyzing and recognizing signals given in said speech signal durations, having analyzer means for receiving said input speech signals and generating a digital output representing a time series of spectrum vectors, buffer means receiving the digital output of said analyzer means for temporarily storing said digital output in response to an output from said speech-signal-duration determining unit, reference pattern memory means for digitally storing reference patterns represented by a plurality of time series of spectrum vectors, and matching the contents of said buffer means with one of the reference patterns stored in said reference pattern memory means and generating a recognition output and a similarity measure signals; a second microphone provided to pick up ambient noises; means for measuring the intensity of input signals given from said second microphone; and a rejection unit for rejecting the recognition results by said recognition unit, having threshold control means for setting a threshold value in response to the output of said noise intensity measuring means, comparator means receiving said similarity measure signal from said matching means and comparing said similarity measure signal with said threshold value for generating a gating signal, and gate means responsive to said gating signal for selectively passing said recognition output from said matching means.
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Specification