Input device for computer speech recognition system
First Claim
1. A speech sound input device for providing information to a computer in a system of computer recognition of speech comprising(i) a voiced monitor which provides to the computer a signal indicating whether the sound input to the device has a fundamental repetitive structure, and signals indicating the periodicity of any such structure;
- (ii) an unvoiced monitor which provides to the computer a signal indicating whether the sound input to the device has no low frequency component and has at the same time high frequency components in a wide range of frequency;
(iii) a background monitor which provides to the computer a signal indicating the presence of relatively stable energy in the sound input to the device, characteristic of background noise with an absence of speech, and means for tracking the level of such relatively stable energy;
(iv) a noise color analyzer which provides to the computer, in relation to input sounds having no low frequency component, signals indicating the peak frequency of sound input to the input device, signals indicating the peak amplitude of said sound input, and signals indicating the bandwidth of said sound input; and
(v) a resonant frequency analyzer which provides to the computer, in relation to input sounds having a fundamental repetitive structure, signals indicating the frequency of the resonant content of the input sound and signals indicating its level of correlation.
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Accused Products
Abstract
Systems for the recognition of speech by computer have usually required t the speech be of a strictly standarized nature, free of such features as regional accent, and unaccompanied by background noise. The problem has been to produce a system providing information which will allow accurate recognition in the presence of noise, and with non-standard speech sounds. The invention provides to a computer in a speech recognition system information in parallel streams on a number of factors, viz, the existence, in any signal which may contain speech sounds, of a fundamental repetitive structure and its periodicity; the existence of a high frequency component having a wide frequency band; the existence of a component having energy relatively stable with respect to time and characteristic of background noise; the peak frequency, peak amplitude and band width of sounds lacking a low frequency component; and the frequency of resonant content of any component having a fundamental repetitive structure and the level of correlation.
38 Citations
10 Claims
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1. A speech sound input device for providing information to a computer in a system of computer recognition of speech comprising
(i) a voiced monitor which provides to the computer a signal indicating whether the sound input to the device has a fundamental repetitive structure, and signals indicating the periodicity of any such structure; -
(ii) an unvoiced monitor which provides to the computer a signal indicating whether the sound input to the device has no low frequency component and has at the same time high frequency components in a wide range of frequency; (iii) a background monitor which provides to the computer a signal indicating the presence of relatively stable energy in the sound input to the device, characteristic of background noise with an absence of speech, and means for tracking the level of such relatively stable energy; (iv) a noise color analyzer which provides to the computer, in relation to input sounds having no low frequency component, signals indicating the peak frequency of sound input to the input device, signals indicating the peak amplitude of said sound input, and signals indicating the bandwidth of said sound input; and (v) a resonant frequency analyzer which provides to the computer, in relation to input sounds having a fundamental repetitive structure, signals indicating the frequency of the resonant content of the input sound and signals indicating its level of correlation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of supplying input information in a system of computer recognition of speech which comprises extracting information from an analogue signal which may contain speech and feeding in parallel to a computer, arranged for speech recognition, information derived from said analogue signal
(i) indicating whether the signal has a fundamental repetitive structure and the periodicity of such structure, (ii) indicating whether the signal has no low frequency component and at the same time has high frequency components in a wide range of frequency, (iii) indicating the presence and level of relatively stable energy in the signal, characteristic of background noise with an absence of speech, (iv) indicating, in relation to a signal having no low frequency component, the peak frequency of the signal, the peak amplitude of the signal and the bandwidth, and (v) indicating, in relation to a signal having a fundamental repetitive structure, the frequency of resonant content and the level of auto correlation thereof.
Specification