Patent US3592969A successfully refreshed from Google Patents.
US3592969A
Expired / Lapsed
US
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Speech analyzing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1969-07-22
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Granted: 1971-07-13
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Expires: 1989-07-22
Abstract
Abstract One of the greatest problems tending to occur in an attempt to effect speech recognition with a speech recognition apparatus is that individual difference is present in the speech frequency distribution. Obviously, the apparatus fails to recognize a speech correctly which can naturally be recognized by the human being, if there is such individual difference. This specification discloses an apparatus wherein individual difference is eliminated from the frequency to time pattern to normalize such pattern in an attempt to effect speech recognition, thereby making it possible to achieve accurate speech recognition.
Inventors
- 👤 Hirokazu Yoshino
- 👤 Tomio Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:34
CPC Classifications
G; G10; G10L; G10L15/00; G10L15/06; G10L15/065; G10L15/07
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A speech analyzing apparatus comprising means for detecting the difference in frequency between an input voice and a standard voice signal, means for generating a signal having a frequency corresponding to the output of said detecting means, means for shifting the frequency band of said input voice in accordance with the output of Said signal generating means to normalize said frequency band on a frequency axis, frequency selecting means having a plurality of pass bands which are assigned to the voice signal of which the frequency band has been shifted, means for detecting a signal representing the amplitude of a signal component occurring in each of said plurality of bands and comparing the amplitude of the detected signal and that of a signal occurring in the adjacent band to detect local maximum values of the voice spectrum, and storage means for storing said local maximum values in the order of occurrence thereof.
Claim 2
Dependent Claim
152 words
A speech analyzing apparatus comprising means for detecting the difference in frequency between an input voice and a standard voice signal, means for generating a signal having a frequency corresponding to the output of said detecting means, means for shifting the frequency band of said input voice in accordance with the output of Said signal generating means to normalize said frequency band on a frequency axis, frequency selecting means having a plurality of pass bands which are assigned to the voice signal of which the frequency band has been shifted, means for detecting a signal representing the amplitude of a signal component occurring in each of said plurality of bands and comparing the amplitude of the detected signal and that of a signal occurring in the adjacent band to detect local maximum values of the voice spectrum, and storage means for storing said local maximum values in the order of occurrence thereof.
Claim 3
Dependent Claim
92 words
A speech analyzing apparatus according to claim 1, further including means for dividing the signal obtained by shifting the frequency band of the input voice into a signal component in a lower frequency region contained in the voice spectrum and a signal component in a higher frequency region contained therein, wherein discrimination is made between a voiced sound and a voiceless sound by means for comparing the energy magnitudes of said two signal components so that the discrimination result is stored in said storage means in accordance with the lapse of time.
Claim 4
Dependent Claim
42 words
A speech analyzing apparatus according to claim 1, wherein the input voice is shifted to a higher frequency region in accordance with the output of the means for detecting the difference in frequency between the input sound and the standard voice signal.
Claim 5
Dependent Claim
91 words
A speech analyzing apparatus according to claim 1, wherein the means for generating a signal corresponding to the difference in frequency between the input sound and the standard voice signal is constituted by LC oscillator means including a variable capacitance element and inductance element, and an output resulting from the detection of the difference in frequence between the input voice and the standard voice signal is applied to said variable capacitance element to change the oscillation frequency by changing the capacitance of said variable capacitance element in accordance with said output.
Claim 6
Dependent Claim
61 words
A speech analyzing apparatus according to claim 1, wherein the means for detecting the difference in frequency between the input voice and the standard voice signal is constituted by a differential amplifier to compare the amplitude of an analog signal corresponding to the pitch frequency of the input voice and that of an analog signal corresponding to the standard voice signal.
Claim 7
Dependent Claim
27 words
A speech analyzing apparatus according to claim 1, wherein the means for normalizing the input voice on the frequency axis is constituted by a double balanced modulator.
Claim 8
Dependent Claim
26 words
A speech analyzing apparatus according to claim 1, wherein the means for normalizing the input voice on the frequency axis is constituted by a amplitude modulator.
Claim 9
Dependent Claim
90 words
A speech analyzing apparatus according to claim 1, wherein the means for obtaining the local maximum values of the voice spectrum is constituted at least by an integrator, differential amplifier, upper level discriminator, lower level discriminator and gate circuit, the magnitudes of the outputs of the integrator for one of adjacent frequency bands and said integrator are compared with each other in said differential amplifier, and the output of said lower level discriminator and that of the upper level discriminator for said frequency band are supplied to said gate circuit.
Claim 10
Dependent Claim
56 words
A speech analyzing apparatus according to claim 1, wherein said storage means is constituted by a matrix circuit, and the local maximum values of the voice spectrum are stored in the respective element in the order of occurrence in accordance with the columns for the output of the frequency selecting means appointed by a shift register.
Claim 11
Dependent Claim
79 words
A speech analyzing apparatus according to claim 2, wherein the means for comparing the magnitudes of the two signal components occurring in the lower and higher frequency regions respectively is constituted by differential amplifiers, said two signal components are integrated and then supplied to said differential amplifiers to cause The latter to provide outputs corresponding to the relationship in amplitude between said two signal components, and said outputs are supplied to the upper level discriminators and lower level discriminators.
References Cited (Backward Citations)
US3384839A
Cited
US3518548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |