US3746791A
Expired / Lapsed
US
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Speech synthesizer utilizing white noise
Assignee: Individual
•
Filing: 1971-06-23
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Granted: 1973-07-17
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Expires: 1991-06-23
Abstract
Abstract The present invention relates to a system and corresponding subsystem devices for synthesizing and codifying speech from broadband white noise. The system employs a gaussian white noise source, the output of which is fed through an orthogonal filter to produce a set of random orthogonal functions. These orthogonal functions when multiplied by a speech signal and temporally averaged, produce a set of slowly time-varying coefficients which can be used to reproduce a voice signal. This device is somewhat analogous to the use of generalized Fourier coefficients to define a periodic function.
Inventors
- 👤 A Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:25
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
72 words
A system for synthesizing speech from white noise, comprising: means for producing a set of speech extraction coefficients responsive to an input speech signal sample; means for producing a set of orthogonal noise sample functions; means for multiplying each said speech extraction coefficient with a respective orthogonal noise sample function; means connected to the output of said multiplier for summing the outputs of said multiplier to reproduce said input speech signal sample.
Claim 2
Independent Claim
72 words
A system for synthesizing speech from white noise, comprising: means for producing a set of speech extraction coefficients responsive to an input speech signal sample; means for producing a set of orthogonal noise sample functions; means for multiplying each said speech extraction coefficient with a respective orthogonal noise sample function; means connected to the output of said multiplier for summing the outputs of said multiplier to reproduce said input speech signal sample.
Claim 3
Dependent Claim
60 words
The system of claim 1, wherein: said means for generating said set of speech extraction coefficients includes: means for producing another set of orthogonal noise sample functions; means for multiplying each said orthogonal noise sample function of said another set with said input speech signal sample to produce a set of product sample functions from which said coefficients are derived.
Claim 4
Dependent Claim
50 words
The system of claim 1 wherein said means for producing said set of speech extraction coefficients includes means for temporally averaging each product sample function to produce said set of speech coefficients and wherein said coefficients at the outputs of said averaging means are described mathematically by the following equations,
Claim 5
Dependent Claim
29 words
The system of claim 3, wherein: said speech signal sample has a duration To and said averaging time T is at least equal to said speech sample time To.
Claim 6
Dependent Claim
42 words
The system of claim 3, wherein: said means for summing comprises an adder connected to the output of said means for multiplying said each coefficient with a respective sample function, to sum the outputs thereof in accordance with the following mathematical expression:
Claim 7
Dependent Claim
45 words
The speech synthesizer of claim 5, wherein said means to generate said set and said means to generate said another set of orthogonal noise sample functions each include: an orthogonal filter coupled to a source of white noise for producing said orthogonal noise sample functions.
Claim 8
Dependent Claim
43 words
The system of claim 6, wherein: the response to the respective white noise sources of said orthogonal filters for producing said set of orthogonal noise functions and said orthogonal filters for producing said another set of orthogonal noise functions is substantially the same.
Claim 9
Dependent Claim
51 words
The system of claim 7, wherein: said source of white noise used to generate said speech coefficients has a spectral power density N2 watts per cycle and where said source of white noise applied to said orthogonal filter for reconstructing said speech has a spectral power density 1/N2 watts per cycle.
Claim 10
Independent Claim
96 words
A method for synthesizing speech comprising the steps of: generating a speech signAl sample; generating a first set of orthogonal noise sample functions; multiplying each of said orthogonal sample functions with said speech signal sample; averaging the output of each said product of the multiplication of the orthogonal sample functions with the speech signal sample to generate a set of speech extraction coefficients; generating a second set of orthogonal noise sample functions; multiplying each said speech coefficient with a respective function of said second set of orthogonal noise sample functions to reconstruct said speech signal sample.
Claim 11
Independent Claim
96 words
A method for synthesizing speech comprising the steps of: generating a speech signAl sample; generating a first set of orthogonal noise sample functions; multiplying each of said orthogonal sample functions with said speech signal sample; averaging the output of each said product of the multiplication of the orthogonal sample functions with the speech signal sample to generate a set of speech extraction coefficients; generating a second set of orthogonal noise sample functions; multiplying each said speech coefficient with a respective function of said second set of orthogonal noise sample functions to reconstruct said speech signal sample.
Claim 12
Dependent Claim
80 words
The method of claim 9, wherein: said steps of producing said orthogonal sample functions include the step of connecting a source of white noise with a spectral power density of N2 watts per cycle to an orthogonal filter to produce said orthogonal sample functions for producing said speech extraction coefficient and; connecting a white noise source having a spectral power density 1/N2 watts per cycle to an orthogonal filter for producing said orthogonal noise function, for reconstructing said speech signals.
Claim 13
Dependent Claim
68 words
The method of claim 10 wherein: the steps of generating a first set of orthogonal noise functions is accomplished through an orthogonal filter having a transfer function substantially identical to said filter for producing said second set orthogonal filter sample functions; multiplying each of said second set of orthogonal noise functions with said speech extraction coefficients; and summing the output of each multiplier to construct said speech signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |