Patent US4187397A successfully refreshed from Google Patents.
US4187397A
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Device for and method of generating an artificial speech signal
Assignee: Telecom Italia SpA
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Filing: 1978-06-16
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Granted: 1980-02-05
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Expires: 1998-06-16
Abstract
Abstract To produce a signal simulating the characteristics of the average human voice, a basic periodic waveform with generally sinusoidal sections separated by level sections is passed through a first filter for substantially equalizing its frequency components and is then shaped in a second filter whose transfer function approximates that of the vocal tract in a frequency band of 0 to 4 kHz. The basic waveform fed to the first filter may be modulated in amplitude and/or recurrence period by a pseudorandom signal from an ancillary generator.
Inventors
- 👤 Giulio Modena
- 👤 Stefano Sandri
- 👤 Carlo Scagliola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:58
CPC Classifications
G; G10; G10L; G10L25/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A method of producing a simulated voice signal for measuring the performance of voice-transmitting equipment, comprising the steps of: generating a periodic waveform whose frequency components substantially correspond to those produced, within a predetermined frequency range, by glottal excitation of the vocal tract; converting said periodic waveform into an intermediate signal in which the amplitudes of said frequency components are substantially equalized; and transforming said intermediate signal into an output signal in which the amplitudes of said frequency components correspond substantially to those of the voice spectrum in said predetermined frequency range.
Claim 2
Independent Claim
92 words
A method of producing a simulated voice signal for measuring the performance of voice-transmitting equipment, comprising the steps of: generating a periodic waveform whose frequency components substantially correspond to those produced, within a predetermined frequency range, by glottal excitation of the vocal tract; converting said periodic waveform into an intermediate signal in which the amplitudes of said frequency components are substantially equalized; and transforming said intermediate signal into an output signal in which the amplitudes of said frequency components correspond substantially to those of the voice spectrum in said predetermined frequency range.
Claim 3
Dependent Claim
19 words
A method as defined in claim 1 wherein said predetermined frequency range is between substantially 0 and 4 kHz.
Claim 4
Dependent Claim
25 words
A method as defined in claim 1 wherein said periodic waveform consists of a generally sinusoidal section and a substantially level section in each cycle.
Claim 5
Dependent Claim
45 words
A method as defined in claim 1, 2 or 3, comprising the further step of subjecting at least one of two parameters of said periodice waveform, respectively representing the amplitude and the recurrence period thereof, to pseudorandom variations before converting same into said intermediate signal.
Claim 6
Independent Claim
107 words
A device for producing a simulated voice signal for measuring the performance of voice-transmitting equipment, comprising: signal-generating means emitting a periodic waveform whose frequency components substantially correspond to those produced, within a predetermined frequency range, by glottal excitation of the vocal tract; first filter means connected to receive said periodic waveform for converting same into an intermediate signal in which the amplitudes of said frequency components are substantially equalized; and second filter means connected to receive said intermediate signal for transforming same into an output signal in which the amplitudes of said frequency components correspond substantially to those of the voice spectrum in said predetermined frequency range.
Claim 7
Independent Claim
107 words
A device for producing a simulated voice signal for measuring the performance of voice-transmitting equipment, comprising: signal-generating means emitting a periodic waveform whose frequency components substantially correspond to those produced, within a predetermined frequency range, by glottal excitation of the vocal tract; first filter means connected to receive said periodic waveform for converting same into an intermediate signal in which the amplitudes of said frequency components are substantially equalized; and second filter means connected to receive said intermediate signal for transforming same into an output signal in which the amplitudes of said frequency components correspond substantially to those of the voice spectrum in said predetermined frequency range.
Claim 8
Dependent Claim
44 words
A device as defined in claim 5 wherein said first filter means has a transfer function which is substantially the inverse of the amplitude spectrum of said periodic waveform, said second filter means having a transfer function approximating that of the average vocal tract.
Claim 9
Dependent Claim
30 words
A device as defined in claim 6 wherein said second filter means has constant parameters and poles but no zeros in a frequency range between substantially 0 and 4 kHz.
Claim 10
Dependent Claim
52 words
A device as defined in claim 5, 6 or 7, further comprising an ancillary generator of pseudorandom signals inserted between said signal-generating means and said first filter means for subjecting at least one of two parameters of said periodic waveform, respectively representing the amplitude and the recurrence period thereof, to pseudorandom variations.
References Cited (Backward Citations)
US3549807A
Cited
US3909533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |