US5450522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auditory model for parametrization of speech
Assignee: Qwest Communications International Inc
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Filing: 1991-08-19
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Granted: 1995-09-12
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Expires: 2011-08-19
Abstract
Abstract A method and system are provided for alleviating the harmful effects of convolutional distortions of speech, such as the effect of a telecommunication channel, on the performance of an automatic speech recognizer (ASR). The technique is based on the filtering of time trajectories of an auditory-like spectrum derived from the Perceptual Linear Predictive (PLP) method of speech parameter estimation.
Inventors
- 👤 Hynek Hermansky
- 👤 Nelson H. Morgan
- 👤 Philip D. Kohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:52
CPC Classifications
G; G10; G10L; G10L21/00; G10L21/02; G10L21/0208
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
57 words
In a speech processing system including means for computing a plurality of temporal speech parameters including short-term parameters having time trajectories, a method for alleviating the harmful effects of distortions of speech, the method comprising: filtering data representing time trajectories of the short-term parameters of speech so as to minimize distortions due to steady-state factors in speech.
Claim 2
Dependent Claim
57 words
In a speech processing system including means for computing a plurality of temporal speech parameters including short-term parameters having time trajectories, a method for alleviating the harmful effects of distortions of speech, the method comprising: filtering data representing time trajectories of the short-term parameters of speech so as to minimize distortions due to steady-state factors in speech.
Claim 3
Dependent Claim
16 words
The method as claimed in claim 1 wherein the short-term parameters of speech are spectral parameters.
Claim 4
Dependent Claim
34 words
The method as claimed in claim 2 wherein the step of filtering includes the step of bandpass filtering to simultaneously smooth the data and remove the influence of slow variations in the spectral parameters.
Claim 5
Dependent Claim
17 words
The method as claimed in claim 3 wherein the spectral parameters are parameters of an auditory-like spectrum.
Claim 6
Dependent Claim
39 words
The method as claimed in claim 4 further comprising the steps of taking the logarithm of the auditory-like spectrum to obtain a spectrum-like pattern and taking the inverse logarithm of the spectrum-like pattern after the step of band-pass filtering.
Claim 7
Dependent Claim
33 words
The method as claimed in claim 4 further comprising the step of approximating the band-pass filtered auditory-like spectrum by a spectrum of an autoregressive model using an autocorrelation method of linear predictive analysis.
Claim 8
Dependent Claim
66 words
A speech processing system including means for computing a plurality of temporal speech parameters. including short-term parameters having time trajectories, the system being useful for alleviating the harmful effects of steady-state distortions of speech, the system further comprising: means for filtering the time trajectories of the short-term parameters of speech to obtain a temporal pattern in which distortions due to steady-state factors in speech are minimized.
Claim 9
Dependent Claim
66 words
A speech processing system including means for computing a plurality of temporal speech parameters. including short-term parameters having time trajectories, the system being useful for alleviating the harmful effects of steady-state distortions of speech, the system further comprising: means for filtering the time trajectories of the short-term parameters of speech to obtain a temporal pattern in which distortions due to steady-state factors in speech are minimized.
Claim 10
Dependent Claim
14 words
The system as claimed in claim 7 wherein the short-term parameters are spectral parameters.
Claim 11
Dependent Claim
17 words
The system as claimed in claim 8 wherein the spectral parameters are parameters of an auditory-like spectrum.
Claim 12
Dependent Claim
34 words
The system as claimed in claim 9 further comprising means for taking the logarithm of the auditory-like spectrum to obtain a spectrum-like pattern and means for taking the inverse logarithm of the spectrum-like pattern.
Claim 13
Dependent Claim
32 words
The system as claimed in claim 9 further comprising means for approximating the band-pass filtered auditory-like spectrum by a spectrum of an autoregressive model using an autocorrelation method of linear predictive analysis.
Claim 14
Dependent Claim
18 words
The system of claimed in claim 7 wherein the means for filtering is accomplished by a bandpass filter.
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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) | 1998-09-11 | 1999-03-13 | 1999-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-11 | 2003-03-13 | 2003-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-11 | 2007-03-13 | 2007-09-12 | $7700.00 | Window Closed / Lapsed |