US5127054A
Expired / Lapsed
US
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Speech quality improvement for voice coders and synthesizers
Assignee: Motorola Solutions Inc
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Filing: 1990-10-22
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Granted: 1992-06-30
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Expires: 2010-10-22
Abstract
Abstract A harmonic signal is created from a limited spectral representation of a voice signal. The harmonic signal is combined with the at least a portion of the limited delayed spectral signal to provide a reconstructed speech signal having perceptually improved audio quality.
Inventors
- 👤 Daehyoung Hong
- 👤 Michael D. Kotzin
- 👤 Anthony P. van den Heuvel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:24
CPC Classifications
G; G10; G10L; G10L21/00; G10L21/02; G10L21/038; H; H04; H04B; H04B1/00; H04B1/66; H04B1/667
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A method for generating a reconstructed information signal, comprising the steps of: combining outputs of a plurality of sub-band filters to produce a limited spectral signal; generating a harmonic signal by applying said limited spectral signal to a non-linear device; delaying said limited spectral signal; processing said harmonic signal to provide a processed harmonic signal that is at least partially related to said harmonic signal; and combining said delayed limited spectral signal with said processed harmonic signal, generating the reconstructed information signal.
Claim 2
Independent Claim
82 words
A method for generating a reconstructed information signal, comprising the steps of: combining outputs of a plurality of sub-band filters to produce a limited spectral signal; generating a harmonic signal by applying said limited spectral signal to a non-linear device; delaying said limited spectral signal; processing said harmonic signal to provide a processed harmonic signal that is at least partially related to said harmonic signal; and combining said delayed limited spectral signal with said processed harmonic signal, generating the reconstructed information signal.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein said processing step comprises the step of sub-band filtering said harmonic signal.
Claim 4
Dependent Claim
21 words
The method of claim 2, further comprising the step of adjusting said sub-band filtered harmonic signal to provide spectral amplitude weighting.
Claim 5
Dependent Claim
23 words
The method of claim 2, wherein the sub-band filtering is performed with different sub-bands than the sub-band filters producing said limited spectral signal.
Claim 6
Independent Claim
113 words
An apparatus for generating a reconstructed information signal, comprising: means for combining outputs of a plurality of sub-band filters to produce a limited spectral signal; means, coupled to said means for combining, for generating a harmonic signal by applying said limited spectral signal to a non-linear device; means, coupled to said means for combining, for delaying said limited spectral signal; means, coupled to said means for generating, for processing said harmonic signal to provide a processed harmonic signal that is at least partially related to said harmonic signal; and means, coupled to said means for delaying, for combining said delayed limited spectral signal with said processed harmonic signal, generating the reconstructed information signal.
Claim 7
Independent Claim
113 words
An apparatus for generating a reconstructed information signal, comprising: means for combining outputs of a plurality of sub-band filters to produce a limited spectral signal; means, coupled to said means for combining, for generating a harmonic signal by applying said limited spectral signal to a non-linear device; means, coupled to said means for combining, for delaying said limited spectral signal; means, coupled to said means for generating, for processing said harmonic signal to provide a processed harmonic signal that is at least partially related to said harmonic signal; and means, coupled to said means for delaying, for combining said delayed limited spectral signal with said processed harmonic signal, generating the reconstructed information signal.
Claim 8
Dependent Claim
13 words
The apparatus of claim 5, wherein said non-linear device comprises a full-wave rectifier.
Claim 9
Dependent Claim
18 words
The apparatus of claim 5, wherein said means for processing comprises means for sub-band filtering said harmonic signal.
Claim 10
Dependent Claim
27 words
The apparatus of claim 7, further comprising means, coupled to said means for sub-band filtering, for adjusting said sub-band filtered harmonic signal to provide spectral amplitude weighting.
Claim 11
Dependent Claim
21 words
The apparatus of claim 7, wherein the sub-band filters use different sub-bands than the sub-band filters producing said limited spectral signal.
Claim 12
Independent Claim
78 words
A method for generating a reconstructed information signal, comprising the steps of: combining outputs of a plurality of sub-band filters to produce a limited spectral signal; generating a harmonic signal by applying said limited spectral signal to a non-linear device; sub-band filtering said harmonic signal; adjusting said sub-band filtered harmonic signal to provide spectral amplitude weighting; delaying said limited spectral signal; and combining said delayed limited spectral signal with said adjusted harmonic signal, generating the reconstructed information signal.
Claim 13
Independent Claim
78 words
A method for generating a reconstructed information signal, comprising the steps of: combining outputs of a plurality of sub-band filters to produce a limited spectral signal; generating a harmonic signal by applying said limited spectral signal to a non-linear device; sub-band filtering said harmonic signal; adjusting said sub-band filtered harmonic signal to provide spectral amplitude weighting; delaying said limited spectral signal; and combining said delayed limited spectral signal with said adjusted harmonic signal, generating the reconstructed information signal.
Claim 14
Dependent Claim
24 words
The method of claim 10, wherein the sub-band filtering is performed with different sub-bands than the sub-bands used to produce said limited spectral signal.
Claim 15
Independent Claim
118 words
An apparatus for generating a reconstructed information signal, comprising: means for combining outputs of a plurality of sub-band filters to produce a limited spectral signal; means, coupled to said means for combining, for generating a harmonic signal by applying said limited spectral signal to a non-linear device; means, coupled to said means for generating, for sub-band filtering said harmonic signal; means, coupled to said means for sub-band filtering, for adjusting said sub-band filtered harmonic signal to provide spectral amplitude weighting; means, coupled to said means for combining, for delaying said limited spectral signal; and means, coupled to said means for delaying, for combining said delayed limited spectral signal with said adjusted harmonic signal, generating the reconstructed information signal.
Claim 16
Independent Claim
118 words
An apparatus for generating a reconstructed information signal, comprising: means for combining outputs of a plurality of sub-band filters to produce a limited spectral signal; means, coupled to said means for combining, for generating a harmonic signal by applying said limited spectral signal to a non-linear device; means, coupled to said means for generating, for sub-band filtering said harmonic signal; means, coupled to said means for sub-band filtering, for adjusting said sub-band filtered harmonic signal to provide spectral amplitude weighting; means, coupled to said means for combining, for delaying said limited spectral signal; and means, coupled to said means for delaying, for combining said delayed limited spectral signal with said adjusted harmonic signal, generating the reconstructed information signal.
Claim 17
Dependent Claim
21 words
The apparatus of claim 12, wherein the sub-band filters use different sub-bands than the sub-band filters producing said limited spectral signal.
Claim 18
Dependent Claim
13 words
The apparatus of claim 12, wherein said non-linear device comprises a full-wave rectifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |