US5142584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speech coding/decoding method having an excitation signal
Assignee: NEC Corp
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Filing: 1990-07-20
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Granted: 1992-08-25
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Expires: 2010-07-20
Abstract
Abstract A speech coding method in which spectrum parameter representing a spectrum envelope and a pitch parameter representing a pitch are obtained from an input discrete speech signal. A frame interval is divided into subintervals in accordance with the pitch parameter. A sound source signal in one of the subintervals is obtained by obtaining a multipulse with respect to a difference signal obtained by performing prediction on the basis of a past sound source signal. Correction information for correcting at least one of the amplitude and the phase of the sound source signal are obtained and output in other pitch intervals in the frame.
Inventors
- 👤 Kazunori Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:24
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/08; G10L19/10; G10L25/00; G10L25/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A speech coding method comprising the steps of: obtaining a linear prediction spectrum parameter representing a spectrum envelope for a short-time input discrete speech signal and a pitch parameter representing a pitch period from an input discrete speech signal; dividing a frame interval into subintervals in accordance with the pitch parameter; obtaining a sound source signal in one of the subintervals by obtaining a multipulse with respect to a difference signal obtained by performing prediction on the basis of a past sound source signal; obtaining correction information for correcting at least one of an amplitude and a phase of the sound source signal in other pitch intervals in the frame; and outputting the correction information, said linear prediction spectrum parameter and said pitch parameter.
Claim 2
Dependent Claim
124 words
A speech coding method comprising the steps of: obtaining a linear prediction spectrum parameter representing a spectrum envelope for a short-time input discrete speech signal and a pitch parameter representing a pitch period from an input discrete speech signal; dividing a frame interval into subintervals in accordance with the pitch parameter; obtaining a sound source signal in one of the subintervals by obtaining a multipulse with respect to a difference signal obtained by performing prediction on the basis of a past sound source signal; obtaining correction information for correcting at least one of an amplitude and a phase of the sound source signal in other pitch intervals in the frame; and outputting the correction information, said linear prediction spectrum parameter and said pitch parameter.
Claim 3
Dependent Claim
139 words
A speech coding method comprising the steps of: obtaining a linear prediction spectrum parameter representing a spectrum envelope for a short-time input discrete speech signal and a pitch parameter representing a pitch period from an input discrete speech signal; dividing a frame interval into subintervals in accordance with the pitch parameter; obtaining a sound source signal in one of the subintervals by selecting one type of sound source signal, with respect to a difference signal obtained by performing prediction on the basis of a past sound source signal, from a codebook in which sound source signal vectors are stored; obtaining correction information for correcting at least one of an amplitude and a phase of the sound source signal in other pitch intervals in the frame; and outputting the correction information, the linear prediction spectrum parameter and the pitch parameter.
Claim 4
Dependent Claim
139 words
A speech coding method comprising the steps of: obtaining a linear prediction spectrum parameter representing a spectrum envelope for a short-time input discrete speech signal and a pitch parameter representing a pitch period from an input discrete speech signal; dividing a frame interval into subintervals in accordance with the pitch parameter; obtaining a sound source signal in one of the subintervals by selecting one type of sound source signal, with respect to a difference signal obtained by performing prediction on the basis of a past sound source signal, from a codebook in which sound source signal vectors are stored; obtaining correction information for correcting at least one of an amplitude and a phase of the sound source signal in other pitch intervals in the frame; and outputting the correction information, the linear prediction spectrum parameter and the pitch parameter.
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |