US4282406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive pitch detection system for voice signal
Assignee: KDDI Corp
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Filing: 1980-02-19
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Granted: 1981-08-04
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Expires: 2000-02-19
Abstract
Abstract A system for detecting the pitch of a voice signal, in which a plurality of pitch searching periods are determined so that pitch components of multiple relationship are not included in each of the pitch searching periods, and in which after detecting a pitch searching period including the pitch from the pitch searching periods, the pitch searching periods are adaptively shifted in a mannger to follow the change direction of the pitch predicted from the result of detection of the detected pitch.
Inventors
- 👤 Fumihiro Yato
- 👤 Seishi Kitayama
- 👤 Junso Tamura
- 👤 Hikoichi Ishigami
- 👤 Akira Kurematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:50
CPC Classifications
G; G10; G10L; G10L25/00; G10L25/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
An adaptive pitch detection system for detecting the pitch of a voice signal, comprising: input terminal means for receiving the voice signal; detection means connected to the input terminal means for detecting the pitch from one of a plurality of predetermined pitch searching periods, which are determined so that pitch components of multiple relationships are not included in each of the pitch searching periods; and control means connected to said detection means for adaptively shifting said one of the predetermined pitch searching periods so as to follow the change direction of the pitch predicted from the result of detection of the detected pitch.
Claim 2
Dependent Claim
103 words
An adaptive pitch detection system for detecting the pitch of a voice signal, comprising: input terminal means for receiving the voice signal; detection means connected to the input terminal means for detecting the pitch from one of a plurality of predetermined pitch searching periods, which are determined so that pitch components of multiple relationships are not included in each of the pitch searching periods; and control means connected to said detection means for adaptively shifting said one of the predetermined pitch searching periods so as to follow the change direction of the pitch predicted from the result of detection of the detected pitch.
Claim 3
Dependent Claim
44 words
An adaptive pitch detection system according to claim 1, in which said control means comprises means for shifting said one of the predetermined pitch searching periods in accordance with predetermined order before said pitch is detected from said one of predetermined pitch searching periods.
Claim 4
Dependent Claim
53 words
An adaptive pitch detection system according to claim 1, in which said control means comprises means for shifting said one of the predetermined pitch searching periods to the vicinity of said one of the predetermined pitch searching periods immediately after said pitch is not detected from said one of predetermined pitch searching periods.
Claim 5
Dependent Claim
49 words
An adaptive pitch detection system according to claim 3, in which said control means further comprises means for shifting said one of the predetermined pitch searching periods to an initial pitch searching period predetermined from said predetermined pitch searching periods when said pitch is not detected in the vicinity.
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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |