EP0500094A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Speech signal coding and decoding system with transmission of allowed pitch range information
Assignee: Fujitsu Ltd
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Filing: 1992-02-20
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Granted: —
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Expires: 2012-02-20
Abstract
Abstract A speech signal coding apparatus inputs a pitch period generated by coding a speech signal, and outputs information on a range for said pitch period, together with the pitch period. A speech signal decoding apparatus inputs the pitch period and the above information on the range, and determines whether or not the pitch period is within the range. When the pitch period is determined to be within the range, the speech signal decoding apparatus outputs the above pitch period. When the pitch period is determined not to be within the range, the speech signal decoding apparatus outputs as a pitch period a predetermined value within the range. <IMAGE> <IMAGE>
Inventors
- 👤 Yoshinori c/o Fujitsu Limited Tanaka
- 👤 Yoshihiro c/o Fujitsu Limited Sadai
- 👤 Yasuko c/o Fujitsu Limited Shirai
- 👤 Tomohiko c/o Fujitsu Limited Taniguchi
- 👤 Hideaki c/o Fujitsu Limited Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:57
CPC Classifications
G; G10; G10L; G10L25/00; G10L25/90; G10L19/00; G10L19/04; G10L19/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A speech signal coding apparatus, comprising: speech signal coding means (1) for inputting a speech signal, and outputting code information by coding the speech signal, wherein the code information includes a pitch period obtained by a long term prediction; and range information generating means (2) for inputting said pitch period, and outputting information on an allowance range for said pitch period, wherein the allowance range contains said pitch period input thereto, and has a predetermined width.
Claim 2
Dependent Claim
46 words
A speech signal coding apparatus according to claim 1, wherein said allowance range includes a window containing a fundamental pitch period corresponding to said pitch period, and at least one additional window containing a pitch period equal to an integer multiple of said fundamental pitch period.
Claim 3
Dependent Claim
43 words
A speech signal coding apparatus according to claim 1, wherein said speech signal coding means (1) comprises means for determining whether or not said speech signal has no pitch periodicity, and for outputting information which indicates said speech signal has no pitch periodicity.
Claim 4
Dependent Claim
215 words
A speech signal decoding apparatus comprising: receiving means (4) for receiving code information by coding a speech signal, wherein the code information includes a pitch period obtained by a long term prediction, and information on an allowance range for said pitch period, wherein the allowance range contains said pitch period input thereto, and has a predetermined width; pitch period information examining means (5) for examining said pitch period to determine whether or not said pitch period is within the allowance range; pitch period correcting means (6) for generating and supplying to a speech signal regenerating means (7), a predetermined value within the allowance range, as a pitch period, instead of said pitch period received by the receiving means (4) when the pitch period received by the receiving means (4) is not within the allowance range, and supplying to said speech signal regenerating means (7), said pitch period received by said receiving means (4) when the pitch period received by the receiving means (4) is within the allowance range; and said speech signal regenerating means (7) for regenerating said speech signal by decoding said code information except that said pitch period supplied from said pitch period correcting means (6), instead of the pitch period received by the receiving means (4), is used in the decoding operation.
Claim 5
Dependent Claim
71 words
A speech signal decoding apparatus according to claim 4, wherein said code information contains no-pitch-period information indicating that said speech signal has no pitch periodicity, instead of the pitch period, when the speech signal has no pitch periodicity; said pitch period correcting means (6) supplies said no-pitch-period information to said speech signal regenerating means (7) when the no-pitch-period information is received by said receiving means (4) instead of the pitch period.
Claim 6
Dependent Claim
225 words
A speech signal decoding apparatus according to claim 4, further comprising: bit error detecting means (8) for detecting a bit error in said information on an allowance range, which is received by said receiving means (4); extrapolating means (9) for generating and outputting an allowance range by extrapolating from information on allowance ranges received preceding said information on the allowance range in which said error is detected, when said bit error detecting means (8) detects a bit error in said information on an allowance range; and selector means (10), controlled by the detection result of said bit error detecting means (8) for selecting and supplying the output of said extrapolating means (9) to said pitch period correcting means (6) instead of the information on the allowance range in which an error is detected, when said bit error detecting means (8) detects a bit error in said information on an allowance range, and selecting and supplying the information on the allowance range received by said receiving means (4), to said pitch period correcting means (6), when said bit error detecting means (8) does not detect a bit error in the information on the allowance range received by said receiving means (4); said pitch period information examining means (5) determines whether or not said pitch period is within the allowance range supplied from said selector means (10).
Claim 7
Dependent Claim
217 words
A speech signal decoding apparatus according to claim 4, further comprising: bit error detecting means (8) for detecting a bit error in said information on an allowance range, which is received by said receiving means (4); extrapolating means (9) for outputting information on allowance range received preceding said information on the allowance range in which said error is detected, when said bit error detecting means (8) detects a bit error in said information on the allowance range; and selector means (10), controlled by the detection result of said bit error detecting means (8) for selecting and supplying the output of said extrapolating means (9) to said pitch period correcting means (6) instead of the information on the allowance range in which an error is detected, when said bit error detecting means (8) detects a bit error in said information on the allowance range, and selecting and supplying the information on the allowance range received by said receiving means (4), to said pitch period correcting means (6), when said bit error detecting means (8) does not detect a bit error in the information on the allowance range received by said receiving means (4); said pitch period information examining means (5) determines whether or not said pitch period is within the allowance range supplied from said selector means (10).
References Cited (Backward Citations)
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