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Title: US4924508: Pitch detection for use in a predictive speech coder
[ Derwent Title ]


Country: US United States of America

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17 pages

 
Inventor: Crepy, Hubert; Paris, France
Elie, Philippe; La Gaude, France
Galand, Claude; Cagnes sur Mer, France
Lancon, Emmanuel; Nice, France
Liethoudt, Thierry; Nice, France
Rosso, Michele; Nice, France

Assignee: International Business Machines, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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Published / Filed: 1990-05-08 / 1988-02-12

Application Number: US1988000155459

IPC Code: Advanced: G01H 3/04; G10L 19/08;
IPC-7: G10L 7/02; G10L 9/08;

ECLA Code: G10L19/08; G10L25/90;

U.S. Class: Current: 704/207; 704/219; 704/E11.006; 704/E19.026;
Original: 381/038; 381/049;

Field of Search: 381/036-41,29-32,49 375/025,122 364/513.5

Priority Number:
1987-05-03  FR1987000430006

Abstract: A pitch detector to adjust long term prediction in a pulse excitation speech coder. A residual signal r(n) is first derived from the speech signal s(n) by short term filtering. Then, r(n) is processed to calculate a prediction error signal e(n) which is subsequently pulse excitation encoded. The processing of e(n) entails prediction of a residual by measuring a pitch related factor M, employing two steps. First calculating a coarse M value through peak clipping and sign transition detection, and then adjusting the M value by autocorrelation--calculations about the roughly spaced peaks.

Attorney, Agent or Firm: Stephens, L. Keith ;

Primary / Asst. Examiners: Clark, David L.; Merecki, John A.

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Designated Country: BE CH DE ES FR GB IT LI NL SE 

Family: Show 8 known family members

First Claim:
Show all 12 claims
We claim:     1. Method for detecting related data (M) in a representative signal split into blocks of samples including a rough M determination followed by a fine M determination, said method comprising the steps of:
  • a. for said rough M determination:
    • 1. setting a positive threshold (Th+) and a negative threshold (Th-) based on characteristics of the representative signal;
    • 2. locating and storing a plurality of samples representative of said blocks of samples, having magnitudes above and below said Th+ and Th- ;
    • 3. Identifying significant signal magnitude transitions within said blocks of samples;
    • 4. storing a set of values M' indicative of said samples between each of said significant signal magnitude transitions; and
    • 5. averaging said set of values M' to calculate said rough M determination; and
  • b. for said fine M determination:
    • 1. setting a plurality of autocorrelation zones about said plurality of samples;
    • 2. splitting said blocks of samples into consecutive sub-blocks of samples;
    • 3. autocorrelating, using the autocorrelation zones of a current sub-block of samples; and
    • 4. setting the fine M value equal to a maximum value for said current sub-block of samples in accordance with step 3 of said fine M determination.


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Forward References: Show 23 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (23)   |   Backward references (5)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 5pp US3573612  1971-04 Scarr  Standard Telephones and Cables Limited APPARATUS FOR ANALYZING COMPLEX WAVEFORMS CONTAINING PITCH SYNCHRONOUS INFORMATION
Get PDF - 8pp US3916105  1975-10 McCray  International Business Machines Corporation Pitch peak detection using linear prediction
Get PDF - 34pp US4015088  1977-03 Dubnowski et al.  Bell Telephone Laboratories, Incorporated Real-time speech analyzer
Get PDF - 10pp US4516259  1985-05 Yato et al.  Kokusai Denshin Denwa Co., Ltd. Speech analysis-synthesis system
Get PDF - 18pp US4757517  1988-07 Yatsuzuka  Kokusai Denshin Denwa Kabushiki Kaisha System for transmitting voice signal
       
Foreign References:
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Publication Date IPC Code Assignee   Title
Buy PDF EP2150377A 1985-06  B24B 41/06 EGGER CHRISTIAN VIBRATION-FREE MACHINING OF PIERCERS 
Buy PDF FR2351467 1977-12  G10L 25/90 LICENTIA GMBH PROCEDE DE DETERMINATION DE LA PERIODE FONDAMENTALE D'UN SIGNAL VOCAL A L'AIDE DU SIGNAL DIFFERENTIEL DELIVRE PAR DES VOCODEURS PREDICTIFS. 


Other Abstract Info: DERABS G88-251467

Other References:
  • Yun et al., "Piecewise Linear Quantization of LPC Reflection Coefficients", IEEE ICASSP 77, 5/77, pp. 417-420.
  • Galand et al., "Voice Excited Predictive Coder", IBM J. Res. Develop., vol. 29, No. 2, Mar. 1985, pp. 147-157. (11 pages) Cited by 2 patents
  • Markel et al., "Linear Prediction of Speech", Springer Verlag 1976, pp. 94-95.
  • Kroon et al., "Regular Pulse Excitation", IEEE Trans. ASSP, vol. ASSP-34, No. 5, 10/86, pp. 1054-1059. (10 pages) Cited by 7 patents
  • J. Le Roux et al., "A Fixed Point Computation of Partial Correlation Coefficients", IEEE Trans. ASSP, vol. ASSP-25, No. 3 6/77, pp. 257-259.


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