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Title: US5093863: Fast pitch tracking process for LTP-based speech coders
[ Derwent Title ]


Country: US United States of America

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Inventor: Galand, Claude; Cagnes Sur Mer, France
Rosso, Michele; Nice, France

Assignee: International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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Published / Filed: 1992-03-03 / 1990-04-06

Application Number: US1990000505732

IPC Code: Advanced: G10L 11/04; G10L 19/08;
IPC-7: G10L 5/00;

ECLA Code: G10L25/90; G10L19/09;

U.S. Class: Current: 704/207; 704/218; 704/E11.006; 704/E19.029;
Original: 381/038; 381/049;

Field of Search: 381/038,49

Priority Number:
1989-04-11  EP1989000480052

Abstract:     A process for deriving voice pitch related delay values M to tune a Long-Term Prediction (LTP) filter to be used in an LTP based speech coder converting a speech derived digital signal r(n) into a lower bit rate signal, said filter being provided with a variable length delay line y(n) fed with a reconstructed signal r'(n). The process includes splitting r(n) into segments and each segment into sub-segments; then cross-correlating the first current r(n) sub-segment with a previously reconstructed segment and sorting the cross-correlation values for peak location, whereby a first delay value M1 is derived and used to tune the filter. Then, said M1 is used to compute sample indexes n for a predefined number of samples located about M1/p, . . . , M1, 2M1, . . . , pM1 and repeating cross-correlation and sorting operations to derive M2 and so on up to a full segment length (e.g. 160 samples). Then the process is started all over again.

Attorney, Agent or Firm: Cockburn, Joscelyn G. ;

Primary / Asst. Examiners: Kemeny, Emanuel S.;

Maintenance Status: E3 Expired  Check current status

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Designated Country: DE FR GB 

Family: Show 7 known family members

First Claim:
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We claim:     1. A process for deriving voice pitch related delay values M to tune a Long-Term Prediction (LTP) filter to be used in an LTP-based speech coder converting a speech derived digital signal r(n) into a lower bit rate signal, said filter being provided with a variable length delay line fed with a reconstructed signal r'(n), and said process including:
  • a) splitting said r(n) signal into N samples long consecutive segments;
  • b) splitting each segment into j sub-segments, j being a preselected integer;
  • c) cross-correlating the first current signal sub-segment with a previously reconstructed signal segment to derive therefrom a cross-correlation function R(n), wherein: [Figure] for n=k' to N d) sorting the R(n) values for peak location R(M1), setting the filter delay to M1 and shifting the signals samples over one sub-segment;
  • e) computing samples indexes n for a predefined number of samples located about M1 harmonics and sub-harmonics, i.e. located about M1/p, . . . , M1/3, M1/2, M1, 2M1, 3M1, . . . , pM1 wherein p is a predefined integer value and n=pM1+k where k is a predefined integer value;
  • f) computing the cross-correlation function values R(n) for n defined in step (e);
  • g) sorting the R(n) values for peak location to derive a new delay value M2;
  • h) repeating steps (e) through (g) using M2 instead of M1, and so on up to Mj.


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Forward References: Show 13 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (13)   |   Backward references (2)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 18pp US5001758  1991-03 Galand et al.  International Business Machines Corporation Voice coding process and device for implementing said process
Get PDF - 16pp US5012517  1991-04 Wilson et al.  Pacific Communication Science, Inc. Adaptive transform coder having long term predictor
       
Foreign References: None

Other Abstract Info: DERABS G90-313919

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