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Title: US6035271: Statistical methods and apparatus for pitch extraction in speech recognition, synthesis and regeneration
[ Derwent Title ]

Country: US United States of America

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16 pages

Inventor: Chen, Chengjun Julian; White Plains, NY

Assignee: International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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Published / Filed: 2000-03-07 / 1997-10-31

Application Number: US1997000961733

IPC Code: Advanced: G10L 11/04; G10L 15/10; G10L 15/14; G10L 15/18;
IPC-7: G10L 3/00;

ECLA Code: G10L25/90; G10L15/14M; S10L25/06; S10L25/15; S10L25/90;

U.S. Class: Current: 704/207; 704/216; 704/217; 704/E11.006; 704/E15.028;
Original: 704/207; 704/217; 704/216;

Field of Search: 704/207,216,217,218,237,263

Priority Number:
1997-10-31  US1997000961733
1995-03-15  US1995000404786

Abstract:     A method and apparatus for extracting pitch value information from speech. The method selects at least three highest peaks from a normalized autocorrelation function and produces a plurality of frequency candidates for pitch value determination. The plurality of frequency candidates are used to identify anchor points in pitch values, and is further used to perform both forward and backward searching when an anchor point cannot be readily identified. The running mean or average of determined pitch values is maintained and used in conjunction with the identified valid pitch values in a final determination of the pitch estimation using a weighted least squares fit for identified non-valid frames.

Attorney, Agent or Firm: F. Chau & Associates, LLP ;

Primary / Asst. Examiners: Hudspeth, David R.; Azad, Abul K.

Maintenance Status: E1 Expired  Check current status

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1995000404786 1995-03-15       

Parent Case:

    This application is a Continuation-in-Part of U.S. patent application Ser. No. 08/404,786 filed on March 15, 1995, the entire disclosure of which is incorporated herein by reference.

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First Claim:
Show all 11 claims
What is claimed is:     1. A method for pitch extraction in speech recognition, synthesis and regeneration comprising the steps of:
  • performing autocorrelation of a digitized speech input to produce an autocorrelation function;
  • selecting at least the three highest peaks from the autocorrelation function;
  • calculating top ranked frequencies for the at least three highest peaks;
  • determining a plurality of frequency candidates from the calculated frequencies;
  • identifying valid and non-valid frames of the input speech;
  • determining pitch values for each frame of the received input speech using the positions of the selected peaks and an energy value representing the instantaneous voice energy;
  • maintaining a running average of determined pitch values; and
  • performing a weighted dynamic least squares fit of the identified valid and non-valid frames to estimate the pitch value using a least squares fit to a cubic function.

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Forward References: Show 18 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (18)   |   Backward references (5)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 13pp US3069507  1962-12 David   Autocorrelation vocoder
Get PDF - 19pp US4461024  1984-07 Rengger et al.  The Secretary of State for Industry in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland Input device for computer speech recognition system
Get PDF - 17pp US4561102  1985-12 Prezas  AT&T Bell Laboratories Pitch detector for speech analysis
Get PDF - 13pp US4653098  1987-03 Nakata et al.  Hitachi, Ltd. Method and apparatus for extracting speech pitch
Get PDF - 12pp US5353372  1994-10 Cook et al.  The Board of Trustees of the Leland Stanford Junior University Accurate pitch measurement and tracking system and method
Foreign References: None

Other Abstract Info: DERABS G1996-510000 DERABS G2000-237101 DERABS G2000-237101

Other References:
  • Sadaoki Furui, (Digital Speech Processing, Synthesis, and Recognition), pp. 103-109, Jan. 1989.
  • Man Mohan Sondhi, IEEE transactions on audio and electroacoustics, vol. AU-16, No. 2, pp. 262-266, Jul. 1968.

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