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For the Inventor, By the Inventor

Kawasaki, Japan

Yasuji Ohta

USPTO Granted Patents = 12


Average Co-Inventor Count = 5.2

ph-index = 9

Forward Citations = 294(Granted Patents)


Location History:

  • Yokohama, JP (1992 - 1993)
  • Kawasaki, JP (1991 - 1999)

Company Filing History:

goldMedal12 out of 39,228 
 
Fujitsu Corporation
 patents

Years Active: 1991-1999

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12 patents (USPTO):Explore Patents
1. 5864650 - Speech encoding method and apparatus using tree-structure delta code book (1999-01-26),
2. 5828811 - Speech signal coding system wherein non-periodic component feedback to (1998-10-27),
3. 5323486 - Speech coding system having codebook storing differential vectors (1994-06-21),
4. 5263119 - Gain-shape vector quantization method and apparatus (1993-11-16),
5. 5261027 - Code excited linear prediction speech coding system (1993-11-09),
6. 5231692 - Pitch period searching method and circuit for speech codec (1993-07-27),
7. 5224167 - Speech coding apparatus using multimode coding (1993-06-29),
8. 5199076 - Speech coding and decoding system (1993-03-30),
9. 5151968 - Vector quantization encoder and vector quantization decoder (1992-09-29),
10. 5115469 - Speech encoding/decoding apparatus having selected encoders (1992-05-19),
11. 5086471 - Gain-shape vector quantization apparatus (1992-02-04),
12. 5003604 - Voice coding apparatus (1991-03-26),

Title: Yasuji Ohta: Innovator in Speech Encoding Technologies

Introduction

Yasuji Ohta is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of speech encoding, holding a total of 12 patents. His innovative work has advanced the technology used in speech signal processing.

Latest Patents

Among his latest patents is a speech encoding method and apparatus that utilizes a tree-structure delta code book. This method involves multiplying a larger number of delta vectors by a matrix of a linear predictive synthesis filter. The power of these delta vectors is evaluated, and they are reordered in decreasing order of power. This process allows for the selection of delta vectors that improve quantization characteristics and achieve variable rate encoding. Another notable patent involves a speech signal coding system that synthesizes periodic and non-periodic excitation signals to minimize the difference between the regenerated signal and the input speech signal. This innovative approach enhances the quality of speech synthesis.

Career Highlights

Yasuji Ohta is currently associated with Fujitsu Corporation, where he continues to develop cutting-edge technologies in speech processing. His work has been instrumental in shaping modern speech encoding techniques.

Collaborations

He has collaborated with notable coworkers such as Tomohiko Taniguchi and Yoshinori Tanaka, contributing to various advancements in the field.

Conclusion

Yasuji Ohta's contributions to speech encoding technologies have significantly impacted the industry. His innovative patents and ongoing work at Fujitsu Corporation highlight his role as a leading inventor in this field.

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