Issued Patents All Time
Showing 25 most recent of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5734790 | Low bit rate speech signal transmitting system using an analyzer and synthesizer with calculation reduction | — | 1998-03-31 |
| 5696874 | Multipulse processing with freedom given to multipulse positions of a speech signal | — | 1997-12-09 |
| 5557705 | Low bit rate speech signal transmitting system using an analyzer and synthesizer | — | 1996-09-17 |
| 5504832 | Reduction of phase information in coding of speech | — | 1996-04-02 |
| 5463716 | Formant extraction on the basis of LPC information developed for individual partial bandwidths | — | 1995-10-31 |
| 5339054 | Modulated signal transmission system compensated for nonlinear and linear distortion | — | 1994-08-16 |
| 5226083 | Communication apparatus for speech signal | — | 1993-07-06 |
| 5202953 | Multi-pulse type coding system with correlation calculation by backward-filtering operation for multi-pulse searching | — | 1993-04-13 |
| 5062102 | Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients | — | 1991-10-29 |
| 5056143 | Speech processing system | — | 1991-10-08 |
| 5048088 | Linear predictive speech analysis-synthesis apparatus | — | 1991-09-10 |
| 5027404 | Pattern matching vocoder | — | 1991-06-25 |
| 4991215 | Multi-pulse coding apparatus with a reduced bit rate | — | 1991-02-05 |
| 4975955 | Pattern matching vocoder using LSP parameters | — | 1990-12-04 |
| 4937868 | Speech analysis-synthesis system using sinusoidal waves | — | 1990-06-26 |
| 4914702 | Formant pattern matching vocoder | — | 1990-04-03 |
| 4908863 | Multi-pulse coding system | Shigeji Ikeda | 1990-03-13 |
| 4903303 | Multi-pulse type encoder having a low transmission rate | — | 1990-02-20 |
| 4881267 | Encoder of a multi-pulse type capable of optimizing the number of excitation pulses and quantization level | — | 1989-11-14 |
| 4852172 | Speech recognition system | — | 1989-07-25 |
| 4817141 | Confidential communication system | — | 1989-03-28 |
| 4815135 | Speech signal processor | — | 1989-03-21 |
| 4769847 | Noise canceling apparatus | — | 1988-09-06 |
| 4723294 | Noise canceling system | — | 1988-02-02 |
| 4720865 | Multi-pulse type vocoder | — | 1988-01-19 |