Issued Patents All Time
Showing 1–25 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8761003 | Digital transmission method and digital transmission system | — | 2014-06-24 |
| 7464133 | Server/client system | Takami Kasasaku | 2008-12-09 |
| 7099625 | Automobile communications method and system | — | 2006-08-29 |
| 6285858 | Electronic toll collection system and method featuring antenna arrangement | — | 2001-09-04 |
| 6269302 | Simple mobile object position detecting system | — | 2001-07-31 |
| 5134634 | Multilevel quadrature amplitude demodulator capable of compensating for a quadrature phase deviation of a carrier signal pair | — | 1992-07-28 |
| 4975927 | Demodulator with composite transversal equalizer and eye detection clock synchronizer | — | 1990-12-04 |
| 4965536 | Quadrature amplitude modulation system using digital filters | — | 1990-10-23 |
| 4875049 | Automatic level control circuit for an ad convertor | — | 1989-10-17 |
| 4823361 | Interference immune digital modulation receiver | — | 1989-04-18 |
| 4823363 | Phase-locked clock regeneration circuit for digital transmission systems | — | 1989-04-18 |
| 4799240 | Clock synchronizing circuit including a voltage controlled oscillator | — | 1989-01-17 |
| 4757266 | Demodulation system capable of establishing synchronization in a transient state | Masato Tahara, Manabu Yagi, Toru Matsuura | 1988-07-12 |
| 4755763 | Demodulator capable of avoiding abnormal demodulation | — | 1988-07-05 |
| 4751478 | Multilevel modulator capable of producing a composite modulated signal comprising a quadrature amplitude modulated component and a phase modulated component | — | 1988-06-14 |
| 4750191 | D/A converter capable of producing an analog signal having levels of a preselected number different from 2.sup.N and communication network comprising the D/A converter | — | 1988-06-07 |
| 4721928 | Multilevel modulator capable of producing a multilevel quadrature amplitude modulated signal having (2.sup.n +.alpha.) output signal points | — | 1988-01-26 |
| 4703282 | Digital demodulation system | — | 1987-10-27 |
| 4631488 | QAM demodulator with distortion compensation | — | 1986-12-23 |
| 4620159 | Demodulator for multiphase PSK or multilevel QAM signals | Manabu Yagi | 1986-10-28 |
| 4574246 | Demodulator with AGC circuit for multi-level quadrature amplitude-modulated carrier wave | — | 1986-03-04 |
| 4553102 | Multilevel amplitude modulation demodulator with DC drift compensation | — | 1985-11-12 |
| 4549142 | Phase demodulator including variable phase shifter for controlling reference carrier | — | 1985-10-22 |
| 4544894 | DC Voltage control circuits | — | 1985-10-01 |
| 4528512 | Timing synchronizing circuit for demodulators | — | 1985-07-09 |