Tetsu Koyama

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Echo canceller for two-wire full duplex digital data transmission
- Patent number 5,388,092
- Issue date Feb 7, 1995
- NEC Corporation
- Tetsu Koyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Echo canceler
- Patent number 5,353,279
- Issue date Oct 4, 1994
- NEC Corporation
- Tetsu Koyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Echo canceller system suitable for a 2B1Q transmission code
- Patent number 5,249,179
- Issue date Sep 28, 1993
- NEC Corporation
- Tetsu Koyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
DC termination circuit for subscriber cables
- Patent number 4,984,250
- Issue date Jan 8, 1991
- NEC Corporation
- Tetsu Koyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
FSK with continuous phase and continuous slope at bit transitions
- Patent number 4,700,364
- Issue date Oct 13, 1987
- NEC Corporation
- Tomohiro Miyazaki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE