Shin-ichi Itou

Title: Shin-ichi Itou and His Telephone Line Battery Feed Circuit.

Introduction

Shin-ichi Itou is an inventor associated with Fujitsu Corporation in Tokyo, Japan. His patent work includes a circuit designed to provide power to a telephone subscriber line while reducing circuit size and power consumption.

Latest Patents

The supplied information lists one patent for Itou: “Battery Feed Circuit for Telephone Subscriber Line.” The invention uses an integrated circuit instead of a transformer and combines operational amplifiers, output resistors, feedback loops, and a switching power supply. The switching supply adjusts the first amplifier’s power-source voltage according to the subscriber-line loop length and the telephone set’s status. The design also reduces power loss by using smaller output resistances, a lower DC bias for the second amplifier, and a reduced supply voltage for the first amplifier. The patent record provided identifies 1 patent.

Career Highlights

Itou’s listed invention addresses miniaturization and energy efficiency in telephone-line battery feed circuits. Its approach integrates voltage control and feedback functions to adapt circuit operation to line conditions.

Collaborations

The supplied information names Toshiro Tojo and Kenji Takatou as Itou’s coworkers. No further details about their roles in the patent or their collaboration are provided.

Conclusion

Shin-ichi Itou’s listed patent presents a compact, transformer-free telephone subscriber-line circuit designed to reduce power consumption while adapting to operating conditions.