Ryoichi Matsuda

Title: Ryoichi Matsuda: Telephone Communication Inventions

Introduction

Ryoichi Matsuda is an inventor associated with Musashino, Japan. His recorded work includes 2 patents focused on telephone communication systems and improving speech transmission and reception. He worked at Nippon Telegraph and Telephone Public Corporation.

Latest Patents

Matsuda’s listed patents address different challenges in telephone design.

“Transmitting and Receiving Apparatus” describes a system that uses one reversible electro-acoustic converter as both transmitter and receiver, without requiring a press-to-talk switch. Two hybrid transformers connect the converter to the communication line and form the transmitting and receiving systems.

“Loudspeaking Telephone Circuit” uses speech signals to detect changes in acoustic coupling between a telephone’s loudspeaker and microphone, as well as changes in coupling between its transmitting and receiving circuits. The circuit adjusts the loss used to prevent howling in response to those changes. This approach aims to support clear speech with less signal loss than a conventional voice switch.

Career Highlights

Matsuda’s patent work reflects an interest in practical improvements to telephone communication. His inventions address hands-free transmission and reception, feedback prevention, and speech quality.

Collaborations

Matsuda’s listed coworkers include Kazuhiko Kakehi and Masaaki Terai.

Conclusion

Ryoichi Matsuda’s patents demonstrate his contributions to telephone circuitry, particularly in simplifying communication equipment and improving the quality of loudspeaker-based calls.