Haruo Hamada

Title: Haruo Hamada - Innovator in Earphone Measurement Technology

Introduction

Haruo Hamada is a notable inventor based in Mitaka, Japan. He is recognized for his contributions to the field of audio technology, particularly in the measurement of earphone characteristics. His innovative approach has led to advancements that enhance the reliability and accuracy of earphone testing.

Latest Patents

Hamada holds a patent for an earphone characteristic measuring device. This device features an acoustic coupler designed to simulate an external auditory canal, allowing for precise insertion of the earphone under measurement. The device includes an acoustic tube of smaller diameter with an impedance of approximately 320 ohms, a sound source for emitting impulse sounds, and a microphone for capturing sound pressure information. The characteristic calculation circuit transforms the earphone characteristics from the acoustic coupler to those of a real ear, improving measurement reliability and facilitating the assessment of vent characteristics and insertion gain.

Career Highlights

Hamada is associated with Hitachi, Ltd., where he has made significant contributions to audio technology. His work has been instrumental in developing tools that enhance the understanding of earphone performance and user experience.

Collaborations

Hamada has collaborated with notable colleagues, including Kaoru Okabe and Makoto Kohashi. Their combined expertise has contributed to the advancement of audio measurement technologies.

Conclusion

Haruo Hamada's innovative work in earphone measurement technology exemplifies the impact of dedicated inventors in the field of audio engineering. His patent for the earphone characteristic measuring device represents a significant advancement in ensuring the quality and performance of audio devices.