Location History:
- Hamamatsu, JP (2005 - 2009)
- Shizuoka, JP (2008 - 2011)
Company Filing History:
Years Active: 2005-2011
Title: Innovations by Toru Hirai
Introduction
Toru Hirai is a notable inventor based in Shizuoka, Japan. He has made significant contributions to the field of sound technology, particularly in echo cancellation and sound transfer methods. With a total of 6 patents to his name, Hirai's work has had a profound impact on audio engineering.
Latest Patents
Hirai's latest patents include a multi-channel echo cancel method, a multi-channel sound transfer method, a stereo echo canceller, a stereo sound transfer apparatus, and a transfer function calculation apparatus. These innovations focus on reproducing stereo sound signals directly from loudspeakers (SP(L), SP(R)). By utilizing a sum signal and a difference signal of the stereo sound signals as a reference, he performs cross spectrum calculations with microphone-collected sound signals. This process allows for the calculation of transfer functions for four sound transfer systems between the loudspeakers and microphones (MC(L), MC(R)). The obtained transfer functions undergo inverse Fourier transformation to derive impulse responses, which are then used in filter means to create echo cancel signals, effectively addressing the challenges associated with indefinite coefficients in multi-channel sound signal echo cancellation.
Career Highlights
Hirai is currently employed at Yamaha Corporation, a leading company in the audio and music industry. His work at Yamaha has allowed him to explore and develop innovative sound technologies that enhance audio experiences for users worldwide.
Collaborations
Throughout his career, Hirai has collaborated with talented individuals such as Mikio Tohyama and Yoshikazu Honji. These collaborations have contributed to the advancement of sound technology and the successful development of his patented inventions.
Conclusion
Toru Hirai's contributions to sound technology through his innovative patents have significantly advanced the field of audio engineering. His work continues to influence the way we experience sound today.