Company Filing History:

27 out of 42,485

Hitachi, Ltd.

patents

11 out of 208

Hitachi Denshi Kabushiki Kaisha

patents

3 out of 1,257

Hitachi-kokusai Electric Inc.

where one patent can have more than one assignee

Years Active: 1980-2006

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40 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7016298 - Signal transmission/reception system of orthogonal frequency division multiplexing (2006-03-21),

2. 6965650 - Digital modulation type signal transmission apparatus and method of displaying received signal in the signal transmission apparatus (2005-11-15),

3. 6907026 - Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type (2005-06-14),

4. 6813326 - Data transmission system, data transmission communication station, and data transmission method (2004-11-02),

5. 6611493 - Communication, transmission and receiving method and apparatus using orthogonal frequency division multiplexing modulation system (2003-08-26),

6. 6512798 - Digital communication system of orthogonal modulation type (2003-01-28),

7. 6473466 - Data transmitting method and data transmitting apparatus accompanied with a plurality of transmitting of receiving antennas (2002-10-29),

8. 6381251 - Data transmission apparatus and receiving apparatus using orthogonal frequency division multiplex modulation system (2002-04-30),

9. 6381236 - Bi-directional digital transmission system and bi-directional digital transmission method (2002-04-30),

10. 6304611 - OFDM modulator and OFDM modulation method for digital modulated wave having guard interval (2001-10-16),

11. 6246735 - Synchronization detection method for data transmission apparatus and data transmission apparatus using the same (2001-06-12),

12. 6046629 - Method of an apparatus for demodulating amplitude-modulated signals in (2000-04-04),

13. 6038249 - Spectrum spread transmission method and apparatus (2000-03-14),

14. 5282045 - Depth-of-field control apparatus and image pickup apparatus having the (1994-01-25),

15. 5257326 - Method and apparatus for interpolating a video signal of a picture (1993-10-26),

Title: Toshiyuki Akiyama: A Pioneer in Signal Transmission Technologies

Introduction

Toshiyuki Akiyama is a prominent inventor from Tokorozawa, Japan, known for his innovative contributions to signal transmission technologies. With an impressive portfolio of 40 patents, he has significantly advanced the fields of communication and digital modulation.

Latest Patents

Akiyama's recent work includes groundbreaking patents that focus on orthogonal frequency division multiplexing (OFDM) systems. One of his notable inventions is a signal transmission/reception system that features a transmission apparatus capable of multiplexing multiple orthogonal carriers to efficiently transmit modulated signals. This apparatus incorporates two modulators, each utilizing different modulation schemes, and a distributing circuit that allocates coded signals to various carriers within a defined frequency band.

Another significant patent introduced a digital modulation type signal transmission apparatus, which leverages an I-Q complex plane to assign information codes to specific signal points. This system effectively transmits and demodulates signals, ensuring a precise reproduction of the original information codes.

Career Highlights

Throughout his career, Akiyama has contributed his expertise to major companies, including Hitachi, Ltd. and Hitachi Denshi Kabushiki Kaisha. His work at these reputable organizations has provided a solid foundation for his innovative pursuits in electronics and telecommunications.

Collaborations

Akiyama has collaborated with notable colleagues in the industry, including Naoki Ozawa and Kenji Takahashi. Through these partnerships, he has continued to push the boundaries of technology and foster innovation in signal processing.

Conclusion

Toshiyuki Akiyama's work exemplifies the transformative power of innovation in the tech industry. His extensive patent portfolio reflects a commitment to advancing the field of signal transmission, which has had a lasting impact on communication technologies. As he continues to develop new solutions, Akiyama remains an influential figure in the realm of telecommunications.

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