Company Filing History:

18 out of 1,057

Clarion Co

patents

4 out of 1,038

Nippon Electric Co., Ltd.

Nec Corporation and Clarion Co., Ltd.

patent

where one patent can have more than one assignee

Years Active: 1978-1991

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19 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5051703 - FM demodulator with tracking filter (1991-09-24),

2. 4899389 - Pulsating noise removal device (1990-02-06),

3. 4862097 - Pulsating noise removal device (1989-08-29),

4. 4701715 - Preceding value holding gate circuit for eliminating pulsive noises (1987-10-20),

5. 4694500 - Control voltage generating circuit for activating a noise reduction (1987-09-15),

6. 4682045 - Noise eliminating signal compensation circuit (1987-07-21),

7. 4680792 - Demodulator comprising an indicator circuit for use in common to (1987-07-14),

8. 4634902 - Circuit arrangement capable of adjusting a threshold level of a (1987-01-06),

9. 4612662 - Control circuit (1986-09-16),

10. 4331885 - Gate circuit (1982-05-25),

11. 4305042 - Circuit for compensating for discontinuity of a noise cancelled signal (1981-12-08),

12. 4301541 - Noise eliminating circuit (1981-11-17),

13. 4300104 - Automatic gain control circuit for a noise pulse canceller (1981-11-10),

14. 4297645 - Automatic gain control circuit comprising a circuit for comparing a (1981-10-27),

15. 4216430 - Noise eliminating circuit with automatic gain control (1980-08-05),

Title: Kiyoshi Amazawa: Innovations in Signal Processing Technologies

Introduction

Kiyoshi Amazawa is a prominent inventor based in Tokyo, Japan, known for his significant contributions to signal processing. With a remarkable portfolio that includes 19 patents, Amazawa has developed innovative technologies that advance the field of audio and frequency modulation.

Latest Patents

Among his latest patents, the “FM demodulator with tracking filter” stands out. This invention details an FM demodulating circuit utilizing a tracking filter, which enhances the precision of its operation by employing a tracking filter alongside an oscillator driven by a common control signal. Another significant invention is the “pulsating noise removal device.” This device features first and second variable attenuators that adjust the signal levels of both audio and noise components. Notably, it prevents inversion phenomena by effectively managing fluctuations in audio signal levels or frequencies.

Career Highlights

Throughout his career, Kiyoshi Amazawa has collaborated with renowned companies, including Clarion Co. and Nippon Electric Co., Ltd. His work has been instrumental in shaping the technologies that underpin modern audio and communication devices, reflecting his expertise and innovative spirit.

Collaborations

Amazawa has teamed up with fellow inventors such as Masaharu Mori and Kouichi Tanaka. These collaborations have fostered a collective creativity that has resulted in several patented technologies aimed at enhancing audio processing and noise reduction.

Conclusion

Kiyoshi Amazawa's contributions to the field of signal processing demonstrate his innovative mindset and dedication to technological advancement. His inventions continue to influence how audio signals are processed and utilized, solidifying his status as a leading inventor in Japan and beyond.

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