Kohji Ishida

This inventor holds 16 USPTO granted patents and 1 published patent application. Top assignee: Pioneer Electronic Corporation. Active years: 1981-1993.

USPTO Granted Patents = 16 (Patent Applications = 1)

% Patents Active = 100.0

Average Co-Inventor Count = 2.0

ph-index = 5

Forward Citations = 82(Granted Patents)

Company Filing History:

16 out of 2,861

Pioneer Electronic Corporation

patents

Years Active: 1981-1993

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16 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5253299 - Noise reduction apparatus in an FM stereo tuner (1993-10-12),

2. 5067157 - Noise reduction apparatus in an FM stereo tuner (1991-11-19),

3. 4633496 - Low-pass filter circuit (1986-12-30),

4. 4590615 - Multipath distortion reducing circuit (1986-05-20),

5. 4539697 - FM Stereo demodulating circuit (1985-09-03),

6. 4523329 - FM receiver (1985-06-11),

7. 4510452 - Circuit having square-law transfer characteristic (1985-04-09),

8. 4502148 - FM Stereo demodulator for demodulating stereo signals directly from an (1985-02-26),

9. 4497063 - FM stereo demodulator (1985-01-29),

10. 4489430 - FM Stereo demodulation circuit (1984-12-18),

11. 4399324 - Multiplex demodulation circuit (1983-08-16),

12. 4362906 - FM Receiver (1982-12-07),

13. 4315221 - Switching circuit (1982-02-09),

14. 4280101 - Stereophonic signal demodulation circuit (1981-07-21),

15. 4278944 - Chopper type switching circuit (1981-07-14),

Title: Kohji Ishida: Innovator in Noise Reduction Technology

Introduction

Kohji Ishida is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of audio technology, particularly in noise reduction systems. With a total of 16 patents to his name, Ishida has established himself as a key figure in the industry.

Latest Patents

One of Ishida's latest patents is a noise reduction apparatus in an FM stereo tuner. This innovative device includes a circuit for generating a stereo sum signal and a stereo differential signal. It features a noise eliminating circuit that divides the stereo differential signal into several divisional signals based on frequency bands. The apparatus outputs a composite signal of divisional stereo differential signals corresponding to the signal levels. Additionally, it has a circuit for reproducing a stereo signal from the composite signal and the stereo sum signal. In another embodiment, the apparatus further enhances noise reduction by eliminating low-level divisional stereo differential signals in each frequency band, generating a second stereo differential signal, and outputting a composite signal that represents this second signal along with divisional stereo sum signals.

Career Highlights

Kohji Ishida is currently associated with Pioneer Electronic Corporation, a leading company in the audio and video technology sector. His work has significantly advanced the capabilities of FM stereo tuners, making them more efficient and effective in noise reduction.

Collaborations

Ishida has collaborated with notable coworkers such as Tatsuo Numata and Masaharu Sakamoto. Their combined expertise has contributed to the development of innovative audio technologies.

Conclusion

Kohji Ishida's contributions to noise reduction technology have made a lasting impact on the audio industry. His innovative patents continue to enhance the quality of sound reproduction in FM stereo tuners.