Hiroyasu Kishi

Title: Hiroyasu Kishi: Innovator in Television Technology

Introduction

Hiroyasu Kishi is a notable inventor based in Gunma, Japan. He has made significant contributions to the field of television technology, holding a total of 13 patents. His work has focused on enhancing the functionality and performance of television broadcasting systems.

Latest Patents

Among his latest patents is a device for receiving closed captioned broadcasts. This invention features a synchronizing/separator circuit that effectively separates horizontal and vertical synchronizing signals within a television signal. A phase locked loop synthesizes a clock signal at 32 fH by phase locking the horizontal synchronizing signal with a divided version of the 32 fH clock signal. The phase locked loop includes a voltage controlled oscillator (VCO) that responds to phase comparisons to achieve phase lock. Additionally, a circuit separates the run-in clock and caption data during the horizontal scanning period in the vertical blanking interval. The voltage controlled oscillator is controlled by the charging and discharging rate of a capacitor, which is charged by a constant current source, allowing for rapid phase locking to the run-in clock.

Another significant patent is the vertical driving pulse generating circuit. This circuit generates a reset pulse with a desired pulse width in response to a vertical synchronizing signal. The vertical count down circuit is reset by this pulse, leading to the generation of a vertical driving pulse with a predetermined period. The phases of the reset pulse and the frequency-divided output signal are compared to determine the period of the vertical synchronizing signal, allowing for effective switching between input and signal selecting circuits.

Career Highlights

Hiroyasu Kishi has worked with prominent companies in the electronics industry, including Sanyo Electric Co., Ltd. and Tokyo Sanyo Electric Co. His experience in these organizations has contributed to his expertise in developing innovative technologies for television broadcasting.

Collaborations

Throughout his career, Kishi has collaborated with talented individuals such as Junji Sakamoto and Hiromi Arai. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Hiroyasu Kishi's contributions to television technology through his numerous patents highlight his innovative spirit and dedication to advancing the field. His work continues to influence the way we experience television broadcasting today.