Wan-Chieh Pai

Title: Innovations by Wan-Chieh Pai

Introduction

Wan-Chieh Pai is a notable inventor based in San Jose, California. He has made significant contributions to the field of acoustic technology, holding a total of 10 patents. His work focuses on enhancing hearing devices and presence detection systems, showcasing his innovative approach to solving complex problems.

Latest Patents

One of his latest patents is for an acoustic feedback control system. This system is designed to enable devices to perform hearing enhancement while effectively suppressing acoustic feedback. During the hearing enhancement process, the device amplifies environmental noise based on a unique hearing profile associated with the user. This personalization optimizes playback audio by adjusting equalization settings, dynamic range, and other characteristics. The acoustic feedback control includes an acoustic feedback cancellation (AFC) component that utilizes an adaptive filter to estimate and cancel feedback signals. Additionally, the AFC component can prevent entrainment by detecting periodic signals and adjusting the adaptation rate of the filter accordingly. Another significant patent involves presence detection using ultrasonic signals with concurrent audio playback. This technique allows devices to detect a person's movement in an environment by emitting ultrasonic signals while simultaneously outputting audible sound. The devices analyze changes in frequency, or Doppler shifts, of the ultrasonic signals reflected off the person to determine movement. However, the challenge lies in the distortions caused by the audible sound, which can mislead the detection process. Wan-Chieh Pai's techniques include processing audio signals to eliminate these distortions, thereby improving the accuracy of movement detection.

Career Highlights

Throughout his career, Wan-Chieh Pai has worked with prominent companies such as Fortemedia, Inc. and Amazon Technologies, Inc. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking innovations in audio technology.

Collaborations

He has collaborated with talented individuals, including Ming Zhang and Ping Dong, who have contributed to his projects and innovations.

Conclusion

Wan-Chieh Pai's work exemplifies the spirit of innovation in the field of acoustic technology. His patents reflect a commitment to enhancing user experience through advanced hearing solutions and presence detection systems. His contributions continue to influence the industry and pave the way for future advancements.