Jianglong Li

Title: Innovations of Jianglong Li in Signal Processing

Introduction

Jianglong Li is a notable inventor based in Hangzhou, China, recognized for his contributions to signal processing technologies. With a total of three patents to his name, he has made significant advancements in automatic gain control systems, particularly in audio and video applications.

Latest Patents

One of Jianglong Li's latest patents is titled "Long-term signal estimation during automatic gain control." This invention discloses systems and methods for generating a long-term signal level estimate during automatic gain control. In this method, a computing device receives an input signal derived from an upstream input signal. The device selects a first subset of the feed data and divides it into multiple analysis intervals. It then calculates a statistical average for each interval and generates a first Gaussian distribution based on these averages. Using characteristics of this distribution, the device determines the long-term signal level estimate and applies a first stage gain to the input signal.

Another significant patent is "Two-stage digital automatic gain control." This invention outlines systems and methods for maintaining a stable audio level in audio and video conferencing applications. In this embodiment, a first stage applies a gain based on a long-term estimate of the signal level, while a second stage gain, based on a short-term estimate, assists in achieving the target level. Some embodiments utilize statistical analysis of a buffer to enhance the accuracy of the long-term signal level estimate.

Career Highlights

Jianglong Li is currently employed at Zoom Video Communications, Inc., where he continues to innovate in the field of signal processing. His work focuses on improving audio and video quality in conferencing applications, which is crucial for effective communication in today's digital world.

Collaborations

Throughout his career, Jianglong Li has collaborated with talented individuals such as Yu Rao and Yangzhong Wang. These collaborations have contributed to the development of advanced technologies in his field.

Conclusion

Jianglong Li's innovative work in signal processing, particularly in automatic gain control, showcases his expertise and commitment to enhancing audio and video communication technologies. His patents reflect a deep understanding of statistical analysis and signal estimation, making significant contributions to the industry.