Tien-Lin Chang

Title: Tien-Lin Chang: Innovator in Digital Filtering and Fingerprint Identification

Introduction

Tien-Lin Chang is a notable inventor based in Orange, California. He has made significant contributions to the fields of digital filtering and automatic fingerprint identification systems. With a total of 2 patents, his work showcases innovative solutions to complex problems in technology.

Latest Patents

One of Tien-Lin Chang's latest patents is the "Low Roundoff Noise Digital Filter." This invention employs an error feedback circuit in a digital filter to significantly lower noise in the output. By feeding back the least significant (roundoff) output bits of the quantizer, rather than discarding them, the circuit enhances the overall performance of the digital filter. The feedback circuit includes a digital delay circuit, a multiplier, and an adder, all working together to improve the output signal quality.

Another significant patent is the "Non-Fingerprint Region Indicator." This invention enhances the performance of automatic fingerprint identification systems by reducing the system's response to non-fingerprint-like regions within an image field. Utilizing a two-dimensional generalized sequency analyzer, such as a fast Fourier transform machine, the system identifies discrete frequency terms within a selected bandwidth. Logic means further analyze the energy levels of the spectral content to signal the presence of non-fingerprint-like regions in the scanned image.

Career Highlights

Tien-Lin Chang is currently associated with Rockwell International Corporation, where he continues to innovate and contribute to technological advancements. His work has had a lasting impact on the fields he specializes in, particularly in improving digital signal processing and biometric identification systems.

Collaborations

Throughout his career, Tien-Lin Chang has collaborated with notable colleagues, including Jimmy H Kabaian and John P Riganati. These collaborations have fostered an environment of innovation and creativity, leading to the development of groundbreaking technologies.

Conclusion

In summary, Tien-Lin Chang is a distinguished inventor whose work in digital filtering and fingerprint identification has made significant strides in technology. His patents reflect a commitment to enhancing system performance and addressing complex challenges in the field.