Tzy-Hong S Chao

Title: The Innovations of Tzy-Hong S Chao

Introduction

Tzy-Hong S Chao is a notable inventor based in Morrisville, PA, with a significant contribution to the field of video signal processing. He holds four patents that showcase his expertise and innovative spirit in developing advanced technologies for television signal synchronization and demodulation.

Latest Patents

One of his latest patents is a video signal synchronization system. This invention discloses an apparatus and method for synchronizing the component signals of a multi-component augmented television signal between its generation and reception. The apparatus generates a training signal that indicates the position of the first pixel in each horizontal line interval of the video signal. This training signal is inserted into one horizontal line interval of the active video signal for transmission. The receiver includes circuitry that separates the training signal and derives a timing signal from it. This timing signal is crucial for defining the pixel positions of various decoded components of the received video signal, facilitating their combination. Additionally, it aligns the color subcarrier signal and generates other carrier and subcarrier signals used in the decoding process. Two training signals are disclosed: a pseudo-random noise sequence and a time-reversed, all-pass filtered, raised-cosine 2T pulse.

Another significant patent is related to a sub-Nyquist demodulator for television receivers. This invention demodulates an asymmetrical sideband modulated (ASM) signal, such as an RF NTSC television signal, into in-phase and quadrature phase components. Each component is sampled at a rate less than the Nyquist rate, resulting in signals that include aliasing distortion. The in-phase component is recovered by inserting zero-valued samples interstitially into the sampled signals and applying them to a complex filter. The resultant interpolated in-phase signal is a full bandwidth signal that is substantially free of aliasing distortion.

Career Highlights

Tzy-Hong S Chao has worked with prominent companies in the industry, including RCA Licensing Corporation and RCA Inc. His work has significantly impacted the development of television technology, particularly in signal processing and synchronization.

Collaborations

Throughout his career, Chao has collaborated with notable individuals such as Ted N Altman and Charles Benjamin Dieterich. These collaborations have contributed to the advancement of technology in the field of video signal processing.

Conclusion

Tzy-Hong S Chao's contributions to