Alfred T Anderson

Title: The Innovations of Alfred T. Anderson

Introduction

Alfred T. Anderson is a notable inventor based in St. Petersburg, FL (US). He has made significant contributions to the field of technology, particularly in the area of signal processing. With a total of 3 patents to his name, Anderson's work has had a lasting impact on various applications in telecommunications.

Latest Patents

Anderson's latest patents include the "Carrier Lock Detector" and the "Spread Spectrum Demodulator." The Carrier Lock Detector is an apparatus designed to indicate a phase lock condition between an incoming multiphase carrier signal and a local oscillator in a phase-locked loop demodulator. This invention generates a phase error signal by comparing the carrier signal with the local oscillator signal. The phase error signal is then rectified and detected for a range of values that indicate a phase lock condition. The system ensures that phase lock exists when the phase error signal is within selected voltage ranges. After detection, the error signal is low-pass filtered and compared to a predetermined threshold value to generate a phase-lock indication signal. This innovation signifies that the phase error signal remains within the voltage range corresponding to phase lock for a greater percentage of time than when the loop is not phase locked.

The Spread Spectrum Demodulator facilitates the demodulation of a wideband spread spectrum four-phase PSK (phase shift keyed) modulated carrier signal. This is accomplished through a correlator that phase shifts the modulated carrier signal based on a locally generated PN (pseudo-noise) sequence. The resulting narrow band two-phase PSK modulated carrier signal is then processed through a matched filter to remove undesired signal components, providing an intermediate frequency (IF) signal. A carrier recovery phase-lock loop demodulates the two-phase modulated IF signal to yield a baseband signal. Additionally, a timing recovery loop synchronizes the local PN sequence with the modulated carrier sequence, ensuring accurate data detection.

Career Highlights

Throughout his career, Anderson has worked with prominent companies such as NCR Corporation and E-Systems, Inc. His experience in these organizations has allowed him to refine his skills and contribute to various innovative projects.

Collaborations

Anderson has collaborated with notable individuals in the field, including Robert S. Gordy and David E. Sanders. These partnerships have further enriched his work and expanded the scope of his inventions