Rudolph S Stefenel

Title: The Innovations of Rudolph S. Stefenel

Introduction

Rudolph S. Stefenel is a notable inventor based in San Jose, California. He has made significant contributions to the field of telecommunications, particularly with his innovative designs for video phones. With a total of 2 patents, his work has paved the way for advancements in how we communicate through video technology.

Latest Patents

One of his latest patents is the Conversational Video Phone. This improved video phone transmits a source image over a standard telephone line in conjunction with audio voice signals. The unique initialization protocol allows asynchronous transmission with its short format. The protocol format provides for a hardware preamble for synchronizing a receiver clock, a software preamble for identifying the video image and disabling the audio, automatic gain control adjustment data, and amplitude calibration data. The audio portion is disabled by coupling a capacitor across the telephone to effectively short the telephone. The telephone is placed across a bridge circuit which is provided with switches to balance the bridge in both the telephone audio and video modes. The transmitted and received signals pass through the same delay equalization circuit, ensuring that half the equalization is done before transmission, with the remaining half being done after reception. Input and output selectors allow the same circuit to be used. The digital signals are level shifted from 5 volts to 10 volts prior to being converted into analog, and then are level shifted down again to reduce the effects of DC offset. The digital and analog voltage supplies are coupled together with a resistor and diode, and a capacitor is coupled between the analog supply and ground to combine the reset and voltage supply functions. An RC circuit providing 180 degrees of phase shift is coupled to the crystal oscillator to produce a clock which is locked into the series resonant frequency of the oscillator. The camera and the rest of the circuitry are turned on and off by a switch coupled to a panel which can be slid in front of the camera, thus providing for the automatic protection of the camera lens when the system is switched off.

Career Highlights

Throughout his career, Rudolph has worked with several prominent companies, including Luma Telecom Incorporated and Mitsubishi Electronics America, Inc. His experience in these organizations has contributed to his expertise in telecommunications and video technology.

Collaborations

Rudolph has collaborated with notable coworkers such as Lawrence D. Emmons and James S. Mackley.