This inventor holds 2 USPTO granted patents. Top assignee: International Business Machines Corporation. Active years: 1976-1977.
Company Filing History:
Years Active: 1976-1977
Title: Ulrich Appel: Innovator in Digital Communication Technologies
Introduction
Ulrich Appel is a notable inventor based in Munich, Germany. He has made significant contributions to the field of digital communication, holding 2 patents that showcase his innovative approach to voice signaling and echo detection.
Latest Patents
One of his latest patents is focused on digital voice signaling with digital echo detection and voice activity. This invention introduces a connection system for varied distance digital communication capable of handling telephone signals. It utilizes Voice Activity Compression (VAC) to effectively share a given number of digital transmission channels among a greater number of virtual telephone connections. The telephone signals are delta-modulated and demodulated in system connection stations. The VAC processing circuits, equipped with a small increment of decision logic, provide echo suppression. This echo suppression is rendered as a 'value-added' service at a relatively small increment of station cost over the cost of VAC processing. The system also reduces echo interference with original telephone signal activity in the send channels by digitally controlling gain in the demodulation stage.
Another significant patent by Appel involves loss signal generation for delta-modulated signals. This digital communication system employs delta-modulation coders and decoders for voice signal conversion. It addresses signal inequalities at remote ends of a coder-decoder connection, which may occur due to unscheduled momentary interruptions of the transmission channel. The system adjusts these inequalities by inserting a special pseudo-random 'noise' signal at the remote demodulator. The Voice Activity Compression (VAC) processing circuits are utilized to develop line activity indications, which are processed to produce VAC 'channel use' information sent over a separate channel for remote demultiplexing control.
Career Highlights
Ulrich Appel is currently associated with the International Business Machines Corporation (IBM), where he continues to innovate in the field of digital communication technologies. His work has significantly impacted the efficiency and reliability of voice transmission systems.
Collaborations
He collaborates with Paul Abramson, contributing to advancements in their shared field of expertise.
Conclusion
Ulrich Appel's contributions to digital communication through his innovative patents demonstrate his commitment to enhancing voice signaling technologies. His work continues to influence the industry and improve communication systems worldwide.