Donald R Laturell

Title: The Innovations of Donald R. Laturell

Introduction

Donald R. Laturell is a notable inventor based in Tampa, FL (US). He has made significant contributions to the field of telecommunications, holding a total of 2 patents. His work has been instrumental in advancing technology in modem identification and electronic isolation.

Latest Patents

One of Laturell's latest patents is a technique for the automatic identification of a remote modem. In the public switched telephone network, an originating modem can identify an answering modem by detecting a low-level identification signal sent from the answering modem. This identification signal is cleverly hidden within an industry-standard 'answer tone,' such as a CCITT V.25 answer tone of 2100 Hz. If the originating modem detects this signal, it terminates the standard handshaking procedure and implements a non-standard one. Conversely, if the signal is not detected, the standard handshaking procedure is completed as usual.

Another significant patent is the transformer-less hybrid circuit. This invention provides an improved transformer-less electronic isolating transformer that outputs a controlled current rather than voltage. The hybrid includes an output drive subcircuit that receives an AC signal and generates a corresponding current for two-way communication. This subcircuit not only converts voltage to current but also incorporates means for gain. Signals arriving from the line are applied directly to a near-end echo circuit, which is responsive to the output drive subcircuit's signal. Both the input and output of these subcircuits are isolated using opto-isolators that utilize photodiodes in their photovoltaic mode.

Career Highlights

Donald R. Laturell has had a distinguished career at AT&T Bell Laboratories, where he has contributed to various innovative projects. His work has been recognized for its impact on telecommunications technology.

Collaborations

Throughout his career, Laturell has collaborated with notable colleagues, including Gordon F. Bremer and Kurt E. Holmquist. These collaborations have further enriched his contributions to the field.

Conclusion

Donald R. Laturell's innovations in modem technology and electronic circuits have made a lasting impact on the telecommunications industry. His patents reflect a deep understanding of the complexities of communication systems and demonstrate his commitment to advancing technology.