Company Filing History:
Years Active: 1980-1982
Title: Spencer L. Hermanson: Innovator in Telephone Systems
Introduction
Spencer L. Hermanson is a notable inventor based in Mountain View, California. He has made significant contributions to the field of telecommunications, particularly in the development of systems that utilize Dual Tone Multi-Frequency (DTMF) signals. With a total of two patents to his name, Hermanson's work has had a lasting impact on telephone technology.
Latest Patents
Hermanson's latest patents include a DTMF signal receiver and a telephone supervision system using DTMF signals. The DTMF signal receiver is designed for telephone systems and features an amplifier with automatic gain control. This receiver effectively amplifies DTMF and audio signals, utilizing a series of bandpass and notch filters to produce outputs in response to DTMF frequencies. Additionally, the system includes a detector that signals the presence or absence of DTMF frequencies, along with a DTMF decoder that generates output signals based on simultaneous detection of specific frequency pairs. The voice guard circuit further enhances the system by preventing the detection of invalid DTMF signals.
The telephone supervision system employs a DTMF signal generator connected to the transmit line at each subscriber station. It generates various tones, such as dial tone and busy tone, in response to supervisory DTMF signals. The system is equipped with control means that facilitate the generation of DTMF signals for various conditions, including off-hook and on-hook states. This innovative system also supports optional modes like push-to-talk and conference calls.
Career Highlights
Hermanson is currently employed at Wescom, Inc., where he continues to innovate in the telecommunications sector. His work has been instrumental in enhancing the functionality and reliability of telephone systems.
Collaborations
One of his notable coworkers is Albert G. Nilssen, with whom he has likely collaborated on various projects within the company.
Conclusion
Spencer L. Hermanson's contributions to the field of telecommunications through his patents demonstrate his expertise and commitment to innovation. His work continues to influence the development of modern telephone systems.