John F Doherty

Title: John F Doherty: Innovator in Communication Technology

Introduction

John F Doherty is a notable inventor based in Ames, Iowa. He has made significant contributions to the field of communication technology, particularly in the area of acoustic echo cancellation. His innovative approach has led to the development of a unique communication device that utilizes pseudonoise signals.

Latest Patents

Doherty holds a patent for a "Communication device, apparatus, and method utilizing pseudonoise signal." This invention involves a communication device and method for acoustic echo cancellation that employs a pseudonoise signal. The process includes an audio mixer that combines the pseudonoise signal with an input signal from another communication device, resulting in a first composite signal. An audio system then converts this signal into sound within an enclosed space, which generates an acoustical echo. The system processes the echo and other sounds to create a second composite signal. A signal processor cross-correlates this signal with the pseudonoise signal to estimate the overall impulse response of the system. The processor then convolves the first composite signal with this estimate to produce an echo estimation signal, which is subtracted from the second composite signal to yield the final output signal.

Career Highlights

Doherty is affiliated with the Iowa State University Research Foundation Inc., where he continues to advance his research and development efforts. His work has been instrumental in enhancing communication technologies, making them more effective and reliable.

Collaborations

One of his notable collaborators is Steve F Russell, with whom he has worked on various projects related to communication technology.

Conclusion

John F Doherty's innovative contributions to communication technology, particularly through his patented methods for acoustic echo cancellation, highlight his role as a significant inventor in this field. His work continues to influence advancements in communication systems.