This inventor holds 6 USPTO granted patents. Top assignee: International Business Machines Corporation. Active years: 1981-2001.
Company Filing History:
Years Active: 1981-2001
Title: Innovations of Dale Brian Chapman
Introduction
Dale Brian Chapman is a notable inventor based in San Jose, CA. He has made significant contributions to the field of optical readback systems, holding a total of 6 patents. His work focuses on enhancing the performance and reliability of pulse width modulation (PWM) signals.
Latest Patents
Chapman's latest patents include a baseline correction circuit for PWM data readback systems. This innovative circuit compensates for the offset present on a PWM signal when associated transients first appear. It also addresses the decay in the PWM signal to minimize significant baseline variations. The circuit features a BCC switch that responds to a control unit, along with a low pass filter that receives the PWM signal. The low pass filter includes a capacitor that stores the voltage of the baseline variation. A difference amplifier processes the low pass filtered output and the PWM signal to provide a difference signal. This results in a high-pass filtered version of the original PWM signal. The control unit monitors disk operations and supplies a transient event signal, which activates the BCC switch. After the transient event, the control unit switches off the BCC switch, allowing the signal from the low pass filter to decay in a manner that follows the input PWM signal.
Career Highlights
Dale Brian Chapman is currently employed at International Business Machines Corporation (IBM). His work at IBM has allowed him to develop and refine his innovative technologies, contributing to advancements in the field.
Collaborations
Some of his notable coworkers include Michael O. Jenkins and Stephen A. Jove. Their collaboration has likely fostered an environment of innovation and creativity within their projects.
Conclusion
Dale Brian Chapman is a distinguished inventor whose work in baseline correction circuits has made a significant impact on optical readback systems. His contributions continue to influence advancements in technology and innovation.