Company Filing History:
11 out of 2,149 
1 out of 832,680 Years Active: 2011-2017
Title: Marcel Joho: Innovator in Active Noise Reduction Technology
Introduction
Marcel Joho is a prominent inventor based in Framingham, MA, known for his significant contributions to the field of active noise reduction technology. With a total of 12 patents to his name, Joho has made remarkable advancements that enhance audio experiences in various environments.
Latest Patents
Among his latest innovations is the "Dynamically Configurable ANR Filter Block Topology." This active noise reduction (ANR) circuit features a digital feed-forward ANR pathway that is coupled to a feed-forward microphone. This design allows the detection of environmental sounds outside a casing and utilizes a first acoustic driver to output sounds within the casing. The digital feed-forward ANR pathway applies multiple filters using a first set of coefficients to convert signals from the microphone into anti-noise sounds, effectively reducing environmental noise. In response to specific stimuli, the pathway can adjust the filters using a second set of coefficients, allowing human speech sounds to be conveyed with less reduction than provided by the initial filters.
Another notable patent is the "Frequency-Dependent ANR Reference Sound Compression." Similar to his previous work, this circuit employs a digital feed-forward ANR pathway and a feed-forward microphone to detect external sounds. It also utilizes a first acoustic driver for sound output within the casing. The pathway applies a series of filters to convert microphone signals into anti-noise sounds, with the ability to adjust the degree of noise reduction based on external stimuli.
Career Highlights
Marcel Joho has worked with renowned companies, including Bose Corporation, where he has honed his skills and contributed to innovative projects in audio technology. His work has significantly impacted the development of advanced noise reduction systems.
Collaborations
Throughout his career, Joho has collaborated with talented individuals such as Ricardo Federico Carreras and Daniel M Gauger, Jr. These partnerships have fostered a creative environment that has led to groundbreaking advancements in the field.
Conclusion
Marcel Joho's contributions to active noise reduction technology have established him as a key figure in the industry. His innovative patents and collaborations reflect his commitment to enhancing audio experiences through cutting-edge technology.
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