Company Filing History:
Years Active: 1998-2016
Title: Inventor Alain Le Guyader: Pioneering Innovations in Digital Audio Technology
Introduction
Alain Le Guyader, an accomplished inventor based in Lannion, France, has made significant contributions to the field of digital audio technology. With a total of six patents to his name, Le Guyader has focused on enhancing audio signal processing, particularly in areas related to noise shaping and encoding stability.
Latest Patents
Le Guyader's latest patents include groundbreaking advancements in controlling noise-shaping feedback loops in digital audio signal encoders. His invention focuses on avoiding instability risks during the Adaptive Differential Pulse Code Modulation (ADPCM) encoding of digital audio input signals. This method utilizes a feedback system that filters noise and comprises several essential steps. It begins with obtaining a parameter that indicates the spectral dynamic range of the signal. This parameter helps identify any risk of instability in the feedback system. By comparing this parameter to predetermined thresholds, the method is able to detect potential risks of instability, subsequently limiting the feedback only when necessary. Over a predetermined number of frames, the feedback can be gradually reactivated, ensuring a stable encoding process.
Another noteworthy patent from Le Guyader involves hierarchical coding of digital audio signals. This innovation introduces a new method where, for each current frame of an input signal, core coding is performed to generate a scalar quantization index for the samples. Additionally, enhancement coding delivers indices of scalar quantization for an enhancement signal. This process includes obtaining a filter for shaping the coding noise, enabling the determination of a target signal. By minimizing the error between a set of possible values of scalar quantization and the target signal, his method represents a significant step forward in coding noise shaping, applicable for both core bitrate coding and enhancement coding.
Career Highlights
Throughout his career, Alain Le Guyader has worked with notable companies, including France Telecom and Orange, where he has expanded his expertise in audio technology and innovation. His work has not only advanced the technical aspects of digital audio but has also influenced industry practices.
Collaborations
Le Guyader has collaborated with distinguished colleagues, including Balazs Kovesi and Stéphane Ragot. These partnerships have fostered an environment of innovation, allowing the exchange of ideas and technological advancements in their respective fields.
Conclusion
Alain Le Guyader stands out as a prominent inventor, making substantial contributions to digital audio technology through his innovative patents and collaborative efforts. His work not only enhances the quality of audio encoding but also sets a foundation for future advancements in the field. As technology continues to evolve, the significance of Le Guyader's contributions will undoubtedly remain influential in shaping the audio industry.