This inventor holds 2 USPTO granted patents. Top assignees: Alcatel, Alcatel Telspace. Active years: 2001.
Company Filing History:
Years Active: 2001
Title: Christian Guillemain: Innovator in Digital Signal Processing
Introduction
Christian Guillemain is a notable inventor based in Sannois, France. He has made significant contributions to the field of digital signal processing, holding a total of 2 patents. His work focuses on improving the efficiency and accuracy of digital signal reception.
Latest Patents
Guillemain's latest patents include an "Apparatus for estimating the frequency difference existing between the carrier frequency of a digital signal and the frequency of a receiver local oscillator." This apparatus is designed to estimate the frequency difference between the carrier frequency of a received digital signal and the frequency of a local oscillator in a receiver. The receiver performs quadrature demodulation on the received signal, utilizing a detector to assess the noise level in the receive filters' band. A processor computes discrete Fourier transforms on the received signal, while a summer sums the energy levels detected around the center frequency. A subtractor removes the noise level from the energy bands, and a comparator delivers an estimate of the frequency difference.
Another significant patent is for a "System for detecting the presence of a digital signal carrier wave, and a receiver including such a system." This invention relates to detecting a carrier wave in a digital signal at a specific frequency. The system provides at least two baseband samples of the digital signal at each symbol time. It includes a timing estimator that generates an error signal corresponding to the phase error between the recovered clock frequency and a local clock frequency. A detector generates a detection signal indicating the presence of a carrier wave whenever the variance of the error signal reaches a threshold value. This invention is particularly applicable to receivers of signals transmitted in DTMA mode.
Career Highlights
Christian Guillemain has worked with prominent companies in the telecommunications sector, including Alcatel Telspace and Alcatel. His experience in these organizations has allowed him to develop and refine his innovative ideas in digital signal processing.
Collaborations
Guillemain has collaborated with various professionals in his field, including Abdelkrim Ferrad, who has contributed to his projects and research endeavors.
Conclusion
Christian Guillemain's contributions to digital signal processing through his patents and career experiences highlight his role as an innovator in the field. His work continues to influence advancements in technology and telecommunications.