Patents by Inventor Christian Fraisse
Christian Fraisse has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10021482Abstract: An audio device includes an audio amplifier configured to receive an input signal and generate a differential output signal. A first signal combiner circuit is configured to generate a time-convolution signal of an analog current signal and an analog voltage signal. The analog current signal corresponds to a current at the differential output signal, and the analog voltage signal corresponds to a voltage across the differential output signal. A second signal combiner circuit is configured to subtract the generated time-convolution signal from the input signal.Type: GrantFiled: May 17, 2017Date of Patent: July 10, 2018Assignee: STMicroelectronics (Alps) SASInventors: Christian Fraisse, Angelo Nagari
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Publication number: 20170257701Abstract: An audio device includes an audio amplifier configured to receive an input signal and generate a differential output signal. A first signal combiner circuit is configured to generate a time-convolution signal of an analog current signal and an analog voltage signal. The analog current signal corresponds to a current at the differential output signal, and the analog voltage signal corresponds to a voltage across the differential output signal. A second signal combiner circuit is configured to subtract the generated time-convolution signal from the input signal.Type: ApplicationFiled: May 17, 2017Publication date: September 7, 2017Inventors: Christian Fraisse, Angelo Nagari
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Patent number: 9693138Abstract: A circuit may include an audio amplifier (314) configured to amplify an input signal (SAUDIO) to generate an output signal (SOUT+, SOUT?) suitable for driving a loud speaker (316). A first circuit (318) may be configured to generate a first analog signal (SI) based on a current level drawn by the loud speaker (316), and a second circuit (320) may be configured to generate a second analog signal (SV) based on a voltage supplied across the loud speaker (316). A third circuit (322, 312) may be configured to generate a third analog signal (RESIDUE) based on the difference between the first and second analog signals, and modify the input signal (SAUDIO) based on the third analog signal.Type: GrantFiled: August 28, 2015Date of Patent: June 27, 2017Assignee: STMicroelectronics (Alps) SASInventors: Christian Fraisse, Angelo Nagari
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Publication number: 20160182999Abstract: A circuit may include an audio amplifier (314) configured to amplify an input signal (SAUDIO) to generate an output signal (SOUT+, SOUT?) suitable for driving a loud speaker (316). A first circuit (318) may be configured to generate a first analog signal (SI) based on a current level drawn by the loud speaker (316), and a second circuit (320) may be configured to generate a second analog signal (SV) based on a voltage supplied across the loud speaker (316). A third circuit (322, 312) may be configured to generate a third analog signal (RESIDUE) based on the difference between the first and second analog signals, and modify the input signal (SAUDIO) based on the third analog signal.Type: ApplicationFiled: August 28, 2015Publication date: June 23, 2016Inventors: Christian FRAISSE, Angelo NAGARI
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Patent number: 9269345Abstract: The electronic device and a corresponding signal processing method disclosed herein reduces electromagnetic noise. To that end, the electronic device includes a delay line, an oscillator, and a modulator. The delay line generates a spread spectrum clock signal from an input clock signal, where a timing jitter and a period of jitter of the spread spectrum clock signal are controlled at each period of the spread spectrum clock signal based on a digital code. The oscillator uses the spread spectrum clock signal to generate a processing signal. The modulator modulates the processing signal as a function of an audio signal.Type: GrantFiled: May 15, 2012Date of Patent: February 23, 2016Assignee: ST-ERICSSON SAInventors: Christian Fraisse, Angelo Nagari
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Patent number: 9204215Abstract: There is described Audio driver circuit comprising a main, 1-bit digital-to-analog converter, adapted to receive a 1-bit oversampled digital audio signal. Thanks to an auxiliary digital-to-analog converter which converts into the analog domain a digital offset compensation value stored in e.g. an OTP memory register 34, and to a summing and filtering arrangement, it is possible to reduce the offset cancellation granularity in order to compensate for the offset of the main digital-to-analog converter in the output signal.Type: GrantFiled: December 20, 2013Date of Patent: December 1, 2015Assignee: ST-ERICSSON SAInventors: Christian Fraisse, Angelo Nagari
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Publication number: 20140185835Abstract: There is described Audio driver circuit comprising a main, 1-bit digital-to-analog converter, adapted to receive a 1-bit oversampled digital audio signal. Thanks to an auxiliary digital-to-analog converter which converts into the analog domain a digital offset compensation value stored in e.g. an OTP memory register 34, and to a summing and filtering arrangement, it is possible to reduce the offset cancellation granularity in order to compensate for the offset of the main digital-to-analog converter in the output signal.Type: ApplicationFiled: December 20, 2013Publication date: July 3, 2014Applicant: ST-Ericsson SAInventors: Christian FRAISSE, Angelo NAGARI
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Publication number: 20140153732Abstract: The electronic device and a corresponding signal processing method disclosed herein reduces electromagnetic noise. To that end, the electronic device includes a delay line, an oscillator, and a modulator. The delay line generates a spread spectrum clock signal from an input clock signal, where a timing jitter and a period of jitter of the spread spectrum clock signal are controlled at each period of the spread spectrum clock signal based on a digital code. The oscillator uses the spread spectrum clock signal to generate a processing signal. The modulator modulates the processing signal as a function of an audio signal.Type: ApplicationFiled: May 15, 2012Publication date: June 5, 2014Applicant: ST-Ericsson SAInventors: Christian Fraisse, Angelo Nagari
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Patent number: 6928158Abstract: A method and a circuit for regenerating a clock signal based on a flip-flop and on two complementary signals at the clock rate, the flip-flop being assembled as a divider by two of a combination of shaping signals each translating a direction, respectively rising or falling, of the edges of one of the complementary signals, and one of said shaping signals being used to reset the flip-flop.Type: GrantFiled: October 17, 2000Date of Patent: August 9, 2005Assignee: STMicroelectronics S.A.Inventors: Christian Fraisse, Claude Renous
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Publication number: 20020101370Abstract: The present invention relates to a method and a device of information transfer between two circuits exchanging data via delta-sigma converters. The present invention includes coding the information in the form of at least one signal of determined frequency corresponding to an integer multiple of a frequency of the digital data samples; mixing, at a first end of a line carrying an oversampled digital signal of the converter, the signal of determined frequency; extracting from the mixture, at a second end of the line, the signal of determined frequency; and decoding the corresponding information.Type: ApplicationFiled: December 27, 1999Publication date: August 1, 2002Inventors: MICHEL COMBE, CHRISTIAN FRAISSE
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Patent number: 6041080Abstract: A signal processing system receives and mixes a plurality of analog input signals having a maximum frequency. Each analog input signal is connected to an input of a modulator producing a high frequency oversampled digital signal. Each high frequency oversampled signal is connected to an input of a first decimation filter which produces an intermediate frequency oversampled multiple bit signal. Each of the intermediate frequency oversampled signals is connected to a respective input of a first digital mixer which produces a single mixed multiple bit output signal. The single mixed multiple bit output signal is connected to a second decimation filter which produces a final digital output signal, at a frequency suitable for representing the mixed analog input signals.Type: GrantFiled: December 26, 1996Date of Patent: March 21, 2000Assignee: SGS-Thomson Microelectronics S.A.Inventor: Christian Fraisse
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Patent number: 6031475Abstract: The present invention relates to a method and a device of information transfer between two circuits exchanging data via delta-sigma converters. The present invention includes coding the information in the form of at least one signal of determined frequency corresponding to an integer multiple of a frequency of the digital data samples; mixing, at a first end of a line carrying an oversampled digital signal of the converter, the signal of determined frequency; extracting from the mixture, at a second end of the line, the signal of determined frequency; and decoding the corresponding information.Type: GrantFiled: May 6, 1998Date of Patent: February 29, 2000Assignee: SGS-Thomson Microelectronics S.A.Inventors: Michel Combe, Christian Fraisse