Patents by Inventor Mohamed Krini
Mohamed Krini 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: 9805738Abstract: An arrangement is described for speech signal processing. An input microphone signal is received that includes a speech signal component and a noise component. The microphone signal is transformed into a frequency domain set of short-term spectra signals. Then speech formant components within the spectra signals are estimated based on detecting regions of high energy density in the spectra signals. One or more dynamically adjusted gain factors are applied to the spectra signals to enhance the speech formant components.Type: GrantFiled: September 4, 2012Date of Patent: October 31, 2017Assignee: NUANCE COMMUNICATIONS, INC.Inventors: Mohamed Krini, Ingo Schalk-Schupp, Markus Buck
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Patent number: 9613633Abstract: A speech signal processing system is described for use with automatic speech recognition and hands free speech communication. A signal pre-processor module transforms an input microphone signal into corresponding speech component signals. A noise suppression module applies noise reduction to the speech component signals to generate noise reduced speech component signals. A speech reconstruction module produces corresponding synthesized speech component signals for distorted speech component signals. A signal combination block adaptively combines the noise reduced speech component signals and the synthesized speech component signals based on signal to noise conditions to generate enhanced speech component signals for automatic speech recognition and hands free speech communication.Type: GrantFiled: October 30, 2012Date of Patent: April 4, 2017Assignee: Nuance Communications, Inc.Inventors: Mohamed Krini, Ingo Schalk-Schupp, Patrick Hannon
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Publication number: 20160035370Abstract: An arrangement is described for speech signal processing. An input microphone signal is received that includes a speech signal component and a noise component. The microphone signal is transformed into a frequency domain set of short-term spectra signals. Then speech formant components within the spectra signals are estimated based on detecting regions of high energy density in the spectra signals. One or more dynamically adjusted gain factors are applied to the spectra signals to enhance the speech formant components.Type: ApplicationFiled: September 4, 2012Publication date: February 4, 2016Applicant: NUANCE COMMUNICATIONS, INC.Inventors: Mohamed KRINI, Ingo SCHALK-SCHUPP, Markus BUCK
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Publication number: 20150255083Abstract: A speech signal processing system is described for use with automatic speech recognition and hands free speech communication. A signal pre-processor module transforms an input microphone signal into corresponding speech component signals. A noise suppression module applies noise reduction to the speech component signals to generate noise reduced speech component signals. A speech reconstruction module produces corresponding synthesized speech component signals for distorted speech component signals. A signal combination block adaptively combines the noise reduced speech component signals and the synthesized speech component signals based on signal to noise conditions to generate enhanced speech component signals for automatic speech recognition and hands free speech communication.Type: ApplicationFiled: October 30, 2012Publication date: September 10, 2015Applicant: Naunce Communication ,Inc.Inventors: Mohamed Krini, Ingo Schalk-Schupp, Patrick Hannon
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Patent number: 9129608Abstract: Embodiments of the present invention exploit redundancy of succeeding FFT spectra and use this redundancy for computing interpolated temporal supporting points. An analysis filter bank converts overlapped sequences of an audio (ex. loudspeaker) signal from a time domain to a frequency domain to obtain a time series of short-time loudspeaker spectra. An interpolator temporally interpolates this time series. The interpolation is fed to an echo canceller, which computes an estimated echo spectrum. A microphone analysis filter bank converts overlapped sequences of an audio microphone signal from the time domain to the frequency domain to obtain a time series of short-time microphone spectra. The estimated echo spectrum is subtracted from the microphone spectrum. Further signal enhancement (filtration) may be applied. A synthesis filter bank converts the filtered microphone spectra to the time domain to generate an echo compensated audio microphone signal.Type: GrantFiled: March 6, 2013Date of Patent: September 8, 2015Assignee: NUANCE COMMUNICATIONS, INC.Inventors: Mohamed Krini, Gerhard Uwe Schmidt, Bernd Iser, Arthur Wolf
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Patent number: 9076455Abstract: Embodiments of the present invention exploit redundancy of succeeding FFT spectra and use this redundancy for computing interpolated temporal supporting points. An analysis filter bank converts overlapped sequences of an audio (ex. loudspeaker) signal from a time domain to a frequency domain to obtain a time series of short-time loudspeaker spectra. An interpolator temporally interpolates this time series. The interpolation is fed to an echo canceller, which computes an estimated echo spectrum. A microphone analysis filter bank converts overlapped sequences of an audio microphone signal from the time domain to the frequency domain to obtain a time series of short-time microphone spectra. The estimated echo spectrum is subtracted from the microphone spectrum. Further signal enhancement (filtration) may be applied. A synthesis filter bank converts the filtered microphone spectra to the time domain to generate an echo compensated audio microphone signal.Type: GrantFiled: August 22, 2012Date of Patent: July 7, 2015Assignee: NUANCE COMMUNICATIONS, INC.Inventors: Mohamed Krini, Gerhard Schmidt, Bernd Iser, Arthur Wolf
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Patent number: 9026435Abstract: The invention provides a method for estimating a fundamental frequency of a speech signal comprising the steps of receiving a signal spectrum of the speech signal, filtering the signal spectrum to obtain a refined signal spectrum, determining a cross-power spectral density using the refined signal spectrum and the signal spectrum, transforming the cross-power spectral density into the time domain to obtain a cross-correlation function, and estimating the fundamental frequency of the speech signal based on the cross-correlation function.Type: GrantFiled: May 3, 2010Date of Patent: May 5, 2015Assignee: Nuance Communications, Inc.Inventors: Mohamed Krini, Gerhard Schmidt
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Patent number: 8849656Abstract: A system enhances speech by detecting a speaker's utterance through a first microphone positioned a first distance from a source of interference. A second microphone may detect the speaker's utterance at a different position. A monitoring device may estimate the power level of a first microphone signal. A synthesizer may synthesize part of the first microphone signal by processing the second microphone signal. The synthesis may occur when power level is below a predetermined level.Type: GrantFiled: October 14, 2011Date of Patent: September 30, 2014Assignee: Nuance Communications, Inc.Inventors: Gerhard Schmidt, Mohamed Krini
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Patent number: 8706483Abstract: A system enhances the quality of a digital speech signal that may include noise. The system identifies vocal expressions that correspond to the digital speech signal. A signal-to-noise ratio of the digital speech signal is measured before a portion of the digital speech signal is synthesized. The selected portion of the digital speech signal may have a signal-to-noise ratio below a predetermined level and the synthesis of the digital speech signal may be based on speaker identification.Type: GrantFiled: October 20, 2008Date of Patent: April 22, 2014Assignee: Nuance Communications, Inc.Inventors: Franz Gerl, Tobias Herbig, Mohamed Krini, Gerhard Uwe Schmidt
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Patent number: 8666736Abstract: The present invention relates to a method for signal processing comprising the steps of providing a set of prototype spectral envelopes, providing a set of reference noise prototypes, wherein the reference noise prototypes are obtained from at least a sub-set of the provided set of prototype spectral envelopes, detecting a verbal utterance by at least one microphone to obtain a microphone signal, processing the microphone signal for noise reduction based on the provided reference noise prototypes to obtain an enhanced signal and encoding the enhanced signal based on the provided prototype spectral envelopes to obtain an encoded enhanced signal.Type: GrantFiled: August 7, 2009Date of Patent: March 4, 2014Assignee: Nuance Communications, Inc.Inventors: Tim Haulick, Mohamed Krini, Shreyas Paranjpe, Gerhard Schmidt
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Publication number: 20130208905Abstract: Embodiments of the present invention exploit redundancy of succeeding FFT spectra and use this redundancy for computing interpolated temporal supporting points. An analysis filter bank converts overlapped sequences of an audio (ex. loudspeaker) signal from a time domain to a frequency domain to obtain a time series of short-time loudspeaker spectra. An interpolator temporally interpolates this time series. The interpolation is fed to an echo canceller, which computes an estimated echo spectrum. A microphone analysis filter bank converts overlapped sequences of an audio microphone signal from the time domain to the frequency domain to obtain a time series of short-time microphone spectra. The estimated echo spectrum is subtracted from the microphone spectrum. Further signal enhancement (filtration) may be applied. A synthesis filter bank converts the filtered microphone spectra to the time domain to generate an echo compensated audio microphone signal.Type: ApplicationFiled: August 22, 2012Publication date: August 15, 2013Applicant: NUANCE COMMUNICATIONS, INC.Inventors: Mohamed Krini, Gerhard Schmidt, Bernd Iser, Arthur Wolf
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Patent number: 8199928Abstract: An apparatus processes an acoustic input signal to provide an output signal with reduced noise. The apparatus weights the input signal based on a frequency-dependent weighting function. A frequency-dependent threshold function bounds the weighting function from below.Type: GrantFiled: May 9, 2008Date of Patent: June 12, 2012Assignee: Nuance Communications, Inc.Inventors: Gerhard Uwe Schmidt, Raymond Brückner, Markus Buck, Ange Tchinda-Pockem, Mohamed Krini
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Patent number: 8190426Abstract: An audio enhancement refines a short-time spectrum. The refinement may reduce overlap between audio sub-bands. The sub-bands are transformed into sub-band short-time spectra. A portion of the spectra are time-delayed. The sub-band short-time spectrum and the time-delayed portion are filtered to obtain a refined sub-band short-time spectrum. The refined spectrum improves audio processing.Type: GrantFiled: November 30, 2007Date of Patent: May 29, 2012Assignee: Nuance Communications, Inc.Inventors: Mohamed Krini, Gerhard Uwe Schmidt
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Publication number: 20120109647Abstract: A system enhances speech by detecting a speaker's utterance through a first microphone positioned a first distance from a source of interference. A second microphone may detect the speaker's utterance at a different position. A monitoring device may estimate the power level of a first microphone signal. A synthesizer may synthesize part of the first microphone signal by processing the second microphone signal. The synthesis may occur when power level is below a predetermined level.Type: ApplicationFiled: October 14, 2011Publication date: May 3, 2012Applicant: NUANCE COMMUNICATIONS, INC.Inventors: Gerhard Uwe Schmidt, Mohamed Krini
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Patent number: 8050914Abstract: A system enhances speech by detecting a speaker's utterance through a first microphone positioned a first distance from a source of interference. A second microphone may detect the speaker's utterance at a different position. A monitoring device may estimate the power level of a first microphone signal. A synthesizer may synthesize part of the first microphone signal by processing the second microphone signal. The synthesis may occur when power level is below a predetermined level.Type: GrantFiled: November 12, 2008Date of Patent: November 1, 2011Assignee: Nuance Communications, Inc.Inventors: Gerhard Uwe Schmidt, Mohamed Krini
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Publication number: 20100286981Abstract: The invention provides a method for estimating a fundamental frequency of a speech signal comprising the steps of receiving a signal spectrum of the speech signal, filtering the signal spectrum to obtain a refined signal spectrum, determining a cross-power spectral density using the refined signal spectrum and the signal spectrum, transforming the cross-power spectral density into the time domain to obtain a cross-correlation function, and estimating the fundamental frequency of the speech signal based on the cross-correlation function.Type: ApplicationFiled: May 3, 2010Publication date: November 11, 2010Applicant: NUANCE COMMUNICATIONS, INC.Inventors: Mohamed Krini, Gerhard Schmidt
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Publication number: 20100036659Abstract: The present invention relates to a method for signal processing comprising the steps of providing a set of prototype spectral envelopes, providing a set of reference noise prototypes, wherein the reference noise prototypes are obtained from at least a sub-set of the provided set of prototype spectral envelopes, detecting a verbal utterance by at least one microphone to obtain a microphone signal, processing the microphone signal for noise reduction based on the provided reference noise prototypes to obtain an enhanced signal and encoding the enhanced signal based on the provided prototype spectral envelopes to obtain an encoded enhanced signal.Type: ApplicationFiled: August 7, 2009Publication date: February 11, 2010Applicant: Nuance Communications, Inc.Inventors: Tim Haulick, Mohamed Krini, Shreyas Paranjpe, Gerhard Schmidt
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Publication number: 20090216526Abstract: A system enhances speech by detecting a speaker's utterance through a first microphone positioned a first distance from a source of interference. A second microphone may detect the speaker's utterance at a different position. A monitoring device may estimate the power level of a first microphone signal. A synthesizer may synthesize part of the first microphone signal by processing the second microphone signal. The synthesis may occur when power level is below a predetermined level.Type: ApplicationFiled: November 12, 2008Publication date: August 27, 2009Inventors: Gerhard Uwe Schmidt, Mohamed Krini
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Patent number: 7554465Abstract: A sampling rate conversion system reduces the signal processing burdens carried by cellular phones, headsets, and other electronic devices. Because the system consumes fewer resources to convert between signal sampling rates, the system may significantly reduce processing time and resource requirements in the device. As a result, the device may instead devote resources to performing other useful tasks, such as interacting with the user through a graphical user interface and performing selected processing tasks.Type: GrantFiled: September 14, 2007Date of Patent: June 30, 2009Assignee: Harman Becker Automotive Systems GmbHInventors: Gerhard Uwe Schmidt, Mohamed Krini, Martin Röβler
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Publication number: 20090119096Abstract: A system enhances the quality of a digital speech signal that may include noise. The system identifies vocal expressions that correspond to the digital speech signal. A signal-to-noise ratio of the digital speech signal is measured before a portion of the digital speech signal is synthesized. The selected portion of the digital speech signal may have a signal-to-noise ratio below a predetermined level and the synthesis of the digital speech signal may be based on speaker identification.Type: ApplicationFiled: October 20, 2008Publication date: May 7, 2009Inventors: Franz Gerl, Tobias Herbig, Mohamed Krini, Gerhard Uwe Schmidt