Patents by Inventor Kuan-Chieh Yen
Kuan-Chieh Yen 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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Publication number: 20110125491Abstract: The perceived quality of a speech signal is improved by estimating the average power of first and second signal components and applying a first gain factor to the second signal components to generate adjusted second signal components. The first gain factor is selected such that on application of the first gain factor to the second signal components, the ratio of the average power of the first signal components to the average power of the adjusted second signal components would be a first predetermined value, the first predetermined value being such as to inhibit perceptual distortion of the improved speech signal.Type: ApplicationFiled: November 23, 2009Publication date: May 26, 2011Inventors: Rogerio Guedes Alves, Kuan-Chieh Yen, Michael Christopher Vartanian, Sameer Arun Gadre
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Publication number: 20110125492Abstract: The perceived quality of a narrowband speech signal truncated from a wideband speech signal is improved by generating in a third frequency band third speech components matching first speech components in a first frequency band of the narrowband signal, and generating in a fourth frequency band fourth speech components matching second speech components in a second frequency band of the narrowband signal. A first gain factor is applied to the third speech components to generate adjusted third speech components, and a second gain factor is applied to the fourth speech components to generate adjusted fourth speech components, the gain factors being selected such that the ratios of the average powers of the adjusted third and fourth speech components to the average power of the first speech components are predetermined values.Type: ApplicationFiled: November 23, 2009Publication date: May 26, 2011Applicant: CAMBRIDGE SILICON RADIO LIMITEDInventors: Rogerio Guedes Alves, Kuan-Chieh Yen, Michael Christopher Vartanian, Sameer Arun Gadre
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Publication number: 20100251051Abstract: A method and apparatus for decoding portions of a data stream, wherein each portion comprises a plurality of samples. The method comprises storing portions of the data stream, decoding portions of the data stream to form decoded portions, and storing the decoded portions. The method further comprises identifying that a portion of the data stream is degraded. Following identifying that a portion of the data stream is degraded, the method generates a decoded portion for the degraded portion of the data stream using the stored decoded portions. The method also updates a state of a decoder by: estimating a pitch period of the degraded portion; selecting a group of successive samples of the stored portions of the data stream, the group of successive samples offset from the degraded portion in the data stream by a multiple of the estimated pitch period; and decoding the selected samples at the decoder.Type: ApplicationFiled: March 30, 2009Publication date: September 30, 2010Applicant: Cambridge Silicon Radio LimitedInventors: Xuejing Sun, Kuan-Chieh Yen
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Patent number: 7773759Abstract: Improved vocal signals are obtained in headsets and similar devices by including a microphone inside a chamber formed at least in part by the wearer's ear. This second microphone provides a reduced noise input signal. The reduced noise signal is corrected by input from another microphone, located outside the chamber. This correction can include echo cancellation, spectral shaping, frequency extension, and the like.Type: GrantFiled: August 10, 2006Date of Patent: August 10, 2010Assignee: Cambridge Silicon Radio, Ltd.Inventors: Rogerio G. Alves, Kuan-Chieh Yen
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Publication number: 20100185441Abstract: A method of updating a state of a decoder that decodes successive portions of a data stream representing an encoded voice signal in dependence on its state, the method comprising: at the decoder, decoding portions of the data stream to form decoded portions; storing the decoded portions; storing respective decoder states held by the decoder after forming each decoded portion; identifying that a portion of the data stream is degraded; estimating a pitch period of a stored decoded portion formed by decoding a portion of the data stream that precedes the degraded portion of the data stream; selecting a stored decoder state held by the decoder after decoding a portion of the data stream that precedes the degraded portion by a multiple of the estimated pitch period; and updating the state of the decoder with the selected decoder state.Type: ApplicationFiled: January 23, 2009Publication date: July 22, 2010Applicant: CAMBRIDGE SILICON RADIO LIMITEDInventors: Xuejing Sun, Kuan-Chieh Yen
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Publication number: 20100081482Abstract: An audio handling device comprising: a source of audio data; a microphone; a loudspeaker; a transmitter for transmitting audio data; modification means for modifying the audio data; and a control unit for controlling the operation of the device, the control unit being capable of receiving signals from the microphone and configuring the conveying of audio data from the source to one or both of the loudspeaker and the transmitter; the control unit being capable of configuring the device such that during at least a probing period the modification means modifies audio data from the source and the modified audio data is transmitted by the transmitter, and being arranged to select in dependence on data dependent on signals received from the microphone whether to apply audio data from the source to the loudspeaker.Type: ApplicationFiled: September 26, 2008Publication date: April 1, 2010Applicant: CAMBRIDGE SILICON RADIO LIMITEDInventors: Kuan-Chieh Yen, Rogerio Guedes Alves
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Publication number: 20090271187Abstract: A two microphone noise reduction system is described. In an embodiment, input signals from each of the microphones are divided into subbands and each subband is then filtered independently to separate noise and desired signals and to suppress non-stationary and stationary noise. Filtering methods used include adaptive decorrelation filtering. A post-processing module using adaptive noise cancellation like filtering algorithms may be used to further suppress stationary and non-stationary noise in the output signals from the adaptive decorrelation filtering and a single microphone noise reduction algorithm may be used to further provide optimal stationary noise reduction performance of the system.Type: ApplicationFiled: April 25, 2008Publication date: October 29, 2009Inventors: Kuan-Chieh Yen, Rogerio Guedes Alves
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Publication number: 20090254340Abstract: A signal processor for estimating noise power in an audio signal includes a filter unit for generating a series of power values, each power value representing the power in the audio signal at a respective one of a plurality of frequency bands; a signal classification unit for analysing successive portions of the audio signal to assess whether each portion contains features characteristic of speech, and for classifying each portion in dependence on that analysis; a correction unit for estimating a minimum power value in a time-limited part of the audio signal, estimating the total noise power in that part of the audio signal and forming a correction factor dependent on the ratio of the minimum power value to the estimated total noise power, the correction unit being configured to estimate the minimum power value and the total noise power over only those portions of the time-limited part of the signal that are classified by the signal classification unit as being less characteristic of speech; and a noise estimType: ApplicationFiled: April 7, 2008Publication date: October 8, 2009Applicant: CAMBRIDGE SILICON RADIO LIMITEDInventors: Xuejing Sun, Kuan-Chieh Yen, Rogerio Guedes Alves
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Publication number: 20090225997Abstract: An audio processing device for reducing the effect on a first signal of echo from a second signal, the device comprising: an echo reduction processor for processing the first signal to reduce echo in it, the echo reduction unit having: a first mode of operation for reducing echo of a first function from the first signal; and a second mode of operation for reducing echo of a second function from the first signal, the second function being more complex than the first function and the echo reduction processor being such as to consume more power in the second mode of operation than in the first mode of operation; and an echo reduction controller for controlling the echo reduction processor to operate in a selected one of the first mode of operation and the second mode of operation.Type: ApplicationFiled: April 16, 2008Publication date: September 10, 2009Applicant: CAMBRIDGE SILICON RADIO LIMITEDInventors: Rogerio Guedes Alves, Kuan-Chieh Yen, Bryan Neilson
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Publication number: 20080310644Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem. Individual aspects comprehended related to echo and noise reduction, and divergence control.Type: ApplicationFiled: August 21, 2008Publication date: December 18, 2008Applicant: CLARITY TECHNOLOGIES, INC.Inventors: Rogerio G. Alves, Kuan-Chieh Yen
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Publication number: 20080310643Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem. Individual aspects comprehended related to echo and noise reduction, and divergence control.Type: ApplicationFiled: August 21, 2008Publication date: December 18, 2008Applicant: CLARITY TECHNOLOGIES, INC.Inventors: Rogerio G. Alves, Kuan-Chieh Yen
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Publication number: 20080304654Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem. Individual aspects comprehended related to echo and noise reduction, and divergence control.Type: ApplicationFiled: August 18, 2008Publication date: December 11, 2008Applicant: CLARITY TECHNOLOGIES, INC.Inventors: Rogerio G. Alves, Kuan-Chieh Yen
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Publication number: 20080304676Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem. Individual aspects comprehended related to echo and noise reduction, and divergence control.Type: ApplicationFiled: August 21, 2008Publication date: December 11, 2008Applicant: CLARITY TECHNOLOGIES, INC.Inventors: Rogerio G. Alves, Kuan-Chieh Yen
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Patent number: 7433463Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem. Individual aspects comprehended related to echo and noise reduction, and divergence control.Type: GrantFiled: August 10, 2004Date of Patent: October 7, 2008Assignee: Clarity Technologies, Inc.Inventors: Rogerio G. Alves, Kuan-Chieh Yen
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Patent number: 7426270Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.Type: GrantFiled: August 10, 2005Date of Patent: September 16, 2008Assignee: Clarity Technologies, Inc.Inventors: Rogerio G. Alves, Kuan-Chieh Yen, Lester Soon Huat Ngia
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Publication number: 20080037801Abstract: Improved vocal signals are obtained in headsets and similar devices by including a microphone inside a chamber formed at least in part by the wearer's ear. This second microphone provides a reduced noise input signal. The reduced noise signal is corrected by input from another microphone, located outside the chamber. This correction can include echo cancellation, spectral shaping, frequency extension, and the like.Type: ApplicationFiled: August 10, 2006Publication date: February 14, 2008Applicant: Cambridge Silicon Radio, Ltd.Inventors: Rogerio G. Alves, Kuan-Chieh Yen
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Publication number: 20070041575Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.Type: ApplicationFiled: August 10, 2005Publication date: February 22, 2007Inventors: Rogerio Alves, Kuan-Chieh Yen, Lester Huat Ngia
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Publication number: 20060034447Abstract: A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem. Individual aspects comprehended related to echo and noise reduction, and divergence control.Type: ApplicationFiled: August 10, 2004Publication date: February 16, 2006Applicant: CLARITY TECHNOLOGIES, INC.Inventors: Rogerio Alves, Kuan-Chieh Yen