Patents by Inventor Doh-Suk Kim

Doh-Suk Kim 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).

  • Patent number: 10715575
    Abstract: A service request for communication services for communication clients is received. In response, a communication service network is set up to support the communication services. Routing metadata is generated for each of the communication clients. The routing metadata is to be used by each of the communication clients for sharing service quality information with a respective peer communication client over a light-weight peer-to-peer (P2P) network. The routing metadata is downloaded to each of the communication clients. A communication client may exchange service signaling packets or service data packets over the communication service network. When the communication client determines that there is a problematic region in a bitstream received from the communication server, the communication client can request a peer communication client for a service quality information portion related to the problematic region.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: July 14, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Shen Huang, Doh-Suk Kim, Xuejing Sun
  • Publication number: 20200162603
    Abstract: This disclosure falls into the field of voice communication systems, more specifically it is related to the field of voice quality estimation in a packet based voice communication system. In particular the disclosure provides a method and device for reducing a prediction error of the voice quality estimation by considering the content of lost packets. Furthermore, this disclosure provides a method and device which uses a voice quality estimating algorithm to calculate the voice quality estimate based on an input which is switchable between a first and a second input mode.
    Type: Application
    Filed: October 21, 2019
    Publication date: May 21, 2020
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Doh-Suk KIM, Shen HUANG
  • Patent number: 10652120
    Abstract: This disclosure falls into the field of voice communication systems, more specifically it is related to the field of voice quality estimation in a packet based voice communication system. In particular the disclosure provides methods, computer program products and devices for reducing a prediction error of the voice quality estimation by considering forward error correction of lost voice packets.
    Type: Grant
    Filed: May 5, 2016
    Date of Patent: May 12, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Doh-Suk Kim
  • Patent number: 10504660
    Abstract: Disclosed is a method for adsorbing a dye for a dye-sensitized solar cell. The method includes: coating a paste including metal oxide nanoparticles on the upper surface of a titanium oxide thin film and calcining the coated paste to form a porous film; adding an additive to a sensitizing dye solution to promote the adsorption of the dye; and dipping the porous film in the sensitizing dye solution to adsorb the sensitizing dye onto the surface of the porous film. The sensitizing dye solution is a dispersion of the sensitizing dye in an organic solvent. Also disclosed are a working electrode prepared using the sensitizing dye solution and a dye-sensitized solar cell including the working electrode. The addition of the additive shortens the time of dye adsorption. Despite the shortened adsorption time, the dye does not undergo desorption in the long term as well as in the short term, ensuring long-term stability of the solar cell.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: December 10, 2019
    Assignee: Korean Institute of Science and Technology
    Inventors: Min Jae Ko, Bong Soo Kim, Jin Young Kim, Hong Gon Kim, Hae Jung Son, Doh-Kwon Lee, Jin Ah Lee, Hee Suk Jung, Hwa Young Jin
  • Patent number: 10490206
    Abstract: Systems and methods are described for measuring capture performance of multiple voice signals. A first speech signal is applied to a device, and measured at far-end at a far-end of a testing environment. A second speech signal is separately applied to the device, and is also measured at the far end. The measured speech signals are added, and a quality assessment model is applied to the first far-end combined signal to obtain a first quality metric. The first speech signal and the second speech signal are then both applied at the same time to the device and measured at the far-end. The quality assessment model is applied to the second far-end combined signal to obtain a second quality metric. The quality metric for the second far-end combined signal is normalized, based on the first quality metric, to obtain a performance index for the device.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: November 26, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Doh-Suk Kim
  • Patent number: 10455080
    Abstract: This disclosure falls into the field of voice communication systems, more specifically it is related to the field of voice quality estimation in a packet based voice communication system. In particular the disclosure provides a method and device for 5 reducing a prediction error of the voice quality estimation by considering the content of lost packets. Furthermore, this disclosure provides a method and device which uses a voice quality estimating algorithm to calculate the voice quality estimate based on an input which is switchable between a first and a second input mode.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: October 22, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Doh-Suk Kim, Shen Huang
  • Publication number: 20180350393
    Abstract: Systems and methods are described for measuring capture performance of multiple voice signals. A first speech signal is applied to a device, and measured at far-end at a far-end of a testing environment. A second speech signal is separately applied to the device, and is also measured at the far end. The measured speech signals are added, and a quality assessment model is applied to the first far-end combined signal to obtain a first quality metric. The first speech signal and the second speech signal are then both applied at the same time to the device and measured at the far-end. The quality assessment model is applied to the second far-end combined signal to obtain a second quality metric. The quality metric for the second far-end combined signal is normalized, based on the first quality metric, to obtain a performance index for the device.
    Type: Application
    Filed: January 17, 2017
    Publication date: December 6, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventor: Doh-Suk KIM
  • Publication number: 20180287918
    Abstract: This disclosure falls into the field of voice communication systems, more specifically it is related to the field of voice quality estimation in a packet based voice communication system. In particular the disclosure provides methods, computer program products and devices for reducing a prediction error of the voice quality estimation by considering forward error correction of lost voice packets.
    Type: Application
    Filed: May 5, 2016
    Publication date: October 4, 2018
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventor: Doh-Suk KIM
  • Patent number: 9917945
    Abstract: A voice quality estimation process may be triggered by receiving one or more alarms corresponding to one or more endpoint terminals being used during a teleconference. The alarm(s) may include uplink transmission alarms, downlink transmission alarms and/or acoustic quality alarms. The alarms may be based on evaluating transmission metrics and/or acoustic quality metrics. The voice quality estimation process may require a relatively greater computational burden than the processes of evaluating the transmission metrics and/or acoustic quality metrics for the purpose of potentially triggering an alarm. The accuracy and computational complexity of voice quality estimation may be adjusted by selecting times during which alarm detection will take place, alarm detector thresholds, alarm analyzer thresholds and/or levels of voice quality estimation.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: March 13, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Doh-Suk Kim, Jean-Francois Catz
  • Patent number: 9917952
    Abstract: Example embodiments disclosed herein relate to an evaluation of perceptual delay impact on a conversation. A method of evaluating perceptual delay impact on a conversation is disclosed. The method includes detecting a conversational event between a first participant and a second participant, the conversational event including a plurality of speech segments; in response to the conversational event being detected, obtaining at least one conversational parameter for the first and second participants, the at least one conversational parameter indicating a relationship between the plurality of speech segments in the conversational event; and determining a quality of the conversation according to a model based on the at least one conversational parameter, the model characterizing the quality with the at least one conversational parameter. A method of obtaining a model for evaluating perceptual delay impact on a conversation is also disclosed. Corresponding systems and computer program products are also disclosed.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: March 13, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Kai Li, Doh-Suk Kim
  • Publication number: 20180013879
    Abstract: This disclosure falls into the field of voice communication systems, more specifically it is related to the field of voice quality estimation in a packet based voice communication system. In particular the disclosure provides a method and device for 5 reducing a prediction error of the voice quality estimation by considering the content of lost packets. Furthermore, this disclosure provides a method and device which uses a voice quality estimating algorithm to calculate the voice quality estimate based on an input which is switchable between a first and a second input mode.
    Type: Application
    Filed: December 23, 2015
    Publication date: January 11, 2018
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Doh-Suk KIM, Shen HUANG
  • Publication number: 20170289357
    Abstract: Example embodiments disclosed herein relate to an evaluation of perceptual delay impact on a conversation. A method of evaluating perceptual delay impact on a conversation is disclosed. The method includes detecting a conversational event between a first participant and a second participant, the conversational event including a plurality of speech segments; in response to the conversational event being detected, obtaining at least one conversational parameter for the first and second participants, the at least one conversational parameter indicating a relationship between the plurality of speech segments in the conversational event; and determining a quality of the conversation according to a model based on the at least one conversational parameter, the model characterizing the quality with the at least one conversational parameter. A method of obtaining a model for evaluating perceptual delay impact on a conversation is also disclosed. Corresponding systems and computer program products are also disclosed.
    Type: Application
    Filed: March 30, 2017
    Publication date: October 5, 2017
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Kai LI, Doh-Suk KIM
  • Patent number: 9749474
    Abstract: A system and method of matching reverberation in teleconferencing environments. When the two ends of a conversation are in environments with differing reverberations, the method filters the reverberation so that when both signals are output at the near end (e.g., the audio signal from the far end and the sidetone from the near end), the reverberations match. In this manner, the user does not perceive an annoying difference in reverberations, and the user experience is improved.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: August 29, 2017
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Doh-Suk Kim, Gary Spittle
  • Publication number: 20170104867
    Abstract: A voice quality estimation process may be triggered by receiving one or more alarms corresponding to one or more endpoint terminals being used during a teleconference. The alarm(s) may include uplink transmission alarms, downlink transmission alarms and/or acoustic quality alarms. The alarms may be based on evaluating transmission metrics and/or acoustic quality metrics. The voice quality estimation process may require a relatively greater computational burden than the processes of evaluating the transmission metrics and/or acoustic quality metrics for the purpose of potentially triggering an alarm. The accuracy and computational complexity of voice quality estimation may be adjusted by selecting times during which alarm detection will take place, alarm detector thresholds, alarm analyzer thresholds and/or levels of voice quality estimation.
    Type: Application
    Filed: June 15, 2015
    Publication date: April 13, 2017
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Doh-Suk KIM, Jean-Francois CATZ
  • Publication number: 20160359943
    Abstract: A service request for communication services for communication clients is received. In response, a communication service network is set up to support the communication services. Routing metadata is generated for each of the communication clients. The routing metadata is to be used by each of the communication clients for sharing service quality information with a respective peer communication client over a light-weight peer-to-peer (P2P) network. The routing metadata is downloaded to each of the communication clients. A communication client may exchange service signaling packets or service data packets over the communication service network. When the communication client determines that there is a problematic region in a bitstream received from the communication server, the communication client can request a peer communication client for a service quality information portion related to the problematic region.
    Type: Application
    Filed: June 1, 2016
    Publication date: December 8, 2016
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Shen HUANG, Doh-Suk KIM, Xuejing SUN
  • Publication number: 20160323454
    Abstract: A system and method of matching reverberation in teleconferencing environments. When the two ends of a conversation are in environments with differing reverberations, the method filters the reverberation so that when both signals are output at the near end (e.g., the audio signal from the far end and the sidetone from the near end), the reverberations match. In this manner, the user does not perceive an annoying difference in reverberations, and the user experience is improved.
    Type: Application
    Filed: July 12, 2016
    Publication date: November 3, 2016
    Inventors: Doh-Suk Kim, Gary Spittle
  • Patent number: 9426300
    Abstract: A system and method of matching reverberation in teleconferencing environments. When the two ends of a conversation are in environments with differing reverberations, the method filters the reverberation so that when both signals are output at the near end (e.g., the audio signal from the far end and the sidetone from the near end), the reverberations match. In this manner, the user does not perceive an annoying difference in reverberations, and the user experience is improved.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: August 23, 2016
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Doh-Suk Kim, Gary Spittle
  • Publication number: 20150092950
    Abstract: A system and method of matching reverberation in teleconferencing environments. When the two ends of a conversation are in environments with differing reverberations, the method filters the reverberation so that when both signals are output at the near end (e.g., the audio signal from the far end and the sidetone from the near end), the reverberations match. In this manner, the user does not perceive an annoying difference in reverberations, and the user experience is improved.
    Type: Application
    Filed: September 18, 2014
    Publication date: April 2, 2015
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Doh-Suk Kim, Gary Spittle
  • Patent number: 8880412
    Abstract: An apparatus comprising an ingress port configured to receive a signal comprising a plurality of encoded audio signals corresponding to a plurality of sources; and a processor coupled to the ingress port and configured to calculate a parameter for each of the plurality of encoded audio signals, wherein each parameter is calculated without decoding any of the encoded audio signals, select some, but not all, of the plurality of encoded audio signals according to the parameter for each of the encoded audio signals, decode the selected signals to generate a plurality of decoded audio signals, and combine the plurality of decoded audio signals into a first audio signal.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: November 4, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventor: Doh-Suk Kim
  • Publication number: 20130151242
    Abstract: An apparatus comprising an ingress port configured to receive a signal comprising a plurality of encoded audio signals corresponding to a plurality of sources; and a processor coupled to the ingress port and configured to calculate a parameter for each of the plurality of encoded audio signals, wherein each parameter is calculated without decoding any of the encoded audio signals, select some, but not all, of the plurality of encoded audio signals according to the parameter for each of the encoded audio signals, decode the selected signals to generate a plurality of decoded audio signals, and combine the plurality of decoded audio signals into a first audio signal.
    Type: Application
    Filed: December 13, 2011
    Publication date: June 13, 2013
    Applicant: Futurewei Technologies, Inc.
    Inventor: Doh-Suk Kim