Patents by Inventor Beng Huat Chua
Beng Huat Chua 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: 10825471Abstract: A system uses a voice energy detection (VED) circuit along with a capture buffer for improved performance and lower power dissipation. With a VED assigned to each microphone in the system, combing the output of more than one VED to improve the detection probability or reduce the false alarm rate improves the post detection signal-to-noise ratio. One or more VED circuits are dynamically selected based on background energy and detection performance. Further, a digital VED algorithm dynamically changes the oversampling ratio (OSR) values and passband bandwidth as a function of the loudness of the background noise and desired signal levels. If the desired signal or noise is strong, then the OSR is reduced to save power. If desired speech is detected, then the OSR value increases to get the target SNR for the remaining audio processing needs.Type: GrantFiled: April 2, 2018Date of Patent: November 3, 2020Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITEDInventors: John Walley, Beng Huat Chua, VamshiKrishna Yakkala, Xin Jin
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Publication number: 20180293999Abstract: A system uses a voice energy detection (VED) circuit along with a capture buffer for improved performance and lower power dissipation. With a VED assigned to each microphone in the system, combing the output of more than one VED to improve the detection probability or reduce the false alarm rate improves the post detection signal-to-noise ratio. One or more VED circuits are dynamically selected based on background energy and detection performance. Further, a digital VED algorithm dynamically changes the oversampling ratio (OSR) values and passband bandwidth as a function of the loudness of the background noise and desired signal levels. If the desired signal or noise is strong, then the OSR is reduced to save power. If desired speech is detected, then the OSR value increases to get the target SNR for the remaining audio processing needs.Type: ApplicationFiled: April 2, 2018Publication date: October 11, 2018Applicant: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: John WALLEY, Beng Huat CHUA, VamshiKrishna YAKKALA, Xin JIN
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Patent number: 7680202Abstract: A communication system that transfers digital data on a fixed frequency channel of a radio frequency band in the presence of interference from at least one FHSS interference source includes a time diversity generation circuit. The time diversity circuit compacts a duration of data frames then replicate the time compressed data frames. The duplicated time compressed frames of data are transmitted to a communication receiver that has a time diversity data recovery circuit. The time diversity data recovery circuit buffers the received compressed and replicated data frames, evaluates whether each of the duplicated time compressed data frames are received correctly. If any one of the duplicated time compressed data frames is destroyed, the copy of the destroyed duplicated time compressed data frame is used to recover the data frame.Type: GrantFiled: November 8, 2005Date of Patent: March 16, 2010Assignee: FreeSystems Pte LtdInventors: Chee Oei Chan, Beng Huat Chua
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Patent number: 7555031Abstract: A receiver system that receives and recovers digital data on a fixed frequency channel of a radio frequency band in the presence of interference from at least one FHSS interference source. The digital data has a duration of data frames compacted then replicated to form duplicated time compressed data frames. The duplicated time compressed frames of data are transmitted to a communication receiver that has a time diversity data recovery circuit. The time diversity data recovery circuit buffers the received compressed and replicated data frames, evaluates whether each of the duplicated time compressed data frames are received correctly. If any one of the duplicated time compressed data frames is destroyed, the copy of the destroyed duplicated time compressed data frame is used to recover the data frame.Type: GrantFiled: November 8, 2005Date of Patent: June 30, 2009Assignee: FreeSystems Pte. Ltd.Inventors: Chee Oei Chan, Beng Huat Chua
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Patent number: 7551681Abstract: A transmitter system that transfers digital data on a fixed frequency channel of a radio frequency band in the presence of interference from at least one FHSS interference source includes a time diversity generation circuit. The time diversity circuit compacts a duration of data frames then replicate the time compressed data frames. The duplicated time compressed frames of data are transmitted to a communication receiver that has a time diversity data recovery circuit.Type: GrantFiled: November 8, 2005Date of Patent: June 23, 2009Assignee: Freesystems Pte. Ltd.Inventors: Chee Oei Chan, Beng Huat Chua
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Publication number: 20080181148Abstract: A serially linked digital data content relaying system that wirelessly transfers digital data content files such digital audio files, digital video files, or digital voice paging files includes a virtual serial network. The virtual serial network includes a master controller node device and multiple reproduction node devices. The master controller node device maintains digital data content files for distribution through the virtual serial network of the digital data content relaying system to the reproduction node devices. Each reproduction node device is serially in wireless communication two reproduction node devices that are in close proximity. A first reproduction node device of the plurality of reproduction node devices is in wireless communication with the master controller server to receive the digital data content files as radio frequency signals.Type: ApplicationFiled: January 8, 2008Publication date: July 31, 2008Inventors: Kah Yong Lee, Chee Oei Chan, Beng Huat Chua
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Patent number: 7236549Abstract: A diversity receiver system applying diversity to improve reception of coded data in presence of fading of the broadcast signal. The communication system includes a diversity receiver system receiving the coded data modulated broadcast signal from a transmission channel. The diversity receiver system has a signal acquisition device for evaluation of the signal characteristics of copies of the coded data modulated broadcast signal, extracting the coded data, control signals, and locking signals from the copies of the coded data. A diversity circuit selects one of the copies of the coded data modulated broadcast signals. An error evaluation circuit evaluates the coded data signal for errors and provides an error signal to the diversity circuit indicating an error state of the selected data, wherein the diversity circuit selects a second copy of the coded data modulated broadcast signal.Type: GrantFiled: July 3, 2003Date of Patent: June 26, 2007Assignee: FreeSystems Pte. LtdInventor: Beng Huat Chua
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Patent number: 6741659Abstract: A system for transmitting digitized samples of analog signals while concealing unrecoverable digitized samples of analog signals to maintain a level of fidelity in reproducing the analog signals. The digitized samples of the analog signals are burst transmitted such that the probability of interference with the transmission and thus corruption of the digitized samples of the analog signals is minimized. The digitized samples are received without synchronizing a receiving clock with a transmitting clock to capture the digitized samples of the analog signals. The digitized samples are converted from various sampling rates to digitized samples of the analog signals having a rate. Any large groups of digitized samples that are in error or corrupted in transmission are softly muted to avoid annoying clicks. Any long term difference between a transmit clock and a receive clock is tracked and the digitized samples are interpolated or decimated to eliminate any underrun or overrun of the digitized samples.Type: GrantFiled: October 25, 1999Date of Patent: May 25, 2004Assignee: FreeSystems Pte. Ltd.Inventors: Chee Oei Chan, Beng Huat Chua, Chee Kong Siew, Kah Yong Lee
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Patent number: 6671325Abstract: A system for transmitting, receiving, recovering, and reproducing digitized samples of analog signals while concealing unrecoverable digitized samples of analog signals to maintain a level of fidelity in reproducing the analog signals. The digitized samples of the analog signals are burst transmitted such that the probability of interference with the transmission and thus corruption of the digitized samples of the analog signals is minimized. The digitized samples are received without synchronizing a receiving clock with a transmitting clock to capture the digitized samples of the analog signals. The digitized samples are converted from various sampling rates to digitized samples of the analog signals having a rate. Any large groups of digitized samples that are in error or corrupted in transmission are softly muted to avoid annoying clicks.Type: GrantFiled: October 30, 2002Date of Patent: December 30, 2003Assignee: Free Systems Pte. Ltd.Inventors: Kah Yong Lee, Beng Huat Chua, Chee Oei Chan, Chee Kong Siew
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Patent number: 6614849Abstract: A system for transmitting, receiving, recovering, and reproducing digitized samples of analog signals while concealing unrecoverable digitized samples of analog signals to maintain a level of fidelity in reproducing the analog signals. The digitized samples of the analog signals are burst transmitted such that the probability of interference with the transmission and thus corruption of the digitized samples of the analog signals is minimized. The digitized samples are received without synchronizing a receiving clock with a transmitting clock to capture the digitized samples of the analog signals. The digitized samples are converted from various sampling rates to digitized samples of the analog signals having a rate. Any large groups of digitized samples that are in error or corrupted in transmission are softly muted to avoid annoying clicks.Type: GrantFiled: October 25, 1999Date of Patent: September 2, 2003Assignee: Free Systems Pte. Ltd.Inventors: Chee Oei Chan, Beng Huat Chua, Chee Kong Siew, Kah Yong Lee
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Publication number: 20030053548Abstract: A system for transmitting, receiving, recovering, and reproducing digitized samples of analog signals while concealing unrecoverable digitized samples of analog signals to maintain a level of fidelity in reproducing the analog signals. The digitized samples of the analog signals are burst transmitted such that the probability of interference with the transmission and thus corruption of the digitized samples of the analog signals is minimized. The digitized samples are received without synchronizing a receiving clock with a transmitting clock to capture the digitized samples of the analog signals. The digitized samples are converted from various sampling rates to digitized samples of the analog signals having a rate. Any large groups of digitized samples that are in error or corrupted in transmission are softly muted to avoid annoying clicks.Type: ApplicationFiled: October 30, 2002Publication date: March 20, 2003Applicant: Free Systems Pte., Ltd.Inventors: Kah Yong Lee, Beng Huat Chua, Chee Oei Chan, Chee Kong Siew