Patents by Inventor David Chaohua Wu
David Chaohua Wu 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: 11900897Abstract: A system and method are provided to generate blended video and graphics using a blending domain. The system converts video from a first domain to a blending domain. The system converts graphics from a second domain to the blending domain and blends the video and graphics in the blending domain to generate a blended output.Type: GrantFiled: July 20, 2022Date of Patent: February 13, 2024Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITEDInventors: David Chaohua Wu, Richard Hayden Wyman
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Publication number: 20220358896Abstract: A system and method are provided to generate blended video and graphics using a blending domain. The system converts video from a first domain to a blending domain. The system converts graphics from a second domain to the blending domain and blends the video and graphics in the blending domain to generate a blended output.Type: ApplicationFiled: July 20, 2022Publication date: November 10, 2022Inventors: David Chaohua WU, Richard Hayden WYMAN
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Patent number: 11430406Abstract: A system and method are provided to generate blended video and graphics using a blending domain. The system converts video from a first domain to a blending domain. The system converts graphics from a second domain to the blending domain and blends the video and graphics in the blending domain to generate a blended output.Type: GrantFiled: February 1, 2021Date of Patent: August 30, 2022Assignee: Avago Technologies International Sales Pte. LimitedInventors: David Chaohua Wu, Richard Hayden Wyman
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Publication number: 20210151003Abstract: A system and method are provided to generate blended video and graphics using a blending domain. The system converts video from a first domain to a blending domain. The system converts graphics from a second domain to the blending domain and blends the video and graphics in the blending domain to generate a blended output.Type: ApplicationFiled: February 1, 2021Publication date: May 20, 2021Inventors: David Chaohua Wu, Richard Hayden Wyman
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Patent number: 10909949Abstract: A system and method are provided to generate blended video and graphics using a blending domain. The system converts video from a first domain to a blending domain. The system converts graphics from a second domain to the blending domain and blends the video and graphics in the blending domain to generate a blended output.Type: GrantFiled: June 10, 2016Date of Patent: February 2, 2021Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITEDInventors: David Chaohua Wu, Richard Hayden Wyman
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Patent number: 9985996Abstract: A device for decoupling audio-video (AV) traffic processing from non-AV traffic processing may include a first processor and a second processor. The first processor may be configured to establish a network connection with a client device, determine whether the network connection is associated with AV traffic, transfer the network connection to a second processor when the network connection is associated with AV traffic, and process non-AV traffic associated with the network connection when the network connection is not associated with AV traffic. The second processor may be configured to receive the network connection from the first processor and process the AV traffic associated with the network connection.Type: GrantFiled: January 9, 2014Date of Patent: May 29, 2018Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.Inventors: Rajesh Shankarrao Mamidwar, Darren Duane Neuman, Flaviu Dorin Turean, David ChaoHua Wu, Anand Tongle, Sanjeev Sood, Prashant Katre, Predrag Kostic
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Publication number: 20160365065Abstract: A system and method are provided to generate blended video and graphics using a blending domain. The system converts video from a first domain to a blending domain. The system converts graphics from a second domain to the blending domain and blends the video and graphics in the blending domain to generate a blended output.Type: ApplicationFiled: June 10, 2016Publication date: December 15, 2016Inventors: David Chaohua Wu, Richard Hayden Wyman
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Publication number: 20150082337Abstract: A system for pipelined encryption and packetization of audio video (AV) data may consecutively encrypt a number of AV data units based on a security mechanism, associate the encrypted AV data units with a security header, where the security header is generated before the AV data units are encrypted, and the security header includes information related to the security mechanism, generate network packets for transporting the encrypted AV data units and the associated security header based at least in part on an order in which the AV data units are encrypted, where one or more of the network packets is generated contemporaneous with encrypting one or more of the AV data units, and provide the network packets for transport to a client device as the packets are generated, where the AV data units are encrypted and the network packets are generated without accessing memory external to the system.Type: ApplicationFiled: November 27, 2013Publication date: March 19, 2015Applicant: Broadcom CorporationInventors: Rajesh Shankarrao MAMIDWAR, Francis Chi-Wai Cheung, Sanjeev Sood, Prashant Katre, Flaviu Dorin Turean, Anand Tongle, David ChaoHua Wu, Ming Chet Liew
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Publication number: 20150071296Abstract: A device for decoupling audio-video (AV) traffic processing from non-AV traffic processing may include a first processor and a second processor. The first processor may be configured to establish a network connection with a client device, determine whether the network connection is associated with AV traffic, transfer the network connection to a second processor when the network connection is associated with AV traffic, and process non-AV traffic associated with the network connection when the network connection is not associated with AV traffic. The second processor may be configured to receive the network connection from the first processor and process the AV traffic associated with the network connection.Type: ApplicationFiled: January 9, 2014Publication date: March 12, 2015Applicant: BROADCOM CORPORATIONInventors: Rajesh Shankarrao MAMIDWAR, Darren Duane NEUMAN, Flaviu Dorin TUREAN, David ChaoHua WU, Anand TONGLE, Sanjeev SOOD, Prashant KATRE, Predrag KOSTIC
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Patent number: 8089377Abstract: A method and apparatus are disclosed for performing sampling rate conversion of an audio signal from a first sampling rate to any of a plurality of higher sampling rates using a single set of low-pass filter coefficients. Sampling rate conversion is accomplished by effectively up-sampling, low-pass filtering, and down-sampling the audio signal to generate interpolated output samples of a second digital audio signal at any of a plurality of sampling rates. The sampling rate conversion process includes storing a fixed set of filter coefficients as a plurality of phased subsets of filter coefficients, applying samples of the audio signal to the phased subsets in a rotational manner to generate filtered samples of the audio signal, and selecting and linear interpolating between certain filtered samples to generate samples of the second digital audio signal.Type: GrantFiled: August 7, 2007Date of Patent: January 3, 2012Assignee: Broadcom CorporationInventors: David Chaohua Wu, Sheng Zhong
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Patent number: 8050412Abstract: A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient value for a scaling that reduces stereo separation due to amplitude variation of the right and left channel signal values. The preferred coefficient value is thereafter used for scaling the right and left channel signal values.Type: GrantFiled: December 14, 2004Date of Patent: November 1, 2011Assignee: Broadcom CorporationInventor: David Chaohua Wu
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Publication number: 20110211658Abstract: A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Each subsequent stage of the digital multi-channel decoding process is performed at the lowest sampling rate that yields acceptable performance for that stage. Analog-to-digital conversion of the composite audio signal is performed first to generate a composite digital audio signal. After analog-to-digital conversion, all signal processing may be performed in the digital domain. The composite digital audio signal is digitally filtered to frequency compensate for variations caused by previous stages of processing, including IF demodulation. Digital channel demodulation and filtering are performed to isolate single channels of the composite digital audio signal such as SAP, L?R, and L+R channels.Type: ApplicationFiled: March 22, 2011Publication date: September 1, 2011Inventors: David Chaohua Wu, Hoang Nhu, Russ Lambert, Alexander G. MacInnis, Ronald Crochiere
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Patent number: 7912153Abstract: A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Each subsequent stage of the digital multi-channel decoding process is performed at the lowest sampling rate that yields acceptable performance for that stage. Analog-to-digital conversion of the composite audio signal is performed first to generate a composite digital audio signal. After analog-to-digital conversion, all signal processing may be performed in the digital domain. The composite digital audio signal is digitally filtered to frequency compensate for variations caused by previous stages of processing, including IF demodulation. Digital channel demodulation and filtering are performed to isolate single channels of the composite digital audio signal such as SAP, L?R, and L+R channels.Type: GrantFiled: June 27, 2006Date of Patent: March 22, 2011Inventors: David Chaohua Wu, Hoang Nhu, Russ Lambert, Alexander G. MacInnis, Ronald Crochiere
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Patent number: 7650125Abstract: Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator for demodulating the SAP signal using the phase shifted SAP signal and a delayed SAP signal, and a lowpass filter to eliminate noise from the FM demodulated SAP signal. The system may also include an automatic gain control for normalizing amplitude of FM demodulator input signals. The digital FM demodulator uses a simplified approximation using non-unity delay for simplified demodulation of frequency modulated signals.Type: GrantFiled: November 23, 2005Date of Patent: January 19, 2010Assignee: Broadcom CorporationInventors: David Chaohua Wu, Russ Lambert
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Patent number: 7515889Abstract: A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value, a left channel signal value and a pilot signal having an amplitude. A DSP (60) recursively finds a coefficient value for scaling that keeps the pilot signal amplitude within a range of values, there by improving baseband signal quality, such as stereo separation of stereo signals within the baseband signals.Type: GrantFiled: December 14, 2004Date of Patent: April 7, 2009Assignee: Broadcom CorporationInventor: David Chaohua Wu
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Patent number: 7253753Abstract: A method and apparatus are disclosed for performing sampling rate conversion of an audio signal from a first sampling rate to any of a plurality of higher sampling rates using a single set of low-pass filter coefficients. Sampling rate conversion is accomplished by effectively up-sampling, low-pass filtering, and down-sampling the audio signal to generate interpolated output samples of a second digital audio signal at any of a plurality of sampling rates. The sampling rate conversion process includes storing a fixed set of filter coefficients as a plurality of phased subsets of filter coefficients, applying samples of the audio signal to the phased subsets in a rotational manner to generate filtered samples of the audio signal, and selecting and linear interpolating between certain filtered samples to generate samples of the second digital audio signal.Type: GrantFiled: February 26, 2002Date of Patent: August 7, 2007Assignee: Broadcom CorporationInventors: David Chaohua Wu, Sheng Zhong
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Patent number: 7079657Abstract: A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Analog-to-digital conversion is performed on a composite analog audio signal at a fast clock rate to generate a composite digital audio signal at a first sample rate. Digital frequency compensation is performed on the composite digital audio signal at the first sample rate to generate a compensated composite audio signal. Digital channel demodulation and filtering are performed on the compensated composite audio signal at the first sample rate to generate a first single channel audio signal at a second sample rate.Type: GrantFiled: February 26, 2002Date of Patent: July 18, 2006Assignee: Broadcom CorporationInventors: David Chaohua Wu, Hoang Nhu, Russ Lambert, Alexander G. MacInnis, Ronald Crochiere
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Patent number: 7006806Abstract: Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator for demodulating the SAP signal using the phase shifted SAP signal and a delayed SAP signal, and a lowpass filter to eliminate noise from the FM demodulated SAP signal. The system may also include an automatic gain control for normalizing amplitude of FM demodulator input signals. The digital FM demodulator uses a simplified approximation using non-unity delay for simplified demodulation of frequency modulated signals.Type: GrantFiled: February 26, 2002Date of Patent: February 28, 2006Assignee: Broadcom CorporationInventors: David Chaohua Wu, Russ Lambert
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Patent number: 6859238Abstract: A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient value for a scaling that reduces stereo separation due to amplitude variation of the right and left channel signal values. The preferred coefficient value is thereafter used for scaling the right and left channel signal values.Type: GrantFiled: February 26, 2002Date of Patent: February 22, 2005Assignee: Broadcom CorporationInventor: David Chaohua Wu
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Patent number: 6832078Abstract: A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value, a left channel signal value and a pilot signal having an amplitude. A DSP (60) recursively finds a coefficient value for scaling that keeps the pilot signal amplitude within a range of values, there by improving baseband signal quality, such as stereo separation of stereo signals within the baseband signals.Type: GrantFiled: February 26, 2002Date of Patent: December 14, 2004Assignee: Broadcom CorporationInventor: David Chaohua Wu