Patents by Inventor David Su
David Su 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: 9160461Abstract: A frequency source, such as for a wireless communications device, configured to have a duty cycle adjustment. A selected harmonic spur resulting from operation of the frequency source at one duty cycle may be avoided or minimized by operating the frequency source at a second duty cycle. Determination of the appropriate duty cycle may be based on measuring the amplitude of the harmonic spur as it appears in the output of a receive chain of the wireless device. Alternatively, the duty cycle may be set to desired value to avoid or minimize a given harmonic.Type: GrantFiled: January 10, 2013Date of Patent: October 13, 2015Assignee: Qualcomm IncorporatedInventors: Justin A. Hwang, David Su
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Patent number: 9009253Abstract: A method for optimizing resources on a web server is provided. A web page may include areas for displaying content that is time consuming to retrieve. The content may be geographically far away or the content server itself may be slow. A caching proxy between the web server and the content server responds to requests for data immediately, with or without the data requested from the cache. On a cache miss, the caching proxy asynchronously retrieves data so that the next time the same content is requested, the data should be available in the cache. Asynchronous retrieval means that no valuable resources are tied up on the web server while waiting for the content to be provided from the content server. The initial web page sent from the web server to the web browser includes retry logic. The data may be retrieved from the cache during one of the retries.Type: GrantFiled: February 16, 2011Date of Patent: April 14, 2015Assignee: Yahoo! Inc.Inventors: Jayadev Chandrasekhar, David Su, Prasanna Padmanabhan, Nicholas Zakas, Okan Alper
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Publication number: 20140269462Abstract: A wake-up radio is configured to scan for transmissions while the radio receiver is in sleep mode. The wake-up radio detects incoming RF transmissions intended for the radio receiver by analyzing data frame characteristics in an incoming RF transmission. The data frame characteristics may contain a signature code that is unique to the radio receiver. The signature code may be based on the time duration of a sequence of orthogonal frequency division multiplex (OFDM) symbols received in a clear to send to self (CTS2S) transmission or a time duration of short interframe spaces (SIFS) used to transmit the data frames.Type: ApplicationFiled: March 12, 2013Publication date: September 18, 2014Applicant: QUALCOMM IncorporatedInventors: Zhanfeng Jia, David Su, Ning Zhang, Kai Shi
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Publication number: 20140194076Abstract: A frequency source, such as for a wireless communications device, configured to have a duty cycle adjustment. A selected harmonic spur resulting from operation of the frequency source at one duty cycle may be avoided or minimized by operating the frequency source at a second duty cycle. Determination of the appropriate duty cycle may be based on measuring the amplitude of the harmonic spur as it appears in the output of a receive chain of the wireless device. Alternatively, the duty cycle may be set to desired value to avoid or minimize a given harmonic.Type: ApplicationFiled: January 10, 2013Publication date: July 10, 2014Applicant: QUALCOMM INCORPORATEDInventors: Justin A. HWANG, David SU
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Patent number: 8767893Abstract: The present invention aims at eliminating the effects of frequency offsets between two transceivers by adjusting frequencies used during transmission. In this invention, methods for correcting the carrier frequency and the sampling frequency during transmission are provided, including both digital and analog implementations of such methods. The receiver determines the relative frequency offset between the transmitter and the receiver, and uses this information to correct this offset when the receiver transmits its data to the original transmitter in the return path, so that the signal received by the original transmitter is in sampling and carrier frequency lock with the original transmitter's local frequency reference.Type: GrantFiled: January 8, 2013Date of Patent: July 1, 2014Assignee: QUALCOMM IncorporatedInventors: Teresa H. Meng, David Su, Masoud Zargari
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Publication number: 20130202268Abstract: A blu-ray karaoke player includes a main housing and a central processing unit. The main housing has a vocal signal inlet for connecting to a microphone to obtain a vocal voice signal from a user, and a karaoke signal outlet for connecting to a display device and a speaker. The blu-ray player is supported in the main housing, and is adapted for reading a blu-ray disc for obtaining audio data and video data therefrom. The central processing unit is configured to decode the audio data and the video data obtained from the blu-ray disc, and process the vocal voice signal obtained from the microphone, and to output, through the karaoke signal outlet, the audio data, the vocal voice signal, and the video data to the display device and the speaker for allowing the user to perform karaoke activity through playing the blu-ray disc.Type: ApplicationFiled: February 3, 2012Publication date: August 8, 2013Inventor: David Su
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Patent number: 8363757Abstract: The present invention aims at eliminating the effects of frequency offsets between two transceivers by adjusting frequencies used during transmission. In this invention, methods for correcting the carrier frequency and the sampling frequency during transmission are provided, including both digital and analog implementations of such methods. The receiver determines the relative frequency offset between the transmitter and the receiver, and uses this information to correct this offset when the receiver transmits its data to the original transmitter in the return path, so that the signal received by the original transmitter is in sampling and carrier frequency lock with the original transmitter's local frequency reference.Type: GrantFiled: October 12, 1999Date of Patent: January 29, 2013Assignee: QUALCOMM IncorporatedInventors: Teresa H. Meng, David Su, Masoud Zargari
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Publication number: 20120209945Abstract: A method for optimizing resources on a web server is provided. A web page may include areas for displaying content that is time consuming to retrieve. The content may be geographically far away or the content server itself may be slow. A caching proxy between the web server and the content server responds to requests for data immediately, with or without the data requested from the cache. On a cache miss, the caching proxy asynchronously retrieves data so that the next time the same content is requested, the data should be available in the cache. Asynchronous retrieval means that no valuable resources are tied up on the web server while waiting for the content to be provided from the content server. The initial web page sent from the web server to the web browser includes retry logic. The data may be retrieved from the cache during one of the retries.Type: ApplicationFiled: February 16, 2011Publication date: August 16, 2012Inventors: Jayadev Chandrasekhar, David Su, Prasanna Padmanabhan, Nicholas Zakas, Okan Alper
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Patent number: 8204451Abstract: A transceiver for use in a wireless device. The transceiver may include a receive portion for receiving an input RF signal. The receive portion may include at least one receive filter which may include a first filter. The transceiver may also include a transmit portion for transmitting an output RF signal. The transmit portion may include at least one transmit filter, which may include the first filter used in the receive portion. The transceiver may further include a plurality of switches, which may include a first switch coupled to an input of the first filter and a second switch coupled to an output of the first filter. The plurality of switches may be configurable to enable use of the first filter in the receive portion for receiving the input RF signal and use of the first filter in the transmit portion for transmitting the output RF signal.Type: GrantFiled: July 30, 2008Date of Patent: June 19, 2012Assignee: QUALCOMM Atheros, Inc.Inventors: Alireza Kheirkhahi, Hirad Samavati, Srenik Mehta, David Su, Brian Kaczynski
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Publication number: 20110234905Abstract: A music mixer has an input component comprising a plurality of input sources to provide audio/video input signals; an audio/video processing component selectively receiving the input signals from the input component, processing and mixing the audio/video input signals to generate audio/video output signals and control information; and an output component outputting the audio/video output, wherein the output component further provides visual image of the video output signals and the control information.Type: ApplicationFiled: March 29, 2010Publication date: September 29, 2011Inventor: David Su
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Publication number: 20070280185Abstract: A dual band radio is constructed using a primary and secondary transceiver. The primary transceiver is a complete radio that is operational in a stand alone configuration. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain control and fine frequency stepping of the primary transceiver to produce operational frequencies of the secondary transceiver. The primary transceiver acts like an intermediate frequency device for the secondary transceiver. Switches are utilized to divert signals to/from the primary transceiver from/to the secondary transceiver. The switches are also configured to act as gain control devices. Antennas are selected using either wideband or narrowband antenna switches that are configured as a diode bridge having high impedance at operational frequencies on control lines that bias the diodes.Type: ApplicationFiled: June 26, 2007Publication date: December 6, 2007Applicant: Atheros Communications, Inc.Inventors: William McFarland, Keith Onedera, Arie Shor, David Su, Manolis Terrovitis, John Thomson, Masoud Zaragari
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Patent number: 7251459Abstract: A dual band radio is constructed using a primary and secondary transceiver. The primary transceiver is a complete radio that is operational in a stand alone configuration. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain control and fine frequency stepping of the primary transceiver to produce operational frequencies of the secondary transceiver. The primary transceiver acts like an intermediate frequency device for the secondary transceiver. Switches are utilized to divert signals to/from the primary transceiver from/to the secondary transceiver. The switches are also configured to act as gain control devices. Antennas are selected using either wideband or narrowband antenna switches that are configured as a diode bridge having high impedance at operational frequencies on control lines that bias the diodes.Type: GrantFiled: May 3, 2002Date of Patent: July 31, 2007Assignee: Atheros Communications, Inc.Inventors: William J. McFarland, Keith Onedera, Arie Shor, David Su, Manolis Terrovitis, John Thomson, Masoud Zaragari
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Publication number: 20070117523Abstract: Multiple power amplifiers in an RF front end are coupled to multiple antennas without diversity switching between the PAs and antennas. Diversity switches direct signals to broadcast by a selected antenna to a PA coupled to the selected antenna. Multiple LNAs are similarly coupled to the diverse antennas. Having one PA and LNA set for each antenna removes the need for diversity switching between the PA/LNAs and each antenna improving signal reception. In one embodiment, a single external PA performs broadcast functions and plural on-chip LNAs are used for reception. In another embodiment, phase shifters are coupled to each PA and LNA, which provide beam forming capability for broadcasts, and in phase signal combinations for received signals.Type: ApplicationFiled: January 18, 2007Publication date: May 24, 2007Inventors: David Weber, Manolis Terrovitis, David Su
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Patent number: 7212788Abstract: Multiple power amplifiers in an RF front end are coupled to multiple antennas without diversity switching between the PAs and antennas. Diversity switches direct signals to broadcast by a selected antenna to a PA coupled to the selected antenna. Multiple LNAs are similarly coupled to the diverse antennas. Having one PA and LNA set for each antenna removes the need for diversity switching between the PA/LNAs and each antenna improving signal reception. In one embodiment, a single external PA performs broadcast functions and plural on-chip LNAs are used for reception. In another embodiment, phase shifters are coupled to each PA and LNA, which provide beam forming capability for broadcasts, and in phase signal combinations for received signals.Type: GrantFiled: August 13, 2002Date of Patent: May 1, 2007Assignee: Atheros Communications, Inc.Inventors: David Weber, Manolis Terrovitis, David Su
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Publication number: 20070072561Abstract: Multiple power amplifiers in an RF front end are coupled to multiple antennas without diversity switching between the PAs and antennas. Diversity switches direct signals to broadcast by a selected antenna to a PA coupled to the selected antenna. Multiple LNAs are similarly coupled to the diverse antennas. Having one PA and LNA set for each antenna removes the need for diversity switching between the PA/LNAs and each antenna improving signal reception. In one embodiment, a single external PA performs broadcast functions and plural on-chip LNAs are used for reception. In another embodiment, phase shifters are coupled to each PA and LNA, which provide beam forming capability for broadcasts, and in phase signal combinations for received signals.Type: ApplicationFiled: November 13, 2006Publication date: March 29, 2007Inventors: David Weber, Manolis Terrovitis, David Su
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Patent number: 6850117Abstract: The present invention provides a breakdown resistant transistor structure for amplifying communication signals. This structure includes a first NMOS transistor having a source connected to ground and a first gate for receiving the input radio frequency signal. The first gate is disposed above a first insulator and the first NMOS transistor having a first transconductance and a first breakdown voltage associated therewith. Also included is a second NMOS transistor having a source connected to the drain of the first NMOS transistor, a gate connected to the reference DC voltage, and a drain that provides the output for the amplified radio signal, the load being disposed between the reference DC voltage and the drain of the second NMOS transistor. The second gate is disposed above a second insulator, the second NMOS transistor has a second transconductance and a second breakdown voltage associated therewith, and the second insulator may be thicker than the first insulator.Type: GrantFiled: January 7, 2003Date of Patent: February 1, 2005Assignee: Atheros Communications, Inc.Inventors: David J. Weber, Patrick Yue, David Su
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Publication number: 20050007202Abstract: The present invention provides a synthesizer having an efficient lock detect signal generator, an extended range VCO that can operate within any one of a plurality of adjacent characteristic curves defined by a plurality of adjacent regions, and a divide circuit implemented using only a single counter along with a decoder. This allows for a method of operating the synthesizer, methods of establishing or reestablishing a lock condition using the extended range VCO, and a method of designing a plurality of divide circuits which each use the same single counter and each use a different decoder.Type: ApplicationFiled: May 4, 2004Publication date: January 13, 2005Inventors: David Su, Chik Yue, David Weber, Masoud Zargari
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Publication number: 20040033787Abstract: Multiple power amplifiers in an RF front end are coupled to multiple antennas without diversity switching between the PAs and antennas. Diversity switches direct signals to broadcast by a selected antenna to a PA coupled to the selected antenna. Multiple LNAs are similarly coupled to the diverse antennas. Having one PA and LNA set for each antenna removes the need for diversity switching between the PA/LNAs and each antenna improving signal reception. In one embodiment, a single external PA performs broadcast functions and plural on-chip LNAs are used for reception. In another embodiment, phase shifters are coupled to each PA and LNA, which provide beam forming capability for broadcasts, and in phase signal combinations for received signals.Type: ApplicationFiled: August 13, 2002Publication date: February 19, 2004Inventors: David Weber, Manolis Terrovitis, David Su
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Publication number: 20030207668Abstract: A dual band radio is constructed using a primary and secondary transceiver. The primary transceiver is a complete radio that is operational in a stand alone configuration. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain control and fine frequency stepping of the primary transceiver to produce operational frequencies of the secondary transceiver. The primary transceiver acts like an intermediate frequency device for the secondary transceiver. Switches are utilized to divert signals to/from the primary transceiver from/to the secondary transceiver. The switches are also configured to act as gain control devices. Antennas are selected using either wideband or narrowband antenna switches that are configured as a diode bridge having high impedance at operational frequencies on control lines that bias the diodes.Type: ApplicationFiled: May 3, 2002Publication date: November 6, 2003Inventors: William J. McFarland, Keith Onedera, Arie Shor, David Su, Manolis Terrovitis, John Thomson, Masoud Zaragari
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Publication number: 20030172142Abstract: A method applicable under the circumstance of the Windows server is provided for building a virtual access point architecture (VAPA) by using a wireless-LAN interface card, which is installed to an Ethernet, such that a wireless network is coexisted with an Ethernet for sharing the Internet resources through the network address translator (NAT) and for mutual access of those two LANs through a WINS (Windows Internet Naming Service) server, in which some other wireless subscribers are connected through the Ad-Hoc framework.Type: ApplicationFiled: March 11, 2002Publication date: September 11, 2003Inventor: David Su