Patents by Inventor Tao Tian
Tao Tian 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: 8750387Abstract: Adaptive video encoding and decoding methods and apparatuses for encoder-assisted frame rate up-conversion (EA-FRUC) are described herein. An encoder selectively encodes at least a portion of a video frame, such as a block, using an interpolated FRUC frame as a reference. The encoder interpolates at least a portion of the FRUC frame at the same time instance as the yet to be encoded video frame, and selects one of a plurality of FRUC encoding modes for that portion, e.g., based on rate distortion (RD). The encoder encodes the frame using the selected FRUC encoding mode, the FRUC reference frame, and any additional reference frames that may be indicated. A decoder interpolates the FRUC frame and uses it for decoding with knowledge of the particular FRUC mode that was used by the encoder. The encoder communicates the FRUC mode for a block via one or more existing parameters in the encoded video frame.Type: GrantFiled: November 10, 2006Date of Patent: June 10, 2014Assignee: Qualcomm IncorporatedInventors: Tao Tian, Fang Shi, Vijayalakshmi R. Raveendran
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Patent number: 8687540Abstract: A device for generating a pilot signal for use in a wireless repeater where the pilot signal is added to a transmit signal for transmission includes a pilot power control unit configured to set a power level of the pilot signal as a function of a gain of the repeater and a power level of the transmit signal, where the function comprises a linear or non-linear function. In one embodiment, the operation of the repeater may be divided into gain regions and the inserted pilot power is controlled according to the different gain regions of the repeater. When the repeater gain is low, the pilot power may be set greater than the transmit power to ensure there is sufficient signal to use for channel estimation. When the repeater gain is in steady state, the pilot power may be set to be lower than the transmit power to avoid interference.Type: GrantFiled: June 7, 2011Date of Patent: April 1, 2014Assignee: QUALCOMM IncorporatedInventors: Michael Mao Wang, Gwendolyn Denise Barriac, Dhananjay Ashok Gore, Tao Tian
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Patent number: 8654848Abstract: The invention comprises devices and methods for processing multimedia data. Such methods can include obtaining at least one metric indicative of a difference for a selected frame and adjacent frames in a plurality of video frames, the metric comprising bi-directional motion information and luminance difference information, determining a shot event in the selected frame based on the at least one metric, and adaptively encoding the selected frame based on the shot event. An apparatus for processing a multimedia data can include a motion compensator configured to obtain metrics indicative of a difference between adjacent frames of a plurality of video frames, said metrics comprising bi-directional motion information and luminance information, a shot classifier configured to determine a shot event in the plurality of video frames based on said metrics, and an encoder configured to adaptively encode the plurality of frames based on the shot event.Type: GrantFiled: October 3, 2006Date of Patent: February 18, 2014Assignee: QUALCOMM IncorporatedInventors: Tao Tian, Gordon Kent Walker, Vijayalakshmi R. Raveendran
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Patent number: 8638835Abstract: A wireless repeater incorporates a gain management block to implement a multi-parameter gain management algorithm. The gain management algorithm receives gain settings from at least a gain control metric for stability and output signal quality and signal headroom values associated with circuitry of the repeater. The gain management block provides secure and robust boot-up of the repeater as well as oscillation detection and prevention. Furthermore, the gain management block implements repeater stability control, output signal-to-noise level control, uplink and downlink gain balance control and compensation for device constraints.Type: GrantFiled: December 6, 2011Date of Patent: January 28, 2014Assignee: Qualcomm IncorporatedInventors: Michael Mao Wang, Gwendolyn Denise Barriac, Dhananjay Ashok Gore, Tao Tian
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Patent number: 8640012Abstract: Received communication signals may be decoded according to a combined, iterative inner code—outer code decoding technique. The inner code decoding is based on information produced by the outer code decoding.Type: GrantFiled: April 27, 2009Date of Patent: January 28, 2014Assignee: QUALCOMM IncorporatedInventors: Fuyun Ling, Thomas Sun, Tao Tian, Raghuraman Krishnamoorthi, Jing Jiang
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Patent number: 8612498Abstract: Methods and apparatus to process multimedia data enabling faster channel acquisitions, improved error recovery and improved efficiency. An encoder device encodes a first portion of multimedia data using inter-coding to generate a first version, and encodes the first portion of multimedia data using intra-coding to generate a second version. A decoder device receives a first version of a first portion of multimedia data, wherein the first version is inter-coded, receives a second version of the first portion of multimedia data, wherein the second version is intra-coded, and selectively decodes the first and second received versions.Type: GrantFiled: July 19, 2012Date of Patent: December 17, 2013Assignee: QUALCOMM, IncorporatedInventors: Gordon Kent Walker, Vijayalakshmi R. Raveendran, Peisong Chen, Tao Tian, Fang Shi, Scott T. Swazey, Seyfullah Halit Oguz, Amit Rohatgi, Sitaraman Ganapathy Subramanian, Phanikumar Bhamidipati
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Patent number: 8565301Abstract: Methods and apparatus efficiently encode multimedia data, such as live video streams. An encoding complexity of a predetermined time interval, such as 1 second, is estimated before the actual encoding that will be used. This permits the actual encoding to be performed with an a priori estimate of complexity, permitting the bits allocated for the predetermined time interval (bit rate) to be efficiently allocated within the predetermined time interval. Moreover, the estimated complexity can be provided to a device, such as a multiplexer, which can then allocate the available bandwidth for a collection of multiplexed video channels according to the encoding complexity anticipated for those video channels, which then permits the quality of a particular channel to remain relatively constant even when the bandwidth for the collection of multiplexed video channels is relatively constant.Type: GrantFiled: March 10, 2006Date of Patent: October 22, 2013Assignee: QUALCOMM IncorporatedInventors: Tao Tian, Peisong Chen, Vijayalakshmi R. Raveendran
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Publication number: 20130266086Abstract: Systems and methods for using travelling pilots for channel estimation are described herein. In one aspect, wireless communications apparatus is described that comprises a processor configured to divide a plurality of tones on which pilot signals are to be transmitted among a plurality of symbols, wherein each symbol includes less than all of the plurality of tones and the plurality of symbols includes at least a subset of the plurality of tones. The wireless communication apparatus further comprises a transmitter configured to transmit, during a given symbol, pilot signals on the tones included in the given symbol, wherein the tones over which the pilot signals are transmitted are changed from symbol to symbol.Type: ApplicationFiled: December 6, 2012Publication date: October 10, 2013Applicant: Qualcomm IncorporatedInventors: Lin Yang, Didier Johannes Richard Van Nee, Hemanth Sampath, Sameer Vermani, Tao Tian
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Publication number: 20130143483Abstract: A wireless repeater in a multi-repeater environment operates to detect the presence of neighboring repeaters and to maintain repeater stability in the presence of a neighboring repeater. In some embodiments, the repeater transmits a known signal sequence to discover the presence of a neighboring repeater. When a neighboring repeater is detected, the repeater may apply mitigation measures to maintain operational stability at the repeater.Type: ApplicationFiled: December 6, 2011Publication date: June 6, 2013Applicant: QUALCOMM IncorporatedInventors: Dhananjay Ashok Gore, Gwendolyn Denise Barriac, Tao Tian, Michael Mao Wang, James Arthur Proctor, JR., Kenneth M. Gainey
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Publication number: 20130142222Abstract: A wireless repeater incorporates a gain management block to implement a multi-parameter gain management algorithm. The gain management algorithm receives gain settings from at least a gain control metric for stability and output signal quality and signal headroom values associated with circuitry of the repeater. The gain management block provides secure and robust boot-up of the repeater as well as oscillation detection and prevention. Furthermore, the gain management block implements repeater stability control, output signal-to-noise level control, uplink and downlink gain balance control and compensation for device constraints.Type: ApplicationFiled: December 6, 2011Publication date: June 6, 2013Applicant: QUALCOMM IncorporatedInventors: Michael Mao Wang, Gwendolyn Denise Barriac, Dhananjay Ashok Gore, Tao Tian
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Patent number: 8446954Abstract: This disclosure describes techniques for improving mode selection decisions during the encoding of macroblocks (or other blocks) of multimedia frames of a multimedia sequence. During motion estimation, the encoding modes for macroblocks can be determined so that a desirable encoding rate and acceptable levels of distortion (i.e., acceptable rate-distortion) can be achieved. The techniques may include selecting a set of multimedia coding modes between at least two sets of possible multimedia coding modes for a macroblock of a multimedia frame based on a detail metric associated with the macroblock and mode information associated with neighboring blocks to the macroblock.Type: GrantFiled: August 23, 2006Date of Patent: May 21, 2013Assignee: QUALCOMM IncorporatedInventors: Tao Tian, Vijayalakshmi R. Raveendran
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Patent number: 8443255Abstract: A method of generating a parity check matrix for iterative decoding of a linear block code includes: determining a set of parity check vectors for the linear block code; ordering according to Hamming weight non-zero parity check vectors of the set; selecting a criterion for generating the parity check matrix; and building the parity check matrix by incrementally selecting according to the criterion a parity check vector for each consecutive row of the parity check matrix, wherein the parity check vector is selected from the ordered non-zero parity check vectors remaining in the set.Type: GrantFiled: August 26, 2010Date of Patent: May 14, 2013Assignee: Qualcomm IncorporatedInventors: Jing Jiang, Tao Tian, Raghuraman Krishnamoorthi, Xinmiao Zhang, Ashok Mantravadi, Krishna Mukkavilli
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Patent number: 8380122Abstract: A wireless repeater includes a channel estimation block to estimate a feedback channel between the antennas of the repeater using frequency domain channel estimation. The repeater includes a pilot signal blanking circuit to blank out a selected number of samples of the pilot signal to improve the accuracy of the channel estimation. In another embodiment, the repeater replaces T samples of the pilot signal with a cyclic prefix.Type: GrantFiled: February 18, 2010Date of Patent: February 19, 2013Assignee: QUALCOMM IncorporatedInventors: Steven J. Howard, Tadeusz Jarosinski, Dhananjay Ashok Gore, Gwendolyn Denise Barriac, Michael Mao Wang, Tao Tian
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Publication number: 20130034128Abstract: A wireless repeater introduces a low level noise to the signal path of the repeater where the introduced noise is used to facilitate channel estimation. The introduced low power level noise may be added to the receive signal or to the transmit signal. The low power noise signal ensures that the repeater always has a reference signal for performing channel estimation, even when the repeater is not receiving any incoming signal traffic. In one embodiment, a low noise signal is inserted to the transmit circuit of the repeater. In another embodiment, the repeater is configured to increase the noise figure of the receive circuit where the detected noise figure acts as a receive signal.Type: ApplicationFiled: August 5, 2011Publication date: February 7, 2013Applicant: QUALCOMM INCORPORATEDInventors: Dhananjay Ashok Gore, Gwendolyn Denise Barriac, Michael Mao Wang, Tao Tian
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Publication number: 20120314646Abstract: A device for generating a pilot signal for use in a wireless repeater where the pilot signal is added to a transmit signal for transmission includes a pilot power control unit configured to set a power level of the pilot signal as a function of a gain of the repeater and a power level of the transmit signal, where the function comprises a linear or non-linear function. In one embodiment, the operation of the repeater may be divided into gain regions and the inserted pilot power is controlled according to the different gain regions of the repeater. When the repeater gain is low, the pilot power may be set greater than the transmit power to ensure there is sufficient signal to use for channel estimation. When the repeater gain is in steady state, the pilot power may be set to be lower than the transmit power to avoid interference.Type: ApplicationFiled: June 7, 2011Publication date: December 13, 2012Applicant: QUALCOMM IncorporatedInventors: Michael Mao Wang, Gwendolyn Denise Barriac, Dhananjay Ashok Gore, Tao Tian
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Patent number: 8325856Abstract: An acquisition module includes a coherent correlator configured to receive a transmission having a pilot signal and correlate the received transmission with a local copy of the pilot signal to produce a first output, a delayed correlator configured to delay the first output and correlate the first output with the delayed first output to produce a second output, and a detector configured to detect the pilot signal in the transmission based on the second output.Type: GrantFiled: September 24, 2007Date of Patent: December 4, 2012Assignee: QUALCOMM IncorporatedInventors: Raghuraman Krishnamoorthi, Tao Tian, Fuyun Ling, Yuheng Huang
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Publication number: 20120294360Abstract: Methods and apparatus to process multimedia data enabling faster channel acquisitions, improved error recovery and improved efficiency. An encoder device encodes a first portion of multimedia data using inter-coding to generate a first version, and encodes the first portion of multimedia data using intra-coding to generate a second version. A decoder device receives a first version of a first portion of multimedia data, wherein the first version is inter-coded, receives a second version of the first portion of multimedia data, wherein the second version is intra-coded, and selectively decodes the first and second received versions.Type: ApplicationFiled: July 19, 2012Publication date: November 22, 2012Applicant: QUALCOMM IncorporatedInventors: Gordon Kent Walker, Vijayalakshmi R. Raveendran, Peisong Chen, Tao Tian, Fang Shi, Scott T. Swazey, Seyfullah Halit Oguz, Amit Rohatgi, Sitaraman Ganapathy Subramanian, PhaniKumar Bhamidipati
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Patent number: 8285201Abstract: A wireless repeater having a receiving antenna for receiving an input signal and a transmitting antenna for transmitting an amplified signal includes first and second front-end circuits and a repeater baseband block coupled between the first and second front-end circuits. The repeater baseband block includes a channel estimation block, an echo canceller implementing time domain echo cancellation, a variable gain stage controlled by a gain control block implementing digital gain control, a first variable delay element introducing a first delay before or after the echo canceller, a second variable delay element introducing a second delay to the output signal. The delayed output signal is coupled to the channel estimation block as a reference signal for estimating the feedback channel, to the echo canceller as a reference signal for estimating the feedback signal, and to the gain control block for monitoring the stability of the repeater.Type: GrantFiled: October 30, 2009Date of Patent: October 9, 2012Assignee: QUALCOMM IncorporatedInventors: Dhananjay Ashok Gore, Gwendolyn Denise Barriac, James Arthur Proctor, Jr., Steven J. Howard, Hakan Inanoglu, Kenneth M. Gainey, Michael Mao Wang, Tao Tian
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Patent number: 8250428Abstract: Methods and systems are described for scheduling data in an FLO system. The method may include turbo encoding the data, and dividing a packet of the turbo-coded data into a plurality of subpackets. The method may include scheduling the turbo-coded packet of data so as to distribute the data across multiple frames of a superframe, by transmitting each one of the subpackets during a different frame of the superframe to increase time diversity. The turbo-coded packet of data may comprise systematic bits and parity bits. The method may include separately scheduling the systematic bits and the parity bits during different frames of the superframe.Type: GrantFiled: November 22, 2008Date of Patent: August 21, 2012Assignee: Qualcomm IncorporatedInventors: Thomas Sun, Fuyun Ling, Jing Jiang, Raghuraman Krishnamoorthi, Tao Tian, Kent Walker
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Patent number: 8249203Abstract: Methods and systems are described for processing a signal in wireless communications. The signal may have synchronization information. A method of processing a signal having synchronization information may include receiving the signal, and determining a truncation region of the time domain estimated channel, the estimated channel having taps. The method further includes processing the channel taps within the truncation region.Type: GrantFiled: September 22, 2008Date of Patent: August 21, 2012Assignee: QUALCOMM IncorporatedInventors: Thomas Sun, Raghuraman Krishnamoorthi, Fuyun Ling, Krishna Kiran Mukkavilli, Tao Tian, Bojan Vrcelj