Patents by Inventor Hari Thirumoorthy
Hari Thirumoorthy 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: 8976849Abstract: A calibration signal generator for use in a balancing circuit calibration device in a radio receiver, the calibration signal generator comprising: a means of amplifying a clocking signal from a clocking signal generator to provide a first calibration signal; a means of generating a second calibration signal from the clocking signal, the first and second calibration signals being transmissible to a one or more mixing circuits in the balancing circuit calibration device; and a means synchronizing the operation of other circuit elements in the balancing circuit calibration device with the clocking signal; characterized in that the clocking signal generator is present in the radio receiver and used therein for other functions.Type: GrantFiled: January 22, 2007Date of Patent: March 10, 2015Assignee: Freescale Semiconductor, Inc.Inventors: Patrick Pratt, Hari Thirumoorthy, Conor O'Keeffe
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Patent number: 8233524Abstract: Embodiments include transceivers and transmit IQ imbalance correction methods. A transmitter lineup, which includes an equalizer and an RF modulator, receives a stream of baseband samples having real and imaginary components, processes the real components along a first channel, and processes the imaginary components along a second channel to produce processed real and imaginary components. The equalizer equalizes at least one of the processed real components and the processed imaginary components to compensate for offset frequency-dependent components of transmitter IQ imbalance. The RF modulator receives and modulates analog versions of the equalized samples, resulting in an analog RF signal. An embodiment also includes a balancer adapted to apply IQ gain and phase correction to the equalized samples to compensate for offset frequency-independent components of the transmitter IQ imbalance.Type: GrantFiled: March 12, 2009Date of Patent: July 31, 2012Assignee: Freescale Semiconductor, Inc.Inventor: Hari Thirumoorthy
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Publication number: 20110182335Abstract: A calibration signal generator for use in a balancing circuit calibration device in a radio receiver, the calibration signal generator comprising: a means of amplifying a clocking signal from a clocking signal generator to provide a first calibration signal; a means of generating a second calibration signal from the clocking signal, the first and second calibration signals being transmissible to a one or more mixing circuits in the balancing circuit calibration device; and a means synchronising the operation of other circuit elements in the balancing circuit calibration device with the clocking signal; characterised in that the clocking signal generator is present in the radio receiver and used therein for other functions.Type: ApplicationFiled: January 22, 2007Publication date: July 28, 2011Applicant: Freescale Semiconductor, Inc.Inventors: Patrick J. Pratt, Hari Thirumoorthy, Conor O'Keeffe
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Patent number: 7847177Abstract: Digital complex tone generators include a first tone generator configured to generate a first digital tone with selectable first characteristics including a first frequency, a first phase, and a first amplitude; a second tone generator configured to generate a second digital tone with selectable second characteristics including a second frequency, a second phase, and a second amplitude; and a generator adder configured for combining the first tone and the second tone to provide a digital complex tone with programmable characteristics. Corresponding methods include initializing a first and second tone generators based on, respective, selected frequencies, phases, and amplitudes; iteratively generating a first digital tone and a second digital tone; and combining these two tones to provide the digital complex tone.Type: GrantFiled: July 24, 2008Date of Patent: December 7, 2010Assignee: Freescale Semiconductor, Inc.Inventor: Hari Thirumoorthy
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Publication number: 20100232493Abstract: Embodiments include transceivers and transmit IQ imbalance correction methods. A transmitter lineup, which includes an equalizer and an RF modulator, receives a stream of baseband samples having real and imaginary components, processes the real components along a first channel, and processes the imaginary components along a second channel to produce processed real and imaginary components. The equalizer equalizes at least one of the processed real components and the processed imaginary components to compensate for offset frequency-dependent components of transmitter IQ imbalance. The RF modulator receives and modulates analog versions of the equalized samples, resulting in an analog RF signal. An embodiment also includes a balancer adapted to apply IQ gain and phase correction to the equalized samples to compensate for offset frequency-independent components of the transmitter IQ imbalance.Type: ApplicationFiled: March 12, 2009Publication date: September 16, 2010Applicant: FREESCALE SEMICONDUCTOR, INC.Inventor: Hari Thirumoorthy
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Publication number: 20100018383Abstract: Digital complex tone generators include a first tone generator configured to generate a first digital tone with selectable first characteristics including a first frequency, a first phase, and a first amplitude; a second tone generator configured to generate a second digital tone with selectable second characteristics including a second frequency, a second phase, and a second amplitude; and a generator adder configured for combining the first tone and the second tone to provide a digital complex tone with programmable characteristics. Corresponding methods include initializing a first and second tone generators based on, respective, selected frequencies, phases, and amplitudes; iteratively generating a first digital tone and a second digital tone; and combining these two tones to provide the digital complex tone.Type: ApplicationFiled: July 24, 2008Publication date: January 28, 2010Inventor: Hari Thirumoorthy
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Patent number: 7158632Abstract: A method, apparatus, and system for scaling a value of an amplitude to a binary value and a method, apparatus and system for reducing an undesirable portion of a signal.Type: GrantFiled: August 20, 2003Date of Patent: January 2, 2007Assignee: Intel CorporationInventor: Hari Thirumoorthy
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Patent number: 7148821Abstract: An apparatus and method of decoding variable length codes is provided. According to some embodiments, a method includes receiving a bitstream of a codebook of variable length codes, partitioning the codebook based on leading zeros (0) or ones (1), removing a common prefix, from each codeword to obtain a set of shortened codewords, determining a set of bit-patterns from the shortened codewords, partitioning the shortened codewords based on the set of bit-patterns to obtain sub-sets of the shortened codewords, removing a common prefix from each shortened codeword in the sub-sets of shortened codewords to obtain residual codewords, and forming a codebook based on the residual codewords.Type: GrantFiled: February 9, 2005Date of Patent: December 12, 2006Assignee: Intel CorporationInventor: Hari Thirumoorthy
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Publication number: 20060176195Abstract: An apparatus and method of decoding variable length codes is provided. According to some embodiments, a method includes receiving a bitstream of a codebook of variable length codes, partitioning the codebook based on leading zeros (0) or ones (1), removing a common prefix, from each codeword to obtain a set of shortened codewords, determining a set of bit-patterns from the shortened codewords, partitioning the shortened codewords based on the set of bit-patterns to obtain sub-sets of the shortened codewords, removing a common prefix from each shortened codeword in the sub-sets of shortened codewords to obtain residual codewords, and forming a codebook based on the residual codewords.Type: ApplicationFiled: February 9, 2005Publication date: August 10, 2006Inventor: Hari Thirumoorthy
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Publication number: 20050053020Abstract: A method, apparatus, and system for scaling a value of an amplitude to a binary value and a method, apparatus and system for reducing an undesirable portion of a signal.Type: ApplicationFiled: August 20, 2003Publication date: March 10, 2005Inventor: Hari Thirumoorthy
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Patent number: 6418172Abstract: A Nearest Neighbors Look-Ahead Maximum Likelihood Estimation Sequence (LA-MLSE) algorithm for decoding data in a digital communications system forms the following three vectors to decode data: (1) a vector of the encoder input bit signals A=A{k, k+1, k+2}, (2) a vector of the noise-free encoder channel output signals Y=Y{A(k), A(k+1), A(k+2)}; and (3) a vector of the received signals R=R(A(k), A(k+1), A(k+2)). If the distance between the received signal R and at least one of the channel output vectors which are of the form Y{1, A(k+1), A(k+2)} is shorter than the distance between the received signal R and the Nearest Neighbor of the signal Y{1, A(k+1), A(k+2)}, then A(k) is decoded as 1.Type: GrantFiled: April 21, 1999Date of Patent: July 9, 2002Assignee: National Semiconductor CorporationInventors: Sreen A. Raghavan, Hari Thirumoorthy