Patents by Inventor Krishnamurthy Viswanathan
Krishnamurthy Viswanathan 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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Publication number: 20120089357Abstract: A method and apparatus are disclosed for identifying anomalies of a signal, by analyzing a signal using a frequency-based technique, analyzing results of the frequency-based analysis using a statistical analysis technique, determining one or more limits based on the statistical analysis, and comparing a frequency domain representation of the signal to the limits to identify anomalies of the signal.Type: ApplicationFiled: October 7, 2010Publication date: April 12, 2012Inventors: CHOUDUR LAKSHMINARAYAN, KRISHNAMURTHY VISWANATHAN
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Publication number: 20110119284Abstract: Provided are, among other things, systems, methods and techniques for generating a representative data string. In one representative implementation: (a) starting data positions are identified within input strings of data values; (b) a subsequence of output data values is determined based on the data values at data positions determined with reference to the starting data positions within the input strings; (c) an identification is made as to which of the input strings have segments that match the subsequence of output data values, based on a matching criterion; (d) steps (a)-(c) are repeated for a number of iterations; and (e) the subsequences of output data values are combined across the iterations to provide an output data string, with the determination in step (b) for a current iteration being based on the identification in step (c) for a previous iteration.Type: ApplicationFiled: January 18, 2008Publication date: May 19, 2011Inventors: Krishnamurthy Viswanathan, Ram Swaminathan
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Patent number: 7881245Abstract: To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.Type: GrantFiled: July 20, 2009Date of Patent: February 1, 2011Assignee: QUALCOMM IncorporatedInventors: Rajiv Vijayan, Fuyun Ling, Gordon Kent Walker, Ramaaswamy Murali, Ashok Mantravadi, Anand Subramaniam, Krishnamurthy Viswanathan, legal representative
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Patent number: 7836700Abstract: An exhaust flow system for use with a turbofan jet engine that provides separate fan flow and core flow streams that are not mixed. The system includes a fan nozzle and a primary flow nozzle. The primary flow nozzle includes a downstream edge portion that is either beveled with one or more beveled surfaces, or that contains a curving edge surface or a combination of a beveled edge and a curved edge to help direct noise generated by the jet engine upwardly away from a ground surface during take-off and landing procedures. The primary exhaust nozzle can also be orientated with an elongated lip portion thereof formed by the beveled edge surface such that the lip portion is orientated between a top dead center and a bottom dead center position, to thus help direct noise away from a cabin area of a fuselage of a mobile platform during cruise conditions.Type: GrantFiled: January 11, 2008Date of Patent: November 23, 2010Inventor: Krishnamurthy Viswanathan
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Patent number: 7787517Abstract: Accordingly, a method and apparatus are provided to convert received content into a first stream and a second stream, to transmit said first stream using a first tone and to transmit said second stream using an orthogonal scheme. A layering scheme is used to transmit the base stream covering a smaller area and an enhanced stream is used to cover a large utilizing orthogonal scheme.Type: GrantFiled: January 28, 2005Date of Patent: August 31, 2010Assignee: QUALCOMM IncorporatedInventors: Ashok Mantravadi, Anand D. Subramaniam, Krishnamurthy Viswanathan, legal representative, Dhananjay Ashok Gore
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Patent number: 7784285Abstract: An exhaust flow nozzle for use with a jet engine. The exhaust flow nozzle includes a beveled downstream edge portion that helps to direct noise generated by the jet engine upwardly away from a ground surface during takeoff and landing operations. One specific embodiment makes use of a linearly moveable flow altering component that is positioned outside the final flow nozzle. When the flow altering component is in its retracted position it has no effect on the exhaust flow leaving the flow nozzle. Alternative embodiments involve the use of varying edge shapes for the final flow nozzle.Type: GrantFiled: January 11, 2008Date of Patent: August 31, 2010Assignee: The Boeing CompanyInventor: Krishnamurthy Viswanathan
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Publication number: 20100098032Abstract: To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.Type: ApplicationFiled: December 23, 2009Publication date: April 22, 2010Applicant: QUALCOMM IncorporatedInventors: Rajiv Vijayan, Fuyun Ling, Gordon Kent Walker, Ramaswamy Murali, Ashok Mantravadi, Anand Subramaniam, Krishnamurthy Viswanathan
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Patent number: 7660275Abstract: To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.Type: GrantFiled: October 18, 2004Date of Patent: February 9, 2010Assignee: QUALCOMM IncorporatedInventors: Rajiv Vijayan, Fuyun Ling, Gordon Kent Walker, Ramaswamy Murali, Ashok Mantravadi, Anand Subramaniam, Krishnamurthy Viswanathan, legal representative
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Publication number: 20090279471Abstract: To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.Type: ApplicationFiled: July 20, 2009Publication date: November 12, 2009Applicant: QUALCOMM INCORPORATEDInventors: Rajiv Vijayan, Fuyun Ling, Gordon Kent Walker, Ramaaswamy Murali, Ashok Mantravadi, Anand Subramaniam, Krishnamurthy Viswanathan
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Publication number: 20090121046Abstract: An exhaust flow system for use with a turbofan jet engine that provides separate fan flow and core flow streams that are not mixed. The system includes a fan nozzle and a primary flow nozzle. The primary flow nozzle includes a downstream edge portion that is either beveled with one or more beveled surfaces, or that contains a curving edge surface or a combination of a beveled edge and a curved edge to help direct noise generated by the jet engine upwardly away from a ground surface during take-off and landing procedures. The primary exhaust nozzle can also be orientated with an elongated lip portion thereof formed by the beveled edge surface such that the lip portion is orientated between a top dead center and a bottom dead center position, to thus help direct noise away from a cabin area of a fuselage of a mobile platform during cruise conditions.Type: ApplicationFiled: January 11, 2008Publication date: May 14, 2009Applicant: The Boeing CompanyInventor: Krishnamurthy Viswanathan
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Publication number: 20090112900Abstract: Provided are, among other things, systems, methods and techniques for collaborative compression, in which is obtained a collection of files, with individual ones of the files including a set of ordered data elements (e.g., bit positions), and with individual ones of the data elements having different values in different ones of the files, but with the set of ordered data elements being common across the files. The data elements are partitioned into an identified set of bins based on statistics for the values of the data elements across the collection of files, and a received file is compressed based on the bins of data elements.Type: ApplicationFiled: October 31, 2007Publication date: April 30, 2009Inventors: Krishnamurthy Viswanathan, Ram Swaminathan, Mustafa Uysal
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Publication number: 20090044541Abstract: An exhaust flow nozzle for use with a jet engine. The exhaust flow nozzle includes a beveled downstream edge portion that helps to direct noise generated by the jet engine upwardly away from a ground surface during takeoff and landing operations. One specific embodiment makes use of a linearly moveable flow altering component that is positioned outside the final flow nozzle. When the flow altering component is in its retracted position it has no effect on the exhaust flow leaving the flow nozzle. Alternative embodiments involve the use of varying edge shapes for the final flow nozzle.Type: ApplicationFiled: January 11, 2008Publication date: February 19, 2009Applicant: The Boeing CompanyInventor: Krishnamurthy Viswanathan
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Patent number: 7377109Abstract: An exhaust flow system for use with a turbofan jet engine that provides separate fan flow and core flow streams that are not mixed. The system includes a fan nozzle and a primary flow nozzle. The primary flow nozzle includes a downstream edge portion that is either beveled with one or more beveled surfaces, or that contains a curving edge surface or a combination of a beveled edge and a curved edge to help direct noise generated by the jet engine upwardly away from a ground surface during take-off and landing procedures. The primary exhaust nozzle can also be orientated with an elongated lip portion thereof formed by the beveled edge surface such that the lip potion is orientated between a top dead center and a bottom dead center position, to thus help direct noise away from a cabin area of a fuselage of a mobile platform during cruise conditions.Type: GrantFiled: April 9, 2004Date of Patent: May 27, 2008Assignee: The Boeing CompanyInventor: Krishnamurthy Viswanathan
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Patent number: 7377108Abstract: An exhaust flow nozzle for use with a jet engine. The exhaust flow nozzle includes a beveled downstream edge portion that helps to direct noise generated by the jet engine upwardly away from a ground surface during takeoff and landing operations. One preferred embodiment makes use of a linearly moveable flow altering component that is positioned outside the final flow nozzle. When the flow altering component is in its retracted position it has no effect on the exhaust flow leaving the flow nozzle. Alternative embodiments involve the use of varying edge shapes for the final flow nozzle.Type: GrantFiled: April 9, 2004Date of Patent: May 27, 2008Assignee: The Boeing CompanyInventor: Krishnamurthy Viswanathan
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Patent number: 7269781Abstract: A method of and system for generating reliability information for a noisy signal received through a noise-introducing channel. In one embodiment, symbol-transition probabilities are determined for the noise-introducing channel. Occurrences of metasymbols in the noisy signal are counted, each metasymbol providing a context for a symbol of the metasymbol. For each metasymbol occurring in the noisy signal, reliability information for each possible value of the symbol of the metasymbol is determined, the reliability information representing a probability that the value in the original signal corresponding to the symbol of the metasymbol assumed each of the possible values. In another embodiment, error correction coding may be performed by adding redundant data to an original signal prior to transmission by the noise-introducing channel and performing error correction decoding after transmission.Type: GrantFiled: June 25, 2004Date of Patent: September 11, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: Itschak Weissman, Erik Ordentlich, Gadiel Seroussi, Sergio Verdu, Marcelo Weinberger, Krishnamurthy Viswanathan
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Publication number: 20050289406Abstract: A method of and system for generating reliability information for a noisy signal received through a noise-introducing channel. In one embodiment, symbol-transition probabilities are determined for the noise-introducing channel. Occurrences of metasymbols in the noisy signal are counted, each metasymbol providing a context for a symbol of the metasymbol. For each metasymbol occurring in the noisy signal, reliability information for each possible value of the symbol of the metasymbol is determined, the reliability information representing a probability that the value in the original signal corresponding to the symbol of the metasymbol assumed each of the possible values. In another embodiment, error correction coding may be performed by adding redundant data to an original signal prior to transmission by the noise-introducing channel and performing error correction decoding after transmission.Type: ApplicationFiled: June 25, 2004Publication date: December 29, 2005Inventors: Itschak Weissman, Erik Ordentlich, Gadiel Seroussi, Sergio Verdu, Marcelo Weinberger, Krishnamurthy Viswanathan
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Publication number: 20050223692Abstract: An exhaust flow system for use with a turbofan jet engine that provides separate fan flow and core flow streams that are not mixed. The system includes a fan nozzle and a primary flow nozzle. The primary flow nozzle includes a downstream edge portion that is either beveled with one or more beveled surfaces, or that contains a curving edge surface or a combination of a beveled edge and a curved edge to help direct noise generated by the jet engine upwardly away from a ground surface during take-off and landing procedures. The primary exhaust nozzle can also be orientated with an elongated lip portion thereof formed by the beveled edge surface such that the lip potion is orientated between a top dead center and a bottom dead center position, to thus help direct noise away from a cabin area of a fuselage of a mobile platform during cruise conditions.Type: ApplicationFiled: April 9, 2004Publication date: October 13, 2005Inventor: Krishnamurthy Viswanathan
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Publication number: 20050223691Abstract: An exhaust flow nozzle for use with a jet engine. The exhaust flow nozzle includes a beveled downstream edge portion that helps to direct noise generated by the jet engine upwardly away from a ground surface during takeoff and landing operations. One preferred embodiment makes use of a linearly moveable flow altering component that is positioned outside the final flow nozzle. When the flow altering component is in its retracted position it has no effect on the exhaust flow leaving the flow nozzle. Alternative embodiments involve the use of varying edge shapes for the final flow nozzle.Type: ApplicationFiled: April 9, 2004Publication date: October 13, 2005Inventor: Krishnamurthy Viswanathan
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Publication number: 20050122928Abstract: To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.Type: ApplicationFiled: October 18, 2004Publication date: June 9, 2005Inventors: Rajiv Vijayan, Fuyun Ling, Gordon Walker, Ramaswamy Murali, Ashok Mantravadi, Anand Subramaniam, Krishnamurthy Viswanathan