Patents by Inventor Amitava Das
Amitava Das 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: 20130130306Abstract: A colorimetric chemosensor molecule having a aza-macrocycle Zn (II)-complex (L.Zn) (Scheme 1, Formula 1A) which can recognize selectively and efficiently ATP (Adenosine triphosphate), a biologically significant triphosphate in aqueous medium at pH 7.4 is described. Since ATP is the source of energy in living organisms, L.Zn (Scheme 1, Formula 1A) can also be used as a staining agent in the living cells through binding to ATP, generated in situ during the metabolic process.Type: ApplicationFiled: March 21, 2011Publication date: May 23, 2013Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCHInventors: Prasenjit Mahato, Amrita Ghosh, Sanjiv Kumar Mishra, Anupama Shrivastava, Sandhya Mishra, Amitava Das
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Patent number: 8238651Abstract: To reduce the amount of storage space and computing power required to render image data, particularly building image data, primary and secondary colors may be extracted from the image data. The image data may be re-rendered using only the primary and secondary colors. The re-rendered image may be evaluated for patterns, the patterns thresholded to bi-level data and a Discrete Fourier Transform (DFT), or equivalent, may be performed on the bi-level data. Low order coefficients may be discarded depending on level accuracy desired. DFT coefficients and color data for the primary and secondary colors may then be used to construct an abstraction of the original image data, using data that is, in some cases, three or four orders of magnitude smaller than the original image data.Type: GrantFiled: June 20, 2008Date of Patent: August 7, 2012Assignee: Microsoft CorporationInventors: Neeharika Adabala, Aniruddha Loya, Amitava Das, Pragyana K. Mishra
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Patent number: 8185391Abstract: A speaker recognition system generates a codebook store with codebooks representing voice samples of speaker, referred to as trainers. The speaker recognition system may use multiple classifiers and generate a codebook store for each classifier. Each classifier uses a different set of features of a voice sample as its features. A classifier inputs a voice sample of an person and tries to authenticate or identify the person. A classifier generates a sequence of feature vectors for the input voice sample and then a code vector for that sequence. The classifier uses its codebook store to recognize the person. The speaker recognition system then combines the scores of the classifiers to generate an overall score. If the score satisfies a recognition criterion, then the speaker recognition system indicates that the voice sample is from that speaker.Type: GrantFiled: September 27, 2011Date of Patent: May 22, 2012Assignee: Microsoft CorporationInventor: Amitava Das
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Publication number: 20120016673Abstract: A speaker recognition system generates a codebook store with codebooks representing voice samples of speaker, referred to as trainers. The speaker recognition system may use multiple classifiers and generate a codebook store for each classifier. Each classifier uses a different set of features of a voice sample as its features. A classifier inputs a voice sample of an person and tries to authenticate or identify the person. A classifier generates a sequence of feature vectors for the input voice sample and then a code vector for that sequence. The classifier uses its codebook store to recognize the person. The speaker recognition system then combines the scores of the classifiers to generate an overall score. If the score satisfies a recognition criterion, then the speaker recognition system indicates that the voice sample is from that speaker.Type: ApplicationFiled: September 27, 2011Publication date: January 19, 2012Applicant: Microsoft CorporationInventor: Amitava Das
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Patent number: 8050919Abstract: A speaker recognition system generates a codebook store with codebooks representing voice samples of speaker, referred to as trainers. The speaker recognition system may use multiple classifiers and generate a codebook store for each classifier. Each classifier uses a different set of features of a voice sample as its features. A classifier inputs a voice sample of an person and tries to authenticate or identify the person. A classifier generates a sequence of feature vectors for the input voice sample and then a code vector for that sequence. The classifier uses its codebook store to recognize the person. The speaker recognition system then combines the scores of the classifiers to generate an overall score. If the score satisfies a recognition criterion, then the speaker recognition system indicates that the voice sample is from that speaker.Type: GrantFiled: June 29, 2007Date of Patent: November 1, 2011Assignee: Microsoft CorporationInventor: Amitava Das
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Patent number: 8024479Abstract: A method for distributing information in a network environment is provided that includes receiving a communication flow and executing a routing decision for the communication flow that directs the communication flow to a selected one of a plurality of servers. The routing decision is based on a selected one or more user-specified parameters and on one or more data segments that reflect feedback associated with one or more of the servers. The feedback indicates one or more conditions associated with one or more of the servers.Type: GrantFiled: April 16, 2007Date of Patent: September 20, 2011Assignee: Cisco Technology, Inc.Inventors: Amitava Das, Viren K. Malaviya
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Patent number: 8014510Abstract: A signaling network node is configured for identifying a received signaling message as belonging to one of a plurality of prescribed originating node groups, based on prescribed message class selection criteria. Each originating node group has at least one originating node and is assigned at least one congestion threshold relative to a message rate (e.g., messages per unit time or number of bytes per unit time). The signaling network node determines the message rate for each corresponding originating node group; if the message rate for an originating node group exceeds the corresponding at least one congestion threshold, the signaling network node outputs a congestion signaling message to the originating node having sent the signaling message, for reduction of the corresponding message rate.Type: GrantFiled: November 29, 2005Date of Patent: September 6, 2011Assignee: Cisco Technology, Inc.Inventors: Frank G. Bordonaro, Amitava Das, Paul A. Schmidt, Glenn D. Watson
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Patent number: 7991199Abstract: An identification system uses mappings of known objects to codebooks representing those objects to identify an object represented by multiple input representations or to verify that an input representation corresponds to an input known object. To identify the object, the identification system generates an input feature vector for each input representation. The identification system then accumulates for each known object the distances between the codebook of that object and each of the input feature vectors. The distance between a codebook and a feature vector may be the minimum of the distances between the code vectors of the codebook and the feature vector. The identification system then selects the object with the smallest accumulated distance as being the object represented by the multiple input representations.Type: GrantFiled: June 29, 2007Date of Patent: August 2, 2011Assignee: Microsoft CorporationInventor: Amitava Das
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Patent number: 7940656Abstract: A method for authenticating an element in a network environment is provided that includes receiving a request for one or more triplets. One or more of the triplets may be associated with an authentication communications protocol that may be executed in order to facilitate a communication session. The method further includes returning one or more of the triplets in response to the request and initiating the communication session in response to the triplets after proper authentication of an entity associated with the request.Type: GrantFiled: December 3, 2007Date of Patent: May 10, 2011Assignee: Cisco Technology, Inc.Inventors: Amitava Das, Michael A. Wright, Joseph A. Salowey, William C. Gossman
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Patent number: 7716723Abstract: A system for user authentication includes a gateway operable to receive a user authentication request in an Internet Protocol format from a server. The gateway communicates the user authentication request in a Signaling System 7 protocol to a user registry. The gateway is also operable to receive a user authentication response in the Signaling System 7 protocol from the user registry. The gateway communicates the user authentication response in the Internet Protocol format to the server.Type: GrantFiled: October 7, 2002Date of Patent: May 11, 2010Assignee: Cisco Technology, Inc.Inventors: Wayne N. Taylor, Joseph A. Salowey, Michael A. Wright, Amitava Das, William C. Gossman, Gopal K. Dommety
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Publication number: 20090304297Abstract: To reduce the amount of storage space and computing power required to render image data, particularly building image data, primary and secondary colors may be extracted from the image data. The image data may be re-rendered using only the primary and secondary colors. The re-rendered image may be evaluated for patterns, the patterns thresholded to bi-level data and a Discrete Fourier Transform (DFT), or equivalent, may be performed on the bi-level data. Low order coefficients may be discarded depending on level accuracy desired. DFT coefficients and color data for the primary and secondary colors may then be used to construct an abstraction of the original image data, using data that is, in some cases, three or four orders of magnitude smaller than the original image data.Type: ApplicationFiled: June 20, 2008Publication date: December 10, 2009Applicant: MICROSOFT CORPORATIONInventors: Neeharika Adabala, Aniruddha Loya, Amitava Das, Pragyana K. Mishra
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Patent number: 7508260Abstract: An amplifier is disclosed that contains a transistor (BJT), a switch (MOSFET), and a transformer. The collector of the BJT is connected to an end of the transformer while the base of the BJT is connected to a point between the ends of the transformer through the MOSFET. When the amplifier is in an active mode in which the amplifier has gain, signals supplied to the amplifier are provided to the transformer through the BJT. When the amplifier is in a bypass mode in which the amplifier does not have gain, signals supplied to the amplifier are provided to the transformer through the MOSFET and the BJT is turned off. The amplifier is designed such that the amplifier characteristics are optimized and then the MOSFET is connected to the transformer such that the input impedance of the amplifier is independent of the mode.Type: GrantFiled: November 16, 2007Date of Patent: March 24, 2009Assignee: Freescale Semiconductor, Inc.Inventor: Amitava Das
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Publication number: 20090006093Abstract: A speaker recognition system generates a codebook store with codebooks representing voice samples of speaker, referred to as trainers. The speaker recognition system may use multiple classifiers and generate a codebook store for each classifier. Each classifier uses a different set of features of a voice sample as its features. A classifier inputs a voice sample of an person and tries to authenticate or identify the person. A classifier generates a sequence of feature vectors for the input voice sample and then a code vector for that sequence. The classifier uses its codebook store to recognize the person. The speaker recognition system then combines the scores of the classifiers to generate an overall score. If the score satisfies a recognition criterion, then the speaker recognition system indicates that the voice sample is from that speaker.Type: ApplicationFiled: June 29, 2007Publication date: January 1, 2009Applicant: Microsoft CorporationInventor: Amitava Das
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Publication number: 20090003660Abstract: An identification system uses mappings of known objects to codebooks representing those objects to identify an object represented by multiple input representations or to verify that an input representation corresponds to an input known object. To identify the object, the identification system generates an input feature vector for each input representation. The identification system then accumulates for each known object the distances between the codebook of that object and each of the input feature vectors. The distance between a codebook and a feature vector may be the minimum of the distances between the code vectors of the codebook and the feature vector. The identification system then selects the object with the smallest accumulated distance as being the object represented by the multiple input representations.Type: ApplicationFiled: June 29, 2007Publication date: January 1, 2009Applicant: Microsoft CorporationInventor: Amitava Das
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Publication number: 20080081592Abstract: A method for authenticating an element in a network environment is provided that includes receiving a request for one or more triplets. One or more of the triplets may be associated with an authentication communications protocol that may be executed in order to facilitate a communication session. The method further includes returning one or more of the triplets in response to the request and initiating the communication session in response to the triplets after proper authentication of an entity associated with the request.Type: ApplicationFiled: December 3, 2007Publication date: April 3, 2008Applicant: Cisco Technology, Inc.Inventors: Amitava Das, Michael Wright, Joseph Salowey, William Gossman
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Publication number: 20080081590Abstract: An amplifier is disclosed that contains a transistor (BJT), a switch (MOSFET), and a transformer. The collector of the BJT is connected to an end of the transformer while the base of the BJT is connected to a point between the ends of the transformer through the MOSFET. When the amplifier is in an active mode in which the amplifier has gain, signals supplied to the amplifier are provided to the transformer through the BJT. When the amplifier is in a bypass mode in which the amplifier does not have gain, signals supplied to the amplifier are provided to the transformer through the MOSFET and the BJT is turned off. The amplifier is designed such that the amplifier characteristics are optimized and then the MOSFET is connected to the transformer such that the input impedance of the amplifier is independent of the mode.Type: ApplicationFiled: November 16, 2007Publication date: April 3, 2008Inventor: Amitava Das
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Patent number: 7310307Abstract: A method for authenticating an element in a network environment is provided that includes receiving a request for one or more triplets. One or more of the triplets may be associated with an authentication communications protocol that may be executed in order to facilitate a communication session. The method further includes returning one or more of the triplets in response to the request and initiating the communication session in response to the triplets after proper authentication of an entity associated with the request.Type: GrantFiled: December 17, 2002Date of Patent: December 18, 2007Assignee: Cisco Technology, Inc.Inventors: Amitava Das, Michael A. Wright, Joseph A. Salowey, William C. Gossman
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Publication number: 20070186280Abstract: A method for distributing information in a network environment is provided that includes receiving a communication flow and executing a routing decision for the communication flow that directs the communication flow to a selected one of a plurality of servers. The routing decision is based on a selected one or more user-specified parameters and on one or more data segments that reflect feedback associated with one or more of the servers. The feedback indicates one or more conditions associated with one or more of the servers.Type: ApplicationFiled: April 16, 2007Publication date: August 9, 2007Applicant: CISCO TECHNOLOGY, INC.Inventors: Amitava Das, Viren Malaviya
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Patent number: 7222195Abstract: A method for distributing information in a network environment is provided that includes receiving a communication flow and executing a routing decision for the communication flow that directs the communication flow to a selected one of a plurality of servers. The routing decision is based on a selected one or more user-specified parameters and on one or more data segments that reflect feedback associated with one or more of the servers. The feedback indicates one or more conditions associated with one or more of the servers.Type: GrantFiled: April 22, 2003Date of Patent: May 22, 2007Assignee: Cisco Technology, Inc.Inventors: Amitava Das, Viren K. Malaviya
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Publication number: 20070063767Abstract: An amplifier is disclosed that contains a transistor (BJT), a switch (MOSFET), and a transformer. The collector of the BJT is connected to an end of the transformer while the base of the BJT is connected to a point between the ends of the transformer through the MOSFET. When the amplifier is in an active mode in which the amplifier has gain, signals supplied to the amplifier are provided to the transformer through the BJT. When the amplifier is in a bypass mode in which the amplifier does not have gain, signals supplied to the amplifier are provided to the transformer through the MOSFET and the BJT is turned off. The amplifier is designed such that the amplifier characteristics are optimized and then the MOSFET is connected to the transformer such that the input impedance of the amplifier is independent of the mode.Type: ApplicationFiled: August 24, 2005Publication date: March 22, 2007Inventor: Amitava Das