Patents by Inventor Chandrakant Bhailalbhai Patel
Chandrakant Bhailalbhai Patel 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: 8265129Abstract: A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.38 MHz. The final IF signal is digitized for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The presence of the pilot carrier accompanying a selected VSB HDTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode.Type: GrantFiled: May 14, 1998Date of Patent: September 11, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Allen LeRoy Limberg
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Patent number: 6939826Abstract: Product package, comprising a data storage device, packaging material, and an authentication system. The authentication system comprises first and second coatings coated on the storage device and the packaging material. One of the coatings comprises chromogenic microcapsules capable of reacting to produce color. The other coating comprises color developer. The coatings can be bonded to each other or a composite coating can be a self-contained color former such as on the storage device. The invention further comprises methods of affirming authenticity of a data storage device. The method comprises applying to the storage device a color-reactable coating which can react with a color-producing second composition, packaging the storage device to provide a closed and sealed packaged, opening the package, and concurrent with or after opening the package, reacting the chemical compositions to produce the color as an indication of authenticity of the data storage device.Type: GrantFiled: June 25, 2002Date of Patent: September 6, 2005Assignee: Appleton Papers, Inc.Inventors: Jan Lyle Peebles, Chandrakant Bhailalbhai Patel
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Patent number: 6937292Abstract: Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same VBLI in each successive field facilitates the more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing basis. A television receiver for use with such composite GCR signals includes means for separating the chirp and PN sequence portions of the GCR signals from the remainder of the composite video signal, a ghost cancellation filter and an equalization filter connected in cascade to respond to the composite video signal and provided each with adjustable filtering weights, means responding to the separated chirp portions of the GCR signals to calculate a discrete Fourier transform (DFT) therefrom, means responding to that DFT to determine the adjustable filtering weights of the ghost cancellation filter, and means responding to the separated PN sequences to determine the adjustable filtering weights of the equalization filter.Type: GrantFiled: November 29, 1993Date of Patent: August 30, 2005Assignee: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Jian Yang
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Patent number: 6873371Abstract: Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same vertical-blanking-interval (VBI) scan line in each successive field facilitate more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing basis. A television receiver for use with such composite GCR signals includes circuitry for separating the chirp and PN sequence portions of the GCR signals from the remainder of the composite video signal, a ghost cancellation filter and an equalization filter connected in cascade to respond to the composite video signal and provided each with adjustable filtering weights, and a computer. Random-access memory addressed during writing snatches the vertical-blanking-interval scan lines selected to include GCR signals. Sets of four successive ones of the selected scan lines are then additively and subtractively combined to separate the chirp portions of the GCR signals from a remainder of the composite video signal.Type: GrantFiled: May 24, 2002Date of Patent: March 29, 2005Assignee: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Jian Yang
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Publication number: 20040213358Abstract: A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.38 MHz. The final IF signal is digitized for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The presence of the pilot carrier accompanying a selected VSB HDTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode.Type: ApplicationFiled: May 25, 2004Publication date: October 28, 2004Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Chandrakant Bhailalbhai Patel, Allen LeRoy Limberg
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Patent number: 6768517Abstract: DTV signals transmitted over the air with a symbol rate of around 10.76 million samples per second include echo-cancellation reference (ECR) signals each of which includes or essentially consists of a repetitive-PN1023 sequence with baud-rate symbols, which repetitive-PN1023 sequence incorporates a number of consecutive data-segment synchronization signals. Receivers for these DTV signals respond to these ECR signals to generate initial weighting coefficients for adaptive filters used for channel equalization and echo suppression. The initial weighting coefficients are calculated from a cepstrum extracted from the repetitive-PN1023 sequence ECR signal by DFT methods or with a PN1023 auto-correlation match filter.Type: GrantFiled: July 11, 2001Date of Patent: July 27, 2004Inventors: Allen Le Roy Limberg, James Douglas McDonald, Chandrakant Bhailalbhai Patel
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Publication number: 20030193618Abstract: A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.38 MHz. The final IF signal is digitized for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The presence of the pilot carrier accompanying a selected VSB HDTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode.Type: ApplicationFiled: August 25, 1998Publication date: October 16, 2003Inventors: CHANDRAKANT BHAILALBHAI PATEL, ALLEN LEROY LIMBERG
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Patent number: 6544926Abstract: Dual shell microcapsule aggregate particles and copy materials coated therewith, such aggregate particles having inner shells surrounding chromogenic nucleus material, and outer shells encompassing multiple such inner shells to form aggregate particles thereof. The inner shells are derived from polar pre-polymer compositions. The outer shells are derived from complex colloids such as gelatin and gelatin derivatives. The outer shell material causes agglomeration of the inner shells into aggregate particles, thus increasing the sizes of the particles without increasing the sizes of the respective inner-shell microcapsules which contain the chromogenic material.Type: GrantFiled: October 11, 2001Date of Patent: April 8, 2003Assignee: Appleton Papers Inc.Inventors: Jerome Robert Bodmer, Chandrakant Bhailalbhai Patel, Troy Ronald Seehafer, Todd Arlin Schwantes
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Patent number: 6496230Abstract: A plural-conversion digital television signal receiver that embodies the invention upconverts digital television signal from a selected television channel to a UHF initial I-F signal. After image-rejection filtering there is a single-step downconversion of the initial UHF first I-F signal to a low-band final I-F signal, the uppermost frequency of which is in the high-frequency band. The low-band final I-F signal is digitized and demodulated in the digital regime to generate a baseband signal.Type: GrantFiled: September 15, 1999Date of Patent: December 17, 2002Assignee: Samsung Electronics Co., Ltd.Inventors: Allen LeRoy Limberg, Chandrakant Bhailalbhai Patel
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Patent number: 6480239Abstract: Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same vertical-blanking-interval (VBI) scan line in each successive field facilitate more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing basis. A television receiver for use with such composite GCR signals includes circuitry for separating the chirp and PN sequence portions of the GCR signals from the remainder of the composite video signal, a ghost cancellation filter and an equalization filter connected in cascade to respond to the composite video signal and provided each with adjustable filtering weights, and a computer. Random-access memory addressed during writing snatches the vertical-blanking-interval scan lines selected to include GCR signals. Sets of four successive ones of the selected scan lines are then additively and subtractively combined to separate the chirp portions of the GCR signals from a remainder of the composite video signal.Type: GrantFiled: May 19, 2000Date of Patent: November 12, 2002Assignee: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Jian Yang
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Publication number: 20020135700Abstract: Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same vertical-blanking-interval (VBI) scan line in each successive field facilitate more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing basis. A television receiver for use with such composite GCR signals includes circuitry for separating the chirp and PN sequence portions of the GCR signals from the remainder of the composite video signal, a ghost cancellation filter and an equalization filter connected in cascade to respond to the composite video signal and provided each with adjustable filtering weights, and a computer. Random-access memory addressed during writing snatches the vertical-blanking-interval scan lines selected to include GCR signals. Sets of four successive ones of the selected scan lines are then additively and subtractively combined to separate the chirp portions of the GCR signals from a remainder of the composite video signal.Type: ApplicationFiled: May 24, 2002Publication date: September 26, 2002Applicant: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Jian Yang
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Publication number: 20020097341Abstract: Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same vertical-blanking-interval (VBI) scan line in each successive field facilitate more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing basis. A television receiver for use with such composite GCR signals includes circuitry for separating the chirp and PN sequence portions of the GCR signals from the remainder of the composite video signal, a ghost cancellation filter and an equalization filter connected in cascade to respond to the composite video signal and provided each with adjustable filtering weights, and a computer. Random-access memory addressed during writing snatches the vertical-blanking-interval scan lines selected to include GCR signals. Sets of four successive ones of the selected scan lines are then additively and subtractively combined to separate the chirp portions of the GCR signals from a remainder of the composite video signal.Type: ApplicationFiled: May 31, 2001Publication date: July 25, 2002Applicant: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Jian Yang
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Publication number: 20020051087Abstract: DTV signals transmitted over the air with a symbol rate of around 10.76 million samples per second include echo-cancellation reference (ECR) signals each of which includes or essentially consists of a repetitive-PN1023 sequence with baud-rate symbols, which repetitive-PN1023 sequence incorporates a number of consecutive data-segment synchronization signals. Receivers for these DTV signals respond to these ECR signals to generate initial weighting coefficients for adaptive filters used for channel equalization and echo suppression. The initial weighting coefficients are calculated from a cepstrum extracted from the repetitive-PN1023 sequence ECR signal by DFT methods or with a PN1023 auto-correlation match filter.Type: ApplicationFiled: July 11, 2001Publication date: May 2, 2002Inventors: Allen Le Roy Limberg, James Douglas McDonald, Chandrakant Bhailalbhai Patel
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Patent number: 6184938Abstract: Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same vertical-blanking-interval (VBI) scan line in each successive field facilitate more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing basis. A television receiver for use with such composite GCR signals includes circuitry for separating the chirp and PN sequence portions of the GCR signals from the remainder of the composite video signal, a ghost cancellation filter and an equalization filter connected in cascade to respond to the composite video signal and provided each with adjustable filtering weights, and a computer. Random-access memory addressed during writing snatches the vertical-blanking-interval scan lines selected to include GCR signals. Sets of four successive ones of the selected scan lines are then additively and subtractively combined to separate the chirp portions of the GCR signals from a remainder of the composite video signal.Type: GrantFiled: February 4, 1999Date of Patent: February 6, 2001Assignee: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Jian Yang
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Patent number: 6104442Abstract: A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.38 MHz. The final IF signal is digitized for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The presence of the pilot carrier accompanying a selected VSB HDTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode.Type: GrantFiled: June 28, 1994Date of Patent: August 15, 2000Assignee: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Allen LeRoy Limberg
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Patent number: 5805053Abstract: An electrical appliance in which a power line adapter unit is embodied by which information signals are conducted to and from a power line from and to the appliance along the same connection to the power line by which the appliance is powered.Type: GrantFiled: October 21, 1996Date of Patent: September 8, 1998Assignee: Elcom Technologies, Inc.Inventors: Chandrakant Bhailalbhai Patel, Jack Rudolph Harford, Glenn Seggern
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Patent number: 5777545Abstract: Remote control apparatus for a power line communications system in which control signals are transmitted, via the power line to, from the location of utilization equipment to a control unit located at a remote point and by which the utilization equipment is controlled.Type: GrantFiled: March 26, 1997Date of Patent: July 7, 1998Assignee: Elcom Technologies CorporationInventors: Chandrakant Bhailalbhai Patel, Joseph Robert Ader, Henry Charles Klein, John Artman
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Patent number: 5715012Abstract: A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.27 MHz. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner.Type: GrantFiled: March 13, 1996Date of Patent: February 3, 1998Assignee: Samsung Electronics Co., Ltd.Inventors: Chandrakant Bhailalbhai Patel, Allen LeRoy Limberg
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Patent number: 5712614Abstract: A power line communications system in which information signals are frequency multiplied in a transmitter unit, so that the critical information portions of the information signals are frequency shifted from a notch in the frequency response characteristic between an outlet in the power line communications system to which the transmitter unit is connected and an outlet in the power line communications system to which a receiver unit is connected, whereby the critical information portions of the information signals are not lost in the notch.Type: GrantFiled: May 9, 1995Date of Patent: January 27, 1998Assignee: Elcom Technologies CorporationInventors: Chandrakant Bhailalbhai Patel, Jack Rudy Harford, Stephen Pudles, Joseph Robert Ader
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Patent number: 5708701Abstract: A power line telephone communications system having an ON HOOK digital voiceband messaging feature by which selected information contained in an incoming call to a telephone is received prior tc the telephone being lifted off its hook. The incoming ring signals, ON HOOK digital voiceband messaging and information signals are conducted by a base unit to the power line for transmission to an extension unit to which a telephone is connected.Type: GrantFiled: July 17, 1995Date of Patent: January 13, 1998Assignee: Elcom Technologies CorporationInventors: Felix Houvig, Chandrakant Bhailalbhai Patel