Patents by Inventor Kevin T. Chang
Kevin T. Chang 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: 20140029747Abstract: A system is provided for use with secure content in a first format. The system includes a conditional access device, a transcoding device and a media processor. The conditional access device is operable to receive the secure content and can generate a second secure content based on the secure content. The conditional access device can further provide the second secure content to the transcoding device.Type: ApplicationFiled: July 25, 2012Publication date: January 30, 2014Applicant: GENERAL INSTRUMENT CORPORATIONInventors: John P. Kamieniecki, Tat Keung Chan, Kevin T. Chang, Alexander Medvinsky
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Patent number: 8375415Abstract: The present invention is an upstream power control system, within a cable modem which controls the power consumption of the cable modem. The power control system comprises a MAC chip which synchronizes upstream communication signals for transmission to a cable network and outputs an upstream control signal, an upstream amplifier which receives the synchronized upstream communication signals, and a complex programmable logic device (CPLD). The CPLD controls the upstream amplifier in response to the upstream control signal such that the upstream amplifier is powered on during transmission of the communication signals, and powered off when not transmitting, which results in the reduction of power consumed by the cable modem.Type: GrantFiled: March 19, 2001Date of Patent: February 12, 2013Assignee: General Instrument CorporationInventors: Matthew Waight, Yucheng Jin, Kevin T. Chang
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Publication number: 20120159146Abstract: A system is provided for use with secure content in a first format. The system includes a conditional access device, a transcoding device and a media processor. The conditional access device is arranged to receive the secure content and can generate second secure content based on the secure content. The conditional access device is can further provide the second secure content to the transcoding device. The transcoding device can transcode the second secure content into transcoded content of a second format, can secure the transcoded content as secure transcoded content and can provide the secure transcoded content to the media processor.Type: ApplicationFiled: December 20, 2010Publication date: June 21, 2012Applicant: GENERAL INSTRUMENT CORPORATIONInventors: John P. Kamieniecki, Kevin T. Chang
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Patent number: 7742777Abstract: A dynamic arrangement for reducing the presence of ingress noise in the upstream signal path of a two-way cable system utilizes a variable attenuation element and amplifier disposed along the upstream signal path. The amplifier includes a bypass switch so that the amplifier may be switched in to or out of the upstream path. A signal processor associated with the communications gateway functions to calculate the upstream loss present at the gateway and control the operation of the attenuation element, amplifier and bypass switch accordingly. Upstream attenuation is selected to be as large as possible, yet still allow in-building cable devices to communicate with their associated head end (HE) receiver equipment, after accounting for maximum transmit limitations.Type: GrantFiled: February 28, 2006Date of Patent: June 22, 2010Assignee: General Instrument CorporationInventors: Jay Strater, Dean Stoneback, Kevin T. Chang
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Patent number: 7680251Abstract: A method and apparatus for preventing false alarm activation is provided. According to one embodiment of the invention, a determination (410) is made as to whether an instruction from a controller is a commanded reset, and control of a Subscriber Line Interface Circuit is taken (416) from a voice processor circuit when the instruction is a commanded reset.Type: GrantFiled: September 13, 2005Date of Patent: March 16, 2010Assignee: Motorola, Inc.Inventors: Marlin F. McGregor, Kevin T. Chang, Ben M. Foose
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Patent number: 7610034Abstract: A double conversion tuner system is disclosed that avoids the problem of degraded performance as a result of radiated interferers. Several selection criteria are described for specifying the parameters of the tuner, including the nominal first or high intermediate frequency, a first local oscillator signal for each desired channel, a nominal second local oscillator signal, and a bandwidth of the first intermediate frequency.Type: GrantFiled: October 18, 2005Date of Patent: October 27, 2009Assignee: General Instrument CorporationInventor: Kevin T. Chang
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Patent number: 7039432Abstract: A dynamic arrangement for reducing the presence of ingress noise in the upstream signal path of a two-way cable system utilizes a variable attenuation element and amplifier disposed along the upstream signal path. The amplifier includes a bypass switch so that the amplifier may be switched in to or out of the upstream path. A signal processor associated with the communications gateway functions to calculate the upstream loss present at the gateway and control the operation of the attenuation element, amplifier and bypass switch accordingly. Upstream attenuation is selected to be as large as possible, yet still allow in-building cable devices to communicate with their associated head end (HE) receiver equipment, after accounting for maximum transmit limitations.Type: GrantFiled: December 4, 2002Date of Patent: May 2, 2006Assignee: General Instrument CorporationInventors: Jay Strater, Dean Stoneback, Kevin T. Chang
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Patent number: 6816512Abstract: An arrangement for controlling multiple telephone lines terminating in a single residence uses a multiplexer within a communications gateway and a plurality of demultiplexers, each demultiplexer coupled to a separate one of telephone lines. The communications gateway functions to convert all received analog telephony signals into a digital format and then multiplexes the digital signals onto a single telephone line connected to the residence. The various telephone lines in the residence are connected in series along the line, using a number of drop-off points. The demultiplexer on each telephone line is configured to recognize the time slots within the multiplexed signal destined for its associated telecommunications device. In a similar fashion, separate time slots are assigned for upstream transmission from each telecommunication device into the HFC network.Type: GrantFiled: December 29, 2000Date of Patent: November 9, 2004Assignee: General Instrument CorporationInventors: David B. Lazarus, Yucheng Jin, James D. Rosemary, Matthew G. Waight, Kevin T. Chang
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Publication number: 20030114112Abstract: A dynamic arrangement for reducing the presence of ingress noise in the upstream signal path of a two-way cable system utilizes a variable attenuation element and amplifier disposed along the upstream signal path. The amplifier includes a bypass switch so that the amplifier may be switched in to or out of the upstream path. A signal processor associated with the communications gateway functions to calculate the upstream loss present at the gateway and control the operation of the attenuation element, amplifier and bypass switch accordingly. Upstream attenuation is selected to be as large as possible, yet still allow in-building cable devices to communicate with their associated head end (HE) receiver equipment, after accounting for maximum transmit limitations.Type: ApplicationFiled: December 4, 2002Publication date: June 19, 2003Inventors: Jay Strater, Dean Stoneback, Kevin T. Chang
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Publication number: 20030033608Abstract: A cable system having a splitter for coupling a drop interface to a cable modem and pass-through to a home interface. The pass-through is provided with an RF module having separate forward and return paths to selectively provide unimpeded, partially impeded and fully impeded cable service in the forward and return paths. Amplifiers in the forward and return paths are controlled to avoid excessive insertion loss and to provide power equalization in the return path to limit ingress noise to the home.Type: ApplicationFiled: August 10, 2001Publication date: February 13, 2003Applicant: General Instrument CorporationInventors: Kevin T. Chang, Richard Moore, Jay Strater
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Patent number: 6477253Abstract: A method and device for scrambling video signals for broadcast in a proprietary television system includes modifying the vertical or horizontal synchronization pulses of the video signal to prevent unauthorized viewers from properly displaying the programming content. Preferably, the vertical sync pulses are removed from the signal prior to broadcast and replaced with horizontal sync pulses. A descrambler used with the receiving television uses the manner in which the false horizontal sync pulses were inserted into the video signal to recreate a sufficient approximation of the vertical sync pulses.Type: GrantFiled: January 13, 1999Date of Patent: November 5, 2002Assignee: General Instrument CorporationInventors: Timothy D. Rea, Alfred W. Stufflet, Kevin T. Chang
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Publication number: 20020133829Abstract: The present invention is an upstream power control system, within a cable modem which controls the power consumption of the cable modem. The power control system comprises a MAC chip which synchronizes upstream communication signals for transmission to a cable network and outputs an upstream control signal, an upstream amplifier which receives the synchronized upstream communication signals, and a complex programmable logic device (CPLD). The CPLD controls the upstream amplifier in response to the upstream control signal such that the upstream amplifier is powered on during transmission of the communication signals, and powered off when not transmitting, which results in the reduction of power consumed by the cable modem.Type: ApplicationFiled: March 19, 2001Publication date: September 19, 2002Inventors: Matthew Waight, Yucheng Jin, Kevin T. Chang
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Publication number: 20010033585Abstract: An arrangement for controlling multiple telephone lines terminating in a single residence uses a multiplexer within a communications gateway and a plurality of demultiplexers, each demultiplexer coupled to a separate one of telephone lines. The communications gateway functions to convert all received analog telephony signals into a digital format and then multiplexes the digital signals onto a single telephone line connected to the residence. The various telephone lines in the residence are connected in series along the line, using a number of drop-off points. The demultiplexer on each telephone line is configured to recognize the time slots within the multiplexed signal destined for its associated telecommunications device. In a similar fashion, separate time slots are assigned for upstream transmission from each telecommunication device into the HFC network.Type: ApplicationFiled: December 29, 2000Publication date: October 25, 2001Inventors: David B. Lazarus, Yucheng Jin, James D. Rosemary, Matthew G. Waight, Kevin T. Chang
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Patent number: 6260193Abstract: A system for synchronizing one or more decoders with a network sync signal at a headend of a television communication network. The system allows decoders to transmit upstream messages synchronously in time slots which are defined according to the network sync signal, thereby improving system throughput. Identifying data is provided in a blanking interval (VBI or HBI) of one or more television signals to designate a horizontal scan line of the respective television signal which follows a reference point in the network sync signal by a predetermined delay. At each decoder, the identifying data is recovered, and the onset of the designated scan line can be used to signal the start of a transmission for the decoder. Preferably, the identifying data is provided in each television signal so the user is not forced to tune to a particular television channel to transmit a message. Various channel access protocols may be used, such as a session oriented protocol, or a synchronized ALOHA protocol.Type: GrantFiled: February 9, 1998Date of Patent: July 10, 2001Assignee: General Instrument CorporationInventors: Kevin T. Chang, David E. Chodelka, Charles E. Schell, III, Sam Reichgott
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Patent number: 6072872Abstract: A signal such as an analog scrambled television signal in a cable television network has first scrambling mode data which is compatible with a first decoder population, but not a second decoder population. The scrambled television signal is processed to determine the scrambling mode without recovering the first scrambling mode data. Second scrambling mode data which is compatible with the second decoder population is then provided in the scrambled television signal, for example, in the vertical blanking interval or on an audio subcarrier. During processing to determine the scrambling mode, the television signal is delayed, e.g., by digitizing it and temporarily storing it in memory. The delay compensates for the time required to determine the scrambling mode. The television signal is recovered in the analog domain prior to inserting the second scrambling mode data.Type: GrantFiled: January 27, 1998Date of Patent: June 6, 2000Assignee: General Instrument CorporationInventors: Kevin T. Chang, Alfred W. Stufflet
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Patent number: D562813Type: GrantFiled: December 16, 2005Date of Patent: February 26, 2008Assignee: General Instrument CorporationInventors: William J. Storti, Kevin T. Chang, Barry P. Falvo, Paul Ocepek
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Patent number: D745480Type: GrantFiled: December 22, 2014Date of Patent: December 15, 2015Assignee: ARRIS Enterprises, Inc.Inventors: Carol Mathews, Yung-Chun Lun, Gary A. Dorfner, Chin-Tan Chang, Kevin T. Chang