Patents by Inventor Chang-Hyeon Lee
Chang-Hyeon Lee 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: 20080180549Abstract: A multifunctional video apparatus and a method of providing a user interface (UI) thereof. The multifunctional video apparatus has diverse functions such as image capturing, image reproduction, image editing, image input/output from/to an external device, etc., and provides a UI capable of performing the above-described functions more conveniently.Type: ApplicationFiled: October 11, 2007Publication date: July 31, 2008Applicant: Samsung Electronics Co., Ltd.Inventors: Chang-hyeon LEE, Han-Kon Kim
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Patent number: 7259633Abstract: According to one exemplary embodiment, a frequency synthesizer module includes a loop filter, where the loop filter includes a capacitor having a first terminal and a second terminal. The frequency synthesizer module further includes a loop filter calibration module coupled to the capacitor in the loop filter. The loop filter calibration module causes an initial capacitance between the first terminal and the second terminal of the capacitor to increase to a target capacitance when the loop filter is in a calibration mode. The target capacitance can causes in increase in control of a bandwidth of the loop filter and a reduction in percent error of a unity gain bandwidth of the loop filter. The loop filter further includes a switched capacitor array configured to cause the initial capacitance to increase to the target capacitance in response to a digital feedback signal provided by the loop filter calibration module.Type: GrantFiled: May 24, 2005Date of Patent: August 21, 2007Assignee: Skyworks Solutions, Inc.Inventors: Chang-Hyeon Lee, Akbar Ali
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Publication number: 20060267697Abstract: According to one exemplary embodiment, a frequency synthesizer module includes a loop filter, where the loop filter includes a capacitor having a first terminal and a second terminal. The frequency synthesizer module further includes a loop filter calibration module coupled to the capacitor in the loop filter. The loop filter calibration module causes an initial capacitance between the first terminal and the second terminal of the capacitor to increase to a target capacitance when the loop filter is in a calibration mode. The target capacitance can causes in increase in control of a bandwidth of the loop filter and a reduction in percent error of a unity gain bandwidth of the loop filter. The loop filter further includes a switched capacitor array configured to cause the initial capacitance to increase to the target capacitance in response to a digital feedback signal provided by the loop filter calibration module.Type: ApplicationFiled: May 24, 2005Publication date: November 30, 2006Inventors: Chang-Hyeon Lee, Akbar Ali
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Publication number: 20060246862Abstract: A local oscillator circuit for generating a local frequency signal is provided. The local oscillator circuit may cooperate with a radio circuit for providing wireless reception or transmission. The radio circuit performs modulation or demodulation processes with reference to a defined carrier signal frequency. The local oscillator circuit has a voltage controlled oscillator that generates a VCO signal at frequency different than the carrier frequency. A frequency scaling circuit applies a scaling factor to the VCO signal, with the scaled signal generated at the frequency of the defined carrier frequency.Type: ApplicationFiled: April 27, 2005Publication date: November 2, 2006Inventors: Bipul Agarwal, John Vasa, David Yates, Chang-hyeon Lee, Aravind Loke
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Patent number: 7109805Abstract: A system for direct modulation is disclosed. Embodiments of the direct modulator for shift-keying modulation include impressing baseband data on a radio frequency (RF) signal at an oscillator by controlling a digital divider using a sigma-delta modulator.Type: GrantFiled: July 29, 2004Date of Patent: September 19, 2006Assignee: Skyworks Solutions, Inc.Inventors: Chang-Hyeon Lee, Hoon Lee, Akbar Ali
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Patent number: 7031088Abstract: An apparatus for detecting an abnormality of a recorded signal of a recorder/player includes a plurality of recording/reproducing heads for recording/reproducing a signal onto/from a medium, and a determining portion for determining an abnormality of the recorded signal based on the signal reproduced by the recording/reproducing heads. While one recording/reproducing head records the signal of image and/or sound on the medium, the other recording/reproducing head reproduces the signal recorded by the recording/reproducing head. The determining portion determines the abnormality of the recorded signal by determining whether or not the signal reproduced from the medium is in a normal data format, or by determining whether or not an envelope of reproduced signals is greater than a predetermined level. Accordingly, when abnormality of recorded signal occurs due to a presence of foreign substances on the heads or from other problem sources, a user is immediately notified of such an abnormality.Type: GrantFiled: April 2, 2004Date of Patent: April 18, 2006Assignee: Samsung Electronics Co., Ltd.Inventor: Chang-Hyeon Lee
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Publication number: 20060022758Abstract: A system for direct modulation is disclosed. Embodiments of the direct modulator for shift-keying modulation include impressing baseband data on a radio frequency (RF) signal at an oscillator by controlling a digital divider using a sigma-delta modulator.Type: ApplicationFiled: July 29, 2004Publication date: February 2, 2006Inventors: Chang-Hyeon Lee, Hoon Lee, Akbar Ali
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Patent number: 6968029Abstract: A synchronous prescaler is provided that has an input line for receiving an input signal, which is synchronized to a low order dual modulus prescaler. The dual modulus prescaler generally divides responsive to a mode command line, but may have a dead-zone period where it may fail to respond to a generated mode command. The dual modulus prescaler also has an output line that is synchronized to an extender section. The extender section is used to further divide the input signal, and is synchronized to an adjustable counter section. A sync controller circuit receives an output from the counter section, as well as a timing signal from the extender, and generates the mode signal on the mode command line. In this arrangement, the sync controller generates the mode signal at a time when the low order dual modulus is in a condition to change divide modes, thereby avoiding providing the signal during the dead-zone period.Type: GrantFiled: August 3, 2004Date of Patent: November 22, 2005Assignee: Skyworks Solutions, Inc.Inventors: Chang-Hyeon Lee, Akbar Ali
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Patent number: 6954090Abstract: A low power charge pump is provided that has complementary transistors capable of isolating switching noise from the input switching transistors. The charge pump uses charged currents that are matched in both magnitude and time to reduce switching noise in the output of the charge pump. The charge pump is also designed for use in a phase lock loop.Type: GrantFiled: June 23, 2003Date of Patent: October 11, 2005Assignee: Skyworks Solutions, Inc.Inventors: Chang-Hyeon Lee, Akbar Ali
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Publication number: 20040184179Abstract: An apparatus for detecting an abnormality of a recorded signal of a recorder/player includes a plurality of recording/reproducing heads for recording/reproducing a signal onto/from a medium, and a determining portion for determining an abnormality of the recorded signal based on the signal reproduced by the recording/reproducing heads. While one recording/reproducing head records the signal of image and/or sound on the medium, the other recording/reproducing head reproduces the signal recorded by the recording/reproducing head. The determining portion determines the abnormality of the recorded signal by determining whether or not the signal reproduced from the medium is in a normal data format, or by determining whether or not an envelope of reproduced signals is greater than a predetermined level. Accordingly, when abnormality of recorded signal occurs due to a presence of foreign substances on the heads or from other problem sources, a user is immediately notified of such an abnormality.Type: ApplicationFiled: April 2, 2004Publication date: September 23, 2004Inventor: Chang-Hyeon Lee
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Patent number: 6747828Abstract: An apparatus for detecting an abnormality of a recorded signal of a recorder/player includes a plurality of recording/reproducing heads for recording/reproducing a signal onto/from a medium, and a determining portion for determining an abnormality of the recorded signal based on the signal reproduced by the recording/reproducing heads. While one recording/reproducing head records the signal of image and/or sound on the medium, the other recording/reproducing head reproduces the signal recorded by the recording/reproducing head. The determining portion determines the abnormality of the recorded signal by determining whether or not the signal reproduced from the medium is in a normal data format, or by determining whether or not an envelope of reproduced signals is greater than a predetermined level. Accordingly, when abnormality of recorded signal occurs due to a presence of foreign substances on the heads or from other problem sources, a user is immediately notified of such an abnormality.Type: GrantFiled: February 22, 2001Date of Patent: June 8, 2004Assignee: Samsung Electronics Co., Ltd.Inventor: Chang-Hyeon Lee
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Publication number: 20030231037Abstract: A low power charge pump is provided that has complementary transistors capable of isolating switching noise from the input switching transistors. The charge pump uses charged currents that are matched in both magnitude and time to reduce switching noise in the output of the charge pump. The charge pump is also designed for use in a phase lock loop.Type: ApplicationFiled: June 23, 2003Publication date: December 18, 2003Inventors: Chang-Hyeon Lee, Akbar Ali
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Publication number: 20030231036Abstract: A low power voltage-to-current converter is provided for use in a phase lock loop circuit. The low power voltage-to-current converter includes an input stage, and output stage, and a non-differential output terminal. The input stage includes a pair of differential signal input terminals to receive a differential input signal pair, a first and second switching transistor pair coupled to the differential input signal pair, and a first and second complementary transistor pair coupled to the first and second switching transistor pair. The output stage is coupled to the first complementary transistor. The non-differential output terminal is coupled to the output stage, and is operable to transmit an output current signal, wherein the output current signal is a function of the differential input signals. The voltage-to-current converter is also designed for use in a phase lock loop.Type: ApplicationFiled: June 23, 2003Publication date: December 18, 2003Inventors: Chang-Hyeon Lee, Akbar Ali
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Patent number: 6611160Abstract: A low power charge pump is provided that has complementary transistors capable of isolating switching noise from the input switching transistors. The charge pump uses charged currents that are matched in both magnitude and time to reduce switching noise in the output of the charge pump. The charge pump is also designed for use in a phase lock loop.Type: GrantFiled: November 21, 2000Date of Patent: August 26, 2003Assignee: Skyworks Solutions, Inc.Inventors: Chang-Hyeon Lee, Akbar Ali
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Patent number: 6470134Abstract: A method and apparatus for dubbing a recording tape in a video recording and reproducing device. A source video recording and reproducing device reproduces data of a source recording tape in response to a dubbing demand from a user and confirms an error recording portion and a data unrecorded portion. The source video recording and reproducing device performs error correction with respect to the error recording portion and generates a non-recording control pulse with respect to the data unrecorded portion. The reproduced data and the non-recording control pulse is transmitted to a target video recording and reproducing device. The target video recording and reproducing device records, in a target recording tape, the reproduced data except data transmitted during an interval of the non-recording control pulse.Type: GrantFiled: December 22, 1998Date of Patent: October 22, 2002Assignee: Samsung Electronics Co., Ltd.Inventor: Chang-Hyeon Lee
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Publication number: 20020114094Abstract: An apparatus for detecting an abnormality of a recorded signal of a recorder/player includes a plurality of recording/reproducing heads for recording/reproducing a signal onto/from a medium, and a determining portion for determining an abnormality of the recorded signal based on the signal reproduced by the recording/reproducing heads. While one recording/reproducing head records the signal of image and/or sound on the medium, the other recording/reproducing head reproduces the signal recorded by the recording/reproducing head. The determining portion determines the abnormality of the recorded signal by determining whether or not the signal reproduced from the medium is in a normal data format, or by determining whether or not an envelope of reproduced signals is greater than a predetermined level. Accordingly, when abnormality of recorded signal occurs due to a presence of foreign substances on the heads or from other problem sources, a user is immediately notified of such an abnormality.Type: ApplicationFiled: February 22, 2001Publication date: August 22, 2002Inventor: Chang-Hyeon Lee
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Patent number: 6091442Abstract: An apparatus for improving the visibility of an image to be displayed is provided in an image signal processor such as a TV or VCR. The image visibility improvement apparatus compares levels of an input image signal with predetermined individual high-level or low-level reference values and outputs the compared result signals. The visibility improvement apparatus increases the level of the image signal if the level of the input image signal is higher than the high-level reference value and decreases the level of the image signal if the input signal is lower than the low-level reference value, according to the results of the comparison. The apparatus thereby further distinguishes the level of the signal of a brighter region from that of a darker region. Thus, the image displayed on a screen can be viewed more easily.Type: GrantFiled: February 13, 1997Date of Patent: July 18, 2000Assignee: Samsung Electronics Co., Ltd.Inventor: Chang-Hyeon Lee