Patents by Inventor Gae-ok Cho
Gae-ok Cho 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: 7342854Abstract: An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after comparing the signals from light receiving elements, which correspond to the set group of the optical detection unit, with the reference signals set for the each group; an error correction unit for correcting and outputting errors if there are any errors after mutual comparison with signals of the groups output from the comparator; a phase-difference detection unit for outputting the signals for each group that correspond to a phase-difference after mutual comparison of the signals of the groups output from the error correction unit; a subtractor for mutually subtracting the signals for each group from the phase-difference detection unit and outputting the tracking error signals.Type: GrantFiled: July 20, 2006Date of Patent: March 11, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Dae-Hoon Kwon, Gae-ok Cho
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Patent number: 7289406Abstract: A writable area detection device for an optical recording/reproducing apparatus comprises a waveform rectification unit for comparing an RF signal read from a user data area of a recording medium with a reference signal, and outputting a rectified pulse signal; a pulse generation unit for generating a signal having a pulse width including a section in which a high frequency signal of the rectified pulse signal is regularly distributed; a latch unit for latching the signal generated in the pulse generation unit; and a detection unit for detecting the section in which the high frequency signal is regularly distributed by using an output signal of the latch unit and an output signal of the pulse generation unit.Type: GrantFiled: December 9, 2003Date of Patent: October 30, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Soo-jung Chang, Gae-ok Cho, Jung-eun Lee
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Publication number: 20070109925Abstract: An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after comparing the signals from light receiving elements, which correspond to the set group of the optical detection unit, with the reference signals set for the each group; an error correction unit for correcting and outputting errors if there are any errors after mutual comparison with signals of the groups output from the comparator; a phase-difference detection unit for outputting the signals for each group that correspond to a phase-difference after mutual comparison of the signals of the groups output from the error correction unit; a subtractor for mutually subtracting the signals for each group from the phase-difference detection unit and outputting the tracking error signals.Type: ApplicationFiled: December 29, 2006Publication date: May 17, 2007Inventors: Dae-Hoon Kwon, Gae-ok Cho
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Patent number: 7177245Abstract: An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after comparing the signals from light receiving elements, which correspond to the set group of the optical detection unit, with the reference signals set for the each group; an error correction unit for correcting and outputting errors if there are any errors after mutual comparison with signals of the groups output from the comparator; a phase-difference detection unit for outputting the signals for each group that correspond to a phase-difference after mutual comparison of the signals of the groups output from the error correction unit; a subtractor for mutually subtracting the signals for each group from the phase-difference detection unit and outputting the tracking error signals.Type: GrantFiled: May 5, 2003Date of Patent: February 13, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Dae-Hoon Kwon, Gae-ok Cho
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Publication number: 20060285451Abstract: An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after comparing the signals from light receiving elements, which correspond to the set group of the optical detection unit, with the reference signals set for the each group; an error correction unit for correcting and outputting errors if there are any errors after mutual comparison with signals of the groups output from the comparator; a phase-difference detection unit for outputting the signals for each group that correspond to a phase-difference after mutual comparison of the signals of the groups output from the error correction unit; a subtractor for mutually subtracting the signals for each group from the phase-difference detection unit and outputting the tracking error signals.Type: ApplicationFiled: July 20, 2006Publication date: December 21, 2006Inventors: Dae-Hoon Kwon, Gae-ok Cho
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Patent number: 6903671Abstract: Disclosed is a digital-to-analog (D/A) converter with low skew and glitches. The D/A converter has current cells each outputting a different current amount and current switches selectively enabling the current cells, and obtains an analog signal from voltages corresponding to output currents of the current cells by operating the current switches, characterized in that the current switches are each provided with MOS transistors each having an adjusted aspect ratio so as to have a constant capacitance load regardless of the output current amounts from the current cells. In such a D/A converter, parasitic capacitances of MOS transistors provided in the current switches are adjusted constant regardless of output current amounts, so that the D/A converter can operate at a high speed with low skew and glitch.Type: GrantFiled: January 23, 2004Date of Patent: June 7, 2005Assignee: Samsung Electronics Co., Ltd.Inventors: Dae-hoon Kwon, Gae-ok Cho, Jae-jun Moon
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Publication number: 20040150542Abstract: Disclosed is a digital-to-analog (D/A) converter with low skew and glitches. The D/A converter has current cells each outputting a different current amount and current switches selectively enabling the current cells, and obtains an analog signal from voltages corresponding to output currents of the current cells by operating the current switches, characterized in that the current switches are each provided with MOS transistors each having an adjusted aspect ratio so as to have a constant capacitance load regardless of the output current amounts from the current cells. In such a D/A converter, parasitic capacitances of MOS transistors provided in the current switches are adjusted constant regardless of output current amounts, so that the D/A converter can operate at a high speed with low skew and glitch.Type: ApplicationFiled: January 23, 2004Publication date: August 5, 2004Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Dae-hoon Kwon, Gae-ok Cho, Jae-jun Moon
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Publication number: 20040145990Abstract: A writable area detection device for an optical recording/reproducing apparatus comprises a waveform rectification unit for comparing an RF signal read from a user data area of a recording medium with a reference signal, and outputting a rectified pulse signal; a pulse generation unit for generating a signal having a pulse width including a section in which a high frequency signal of the rectified pulse signal is regularly distributed; a latch unit for latching the signal generated in the pulse generation unit; and a detection unit for detecting the section in which the high frequency signal is regularly distributed by using an output signal of the latch unit and an output signal of the pulse generation unit.Type: ApplicationFiled: December 9, 2003Publication date: July 29, 2004Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Soo-Jung Chang, Gae-Ok Cho, Jung-Eun Lee
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Publication number: 20040022142Abstract: An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after comparing the signals from light receiving elements, which correspond to the set group of the optical detection unit, with the reference signals set for the each group; an error correction unit for correcting and outputting errors if there are any errors after mutual comparison with signals of the groups output from the comparator; a phase-difference detection unit for outputting the signals for each group that correspond to a phase-difference after mutual comparison of the signals of the groups output from the error correction unit; a subtractor for mutually subtracting the signals for each group from the phase-difference detection unit and outputting the tracking error signals.Type: ApplicationFiled: May 5, 2003Publication date: February 5, 2004Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Dae-Hoon Kwon, Gae-ok Cho