Patents by Inventor Chao-Long Tsai
Chao-Long Tsai 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: 7673198Abstract: A testing system includes an integrated circuit having an analog design under test and a processor; an digital-to-analog converter (DAC), coupled to the analog design under test and the processor, for converting a digital testing sequence output of the processor into an analog testing sequence fed into the analog design under test; a analog-to-digital converter (ADC), coupled to the analog design under test and the processor, for converting an analog testing response of the analog design under test into a digital testing response fed into the processor; and an external tester, coupled to the processor of the integrated circuit, for sequentially outputting a program sequence to the processor; wherein the processor executes the program sequence without un-predictable conditional jump to get a testing result of the testing system and then outputs the testing result to the external tester.Type: GrantFiled: November 23, 2005Date of Patent: March 2, 2010Assignee: MediaTek Inc.Inventors: Li-Chun Tu, Chun-Yu Lin, Chao-Long Tsai, Chun-Chieh Shih
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Patent number: 7433282Abstract: A recording method and drive for optical storage media. The method inserts or replaces a special pattern in a recording EFM signal before the recording process is interrupted. Therefore, the special pattern is recorded either before or on the interrupted position. The starting position of the succeeding recording process is located by searching for the special pattern.Type: GrantFiled: April 9, 2004Date of Patent: October 7, 2008Assignee: MediaTek Inc.Inventors: Jyh-Shin Pan, Chao-Long Tsai, Hong-Ching Chen
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Patent number: 7388818Abstract: A link writing method for a recordable or rewritable compact disk includes recording a writing interruption address and enabling a succeeding writing process after the writing interruption. Enabling a succeeding writing process includes searching the linking area and enabling a start writing signal and activating a laser power. The method can link a succeeding writing area with a previously written interrupted area with sufficient accuracy to allow the data frame to be successfully processed by error correction within the host drive. The linking area may be positioned by counting the values of the interrupted block, the interrupted data frame, and the interrupted bit count or by detecting a blank area. Other techniques for positioning the linking area include detecting an unwritten area having a length greater than a maximum or writing a characteristic pattern after an interruption.Type: GrantFiled: May 4, 2007Date of Patent: June 17, 2008Assignee: Media Tek Inc.Inventors: Jyh-Shin Pan, Chao-Long Tsai
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Patent number: 7355939Abstract: A system and method of switching the control modes of spindle motor are described. The switch system comprises a first control module, a second control module and a switch controller. The first control module electrically coupled to the spindle motor and the OPU controls the spindle motor to be operated in a present mode. The second control module is electrically coupled to the spindle motor to control the spindle motor to be operated in the transition mode between the present mode and the target mode. The switch controller electrically coupled to the first control module, the second control module and the spindle motor receives a present feedback signal associated with the rotation of spindle motor to generate a first switch signal. Furthermore, the switch controller receives a target indicative signal associated with the information on the optical storage medium to generate a second switch signal.Type: GrantFiled: August 11, 2006Date of Patent: April 8, 2008Assignee: MEDIATEK Inc.Inventors: Chang-long Wu, Chao-long Tsai
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Patent number: 7333409Abstract: A link writing method for a recordable or rewritable compact disk includes recording a writing interruption address and enabling a succeeding writing process after the writing interruption. Enabling a succeeding writing process includes searching the linking area and enabling a start writing signal and activating a laser power. The method can link a succeeding writing area with a previously written interrupted area with sufficient accuracy to allow the data frame to be successfully processed by error correction within the host drive. The linking area may be positioned by counting the values of the interrupted block, the interrupted data frame, and the interrupted bit count or by detecting a blank area. Other techniques for positioning the linking area include detecting an unwritten area having a length greater than a maximum or writing a characteristic pattern after an interruption.Type: GrantFiled: August 29, 2005Date of Patent: February 19, 2008Assignee: Media Tek Inc.Inventors: Jyh-Shin Pan, Chao-Long Tsai
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Publication number: 20070206472Abstract: A link writing method for a recordable or rewritable compact disk includes recording a writing interruption address and enabling a succeeding writing process after the writing interruption. Enabling a succeeding writing process includes searching the linking area and enabling a start writing signal and activating a laser power. The method can link a succeeding writing area with a previously written interrupted area with sufficient accuracy to allow the data frame to be successfully processed by error correction within the host drive. The linking area may be positioned by counting the values of the interrupted block, the interrupted data frame, and the interrupted bit count or by detecting a blank area. Other techniques for positioning the linking area include detecting an unwritten area having a length greater than a maximum or writing a characteristic pattern after an interruption.Type: ApplicationFiled: May 4, 2007Publication date: September 6, 2007Applicant: MEDIATEK, INC.Inventors: Jyh-Shin Pan, Chao-Long Tsai
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Patent number: 7242650Abstract: The invention advantageously provides an apparatus and method for recovering clock signals extracted from prerecorded wobbled grooves formed in an optical storage medium such as a compact disk (CD), mini disk (MD) or digital video disk (DVD). A preferred embodiment of the method according to the invention primarily comprises the steps of extracting a series of wobble signals from the prerecorded information, demodulating the wobble signals for generating a series of demodulated clock signals, detecting a period for the clock signals, dividing each of the clock signals for acquiring a series of synchronization frames, generating compensating phases, and respectively adjusting the synchronization frames with the compensating phases for generating a series of phase compensated frames.Type: GrantFiled: January 23, 2003Date of Patent: July 10, 2007Assignee: Mediatek IncorporationInventors: Chao-Long Tsai, Jin-Bin Yang
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Patent number: 7133348Abstract: The invention provides a phase lock loop (PLL) in a controller of an optical disk system and methods therefor. According to a preferred embodiment of the invention, the PLL comprises a write phase detector, a read phase detector, and a common read/write module shared by the write and read phase detectors. Further according to the invention, the common read/write module comprises a read/write mode selector coupled to the write and read phase detectors, a charge pump coupled to the mode selector, a loop filter coupled to the charge pump, and a voltage control oscillator (VCO) coupled to the loop filter.Type: GrantFiled: August 1, 2002Date of Patent: November 7, 2006Assignee: Mediatek Inc.Inventors: Tse-hsiang Hsu, Chih-cheng Chen, Chao Long Tsai
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Patent number: 7023780Abstract: A link writing method for a recordable or rewritable compact disk includes recording a writing interruption address and enabling a succeeding writing process after the writing interruption. Enabling a succeeding writing process includes searching the linking area and enabling a start writing signal and activating a laser power. The method can link a succeeding writing area with a previously written interrupted area with sufficient accuracy to allow the data frame to be successfully processed by error correction within the host drive. The linking area may be positioned by counting the values of the interrupted block, the interrupted data frame, and the interrupted bit count or by detecting a blank area. Other techniques for positioning the linking area include detecting an unwritten area having a length greater than a maximum or writing a characteristic pattern after an interruption.Type: GrantFiled: March 8, 2001Date of Patent: April 4, 2006Assignee: MediaTek, Inc.Inventors: Jyh-Shin Pan, Chao-Long Tsai
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Patent number: 6980500Abstract: An ATIP (absolute time in pre-groove) bit data generator free from an uneven duty cycle. The ATIP bit data generator includes an analog processor, a high-frequency clock generator, a first decoder, a sync pattern detector, and a second decoder. The analog processor receives a signal generated from an optical pickup, and further processes the signal to generate an ATIP FM signal. The high-frequency clock generator provides a high-frequency clock using the ATIP FM signal as a reference signal. The first decoder receives the ATIP FM signal and the high-frequency clock and generates bi-phase data. The sync pattern detector receives the bi-phase data and the high-frequency clock, and generates a sync indication signal. The second decoder counts the pulse number of the high-frequency clock for each counting cycle, and the counting cycle includes a plurality of half periods of the ATIP FM signal.Type: GrantFiled: November 25, 2002Date of Patent: December 27, 2005Assignee: Media Tek Inc.Inventors: Ping-Hsing Lu, Yao-Jen Liang, Chao-Long Tsai
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Publication number: 20050281160Abstract: A link writing method for a recordable or rewritable compact disk includes recording a writing interruption address and enabling a succeeding writing process after the writing interruption. Enabling a succeeding writing process includes searching the linking area and enabling a start writing signal and activating a laser power. The method can link a succeeding writing area with a previously written interrupted area with sufficient accuracy to allow the data frame to be successfully processed by error correction within the host drive. The linking area may be positioned by counting the values of the interrupted block, the interrupted data frame, and the interrupted bit count or by detecting a blank area. Other techniques for positioning the linking area include detecting an unwritten area having a length greater than a maximum or writing a characteristic pattern after an interruption.Type: ApplicationFiled: August 29, 2005Publication date: December 22, 2005Inventors: Jyh-Shin Pan, Chao-Long Tsai
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Publication number: 20050207297Abstract: A device and method for calibrating linear velocity and track pitch for an optical disc is disclosed. The device comprises a frequency divider, a synchronous bit-clock generator, a counter and a linear velocity and track pitch calculator. The frequency divider receives a motor frequency generator (FG) pulse and generates a motor rotation period signal (FG/X). The synchronous bit-clock generator generates a high frequency bit-clock according to a reproduced signal read from disc. The bit counter counts the pulse of the bit-clock for each period of the motor rotation period signal to generate the data amount M. The linear velocity and track pitch calculator calculates the linear velocity by a linear velocity function with the information of the data amount M and the motor rotation period. Then, the linear velocity and track pitch calculator calculates the track pitch by a pitch function with the information of the data amount, radius and linear velocity at different tracks.Type: ApplicationFiled: May 5, 2005Publication date: September 22, 2005Applicant: MEDIATEK INC.Inventors: Chao-Long Tsai, Chi-Kwong Ho, Jin-Chuan Hsu
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Patent number: 6928038Abstract: A circuit in an optical read/write device for protecting synchronizing patterns is proposed. The protection circuit utilizes a clock with constant frequency as a reference clock. The circuit for protecting synchronizing patterns of this present invention includes a SYNC detector, a frame period counter, a valid-frame-period judgment unit, a frame period memory, a window generator, a real SYNC judgment unit, a SYNC lock judgment unit, and a SYNC signal generator. The circuit counts the pulse number of a reference clock with constant frequency for each frame to get a constant frame period. Then, the circuit can correctly interpolate the lost frame SYNC signal immediately by counting the reference clock, when the disk is defected.Type: GrantFiled: May 7, 2002Date of Patent: August 9, 2005Assignee: Media Tek Inc.Inventors: Chao-Long Tsai, Andrew Chang, Szu-Shan Lo
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Patent number: 6914862Abstract: A device and method for calibrating linear velocity and track pitch for an optical disc is disclosed. The device comprises a frequency divider, a synchronous bit-clock generator, a counter and a linear velocity and track pitch calculator. The frequency divider receives a motor frequency generator (FG) pulse and generates a motor rotation period signal (FG/X). The synchronous bit-clock generator generates a high frequency bit-clock according to a reproduced signal read from disc. The bit counter counts the pulse of the bit-clock for each period of the motor rotation period signal to generate the data amount M. The linear velocity and track pitch calculator calculates the linear velocity by a linear velocity function with the information of the data amount M and the motor rotation period. Then, the linear velocity and track pitch calculator calculates the track pitch by a pitch function with the information of the data amount, radius and linear velocity at different tracks.Type: GrantFiled: February 14, 2002Date of Patent: July 5, 2005Assignee: Mediatek Inc.Inventors: Chao-Long Tsai, Chi-Kwong Ho, Jin-Chuan Hsu
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Publication number: 20050058046Abstract: A recording method and drive for optical storage media. The method inserts or replaces a special pattern in a recording EFM signal before the recording process is interrupted. Therefore, the special pattern is recorded either before or on the interrupted position. The starting position of the succeeding recording process is located by searching for the special pattern.Type: ApplicationFiled: April 9, 2004Publication date: March 17, 2005Inventors: Jyh-Shin Pan, Chao-Long Tsai, Hong-Ching Chen
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Publication number: 20040145982Abstract: The invention advantageously provides an apparatus and method for recovering clock signals extracted from prerecorded wobbled grooves formed in an optical storage medium such as a compact disk (CD), mini disk (MD) or digital video disk (DVD). A preferred embodiment of the method according to the invention primarily comprises the steps of extracting a series of wobble signals from the prerecorded information, demodulating the wobble signals for generating a series of demodulated clock signals, detecting a period for the clock signals, dividing each of the clock signals for acquiring a series of synchronization frames, generating compensating phases, and respectively adjusting the synchronization frames with the compensating phases for generating a series of phase compensated frames.Type: ApplicationFiled: January 23, 2003Publication date: July 29, 2004Applicant: Media Tek IncorporationInventors: Chao-Long Tsai, Jin-Bin Yang
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Publication number: 20040022157Abstract: The invention provides a phase lock loop (PLL) in a controller of an optical disk system and methods therefor. According to a preferred embodiment of the invention, the PLL comprises a write phase detector, a read phase detector, and a common read/write module shared by the write and read phase detectors. Further according to the invention, the common read/write module comprises a read/write mode selector coupled to the write and read phase detectors, a charge pump coupled to the mode selector, a loop filter coupled to the charge pump, and a voltage control oscillator (VCO) coupled to the loop filter.Type: ApplicationFiled: August 1, 2002Publication date: February 5, 2004Applicant: Media Tek Inc.Inventors: Tse-Hsiang Hsu, Chih-Cheng Chen, Chao Long Tsai
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Publication number: 20030103428Abstract: An ATIP (absolute time in pre-groove) bit data generator free from an uneven duty cycle. The ATIP bit data generator includes an analog processor, a high-frequency clock generator, a first decoder, a sync pattern detector, and a second decoder. The analog processor receives a signal generated from an optical pickup, and further processes the signal to generate an ATIP FM signal. The high-frequency clock generator provides a high-frequency clock using the ATIP FM signal as a reference signal. The first decoder receives the ATIP FM signal and the high-frequency clock and generates bi-phase data. The sync pattern detector receives the bi-phase data and the high-frequency clock, and generates a sync indication signal. The second decoder counts the pulse number of the high-frequency clock for each counting cycle, and the counting cycle includes a plurality of half periods of the ATIP FM signal.Type: ApplicationFiled: November 25, 2002Publication date: June 5, 2003Inventors: Ping-Hsing Lu, Yao-Jen Liang, Chao-Long Tsai
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Publication number: 20020172111Abstract: A circuit in an optical read/write device for protecting synchronizing patterns is proposed. The protection circuit utilizes a clock with constant frequency as a reference clock. The circuit for protecting synchronizing patterns of this present invention includes a SYNC detector, a frame period counter, a valid-frame-period judgment unit, a frame period memory, a window generator, a real SYNC judgment unit, a SYNC lock judgment unit, and a SYNC signal generator. The circuit counts the pulse number of a reference clock with constant frequency for each frame to get a constant frame period. Then, the circuit can correctly interpolate the lost frame SYNC signal immediately by counting the reference clock, when the disk is defected.Type: ApplicationFiled: May 7, 2002Publication date: November 21, 2002Inventors: Chao-Long Tsai, Andrew Chang, Szu-Shan Lo
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Publication number: 20020145961Abstract: A device and method for calibrating linear velocity and track pitch for an optical disc is disclosed. The device comprises a frequency divider, a synchronous bit-clock generator, a counter and a linear velocity and track pitch calculator. The frequency divider receives a motor frequency generator (FG) pulse and generates a motor rotation period signal (FG/X). The synchronous bit-clock generator generates a high frequency bit-clock according to a reproduced signal read from disc. The bit counter counts the pulse of the bit-clock for each period of the motor rotation period signal to generate the data amount M. The linear velocity and track pitch calculator calculates the linear velocity by a linear velocity function with the information of the data amount M and the motor rotation period. Then, the linear velocity and track pitch calculator calculates the track pitch by a pitch function with the information of the data amount, radius and linear velocity at different tracks.Type: ApplicationFiled: February 14, 2002Publication date: October 10, 2002Inventors: Chao-Long Tsai, Chi-Kwong Ho, Jin-Chuan Hsu