Patents by Inventor Ka Lun Choi
Ka Lun Choi 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: 8929446Abstract: A combiner processing system and a method of operating the combiner processing system are disclosed. In one embodiment, the combiner processing system is utilized for a support layer processing in a bit-rate reduction system that separates video data into a main layer and a support layer with separated encodings for the two layers for bit-rate reduction and data transmission efficiency. Preferably, the combiner processing system for the support layer processing is capable of processing repeat patterns, small high frequency details, and textual information contained in one or more images. Furthermore, in one embodiment, the combiner processing system for the support layer processing provides a motion vector detection on a full image reconstruction, a non-linear quantization which retains both textual information and small high frequency details, utilization of full combination motion vectors, and a separate processing path for textual information with an internal bit-rate reduction unit.Type: GrantFiled: March 14, 2014Date of Patent: January 6, 2015Assignee: Faroudja Enterprises, Inc.Inventors: Yves Faroudja, Ka Lun Choi, Xu Dong
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Patent number: 8831354Abstract: One or more systems and methods for edge-adaptive and recursive non-linear filtering of ringing effect on image or video data are disclosed in accordance with various embodiments of the invention. In one embodiment of the invention, a method for edge-adaptive and recursive non-linear filtering of ringing effect first involves detecting all edges within a process area of an image, including a direction of an edge slope and a value of an edge signal level. Then, if the process area is determined to be a “non-busy” area based on a “busyness” measure relative to empirically-defined threshold values, then an edge influence function subsequently determines whether to apply a de-ringing filter to a current pixel within the process area or not. Preferably, the de-ringing filter is edge-adaptive, non-linear, and recursive. The de-ringing filter can adjust the current pixel multiple times based on filter angles, adjacent pixels, and pixel transition levels.Type: GrantFiled: January 8, 2014Date of Patent: September 9, 2014Assignee: Faroudja Enterprises, Inc.Inventors: Yves Faroudja, Ka Lun Choi, Xu Dong
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Patent number: 7038495Abstract: Provided is a circuit to convert input CMOS level signals having a predetermined duty cycle to CML level signals having a higher duty cycle. The circuit includes two differential transistor pairs connected together. The two differential pairs are constructed and arranged to use gates of the associated transistors as inputs to receive and combine a number of phase shifted CMOS input signals. The combined CMOS input signal are converted to CML level signals which are provided as circuit outputs.Type: GrantFiled: June 16, 2004Date of Patent: May 2, 2006Assignee: Broadcom CorporationInventor: Ka Lun Choi
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Patent number: 7034584Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: GrantFiled: March 10, 2005Date of Patent: April 25, 2006Assignee: Broadcom CorporationInventors: Ka Lun Choi, Derek Hing Sang Tam
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Patent number: 7005902Abstract: A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur.Type: GrantFiled: February 18, 2005Date of Patent: February 28, 2006Assignee: Broadcom CorporationInventor: Ka Lun Choi
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Publication number: 20050156639Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: ApplicationFiled: March 10, 2005Publication date: July 21, 2005Applicant: Broadcom CorporationInventors: Ka Lun Choi, Derek Tam
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Publication number: 20050146364Abstract: A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur.Type: ApplicationFiled: February 18, 2005Publication date: July 7, 2005Applicant: Broadcom CorporationInventor: Ka Lun Choi
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Patent number: 6882190Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: GrantFiled: February 2, 2004Date of Patent: April 19, 2005Assignee: Broadcom CorporationInventors: Ka Lun Choi, Derek Hing Sang Tam
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Patent number: 6873194Abstract: A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur.Type: GrantFiled: February 20, 2004Date of Patent: March 29, 2005Assignee: Broadcom CorporationInventor: Ka Lun Choi
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Patent number: 6864723Abstract: A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur.Type: GrantFiled: September 20, 2001Date of Patent: March 8, 2005Assignee: Broadcom CorporationInventor: Ka Lun Choi
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Publication number: 20040222822Abstract: Provided is a circuit to convert input CMOS level signals having a predetermined duty cycle to CML level signals having a higher duty cycle. The circuit includes two differential transistor pairs connected together. The two differential pairs are constructed and arranged to use gates of the associated transistors as inputs to receive and combine a number of phase shifted CMOS input signals. The combined CMOS input signal are converted to CML level signals which are provided as circuit outputs.Type: ApplicationFiled: June 16, 2004Publication date: November 11, 2004Applicant: Broadcom CorporationInventor: Ka Lun Choi
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Patent number: 6794907Abstract: Provided is a circuit to convert input CMOS level signals having a predetermined duty cycle to CML level signals having a higher duty cycle. The circuit includes two differential transistor pairs connected together. The two differential pairs are constructed and arranged to use gates of the associated transistors as inputs to receive and combine a number of phase shifted CMOS input signals. The combined CMOS input signal are converted to CML level signals which are provided as circuit outputs.Type: GrantFiled: September 17, 2001Date of Patent: September 21, 2004Assignee: Broadcom CorporationInventor: Ka Lun Choi
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Publication number: 20040160249Abstract: A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur.Type: ApplicationFiled: February 20, 2004Publication date: August 19, 2004Applicant: Broadcom CorporationInventor: Ka Lun Choi
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Publication number: 20040150437Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: ApplicationFiled: February 2, 2004Publication date: August 5, 2004Inventors: Ka Lun Choi, Derek Hing Sang Tam
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Patent number: 6707327Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: GrantFiled: December 2, 2002Date of Patent: March 16, 2004Assignee: Broadcom CorporationInventors: Ka Lun Choi, Derek Hing Sang Tam
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Patent number: 6642753Abstract: A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur.Type: GrantFiled: September 20, 2001Date of Patent: November 4, 2003Assignee: Broadcom CorporationInventor: Ka Lun Choi
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Publication number: 20030117187Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: ApplicationFiled: December 2, 2002Publication date: June 26, 2003Applicant: Broadcom CorporationInventors: Ka Lun Choi, Derek Hing Sang Tam
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Patent number: 6570417Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: GrantFiled: October 22, 2001Date of Patent: May 27, 2003Assignee: Broadcom CorporationInventors: Ka Lun Choi, Derek Hing Sang Tam
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Publication number: 20020057117Abstract: A frequency dividing circuit divides a master clock frequency by a non-integer factor to provide an output clock signal whose frequency is equal to the frequency of the master clock signal divided by that non-integer factor. In one embodiment, the circuit is operative to divide the master clock frequency by 2.5.Type: ApplicationFiled: October 22, 2001Publication date: May 16, 2002Inventors: Ka Lun Choi, Derek Hing Sang Tam
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Publication number: 20020036538Abstract: A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur.Type: ApplicationFiled: September 20, 2001Publication date: March 28, 2002Inventor: Ka Lun Choi