Patents by Inventor Yunhong Li
Yunhong Li 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: 20170361360Abstract: Disclosed examples include ultrasonic lens cleaning systems and driver circuits to clean a lens using four or more transducer segments mechanically coupled to the lens, in which the driver circuit provides phase shifted oscillating signals to the transducer segments to generate a mechanical traveling wave rotating around the center axis of the lens to vibrate the lens for improved ultrasonic cleaning.Type: ApplicationFiled: June 20, 2016Publication date: December 21, 2017Applicant: Texas Instruments IncorporatedInventors: Yunhong Li, David P. Magee, Stephen John Fedigan
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Patent number: 9667191Abstract: A frequency selectable driver circuit (driver circuit) includes a current drive transistor between a first and second node for driving a frequency selectable oscillator (FSO) coupled therebetween that includes a first LC network including an inductor L2 and a capacitor C2 in series and a second LC network in series with the first LC network. The second LC network includes a capacitor bank including capacitors in parallel including switches for switching (selectable capacitors) and an inductor L3 in parallel to the capacitor bank. Values of L2 and C2 provide a low frequency point fL which the LC network is overall capacitive, and in a frequency range between fa and fb above fL with only a portion of selectable capacitors selected a capacitance of the capacitor bank and value of L3 results in an overall impedance for the second LC network that is capacitive between fa and fb and inductive elsewhere.Type: GrantFiled: July 14, 2015Date of Patent: May 30, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Yunhong Li, Wei Ma
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Publication number: 20170019065Abstract: A frequency selectable driver circuit (driver circuit) includes a current drive transistor between a first and second node for driving a frequency selectable oscillator (FSO) coupled therebetween that includes a first LC network including an inductor L2 and a capacitor C2 in series and a second LC network in series with the first LC network. The second LC network includes a capacitor bank including capacitors in parallel including switches for switching (selectable capacitors) and an inductor L3 in parallel to the capacitor bank. Values of L2 and C2 provide a low frequency point fL which the LC network is overall capacitive, and in a frequency range between fa and fb above fL with only a portion of selectable capacitors selected a capacitance of the capacitor bank and value of L3 results in an overall impedance for the second LC network that is capacitive between fa and fb and inductive elsewhere.Type: ApplicationFiled: July 14, 2015Publication date: January 19, 2017Inventors: YUNHONG LI, WEI MA
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Patent number: 9479867Abstract: A device is configured for identifying a direction of a sound. The device includes a controller comprising circuitry. The circuitry is configured to receive a first output from a first input device and a second output from a second input device. The circuitry is also configured to add a delay to the second output. The circuitry is also configured to compare the first output to the delayed second output in a plurality of directions to form a comparison. The circuitry is also configured to identify a number of null directions of the plurality of directions where a set of nulls exists based on the comparison.Type: GrantFiled: July 3, 2014Date of Patent: October 25, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Yunhong Li
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Publication number: 20160294576Abstract: A communication device includes a communication port including network interface circuitry; and a processor, and a non-transitory storage medium configured to store program instructions which, when executed by the processor cause the communication device to perform a network operation comprising: entering into a listening phase; and searching for and attempting to acquire a network.Type: ApplicationFiled: November 20, 2014Publication date: October 6, 2016Inventors: Branislav Petrovic, Yoav Hebron, Sagar Jogadhenu, Michail Tsatsanis, Mark O'Leary, Yunhong Li, Inderjit Singh, Ronald B. Lee
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Publication number: 20160282922Abstract: A communication device includes a communication port including network interface circuitry; and a power control module configured to awaken the communication device from a sleep mode, determine whether a network is present at the communication port, and to return the communication device to the sleep mode if it is determined that a network is not present at the communication port.Type: ApplicationFiled: November 20, 2014Publication date: September 29, 2016Applicant: Entropic Communications, LLCInventors: Branislav Petrovic, Michail Tsatsanis, Mark O'Leary, Yunhong Li
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Patent number: 9454003Abstract: A lens assembly includes a first lens and a transducer attached to the first lens. A method of cleaning a lens includes vibrating the lens with a transducer attached to the lens. A method of making a lens assembly includes mounting a first lens above a second lens and attaching a transducer to the first lens.Type: GrantFiled: September 30, 2015Date of Patent: September 27, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Yunhong Li
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Publication number: 20160266379Abstract: Disclosed examples include ultrasonic cleaning systems, driver integrated circuits and methods for cleaning a lens, in which an oscillating drive signal is provided to an ultrasonic transducer and the driver controls the frequency of the drive signal according to a current sense signal representing a drive current flowing in the transducer. The driver sweeps the drive signal frequency and compares the sensed current values with predetermined profiles corresponding to a clean lens and a lens with one or more known contaminants, and generates the drive signal at one or more frequencies corresponding to peaks or valleys of the sensed current values or predetermined frequencies to promote cleaning of the lens.Type: ApplicationFiled: March 3, 2016Publication date: September 15, 2016Applicant: Texas Instruments IncorporatedInventors: Yunhong Li, Nabeel Fuad Khan
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Patent number: 9305540Abstract: A system and method for processing close talking differential microphone array (CTDMA) signals in which incoming microphone signals are transformed from time domain signals to frequency domain signals having separable magnitude and phase information. Processing of the frequency domain signals is performed using the magnitude information, following which phase information is reintroduced using phase information of one of the original frequency domain signals. As a result, high pass filtering effects of conventional differential signal processing of CTDMA signals are substantially avoided.Type: GrantFiled: January 4, 2013Date of Patent: April 5, 2016Assignee: NATIONAL SEMICONDUCTOR CORPORATIONInventors: Yunhong Li, Lin Sun, Wei Ma
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Patent number: 9257113Abstract: From at least a first microphone, first microphone signals are received that represent first sound waves. From at least a second microphone, second microphone signals are received that represent second sound waves. In response to the first microphone signals, first noise in the first sound waves is estimated, and first cancellation signals are output for causing a speaker array to generate first additional sound waves via at least a first acoustic beam for cancelling at least some of the first noise. In response to the second microphone signals, second noise in the second sound waves is estimated, and second cancellation signals are output for causing the speaker array to generate second additional sound waves via at least a second acoustic beam for cancelling at least some of the second noise.Type: GrantFiled: August 27, 2013Date of Patent: February 9, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Chuan Ni, Yunhong Li, Long Yin Chen
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Publication number: 20150063583Abstract: From at least a first microphone, first microphone signals are received that represent first sound waves. From at least a second microphone, second microphone signals are received that represent second sound waves. In response to the first microphone signals, first noise in the first sound waves is estimated, and first cancellation signals are output for causing a speaker array to generate first additional sound waves via at least a first acoustic beam for cancelling at least some of the first noise. In response to the second microphone signals, second noise in the second sound waves is estimated, and second cancellation signals are output for causing the speaker array to generate second additional sound waves via at least a second acoustic beam for cancelling at least some of the second noise.Type: ApplicationFiled: August 27, 2013Publication date: March 5, 2015Applicant: Texas Instruments IncorporatedInventors: Chuan Ni, Yunhong Li, Long Yin Chen
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Publication number: 20150016628Abstract: A device is configured for identifying a direction of a sound. The device includes a controller comprising circuitry. The circuitry is configured to receive a first output from a first input device and a second output from a second input device. The circuitry is also configured to add a delay to the second output. The circuitry is also configured to compare the first output to the delayed second output in a plurality of directions to form a comparison. The circuitry is also configured to identify a number of null directions of the plurality of directions where a set of nulls exists based on the comparison.Type: ApplicationFiled: July 3, 2014Publication date: January 15, 2015Inventor: Yunhong Li
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Patent number: 8824709Abstract: A system for generating 3D sound with adjustable source positioning includes a first stage and a second stage, which is coupled to the first stage and to a speaker array that includes a plurality of speakers. The first stage is configured to position a plurality of virtual sound sources through a positioner output. The second stage is configured to generate a 3D signal for the speaker array based on the positioner output. The speaker array is configured to generate a 3D sound stage including the virtual sound sources based on the 3D signal. The first stage may be further configured to reposition the virtual sound sources.Type: GrantFiled: October 14, 2010Date of Patent: September 2, 2014Assignee: National Semiconductor CorporationInventor: Yunhong Li
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Patent number: 8396233Abstract: A system includes multiple speakers arranged in a speaker array configuration. The system also includes one or more filters configured to filter audio signals and generate filtered audio signals. The one or more filters are configured to operate using filter coefficients associated with a desired beam pattern to be produced by the multiple speakers. The system further includes at least one amplifier configured to amplify the filtered audio signals and provide the amplified filtered audio signals to the speakers. The one or more filters reside within or are coupled to the at least one amplifier. The system may further include a controller configured to modify at least one of the filter coefficients based on a change in the speaker configuration. The filters may operate independently of a centralized processor, and a centralized processor may not even be required to provide electronic beam forming.Type: GrantFiled: September 2, 2010Date of Patent: March 12, 2013Assignee: Texas Instruments IncorporatedInventors: Wei Ma, Yunhong Li, Ahmad Bahai
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Patent number: 8363846Abstract: A system and method for processing close talking differential microphone array (CTDMA) signals in which incoming microphone signals are transformed from time domain signals to frequency domain signals having separable magnitude and phase information. Processing of the frequency domain signals is performed using the magnitude information, following which phase information is reintroduced using phase information of one of the original frequency domain signals. As a result, high pass filtering effects of conventional differential signal processing of CTDMA signals are substantially avoided.Type: GrantFiled: March 9, 2007Date of Patent: January 29, 2013Assignee: National Semiconductor CorporationInventors: Yunhong Li, Lin Sun, Wei Ma
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Publication number: 20120121113Abstract: A system for directing sound in a vehicle includes a passenger selector, a controller, a pattern generator and a speaker array. The passenger selector is configured to generate a direction signal based on a selection of at least one passenger in the vehicle. The controller is configured to generate a pattern signal based on the direction signal. The pattern generator is configured to receive unpatterned audio data and to generate patterned audio data based on the pattern signal. The speaker array is configured to receive the patterned audio data and to generate a directed sound field based on the patterned audio data such that the directed sound field is directed toward the at least one selected passenger.Type: ApplicationFiled: November 16, 2010Publication date: May 17, 2012Applicant: National Semiconductor CorporationInventor: Yunhong Li
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Publication number: 20120093348Abstract: A system for generating 3D sound with adjustable source positioning includes a first stage and a second stage, which is coupled to the first stage and to a speaker array that includes a plurality of speakers. The first stage is configured to position a plurality of virtual sound sources through a positioner output. The second stage is configured to generate a 3D signal for the speaker array based on the positioner output. The speaker array is configured to generate a 3D sound stage including the virtual sound sources based on the 3D signal. The first stage may be further configured to reposition the virtual sound sources.Type: ApplicationFiled: October 14, 2010Publication date: April 19, 2012Applicant: NATIONAL SEMICONDUCTOR CORPORATIONInventor: Yunhong Li
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Patent number: 7953233Abstract: A synchronous detection and calibration system is provided for expedient calibration of differential acoustic sensors in a manufacturing and testing environment. By processing a series of sequentially received tones, respective portions of a system using differential acoustic sensors are tuned for optimum individual operation, following which corresponding control data are generated and stored for use in selecting among predetermined calibration vectors which establish and maintain optimum system operation.Type: GrantFiled: March 20, 2007Date of Patent: May 31, 2011Assignee: National Semiconductor CorporationInventors: Peter Holloway, Yunhong Li, Wei Ma, Peter Kamp
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Publication number: 20110064254Abstract: A system includes a portable electronic device and a case configured to be placed in association with the portable electronic device. The case includes an interface configured to receive audio signals from the portable electronic device and a speaker array configured to generate audible sounds having one or more specified audio effects based on the audio signals. The case could also include an audio amplifier configured to amplify the audio signals and to provide the amplified audio signals to the speaker array. The audio amplifier could include a filter configured to filter the audio signals in order to produce the one or more specified audio effects. The case could further include a processor configured to (i) process the audio signals in order to produce the one or more specified audio effects and (ii) output the processed audio signals to the audio amplifier.Type: ApplicationFiled: September 10, 2010Publication date: March 17, 2011Applicant: NATIONAL SEMICONDUCTOR CORPORATIONInventors: Yunhong Li, Wei Ma, Guy K. Nicholson
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Publication number: 20110051937Abstract: A system includes multiple speakers arranged in a speaker array configuration. The system also includes one or more filters configured to filter audio signals and generate filtered audio signals. The one or more filters are configured to operate using filter coefficients associated with a desired beam pattern to be produced by the multiple speakers. The system further includes at least one amplifier configured to amplify the filtered audio signals and provide the amplified filtered audio signals to the speakers. The one or more filters reside within or are coupled to the at least one amplifier. The system may further include a controller configured to modify at least one of the filter coefficients based on a change in the speaker configuration. The filters may operate independently of a centralized processor, and a centralized processor may not even be required to provide electronic beam forming.Type: ApplicationFiled: September 2, 2010Publication date: March 3, 2011Applicant: NATIONAL SEMICONDUCTOR CORPORATIONInventors: Wei Ma, Yunhong Li, Ahmad Bahai