Patents Assigned to Vimicro Corporation
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Patent number: 9954560Abstract: Techniques pertaining to an adaptive/configurable IF wireless receiver are disclosed. Such an adaptive/configurable IF wireless receiver can be used in a Bluetooth device.Type: GrantFiled: October 21, 2014Date of Patent: April 24, 2018Assignee: Wuxi Vimicro CorporationInventors: Bo Xia, Yue Wu, David Xiaodong Yang, Bin Xu, Li Kang
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Patent number: 9553979Abstract: Techniques for a personalized Bluetooth headset and a voice interaction control method thereof are described. According to one aspect of the present invention, the Bluetooth headset is caused to maintain a voice contact list. Each item in the voice contact list corresponds to a phone number associated with a set of audio data (e.g., a voice or a predefined audio). When a paired mobile device receives a call, the voice contact list is searched per the caller number. A corresponding audio is played back when an item is located in the voice contact list. As such a user of the Bluetooth headset knows who is calling and determines whether the call shall be answered or not.Type: GrantFiled: July 30, 2014Date of Patent: January 24, 2017Assignee: Wuxi Vimicro CorporationInventors: David Yang, Jian Chen, Feng Zhu, Yuhong Feng
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Patent number: 9497317Abstract: Techniques for a personalized Bluetooth headset and a voice interaction control method thereof are described. According to one aspect of the present invention, the Bluetooth headset is configured to create and maintain a voice-based table. Each item in the table includes a phone number paired with a set of audio data (e.g., a voice or a predefined audio), where the audio data is created by a user. When a paired mobile device receives a call, the table is searched per the caller number. A corresponding audio is played back first when an item is located in the table. As such a user of the Bluetooth headset knows who is calling and determines whether the call shall be answered or not.Type: GrantFiled: October 19, 2014Date of Patent: November 15, 2016Assignee: WUXI VIMICRO CORPORATIONInventors: David Xiao Dong Yang, Jian Chen, Feng Zhu, Yuhong Feng
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Patent number: 9286908Abstract: A method for noise reduction is provided including: beamforming audio signals sampled by a microphone array to get a signal with an enhanced target voice and a signal with a weakened target voice; locating a target voice in the audio signal sampled by the microphone array; determining a credibility of the target voice when the target voice is located; updating an adaptive filter coefficient according to the credibility, and filtering the signal with the enhanced target voice and the signal with the weakened target voice according to the updated adaptive filter coefficient to get a signal with reduced noise; and weighing a voice presence probability by the credibility, and enhancing the signal with reduced noise according to the weighed voice presence probability.Type: GrantFiled: November 7, 2013Date of Patent: March 15, 2016Assignee: VIMICRO CORPORATIONInventors: Chen Zhang, Yuhong Feng
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Patent number: 9236803Abstract: The prevent invention provides an AC-DC flyback converter and a loop compensation method thereof. The AD-DC flyback converter comprises an isolating transformer, a power switch, and a feed control module. The feed control module includes a compensating circuit, a voltage buffer, and an error amplifier having a first resistor and a second resistor, and a pulse width modulation controller. With the AC-DC flyback converter and the loop compensating method, the system stability can be improved and the loop bandwidth can be reduced.Type: GrantFiled: June 16, 2012Date of Patent: January 12, 2016Assignee: WUXI VIMICRO CORPORATIONInventors: Zhe Yang, Xianhui Dong, Zhao Wang
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Patent number: 9069526Abstract: Audio data processing method and an audio data processing system are described. The audio data processing system includes an audio collect module, a processing module, a virtual play module, a virtual collect module, and a buffer memory. The virtual play module and the virtual collect module are registered in an application interface layer of a third-part software. The third-part software chooses the virtual play module and the virtual collect module. The virtual play module is configured for receiving audio data processed by the processing module and storing the processed audio data in the buffer memory. The virtual collect module is configured for collecting the processed audio data from the buffer memory and transmitting the processed audio data to the third-part software. The invention provides a universal solution suitable for any chatting tool by installing the virtual speaker and the virtual microphone.Type: GrantFiled: December 24, 2011Date of Patent: June 30, 2015Assignee: Vimicro CorporationInventor: Hong Cao
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Patent number: 9070430Abstract: Designs of a sampling controller working with memory chips are described. The designs enable a memory chip to work in high frequency clocks, resulting in high data throughput rate. A data sampling device includes a memory chip and a sampling controller. The sampling controller includes an asynchronous data memory. A data writing port of the asynchronous data memory receives a clock signal and employs the clock signal as a writing clock to store the sampling data into an internal memory and activate a data reading port thereof to read and output the sampling data.Type: GrantFiled: September 12, 2011Date of Patent: June 30, 2015Assignee: Wuxi Vimicro CorporationInventor: Chuan Lin
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Patent number: 8843681Abstract: Method, system, bus arbitration device for accessing a memory are described. According to one embodiment, priorities of N function modules accessing the memory are compared to obtain location information of a function module with the highest priority. A bus of the function modules accessing the memory is switched to the function module with the highest priority by performing logic operation on the location information and bus information of each function module. Further, a bus arbitration device including a priority arbitration unit and a bus switching unit is described.Type: GrantFiled: September 12, 2011Date of Patent: September 23, 2014Assignee: Wuxi Vimicro CorporationInventor: Chuan Lin
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Patent number: 8760144Abstract: A multiple-input comparator is disclosed. The multiple-input comparator includes a pair of differential transistors connected by a resister. The gate terminals of the transistor pair serve as the input terminals of the comparator for receiving external voltage for comparison. The terminal of the resistor serves as the current input terminal and is either connected to a current source or a current sink. A power inverter utilizing the multiple-input comparator is also disclosed.Type: GrantFiled: June 28, 2010Date of Patent: June 24, 2014Assignee: Wuxi Vimicro CorporationInventors: Zhao Wang, Xianhui Dong, Dave Xiaodong Yang
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Publication number: 20140067386Abstract: A method for noise reduction is provided including: beamforming audio signals sampled by a microphone array to get a signal with an enhanced target voice and a signal with a weakened target voice; locating a target voice in the audio signal sampled by the microphone array; determining a credibility of the target voice when the target voice is located; updating an adaptive filter coefficient according to the credibility, and filtering the signal with the enhanced target voice and the signal with the weakened target voice according to the updated adaptive filter coefficient to get a signal with reduced noise; and weighing a voice presence probability by the credibility, and enhancing the signal with reduced noise according to the weighed voice presence probability.Type: ApplicationFiled: November 7, 2013Publication date: March 6, 2014Applicant: VIMICRO CORPORATIONInventors: Chen Zhang, Yuhong Feng
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Patent number: 8612217Abstract: Techniques pertaining to noise reduction are disclosed. According to one aspect of the present invention, noise in an audio signal is effectively reduced and a high quality of a target voice is recovered at the same time. In one embodiment, an array of microphones is used to sample the audio signal embedded with noise. The samples are processed according to a beamforming technique to get a signal with an enhanced target voice. A target voice is located in the audio signal sampled by the microphone array. A credibility of the target voice is determined when the target voice is located. The voice presence probability is weighted by the credibility. The signal with the enhanced target voice is enhanced according to the weighed voice presence probability.Type: GrantFiled: March 23, 2010Date of Patent: December 17, 2013Assignee: Vimicro CorporationInventors: Chen Zhang, Yuhong Feng
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Patent number: 8606381Abstract: Techniques pertaining to providing an appropriate recording mode to achieve optimum record data in accordance with the recording environment are described. In one embodiment, a current audio recording mode is initially selected to be one of a low sensitivity audio recording mode and a high sensitivity audio recording mode. A digital gain for digital audio recording data in the current audio recording mode is obtained. The current audio recording mode is automatically switched between the low sensitivity audio recording mode and the high sensitivity audio recording mode when the digital gain reaches a gain threshold.Type: GrantFiled: July 28, 2009Date of Patent: December 10, 2013Assignee: Wuxi Vimicro CorporationInventors: Chen Zhang, Yuhong Feng
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Patent number: 8407411Abstract: Techniques pertaining to adjusting the operation frequency of a DRAM are disclosed. According to one embodiment, the DRAM operation frequency adjusting system includes a statistic module counting effective operations of a DRAM to obtain a bandwidth utilization rate of the DRAM at a present operation frequency; a parameter configuration module including a target frequency configuration sub-module configured to generate a target operation frequency; and a frequency switch controller for switching a present operation frequency of the DRAM to the target operation frequency. The invention adjusts the operation frequency of a DRAM according to the application environment, and creates a balance between performance and power consumption of DRAMs, and thus improves operation speed of system-on-chips as well as decreases the power consumption.Type: GrantFiled: June 28, 2010Date of Patent: March 26, 2013Assignee: Wuxi Vimicro CorporationInventor: Chuan Lin
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Patent number: 8369633Abstract: Techniques pertaining to scalable video codec are disclosed. According to one aspect of the present invention, a video image is analyzed and a region of interest (ROI) and a region of non-interest (non-ROI) are identified. By comparing the non-ROI image with that of a previous image, a background ignored identifier is created indicating whether the non-ROI can be ignored during encoding and decoding processes. Based on the status of the background ignored identifier, the encoder encodes the images into a basic layer (BL) and an enhanced layer (EL), and transmits the coded bit streams along with the identifier to a decoder. The decoder reconstructs the image based on the identifier and the BL and the EL bit streams.Type: GrantFiled: October 23, 2009Date of Patent: February 5, 2013Assignee: Vimicro CorporationInventors: Jinghui Lu, Song Qiu, Hao Wang
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Patent number: 8315114Abstract: Techniques pertaining the designs of memory controller are disclosed. According to one aspect of the present invention, a memory controller reduces delays in a data strobe signal of a DDR memory relative to a clock signal of a memory controller thereof. In one embodiment, the memory controller employs four IO ports, two inverters, six edge triggers and a multiplexer. By feeding back an inverted clock signal and utilizing the rising and filing edges of the clock signal, the delays in a data strobe signal of a DDR memory relative to a clock signal of a memory controller are considerably reduced or minimized.Type: GrantFiled: May 25, 2010Date of Patent: November 20, 2012Assignee: Vimicro CorporationInventor: Chuan Lin
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Patent number: 8208629Abstract: Techniques pertaining to a security system are disclosed. According to one aspect of the techniques, secured communication of video data between a monitoring system including a monitoring camera and a monitoring terminal is established by encrypting the video data. The monitoring camera is configured to encrypt digital image data before the image data is transmitted to the monitoring terminal. Instead of using commonly used encryption schemes, encryption rules are generated in accordance with an encryption key corresponding to a predetermined encryption algorithm. On the side of the monitoring terminal, decryption rules are generated in accordance with a received description key corresponding to a predetermined decryption algorithm. Depending on implementation, the image data may be encrypted/decrypted line by line, block by block or frame by frame.Type: GrantFiled: November 20, 2007Date of Patent: June 26, 2012Assignee: Vimicro CorporationInventors: Lv Xie, Song Qiu
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Patent number: 8081146Abstract: The present invention discloses a multifunctional driver controller capable to drive one or more voltage-controlled devices or current-controlled devices. According to one embodiment, the multifunctional driver controller comprises a selection unit receiving a control signal, one of a first reference voltage and a second reference voltage, the selection unit selecting either one of the first reference voltage and the second reference voltage per the control signal, and a control circuit receiving a reference voltage from the selection unit and a feedback signal from a load being driven by a controlled analog signal from the control circuit, wherein the controlled analog signal is either a controlled voltage signal or a controlled current signal, the control circuit compares the reference voltage with the feedback signal and adjusts the controlled analog signal in reference to a difference between the reference voltage and the feedback signal until the feedback signal converges to the reference voltage.Type: GrantFiled: August 10, 2007Date of Patent: December 20, 2011Assignees: Vimicro Corporation, Wuxi Vimicro CorporationInventor: Zhao Wang
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Patent number: 8081410Abstract: Designs of an overcurrent protection circuit Techniques are disclosed. According to one aspect of the present invention, an overcurrent protection having continuous protection thresholds is provided to efficiently protect a battery from discharging overcurrent especially in all intermediate states.Type: GrantFiled: May 29, 2008Date of Patent: December 20, 2011Assignees: Vimicro Corporation, Wuxi Vimicro CorporationInventors: Zhao Wang, Hang Yin, Dave Xiao Dong Yang
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Patent number: 8072441Abstract: Techniques for detecting multiple touch points for touch screens are disclosed. A touch screen includes a first conductive layer and a second conductive layer, each conductive layer having a positive terminal and a negative terminal. Efficient operations of detecting multiple points on the touch screen are described using various voltage/currents differences from the positive and negative terminals of the first and second conductive layers.Type: GrantFiled: May 31, 2009Date of Patent: December 6, 2011Assignees: Vimicro Corporation, Wuxi Vimicro CorporationInventor: Chen Zhang
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Patent number: 7986499Abstract: Techniques pertaining to a voltage regulator with a current limiting circuit having low quiescent current are disclosed.Type: GrantFiled: December 23, 2008Date of Patent: July 26, 2011Assignees: Vimicro Corporation, Wuxi Vimicro CorporationInventors: Zhao Wang, Hang Yin, Wenbo Tian