Patent application number | Description | Published |
20110090957 | VIDEO CODEC METHOD, VIDEO ENCODING DEVICE AND VIDEO DECODING DEVICE USING THE SAME - A video codec method synchronizes long term reference frames in a video encoding device and a video decoding device of a video communication system. The video encoding device encodes video frames to code streams in an inter-prediction mode and set the corresponding reference frames to non-committed long term reference frames. The video decoding device decodes the code streams using the corresponding reference frames, then transmits an acknowledgement of the non-committed long term reference frames to the video encoding device. The video encoding device sets the non-committed long term reference frames to committed long term reference frames, and encodes succeeding video frames in the inter-prediction mode using the committed long term reference frames. | 04-21-2011 |
20110185199 | EMBEDDED SYSTEM AND POWER SAVING METHOD THEREOF - An embedded system comprises a main chip generating a sleep signal, a network interface controller (MC) generating a wake-up signal, a microprogrammed control unit (MCU), a switch, and a power source. The MCU sends a closing signal upon receiving the wake-up signal and an opening signal upon receiving the sleep signal. The switch comprises a public terminal, a free terminal, and a control terminal. The free terminal connects to the main chip, the control terminal connects to the MCU, the public terminal connects to the free terminal upon receiving the closing signal, and the public terminal disconnects from the free terminal upon receiving the opening signal. The power source connects to the MC and the MCU to provide power, and further connects to the public terminal to provide power if the public terminal and the free terminal are connected, and stop power if disconnected. | 07-28-2011 |
20120042238 | EMBEDDED DEVICE AND THREE-DIMENSIONAL USER INTERFACE REALIZATION METHOD - A three-dimensional (3D) user interface in an embedded device supports programming languages which are supported by the X3D standard, and may embed an extensible 3D (X3D) file into a hypertext mark-up language (HTML) file using one of the programming language. Then the X3D file in the HTML file is parsed by a browser plug-in of the 3D user interface, and an open graphics library (Open GL) is converted to an open graphics library for embedded systems (Open GL ES). Furthermore, corresponding functions in the Open GL ES are executed according to the parsing results, to render a 3D scene defined by the X3D file in the HTML file. In addition, the HTML file and the 3D scene is output on a display of the embedded device. | 02-16-2012 |
Patent application number | Description | Published |
20080211471 | Adaptive leading-edge blanking circuit and method for switching mode power converter - In an adaptive leading-edge blanking circuit and method for a switching mode power converter, an inductor current of the converter is sensed and compared with a threshold to decide an end point of a leading-edge blanking time. Circuit and method are further provided for preventing the converter from entering pulse skipping mode, which employs a current trimming circuit in an oscillator for a PWM controller in the converter to reduce a charging current in the oscillator if the output voltage of the converter is excessively high, to thereby reduce the oscillator frequency and in turn lower the switching frequency of a high-side power switch of the converter. | 09-04-2008 |
20090051411 | Trimmer circuit and method - A trimmer circuit is so configured that an electronic device will break down to produce a high current to trim a fuse. The electronic device is selectively configured to have a breakdown voltage lower than an applied voltage, for the trigger of its breakdown to be controllable. In an embodiment, the electronic device is switched between two states having two breakdown voltages respectively, and the applied voltage is higher than one of the breakdown voltages and lower than the other one. | 02-26-2009 |
20100225249 | LED Driver with Direct AC-DC Conversion and Control, and Method and Integrated Circuit Therefor - The present invention discloses an LED driver with direct AC-DC conversion and control function, and a method and integrated circuit therefor. The LED driver comprises: a primary side circuit receiving rectified AC power, the primary side circuit including at least one power switch; a transformer coupled to the primary side circuit and controlled by the at least one power switch to convert a primary voltage to a secondary voltage which is supplied to an LED circuit; and a secondary side circuit coupled to the transformer, the secondary side circuit directly controlling current flowing through the LED circuit and sending a feedback signal to the primary side circuit to control the at least one power switch thereby. | 09-09-2010 |
20110012570 | Synchronous driver circuit and integrated circuit for use therein - The present invention discloses a synchronous driver circuit, comprising: an inductor having one end coupled to an input voltage; a first power transistor having one end coupled to the other end of the inductor and another end supplying an output voltage; a second power transistor having one end coupled to the other end of the inductor and another end coupled to ground; a control circuit for controlling the operation of the first and second power transistors; a gate driver coupled to the control circuit and having an output controlling the gate of the first power transistor; and a bootstrap capacitor having one end coupled to a voltage node and the other end coupled to the other end of the inductor, the voltage across the bootstrap capacitor being provided as the operational voltage of the gate driver. | 01-20-2011 |
20120019310 | TRIMMER CIRCUIT AND METHOD - A trimmer circuit is so configured that an electronic device will break down to produce a high current to trim a fuse. The electronic device is selectively configured to have a breakdown voltage lower than an applied voltage, for the trigger of its breakdown to be controllable. In an embodiment, the electronic device is switched between two states having two breakdown voltages respectively, and the applied voltage is higher than one of the breakdown voltages and lower than the other one. | 01-26-2012 |
Patent application number | Description | Published |
20090073827 | AUTOMATIC POWER CONTROL SYSTEM FOR OPTICAL DISC DRIVE AND METHOD THEREOF - An automatic power control system, a down sampling circuit and a down sampling method. The automatic power control system is incorporated in an optical disc drive comprising a laser diode for receiving a control signal to generate a laser beam; and a photodetector for detecting the laser beam to generate an analog input signal. The automatic power control system comprises an analog-to-digital converter, a down sampling circuit, a comparator, and a digital-to-analog converter. The analog-to-digital converter converts the analog input signal to digital data. The down sampling circuit, coupled to the analog-to-digital converter, comprises a down sampler, a counter, and a controller. The down sampler receives a predetermined amount of digital data to generate representation data. The counter, coupled to the down sampler, calculates the amount of digital data, and resets the down sampler when the amount equals or exceeds the predetermined count. The controller, coupled to the counter, disables the counter when the digital data is invalid. The comparator, coupled to the down sampling circuit, compares the representation data with predetermined target data to generate error data. The digital-to-analog converter, coupled to the comparator, converts the error data to analog to generate the control signal. | 03-19-2009 |
20090141755 | METHOD FOR CONTROLLING LASER POWER OF AN OPTICAL PICKUP UNIT - A method for controlling laser power of an optical pickup unit (OPU) includes: providing a first relationship between the laser power and a driving parameter, wherein the driving parameter is utilized for driving a laser diode (LD) of the OPU, and the first relationship corresponds to a first temperature; utilizing a temperature-related model to convert the first relationship into a second relationship between the laser power and the driving parameter, wherein the second relationship corresponds to a second temperature; and storing the first relationship for being utilized at the first temperature, and storing the second relationship for being utilized at the second temperature. | 06-04-2009 |
20090141759 | METHOD FOR DERIVING PRECISE CONTROL OVER LASER POWER OF AN OPTICAL PICKUP UNIT, AND ASSOCIATED AUTOMATIC POWER CALIBRATION CIRCUIT - A method for deriving precise control over laser power of an optical pickup unit (OPU) includes: providing an analog-to-digital converter (ADC) within an automatic power calibration (APC) circuit to derive a path gain and/or a path offset from the APC circuit; and selectively performing compensation according to the gain and/or the path offset, in order to maintain precision of a relationship between the laser power and a target command utilized for controlling the laser power. An associated APC circuit comprising an ADC and at least one compensation module is further provided. The ADC is utilized for deriving a path gain and/or a path offset from the APC circuit. The compensation module is utilized for selectively performing compensation according to the path gain and/or the path offset, in order to control the laser power by a target command. | 06-04-2009 |
20100219908 | DIGITAL TO ANALOG CONVERTING METHOD AND DIGITAL TO ANALOG CONVERTOR UTILIZING THE SAME - A digital to analog converter for converting a digital input signal provided by a host to an analog output signal includes a modulator receiving the digital input signal, modulating the digital input signal, and outputting a modulated signal, and a filtering circuit receiving the modulated signal, low pass filtering the modulated signal, and outputting the analog output signal to an output node. The filtering circuit includes a first switching circuit for adjusting the bandwidth of the filtering circuit according to a bandwidth switching signal. | 09-02-2010 |
20110255566 | METHOD FOR DERIVING PRECISE CONTROL OVER LASER POWER OF AN OPTICAL PICKUP UNIT, AND ASSOCIATED AUTOMATIC POWER CALIBRATION CIRCUIT - A method for deriving precise control over laser power of an optical pickup unit (OPU) includes: providing an analog-to-digital converter (ADC) within an automatic power calibration (APC) circuit to derive a path gain and/or a path offset from the APC circuit; and selectively performing compensation according to the gain and/or the path offset, in order to maintain precision of a relationship between the laser power and a target command utilized for controlling the laser power. An associated APC circuit comprising an ADC and at least one compensation module is further provided. The ADC is utilized for deriving a path gain and/or a path offset from the APC circuit. The compensation module is utilized for selectively performing compensation according to the path gain and/or the path offset, in order to control the laser power by a target command. | 10-20-2011 |
Patent application number | Description | Published |
20100149181 | VECTOR GRAPHICS SYSTEM AND VECTOR GRAPHICS RENDERING METHOD - The invention provides a vector graphics system. In one embodiment, the vector graphics system comprises a path rendering manager module and a rendering module. The path rendering manager module receives path data, calculates a changing rate of the path data, and selects a filling method from a tessellation filling method and a Stencil filling method according to the changing rate. The rendering module fills the path data according to the tessellation filling method when the filling method is the tessellation filling method, and fills the path data according to the Stencil filling method when the filling method is the Stencil filling method. | 06-17-2010 |
20120134644 | PLAYBACK APPARATUS, PLAYBACK METHOD, AND COMPUTER PROGRAM PRODUCT THEREOF - A playback apparatus, a playback method, and a computer program product thereof are provided. The playback apparatus is adapted to play a video dynamic image. The video dynamic image comprises a dynamic object. The dynamic object has a first selection frame, and moves with a velocity. The playback apparatus comprises a processing unit and an input unit. The processing unit is configured to expand the first selection frame to generate a second selection frame according to the velocity. The input unit is electrically connected to the processing unit and is configured to transmit a selection signal to the processing unit so that the processing unit selects the dynamic object by means of the second selection frame according to the selection signal. | 05-31-2012 |
20120187997 | CIRCUIT AND METHOD FOR PROVIDING ABSOLUTE INFORMATION FOR FLOATING GROUNDED INTEGRATED CIRCUIT - The present invention discloses a circuit and a method for providing absolute information for floating grounded integrated circuit. The method includes: receiving an absolute information sense signal carrying absolute information; converting the absolute information sense signal to a current signal; and generating an internal reference signal according to the current signal, wherein the internal reference signal or a relationship between the internal reference signal and a floating ground level is related to the absolute information. | 07-26-2012 |
Patent application number | Description | Published |
20110110205 | Apparatus for Controlling Servo Signal Gains of an Optical Disc Drive and Method of the Same - The invention provides an apparatus for controlling servo signal gains of an optical disc drive. The apparatus adjusts the gains of a plurality of servo signals controlling a servo system of the optical disc drive when the optical disk drive encounters an operating state transition. In a first mode, at least one AGC loop of the apparatus compensates the gains of the servo signals with a selectable bandwidth during a specific period after the operating state transition to accelerate the convergence of the servo signals. In a second mode, at least one AGC loop of the apparatus reloads the previously saved convergence values or pre-determined values as the initial values according to the current operating state immediately after the operating state transition to accelerate the convergence of the servo signals. | 05-12-2011 |
20110122747 | Automatic Power Control System for Optical Disc Drive and Method Thereof - An automatic power control system, an automatic power control method, a down sampling circuit and a down sampling method. The automatic power control system is incorporated in an optical disc drive comprising a laser diode for receiving a control signal to generate a laser beam; and a photodetector for detecting the laser beam to generate an analog input signal. The automatic power control system comprises an analog-to-digital converter, a down sampling circuit, a comparator, and a digital-to-analog converter. The analog-to-digital converter converts the analog input signal to digital data. The down sampling circuit, coupled to the analog-to-digital converter, comprises a down sampler, a counter, and a controller. The down sampler receives a predetermined amount of digital data to generate representation data. The counter, coupled to the down sampler, calculates the amount of digital data, and resets the down sampler when the amount equals or exceeds the predetermined count. The controller, coupled to the counter, disables the counter when the digital data is invalid. The comparator, coupled to the down sampling circuit, compares the representation data with predetermined target data to generate error data. The digital-to-analog converter, coupled to the comparator, converts the error data to analog to generate the control signal. | 05-26-2011 |
Patent application number | Description | Published |
20120234125 | Speed Control Device for Speed Changing Device of Bicycle - A speed control device, which is adapted to be used in connection with a derailleur type bicycle or internal gear hub type bicycle, has one operation mode for up-shifting the speed and another operation mode for down-shifting the speed. The two operation modes can be affected by an operation lever, and with the operation lever being pivoted in a second rotation direction for the up-shifting operation and in a first rotation direction for the down-shifting operation. | 09-20-2012 |
20120244977 | Bicycle cogset - A cogset, which is adapted to connect to a rotatable hub in a bicycle, comprises a cog assembly and a connective set installed to the cog assembly. The cog assembly includes at least one first cog, a second cog connected to the first cog, and a third cog connected to the first cog. Each of the first and second cogs are not directly connected to the rotatable hub. | 09-27-2012 |
20120244978 | Bicycle Cogset with Support Element - A cogset, which is adapted to connect to a rotatable hub in a bicycle, comprises a first cog, a second cog connected to the first cog, and a support element installed to the second cog. A limiting side of the support element is abutted against a side of the second cog. The support element is mounted by the first cog. Each of the first and second cogs is not directly connected to the rotatable hub. | 09-27-2012 |
Patent application number | Description | Published |
20120242238 | Light Emitting Device Power Supply Circuit, and Light Emitting Device Driver Circuit and Control Method Thereof - The present invention discloses a light emitting device power supply circuit, a light emitting device driver circuit and a control method thereof. The light emitting device driver circuit is coupled to a tri-electrode AC switch (TRIAC) dimmer circuit, and it controls the brightness of a light emitting device circuit according a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a light emitting device control circuit. The light emitting device control circuit generates a switch control signal. The power stage circuit operates at least one power switch thereof according to the switch control signal to generate a latching current for firing the TRIAC dimmer circuit, and the latching current is inputted to the light emitting device circuit. | 09-27-2012 |
20130114308 | Switching Regulator and Control Circuit and Control Method Thereof - The present invention discloses a switching regulator and a control circuit and a control method thereof. The control circuit of the switching regulator, which controls rectified power within a predetermined range, detects an input voltage and an input current to generate a voltage detection signal and a current detection signal respectively, and the voltage detection signal and the current detection signal are multiplied by one the other to generate a power index. The control circuit generates an error signal according to the power index and a reference signal. A low-pass-filter filters a high frequency band in the process. A control signal generation circuit of the control circuit generates a control signal according to the error signal. And a driver circuit of the control circuit generates an operation signal according to the control signal, for switching a power switch to convert the rectified power to an output voltage. | 05-09-2013 |
20130169177 | Active Bleeder Circuit Triggering TRIAC in All Phase and Light Emitting Device Power Supply Circuit and TRIAC Control Method Using the Active Bleeder Circuit - The present invention discloses an active bleeder circuit capable of triggering a tri-electrode AC switch (TRIAC) circuit in all phase. The active bleeder circuit receives a rectified signal having an OFF phase and an ON phase. The active bleeder includes: a detection circuit for generating a detection signal according to the rectified signal and accumulating the detection signal in the OFF phase of the rectified signal; and a current sinker circuit coupled to the detection circuit, for generates a latching current to trigger the TRIAC circuit by operating a switch when the detection signal exceeds a predetermined level. The present invention also discloses a light emitting device power supply circuit and a TRIAC control method using the active bleeder circuit. | 07-04-2013 |
20130169252 | Switching Regulator and Control Circuit and Control Method Thereof - The present invention discloses a switching regulator and a control circuit and a control method thereof. The switching regulator generates a compensation signal according to a feedback signal, and generates a driving signal according to the compensation signal, to control a power stage for converting an input voltage to an output voltage. The compensation signal is adjusted according to the input voltage, such that when the input voltage is equal to or lower than a predetermined level, the compensation signal is kept at a predetermined value. | 07-04-2013 |
20130215651 | Isolated Power Converter Circuit and Control Method Thereof - The present invention discloses an isolated power converter circuit and a control method thereof. The isolated power converter circuit includes: a transformer circuit, a power switch circuit, an opto-coupler circuit, and a control circuit. The transformer circuit includes a first winding and a second winding. The power switch circuit is coupled to the transformer circuit to control it according to a driving signal. The opto-coupler circuit generates a feedback signal. The control circuit is coupled to the power switch circuit and the opto-coupler circuit, for generating the driving signal according to the feedback signal. The control circuit includes a distinguishing circuit for distinguishing a status of the feedback signal. | 08-22-2013 |
20130221875 | LIGHT EMITTING DEVICE DRIVER CIRCUIT AND CONTROL METHOD THEREOF - The present invention discloses a light emitting device circuit and a control method thereof. The light emitting device circuit includes: a light emitting device control circuit, for converting an input voltage to an output voltage according to a control signal, wherein the output voltage is supplied to a light emitting device circuit; a voltage supply circuit, which is coupled to the light emitting device circuit, for generating a supply voltage from the output voltage; and a remote control circuit, which is coupled to the voltage supply circuit, for receiving the supply voltage, and generating the control signal according to a remote signal. | 08-29-2013 |
20130221978 | Light Emitting Device Control Circuit and Short Detection Circuit Thereof - The present invention discloses a light emitting device control circuit and a short detection circuit. The light emitting device control circuit controls a light emitting array which includes a plurality of light emitting device strings. Each light emitting device string includes a first terminal which is connected to a common node, a second terminal, and a plurality of light emitting devices connected in series. The light emitting device control circuit includes: a short detection circuit, coupled to the second terminals to receive second terminal signals from the second terminals, generating comparison signals according to whether the second terminal signals are higher than a reference signal, and generating a short detection signal according to whether a number of the comparison signals is between a first setting value and a second setting value. | 08-29-2013 |
20130250631 | POWER SUPPLY CIRCUIT WITH PFC FUNCTION, AND AUTOMATIC GAIN CONTROL CIRCUIT THEREFOR AND CONTROL METHOD THEREOF - The present invention discloses a power supply circuit with power factor correction (PFC) function, and an automatic gain control circuit therefor and a control method thereof. The power supply circuit includes the automatic gain control circuit and a load driver circuit. The automatic gain control circuit converts an input voltage to a regulation voltage, and the load driver circuit generates an output current according to the regulation voltage. The automatic gain control circuit automatically adjust the regulation voltage such that the regulation voltage has a substantially fixed amplitude or fixed average value under different input voltages of different specifications, and the output current provided by the load driver circuit varies in phase with the input voltage to provide a PFC function. | 09-26-2013 |
20140285109 | LIGHT EMITTING DEVICE DRIVER CIRCUIT AND CONTROL CIRCUIT AND CONTROL METHOD THEREOF - The present invention discloses a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit converts an input voltage to an output voltage, and provides an output current to a light emitting device circuit. The present invention detects whether the output voltage exceeds a predetermined level, and if no, the regulation target of the output current is set to a relatively higher current to fast charge an output capacitor; if yes, the output current is regulated to a desired target, wherein the relatively higher current is higher than the desired target. | 09-25-2014 |