Abstract: A 4× over-sampling data recovery system consists of a charge pump PLL, a 4× over-sampler, a data regenerator and a digital PLL. The charge pump PLL receives a clock signal and generates a plurality of multiplicative clock signals in response to the clock signal. The 4× over-sampler samples a serial data to generate a M-bit signal according to the plurality of multiplicative clock signals, wherein each bit in the serial data is sampled for four times. The data regenerator sequentially receives and combines two M-bit signals to generate a (M+N)-bit signal. The digital PLL divides the (M+N)-bit signal into (N+1) groups of M-bit data and selects a designated M-bit data from the (N+1) groups of M-bit data to generate a P-bit recovery data.

Abstract: A de-interlacing system includes a motion adaptive de-interlacer, a horizontal motion estimation device, a horizontal motion compensation device, a vertical motion detection device, a multiplexer, and a film signal detector. The film signal detector receives an input signal and decides whether the input signal is a video stream or a film stream to thereby select an output from the motion adaptive de-interlacer or the horizontal motion estimation and compensation device. Thus, a de-interlacing output has stable and smooth edges when a video stream is inputted, and the motion judder phenomenon is reduced when a film stream is inputted.

Abstract: A move-sled-home device is used in an optical disc drive. The move-sled-home device includes a processing unit, a motor actuator, a sled, a sled motor, and a current-detecting unit. The processing unit outputs a control signal. The motor actuator generates a driving voltage according to the control signal. The sled motor generates a driving current according to the driving voltage to move the sled. The current-detecting unit is used for receiving and converting the driving current into an indicating signal, and issuing the indicating signal to the processing unit. During a move-sled-home action, the processing unit realizes a magnitude of the driving current according to the indicating signal, thereby determining whether the move-sled-home action is finished.

Abstract: An apparatus for judging an optical disc includes a gain controller, an amplitude detecting unit and an amplitude comparing unit. The gain controller is used for receiving a radio frequency signal from an optical pickup head; and processing the radio frequency signal into an amplified radio frequency signal with a target amplitude according to an amplitude feedback signal. The amplitude detecting unit is used for receiving the amplified radio frequency signal, generating the amplitude feedback signal to the gain controller, and outputting a top envelope amplitude according to an top envelope signal of the amplified radio frequency signal. The amplitude comparing unit is used for comparing the top envelope amplitude with a threshold value to generate a resulting signal, and judging whether the laser beams emitted from the optical pickup head are irradiated on a blank area or a data-recorded area according to the resulting signal.

Abstract: A display frequency boosting system for increasing image display frequency includes a buffer to receive a first frame, a second frame, and a third frame of image data and store the frames in a form of zero to fifth fields, a motion estimation device to perform a motion estimation on the fields to produce a motion vector, an interpolator connected to the buffer to perform an interpolation on the fields to produce an interpolated field, a motion compensation device to perform a motion compensation according to the motion vector, the fields and the interpolated field to produce sixth and seventh fields, and a controller to control read and write operations of the buffer, wherein each frame is composed of an odd field and an even field, and a fourth frame corresponding to the sixth and the seventh fields locates between the first and second frames in a display time axis.

Abstract: A method for recovering video data in a disk when a reading error occurs is provided. First, the disk is scanned to obtain a next writable address (NWA) of a last video chapter previously recorded into the disk. An end address of a successfully recorded video chapter is then read from a specific area of the disk and stored into a memory. Next, when a disk player/recorder is requested to read content of data according to the NWA, the disk player/recorder determines whether the content of the data is a file system. If the content of the data is not a file system, the NWA obtained by scanning the disk is replaced with the end address read from the specific area to read the file system, so as to recover the video data in the disk. Thereby, the video data in the disk can be protected.

Abstract: In a decoding system and method for a high-density recording medium, a high protective codeword decoder decodes a burst indicator subcode (BIS) while a low protective codeword decoder decodes a long distance code, so as to eliminate the waiting time required for completely decoding all burst indicator subcodes (BISs) and starting the long-distance code (LDC) decoding. In addition, a first memory having a high access speed is implemented to store the BISs and corresponding BIS erasure indicators, and the access to a second memory have a lower access speed relative to the first memory is relatively reduced such that the bandwidth can be effectively used to thereby increase the decoding efficiency on the high-density recording medium.

Abstract: A differential offset circuit adapted for an adaptive filter of a receiver front end is provided. The differential offset circuit includes four controllable current sources which are respectively coupled to two differential output terminals of the adaptive filter. The current magnitudes of the controllable current sources are capable of being adjusted according to design requirements so that the differential offset of the adaptive filter is mitigated to avoid that the adaptive filter outputs a distorted signal to affect the accuracy of signal transmission.

Abstract: A method for detecting a thickness of an optical disc is provided. Firstly, a beam intensity signal and a focusing error signal are generated. Then, a first time interval for a focus point of the laser beam to move from a first layer to a second layer of the optical disc is acquired according to the beam intensity signal or the focusing error signal. Then, a second time interval between two peak values of an S curve of the focusing error signal is detected. Afterwards, the thickness between the first layer and the second layer is calculated according to a known S-curve detection range, the first time interval and the second time interval. The S-curve detection range is multiplied by said first time interval and divided by said second time interval to obtain the thickness between the first layer and the second layer of the optical disc.

Abstract: A system of edge direction detection for comb filter includes a buffer, first and second filters, first and second oblique detectors, and a comparator. The buffer receives and stores a composite signal. The first filter performs filtering operation on the composite signal to produce a first filter signal. The second filter performs filtering operation on the composite signal to produce a second filter signal. The first oblique detector detects an oblique in the first filter signal to produce a first oblique indication signal and a first oblique direction signal and output a first minimum oblique difference. The second oblique detector detects an oblique in the second filter signal to produce a second oblique indication signal and a second oblique direction signal and output a second minimum oblique difference. The comparator compares the first and second oblique indication signals and the first and second oblique direction signals to produce edge information.

Abstract: A signal to noise power ratio estimation system for multi-carrier communication includes a phase rotator, a power estimator, a channel gain calculator, an average and selection device, a combination and calculation device and a decibel (dB) transformation device. The signal to noise power ratio estimation system makes use of a transmit parameter signaling or pilot subcarriers to blindly assist in the signal to noise power ratio estimation to accordingly gain an estimated signal to noise power ratio accurately, and thus a communication system can be calibrated to a preferred condition.

Abstract: A motion vector estimator for reducing film judder measures a motion vector of a block of an image. A motion vector selection device receives a plurality of motion vectors and generates N candidate vectors based on a motion estimation stage signal. N block matchmakers are connected to the motion vector selection device in order to generate N matching costs based on the N candidate vectors. A motion vector determinator is connected to the N block matchmakers and the motion vector selection device in order to determine an output motion vector of the block based on the N matching costs.

Abstract: The present invention relates to a method for detecting a blank area of a power calibration area. The method includes the steps of: selecting a recording test area in the power calibration area; writing the recording test area with multiple stages of normal power and detecting power; forming multiple normal blocks and detecting blocks, wherein each of the detecting blocks includes one unit of unrecorded block and one unit of recorded block; and reading information from the unrecorded blocks of the detecting blocks and thus determining whether the unrecorded blocks of the detecting blocks are blank or not. Once all the unrecorded blocks of the detecting blocks are determined to be blank, it represents that the selected recording test area is totally blank.

Abstract: A memory access system for optimizing SDRAM bandwidth includes a memory command processor, and an SDRAM interface and protocol controller. The memory command processor is connected to a memory bus arbiter and data switch circuit for receiving memory access commands outputted by the memory bus arbiter and data switch circuit and converting the memory access commands into reordered SDRAM commands. The SDRAM interface and protocol controller is connected to the memory command processor for receiving and executing the reordered SDRAM commands based on protocol and timing of SDRAM. The memory command processor decodes the memory access commands into general SDRAM commands or alternative SDRAM commands. The memory access commands decoded into alternative SDRAM commands are generated by a specific bus master.

Abstract: A line driver includes the following. A current replication unit replicates a reference current according to an input signal. A current mapping unit adjusts a number of P channel transistors connected in parallel and inside the current mapping unit according to control information, so as to amplify the reference current according to a magnification value. A first resistor is electrically connected between the current replication unit and a direct-current voltage. A second resistor is electrically connected to the current replication unit and the current mapping unit and generates an output signal. A signal detection unit performs integration on a part of a difference between the input signal and the output signal, thereby generating an integration signal. A magnification control unit gradually adjusts magnification information related to a reference signal, and updates the control information by the magnification information when the reference signal is equal to the integration signal.

Abstract: A horizontal synchronization signal detection system includes a coarse period estimator and a fine period time estimator. The coarse period estimator estimates a minimum value and corresponding position of each period of a CVBS signal to calculate a coarse period of a horizontal synchronization signal. The fine period time estimator divides the horizontal synchronization signal into a first part and a second part so as to generate a first sum and a second sum by adding signals of the first part and the second part, and detects a middle point of the horizontal synchronization signal when the first sum equals the second sum. The steps of fine-tuning the coarse period to generate a fine-tuned coarse period, extracting the horizontal synchronization signal according to the fine-tuned coarse period, and determining whether the first sum is equal to the second sum are repeatedly executed until the first sum equals the second sum.

Abstract: In an optimal recording power calibration method for improving seeking stability on a recording power calibration area, a specific area serves as a data recording area during an optimal recording power calibration, wherein a length of the specific area is such that a plurality of times of optimal recording power calibrations can be performed. The method includes: an optimal recording power calibration step of recording, with different recording power, a first length of calibration data in the specific area, and calibrating optimal recording power, wherein a data sector recorded in this step is defined as a calibration recording sector; and a data recording step of recording, with data recording power, a second length of information having a logical address beside the calibration recording sector of the specific area, wherein a data sector recorded in the step is defined as an information recording sector.

Abstract: The present invention relates to methods for on-line calibrating output power of an optical pick-up. A power adjusting circuit of the optical pick-up has an optical power regulator and an optical power detector. The on-line output power calibrating method includes the steps of: performing a recording pre-process; providing a focus offset value and/or a tilt offset value to the optical pick-up; providing a setting value, corresponding to power under test, to the optical power regulator; detecting laser power emitted from the optical pick-up using the optical power detector; comparing the laser power with the power under test to adjust the setting value of the optical power regulator corresponding to the power under test; and performing an optimum power calibration if the laser power emitted from the optical pick-up conforms to the power under test.

Abstract: A control method for a TV system is provided. The TV system has a digital signal port connected to a player. The control method includes the following steps. After the TV system is turned on, a first set value is written into an EDID rewritable memory of the TV system. After the player is connected to the TV system, the TV system judges whether a quality of the first digital signal group is good or bad. If the quality of the first digital signal group is good, a video/audio signal is issued by the TV system according to the first digital signal group. Whereas, if the quality of the first digital signal group is bad, a second set value is written into the EDID rewritable memory.

Abstract: A nine-square virtual input system includes a nine-square virtual keyboard having multiple subsidiary nine-square grids. There is a main-location subsidiary nine-square grid, and each subsidiary nine-square grid has virtual keys corresponding to predefined symbols or user options respectively. A display device displays the virtual keyboard. A remote control controls the display device and has an input function key, a set of direction keys, and a set of digit keys. By pressing the input function key, the display displays the virtual keyboard in an OSD manner. By pressing the set of direction keys, an input focus is moved among the subsidiary nine-square grids, and then by pressing the set of digit keys to select a virtual key, the predefined symbol or user option corresponding to the selected virtual key is inputted.