Abstract: A sequential decoding method and a decoding apparatus are provided. According to the method, an open stack is adopted for storing a plurality of paths. When the codeword generated by an internal decoder in the decoding apparatus is incorrect, a codeword is generated again by using the paths stored in the open stack. Accordingly, the complexity of decoding is reduced.

Abstract: A system for simulating mobile phone and method thereof is provided. The system has separately designed man-machine-interface (MMI) kernel module, simulator module and plug-in module. If a designer wants to replace the MMI kernel module in a developing project, the present invention allows not only the transplantation and extension of code but also the integration with the existing simulator module. Besides, the plug-in module uses the inter-process communication (IPC) mechanism and the dynamic linking library (DLL) mechanism of the operating system of a host to exchange data with the simulator module and display a mobile phone operation interface so that the simulator module is able to support future plug-in module.

Abstract: A decoding method and system for real-time wireless channel estimation, which decodes a received signal with a noise. The received signal is coded by a concatenation code. At first, the received signal is performed a certain amount of decoding by a Max-Log-MAP decoding procedure. Next, an estimated amplitude of the received signal and an estimated variance of a noise are computed. Then, the received signal is adjusted in accordance with the estimated amplitude and the estimated variance to thereby produce an adjusted received signal. Finally, the adjusted received signal is decoded by a Log-Map decoding procedure.

Abstract: A multimedia apparatus has a function of detecting video signal connection. The multimedia apparatus includes plural video output terminals. The user may selectively connect one of the video output terminals with a TV set. The analog video signal outputted from the video output terminal is detected by a detector. In a case that the connection between the first video output terminal and the TV set is interrupted but the second video output terminal is connected with the TV set, the detector issues control signal. According to the control signal, a first digital-to-analog converter is disabled to stop outputting a first analog video signal through the first video output terminal, and a second digital-to-analog converter is enabled to output a second analog video signal through the second video output terminal.

Abstract: The present invention provides a system for selecting a sample phase based on channel capacity. A synchronizer calculates a carrier frequency offset, a sample timing offset, a sampling conversion rate and a frame timing, and counts the candidate sample phases. A digital mixer conducts frequency offset compensation to produce a frequency compensated baseband signal. An interpolator conducts interpolation to compensate and produce an interpolated baseband signal. A digital matched filter performs filtering to produce an over-sampled and filtered baseband signal. A buffer stores the over-sampled and filtered baseband signal. A channel estimator estimates and produces channel frequency responses. A sample phase selector calculates channel capacity corresponding to each candidate sample phase, and selects the one with maximum channel capacity. A down-sampler conducts down-sampling operation to produce the final symbol rate based baseband signal.

Abstract: A motor rotational speed control device for controlling a direct current (DC) brush motor is provided, which includes a motor driver, a detection unit and a central processing unit (CPU). The motor driver is coupled to a first control terminal and a second control terminal of the DC brush motor. The detection unit detects a back electromotive force (EMF) of the DC brush motor through the first control terminal and the second control terminal when the motor driver is set to a disable state, and accordingly generates back EMF information. The CPU determines whether the direct current brush motor has stopped rotating according to the back EMF information, and determines whether to generate a brake control signal according to a determination result. The motor driver reduces a rotation speed of the DC brush motor according to the brake control signal when the motor driver is set to an enable state.

Abstract: An electronic apparatus for recording data using a non-volatile memory is provided. The electronic apparatus includes a non-volatile memory and a controller. The non-volatile memory stores a plurality of sets of playing information of the electronic apparatus. The controller is coupled to the non-volatile memory for receiving an input data and transforming a data structure of the input data into a bitmapping data structure. The controller includes a bitmapping module that is capable of transforming the input data into data having at least one bit but less than one byte in a bitmapping manner.

Abstract: A portable electronic device is disclosed. The portable electronic device includes: an image capturing device, for capturing a first image; a focal distance measuring device, for measuring a plurality of focal distances corresponding to a plurality positions of the first image; a display device, for outputting a picture; and a motion detecting controller, for determining variations of the plurality of focal distances measured by the focal distance measuring device when the portable electronic device moves or rotates, and controlling the picture shown in the display device according to the variations of the plurality of focal distances.

Abstract: A method and device for acquiring a channel with a frequency offset less than half symbol rate is applied but not limited to a DVB-S system. A target channel is selected to obtain a carrier frequency and a symbol rate for programming a tuner to obtain a digital baseband signal. A down-sampling factor is calculated based on the symbol rate for performing a down-sampling operation to obtain a down-sampling signal that passes through a digital matched filter to generate a filtered spectrum. A moving average and spectrum inversion is applied to detect location of the target channel and find two cross points thereby estimating a coarse carrier frequency offset for compensating the tuner and a coarse symbol rate. A fine carrier frequency offset and a symbol rate estimate are estimated for compensating and acquiring the target channel when the target channel is successfully detected.

Abstract: A filter, including a direct-current (DC) tracking unit, a subtracter and a control unit, is provided. The DC tracking unit extracts a DC component of a radio-frequency (RF) signal and accordingly generates a level signal. The subtracter subtracts the level signal from the RF signal to generate a RF coupling signal. The control unit determines whether to transmit a setting signal to the DC tracking unit according to the level variation of the RF coupling signal, so as to adjust a characteristic parameter of the DC tracking unit.

Abstract: A clock range setting device including a horizontal counter, a filter unit, a clock detecting unit, a first infinite impulse filter (IIR filter), and a clock range modulator is provided. The horizontal counter counts a horizontal counter value. The filter unit obtains a lead clock of each teletext video signal according to a lead clock range, and generates a corresponding clock intermediate value. The clock detecting unit detects level changes of the lead clock of each teletext video signal according to the clock intermediate value, so as to generate a corresponding current clock cycle number. The first IIR filter generates corresponding number mean value according to the current clock cycle numbers sequentially received by the first IIR filter. The clock range modulator sets the lead clock range corresponding to each teletext video signal according to the current clock cycle number, the number mean value, and the horizontal counter value.

Abstract: An all digital phase locked loop circuit includes a reference frequency indicator for receiving a reference signal with a reference frequency and generating a frequency indicating value; a phase frequency detector for comparing the reference signal with a frequency divided signal and generating a phase difference pulse; a time-to-digital circuit for receiving the phase difference pulse and a plurality of output signals and generating a phase difference value; a digital controller for receiving the frequency indicating value and the phase difference value and generating a control value; a delta-sigma modulator for modulating the control value and generating a modulated control value; a DCO for receiving the modulated control value and generating an output oscillating signal with a digital controlled frequency; a frequency divider for dividing the digital controlled frequency to generate the frequency divided signal; and a multi-phase generator for receiving the output oscillating signal and generating the outp

Abstract: A channel estimation apparatus and the method thereof are disclosed. The channel estimation apparatus includes a time-domain-axis channel estimation unit, a peak-detection module, a first-shift unit, a frequency-domain-axis channel estimation unit and an optimal shift searching module. The time-domain-axis channel estimation unit is used for performing the channel estimation in the time domain so as to obtain initial channel frequency responses by estimating. The peak-detection module is used for outputting a peak information. The shift-optimal-searching module decides the optimal shift information according to the peak information, a feedback signal and entire channel frequency responses. The first-shift unit is used for adjusting the positions of the initial channel frequency responses in the time domain according to the optimal shift information.

Abstract: A highly linear variable-gain low noise amplifier is a cascode amplifier. The cascode amplifier includes a gain control circuit, a load circuit, a current steering circuit and an input circuit. The gain control circuit is used for receiving a gain adjusting voltage, thereby generating a resistance adjusting signal and a current steering control signal. The load circuit includes plural variable resistors. The resistances of the variable resistors are adjusted according to the resistance adjusting signal. The current steering circuit is connected to the load circuit through plural current paths for adjusting a current ratio between the plural current paths according to the current steering control signal. The current steering circuit has differential signal output terminals. The input circuit is connected to the current steering circuit. The input circuit has differential signal input terminals.

Abstract: An image scaling system includes a window memory, a longitudinal scaler, a buffer and a latitudinal scaler. The window memory temporarily stores partial data of N image lines. The longitudinal scaler performs a longitudinal scaling operation on the partial data of the N image lines to thereby produce partial data of a longitudinal image line. The latitudinal scaler performs a latitudinal scaling operation on the partial data of the longitudinal image line to thereby produce scaling-part data of a latitudinal image line. The longitudinal scaler and the latitudinal scaler use a window average to perform an image shrinking operation and a bi-linear interpolation average to perform an image expanding operation.

Abstract: A method for determining a type of a disk and an optical storage apparatus thereof are provided. The method includes when the disk placed in the optical storage device is not a blank disk, determining whether the phases between a first signal and a second signal of the disk are the same or not; and determining that the disk is a low to high (LTH) data disk or a high to low data disk (HTL) data disk upon whether the phases of the first signal and the second signal are the same or not. Therefore, the reading parameters are correspondingly loaded in the optical storage device according to the type of the disk.

Abstract: A document with indexes and associated document reader system. The document is constructed by printing plural pixels and divided into plural areas. Each of the areas has plural indexes respectively consisting of a group of indexing dots to represent an area code corresponding to the area. The indexes and the pixels have different optical reflection features. The system includes a filter, a pattern sensor and a pattern decoder. The filter allows a light with special wavelengths to pass through, so as to obtain a desired light corresponding to the indexes of the document. The sensor is connected to the filter for sensing the light passed through and accordingly forming a pattern to output. The decoder is connected to the sensor for decoding and thus obtaining corresponding indexes in accordance with the pattern outputted by the sensor.

Abstract: In a frequency synthesis system with self-calibrated loop stability and bandwidth, a detector produces a detection signal based on a difference between an input signal and a feedback signal; a charge pump produces a control signal based on the detection signal; a filter produces a tuning signal and a source current based on the control signal; a bias circuit produces first and second bias signals; a controllable oscillator produces a differential output signal with a selected specific frequency; a differential-to-single converter produces an output signal with the selected specific frequency; a programmable frequency divider produces the feedback signal; a current mirror circuit receives the source current for producing a mirror current; a compensation circuit produces a compensation current based on the mirror current for compensating the variation of the damping factor and the bandwidth-to-reference frequency ratio.

Abstract: A Universal Information Code (UIC) resolves the encoding limitation associated with the known 2D bar code format. The UIC includes at least a type field and an index field. The type field indicates application type and format of other fields. The index field provides an index to access a website, categories of information, keyword of information, index or link to associated information and expansion information. The UIC further includes optionally a text description field and an authorization field. The text description field can be used to include a textual description of the website. The authorization field can be used to store password or public key. A mobile terminal device equipped with camera can fetch an image of the 2D bar code in UIC format and then extract related fields for interactive information exchange with a database.

Abstract: An optical disc identifying device includes an optical pickup head, a digital signal processor and a radio frequency amplifier. The optical pickup head has a plurality of laser diodes and a lens. During a start-up procedure, a non-blue laser diode of the optical pickup head is turned on to irradiate a loaded optical disc, thereby generating an electronic signal. The digital signal processor outputs a driving signal, thereby controlling a motor driver to move the lens in a focusing direction. The radio frequency amplifier receives the electronic signal during the movement of the lens, thereby generating a first signal. The digital signal processor includes a detecting unit for comparing the first signal with a slicing signal to generate a pulse signal, and determining whether the optical disc is a blue-ray disc or a non-blue-ray disc according to a pulse number of the pulse signal.