Anpec Electronics Corporation

Yun-Li Liu

Che-Chang Chang

Te-Sheng Chen

Yuan-Hung Wang

Ke-Horng Chen

Wei-Chih Wang

Shin-Hao Chen

Ruei-hung Chiou

Shen-Yu Peng

Yi-Ping Su

A dimming control system having an asynchronous pulse width modulation mechanism is provided. When a transition in a level of a synchronous signal meets a specified transition, a width of a pulse wave that is currently generated in a pulse width modulation signal may not reach a preset pulse width. Under this condition, the dimming control system delays generating subsequent pulse waves of the pulse width modulation signal until the width of the pulse wave that is currently generated reaches the preset pulse width. Alternatively, the dimming control system forcibly transits the pulse wave that is currently generated from a high level to a low level to stop increasing the width of the pulse wave, maintains the pulse wave as an incomplete pulse wave, and increases widths of one or more of the subsequent pulse waves of the pulse width modulation signal.

Dimming control system having asynchronous pulse width modulation mechanism

A hub transmission direction control method, a hub and a control circuit are provided. The method includes processes of: detecting a clock signal of a host serial clock line; starting timing when the clock signal meets a trigger condition; when the timed time reaches a preset time, detecting a host data signal of a host data line communicated with a host device and a local data signal of a local data line communicated with a local device; and setting, according to a detection result of the host data signal and the local data signal, a first transmission direction in which data is transmitted from the host data line to the local data line, or a second transmission direction in which data is transmitted from the local data line to the host data line, as a transmission direction between the host data line and the local data line.

Hub transmission direction control method, hub and control circuit

A method of adjusting brightness of a display device is provided. The method includes steps of: generating a synchronization signal having a plurality of periods each of which is a frame time; determining bit values of dithering data according to target brightness data; and determining how many pulse waves in the pulse wave width modulation signal need to be modulated within the frame time according to the bit values of the dithering data, and accordingly modulating widths of the pulse waves of the pulse wave width modulation signal.

Method of adjusting brightness of display device

A system of driving and controlling a motor is provided. A main controller adjusts frequencies of all or some of pulse waves of an initial pulse width modulation signal to output a pulse width modulation signal according to instruction information. The adjusted frequency of each of the pulse waves is equal to a first preset frequency or a second preset frequency. When a motor driver drives the motor to stably rotate, the motor driver decodes each of the pulse waves having the first preset frequency into a first message and decodes each of the pulse waves having the second preset frequency into a second message. The motor driver arranges and combines all of the first messages and the second messages that are decoded from the pulse waves to obtain the instruction information. The motor driver executes an operation instructed by the instruction information.

System of driving and controlling motor

A system and a method of demodulating a frequency shift keying signal are provided. The method includes steps of: inputting the frequency shift keying signal; accumulating cycles of the frequency shift keying signal to a reference cycle number from a time point; finding an initial point of each of pulse waves of the frequency shift keying signal; accumulating the cycles to the reference cycle number multiple times from the initial point and extracting data of each accumulation; determining whether or not the number of times of extracting the data reaches a preset value, if not, returning to the previous step, if yes, performing the next step; determining whether or not a difference between the data is larger than a threshold, if not, outputting a first bit value, if yes, outputting a second bit value; and packing the first and second bit values into a demodulated signal.

System and method of demodulating frequency shift keying signal

A power management system coupled to a speaker module includes a monitor module for measuring a current signal and a voltage signal of the speaker module to obtain a real-time impedance information of the speaker module; a reception module for receiving a time-domain audio analogy signal to be transformed into a frequency-domain audio digital signal; a prediction module for generating a power prediction information according to an initial audio information, the real-time impedance information and the audio digital signal; a control module for generating a control signal according to the audio digital signal and a human hearing model information; and a power adjustment module for outputting an adjustment audio signal to the speaker module according to the power prediction information, the audio digital signal and the control signal, so as to perform a broadcast operation of the speaker module.

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Hsinchu, Taiwan

Yun-Li Liu