Abstract: A method for use in encoding video data, including generating metric values for the video data based on a metric function and respective encoding parameters. At least one of the encoding parameters is selected on the basis of a desired quantity of encoded video data and a predetermined relationship between metric values and respective quantities of encoded video data.

Abstract: A control device applicable to an actuator and including a voltage detection unit and a limit switch control unit. The control device is inbuilt inside the actuator without any additional control circuit for the control of the limit switches and the detection of the input voltage range. The limit switches are used to limit the travel of an actuating member of the actuator so as to avoid collision of the mechanism. The voltage detection unit serves to detect the input voltage range to control the operation of the actuator. Accordingly, the mechanism or the motor is protected from damage due to excessively low or high input voltage. The limit switches are freely adjustable in position and protected from high current. Therefore, the contacts of the limit switches are not liable to damage and the lifetime of the limit switches is prolonged. The control device further has electronic brake effect.

Abstract: An overload current control circuit for a DC motor comprises: a DC motor, a DC power source, a power semiconductor assembly, and a sampling resistor that are connected in series. The overload current control circuit further comprises a voltage polarity switching circuit that is connected to a circuit between the sampling resistor and the overload protection and detection circuit to control the single polarity of the sampling voltage of the first and second terminals of the sampling resistor, so as to provide constant voltage potential to the overload protection and detection circuit, thus providing overload protection to the DC motor.

Abstract: An overload current control circuit for a DC motor comprises: a DC motor, a DC power source, a power semiconductor assembly, and a sampling resistor that are connected in series. The overload current control circuit further comprises a voltage polarity switching circuit that is connected to a circuit between the sampling resistor and the overload protection and detection circuit to control the single polarity of the sampling voltage of the first and second terminals of the sampling resistor, so as to provide constant voltage potential to the overload protection and detection circuit, thus providing overload protection to the DC motor.

Abstract: A DC motor with a rotation direction switching circuit comprises a second power semiconductor assembly and a first power semiconductor assembly which are switched on and off alternatively by changing the polarity of the DC power source, thus providing an electronic rotation direction switching method. The service life is prolonged and the replacement times relatively reduce, and as a result, the material cost and maintenance cost of the rotation direction switching circuit is reduced. Therefore, it can improve the willingness of the user to use the DC motor with the rotation direction switching circuit and relatively improve the economic value of the DC motor.