Abstract: An audio output port, an impedance value detecting unit, a DAC, an audio gain module, and a processing unit are included within an electronic device. The impedance value detecting unit detects the impedance value of an audio output apparatus. The storage unit stores an audio output mode table. The processing unit determines the range of impedance values that the detected impedance value falls within, and determines the corresponding audio output mode, the processing unit operates in the audio output mode which is required. The audio gain module magnifies the analog signals with a gain value corresponding to the audio output mode required, and transmits the magnified analog signals to the audio output port. An audio output control method is also provided.

Abstract: An output controller and an method for outputting a signal flow to one or more earphone jacks according to a connection status of each earphone jack. The output controller includes an interface unit having more than one earphone jacks and an output control unit. The output control unit includes a signal input terminal for receiving a signal flow, a detector, and a determining module. The detector detects whether each earphone jack is connected with an earphone and outputs one or more detected signals representing the connection status of the earphone jacks. The determining module outputs the signal flow directly to the connected earphone jack if only one earphone jack is connected to the earphone or distributes the signal flow being amplified correspondingly into each connected earphone jack if more than one earphone jack is connected to the earphones.

Abstract: A master-slave system includes a master and a slave. The master includes a first communication interface, a master controller, and a voltage meter. The voltage meter is connected to the first communication interface and the master controller. The slave includes a second communication interface, an input unit, a slave controller, and a control indicator unit. The control indicator unit is connected to the second communication interface and the slave controller. The salve controller controls voltage of a node between the control indicator unit and the second communication interface to change between a high logic level and a low logic level according to signals from the input unit. The voltage meter is connected to the control indicator unit to detect the voltage of the node. The master controller controls the master to execute a function according to change of the obtained voltage within a preset period.

Abstract: A power supply circuit includes a voltage converting module, a detecting module, a processor, and a selecting module. The voltage converting module includes at least one output port, each of which is connected to one load circuit to form a loop circuit. The detecting module can be selectively connected to a selected one of the formed loop circuits to detect at least one parameter of the loop circuit. The processor controls the selecting module to connect the detecting module to the selected loop circuit, and further determines the current of the loop circuit according to the at least one parameter.

Abstract: An over-current protection circuit for preventing a function module from over-current, the function module obtains power from a power source via an input port. The over-current protection circuit includes a path switch, a current detection circuit, a conductor switch, a first control module, and a second control module. The current detection circuit and the path switch form a loop with the input port and the function module. The current detection circuit detects a value of a current of the loop, and produces a first control signal when detecting the current of the loop is equal to or greater than a predetermined current value. The first control module turns off the conductor switch when receiving the first control signal. The second control module turns off the path switch when the conductor switch is turned off, thereby cutting off the loop.

Abstract: An AC voltage detection circuit includes a conversion module, a comparison module, and a prompt module. The conversion module connects to an AC power source and converts the AC voltage provided by the AC power source to an AC current, and then converts the AC current to a direct current (DC) voltage reflecting the AC voltage. The comparison module is connected to the conversion module, and compares the DC voltage with a first predetermined voltage and a second lesser predetermined voltage, and produces a control signal when the DC voltage is greater than the first predetermined voltage or less than the second predetermined voltage. The prompt module produces a prompt signal when receiving the control signal.

Abstract: A temperature sensing system used to test the temperature of a surface of a to-be-tested object includes an image capturing unit to capture an image of a base supporting the to-be-tested object. A host obtains and displays the captured image, and maps the image to a coordinate system. Each point of the image corresponds to a coordinate of the coordinate system. The host further determines the coordinate of a selected point of the displayed image. A temperature sensing unit senses the temperature of the surface of the to-be-tested object according to the coordinate of the selected point of the displayed image. A method for sensing the temperature of surface of a to-be-tested object is also provided.

Abstract: An electronic device includes a main body, a cover hinged on the main body, a first sensor arranged in the main body, a second sensor arranged in the cover, and a processor. The first sensor senses a change of displacement of the first sensor when the main body is moved to generate a first coordinate information. The second sensor senses a change of displacement of the second sensor when the cover is moved to generate a second coordinate information. The processor calculates an angle between the main body and the cover according to the first coordinate information and the second coordinate information, and controls the electronic device according to the calculated angle. A method for controlling an electronic device is also provided.

Abstract: An electronic device includes a detecting unit, a proximity sensor and an unlocking unit. The detecting unit is used for detecting whether the electronic device is in a standby state, and generating a first signal when it is detected that the electronic device is in the standby state. The proximity sensor is used for sensing whether a person is proximate to the electronic device, and generates a second signal when it is determined the person is proximate to the electronic device. The unlocking unit is used for unlocking the electronic device when the first and second signals are generated within the same period of time.

Abstract: The cursor control device includes a housing, a first capacitor, a second capacitor, a first capacitance measurement unit, a second capacitance measurement unit, and a processor. Each capacitor includes a stator plate and a rotor plate. The rotor plates are movable relative to the stator plates. The stator plate and the rotor plate of the first capacitor are substantially perpendicular to the stator plate and the rotor plate of the second capacitor. The capacitance measurement units respectively measure the corresponding capacitance of the capacitors. The processor analyzes acceleration and duration of the changes in capacitance to ascertain movement direction and distance of the device according to the capacitance measured by the capacitance measurement units, when the capacitance between the stator plate and the rotor plate of the first capacitor, or between the stator plate and the rotor plate of the second capacitor changes.

Abstract: An assay device capable of assaying purity of a substance in an object includes a memory, an emitter, a receiver, a processing unit, and a display device. The memory stores names and standard densities of a number of substances. The emitter emits rays at the object. The receiver receives the rays reflected by the object. The processing unit calculates density of the object according to intensity of the emitted rays and intensity of the reflected rays. The processing unit further calculates purity of a selected substance in the object according to the density of the object and standard density of the selected substance stored in the memory, and outputs the calculated purity to the display device.

Abstract: An interface module includes an interface and a protection circuit. The interface includes a first input terminal for receiving a reference voltage representing ground (ground voltage), a second input terminal for receiving a power voltage, and a first output terminal for providing the ground voltage to a main circuit. The protection circuit includes a detection terminal for detecting the ground voltage of the first input terminal, a power input terminal for receiving the power voltage form the second input terminal, and a power output terminal for providing the power voltage to the main circuit.

Abstract: An exemplary personal listening device includes thermo-sensitive elements in its transducers. Each thermo-sensitive element senses temperature change of a corresponding transducer and changes a current flowing through the transducer according to temperature change of the transducer, to reflect the amount of time for which the personal listening device has been working.

Abstract: An electronic device includes a voice processing unit, a wireless communication unit, and a combining unit. The voice processing unit receives speech signals. The wireless communication unit sends the speech signals to a server. The server converts the speech signals into a text message. The wireless communication unit receives the text message from the server. The combining unit combines the text message and the speech signals into a combined message. The wireless communication unit further sends the combined message to a recipient. A related server is also provided.

Abstract: A touch-sensitive display apparatus includes a multi-touch screen, a processor, and a network unit. The processor controls the apparatus to enter a pulse rate measuring mode, records the number of the touched touch points in each scanning period, and determines a curve according to all the recorded numbers within a preset period, the number of wave crests of the curve, and pulse rates per minute according to the number of the wave crests. A related method is also provided.

Abstract: A scanning circuit includes n input ports K1˜Kn arranged in n rows L1˜Ln; and m?2 output ports W2˜(m?1) arranged in m columns P1˜Pm. The n rows and the m columns define a switch matrix including n*m switches. Ends of the switches in the same row are connected to one of the n input ports K1˜Kn, respectively. The ends of the switches in the column P1 are connected to ground. The ends of the switches in the same column of the columns P2˜P(m?1) are connected to a power supply VCC via resistors R2˜R(m?1) and the m?2 output ports W2˜W(m?1), respectively. The ends of the switches in the columns Pm are connected to ground via a resistor Rs and the power supply VCC via the resistors R2˜R(m?1) and diodes D2˜D(m?1), respectively.

Abstract: A resistance-measuring circuit includes a controller for outputting a PWM signal and further for adjusting the duty cycle of the PWM signal, and a sampling circuit for processing the PWM signal and transmitting the processed PWM signal to the sensor. The sampling circuit samples the signal outputted from the sensor to generate a sampled signal with the voltage thereof changing according to any change in the duty cycle of the PWM signal, and further transmits the sampled signal to the controller. The controller obtains the real-time duty cycle of the PWM signal when the voltage of the sampled signal reaches a threshold voltage, and further calculates the exact resistance of the sensor according to the obtained real-time duty cycle of the PWM signal and the threshold voltage. An electronic device with the resistance-measuring circuit is also provided.

Abstract: An ADC includes an analog signal input port for receiving analog signals, a reference voltage generation circuit for producing a reference voltage, a controllable switch, a control unit including a counter, an integral circuit, and a comparison circuit. The control unit outputs an on or off signal to turn on or turn off the controllable switch, the counter starts to count when the control unit outputs the off signal. The integral circuit executes an integral action to integrate the reference voltage and output a voltage enhanced gradually when the controllable switch is turned off. The comparison circuit outputs an interrupt signal to cause the counter to stop counting when comparing the voltage output by the integral circuit is higher than the voltage of the analog signals. The control unit determines a digital value corresponding to the analog signals according to a count value of counted by the counter.

Abstract: A game controller connected to a game console includes an input unit, a video access unit, a projection unit, an angle detection unit, and a processing unit. The input unit generates control signals according to user input for controlling games. The video access unit receives video signals from the game console. The projection unit includes a lens module to projects game images onto a projection surface and a driving module to adjust the projection direction of the lens module. The angle detection unit detects a tilt angle of the game controller. The processing unit controls game play according to the control signals and generates an adjusting signal including a change of the tilt angle. The adjusting signal is sent to the driving module to adjust the projection direction of the lens module.

Abstract: A scanning circuit includes n rows L1˜Ln, 2n columns P1-1˜P1-n and P2-1˜P2-n, and the n rows L1˜Ln and the n columns P1-1˜P1-n cooperatively form a switch matrix comprising n*n switches S1-1˜Sn-n, with ends of the switches in the same row electrically connected to one of n I/O ports K1˜Kn, respectively, the ends of the switches in the same column are electrically connected to ground via one resistor R1-1˜R1-n, respectively, each of resistors R2-1˜R2-n is electronically connected in one column of the columns P2-1˜P2-n, and connected between one of the I/O ports K1˜Kn and ground via one of the resistors R1-1˜R1-n, respectively. A keyboard and a scanning method are also provided.