Abstract: The present disclosure provides an audio signal amplifying circuit for an electronic device including a processing chip and a speaker. The audio signal amplifying circuit includes an amplifying circuit and an inverting circuit connected to the processing chip to get a first control signal and invert the first control signal to generate a second control signal. The first control signal and/or the second control signal are used to control the operation mode of the amplifying circuit to be in an amplifying mode or in a non-amplifying mode.

Abstract: A computerized font size adjustment method of an electronic device, the electronic device includes an image capturing device. Images of a user are captured using the image capturing device at intervals. A smallest rectangle framing an eye portion of a current image of the user and a ratio of a length to a width of the smallest rectangle are calculated. Then the ratio is compared with a predetermined value range, and the font size of the electronic device is adjusted according to the comparison.

Abstract: In a method for detecting working states of I/O pins of electronic components, a signal is transmitted between at least two of the I/O pins. A probe of an oscilloscope is connected to an I/O pin. A waveform of the signal through the I/O pin is detected. Charges are transmitted to the probe. A working state of the I/O pin is determined by detecting whether the waveform of the signal through the I/O pin is changed when the charges are transmitted to the probe.

Abstract: An communication circuit of a communication device includes an interface unit, a direct current (DC) control circuit, a voice output circuit includes a voice input terminal, and a voice receiving circuit includes a voice output terminal. The interface unit outputs human speech and receives human speech from another communication device. The DC control circuit provides a constant current for the optocoupler circuit. When the outgoing human speech is coupled to the DC control circuit by a first optocoupler and sent to another communication device and incoming human speech is transmitted from the other communication device via the DC control circuit and a second optocoupler, echoes and extraneous noise in the speech is reduced.

Abstract: An alarm clock system includes an alarm clock setting module, an alarm clock recording module, an alarm clock studying module, a controlling module and an alarm clock. The alarm clock setting module allows a user to set alarm times at which the alarm clock is activated. The alarm clock recording module records the alarm times set by the user during a time period. The alarm clock studying module analyzes the alarm times to determine a regular repeated pattern of the alarm times and a period of the repeated pattern. The controlling module controls the alarm clock setting module to automatically set alarm times for following days in a subsequent period according to the determined pattern of the alarm times and the period of the repeated pattern. A cellphone employing the alarm clock system is also described.

Abstract: A touch input device includes a primary touch panel, a primary touch driver, an environment compensation unit, a processor, and an operation module. The primary touch panel generates a first change of electric charge distribution according to a touch on the primary touch panel from a user. The primary touch driver generates a touch signal according to the first change of electric charge distribution to the primary touch panel. The environment compensation unit detects a second change of electric charge distribution of an environment and generates a compensating signal. The processor processes the touch signal and the compensating signal to produce a reliable touch signal. The operation module performs a function according to the reliable touch signal.

Abstract: A communication terminal device includes a magnetic sensor, a processor, and a power control module. The magnetic sensor detects a current magnetic field generated by induction of internal current in internal circuits of the communication terminal device, and provides a value of strength of the current magnetic field to the processor. The processor compares the value of the strength of the current magnetic field with preset values, and obtains a comparison result. In a situation that the processor determines that the current magnetic field is anomalous according to the comparison result, the processor controls the power control module to withhold power to the communication terminal device.

Abstract: A font adjusting method employed in an electronic device. The electronic device includes a display screen and a sensor. The method includes detecting a moving state of the electronic device by the sensor when the display screen is turned on; enlarging a font size of text displayed on the electronic device when the electronic device is in a moving state; and controlling the display screen of the electronic device to use the enlarged font size.

Abstract: An embedded system includes an ARM processor and a number of b-bit peripheral processors connected to the ARM processor through a converting chip. The ARM processor includes pins P0˜Pa-1 divided into teams T1˜TN, each of which includes b pins, a and b are integral multiple of 8, wherein a=N×b. The number of the peripheral processors is N and each team corresponds to one peripheral processor. The converting chip reads an a-bit data from the ARM processor, converts the data into a plurality of b-bit data, and transfers each b-bit data to a peripheral processor, where the number of the b-bit data is N. The converting chip further reads one b-bit data from each peripheral processor in sequence, converts the read plurality of b-bit data into an a-bit data, and transfers the a-bit data to the ARM processor.

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: A method protects personal data of an electronic device. Different capacitance values between a plurality of points of a fingertip and an electrode layer of a capacitive touch screen of the electronic device are detectable when the capacitive touch screen is touched by the fingertip, and a representation of a fingerprint is acquired according to distribution of the detected capacitance values. If the acquired fingerprint does not match with any predetermined fingerprint, predetermined personal data of the electronic device is protected. If the acquired fingerprint matches with at least one of the predetermined fingerprints, the protection of the personal data is released.

Abstract: A communication device includes a communication unit, a speech recognition module, and a processor. The communication unit builds a communication between the communication unit and an external communication device. The processor records speech between the communication device and the external communication device. The speech recognition module compares each word of the recorded speech with voice samples to determine whether numbers have been spoken. The processor further determines if successive numbers are recorded in a predetermined period, and stores the successive numeric in a storage unit.

Abstract: An exemplary mobile phone is for determining a using state of each of other mobile phones communicatively connected with the mobile phone. The mobile phone includes a first communicating unit, a power switch, a using state determining unit, a second communicating unit, and a control unit. The using state determining unit determines the using state of the mobile phone by monitoring the first communicating unit and the power switch. The control unit controls the second communicating unit to transmit a contact ID and the using state of the mobile phone to a mobile switching center (MSC) via a base station (BS). Each one of the other mobile phones obtains the using state of the mobile phone from the MSC by transmitting the contact ID of the mobile phone via the BS, and updates the using state of the contact ID in the address list with the obtained using state.

Abstract: A light control signal generating circuit includes a photosensitive element, two transistors, and four resistances. A first resistance and the photosensitive element are connected in series between a power voltage terminal and a ground terminal. A base electrode of a first transistor is connected to a node between the first resistance and the photosensitive element, a collecting electrode is connected to the power voltage terminal through a second resistance, and an emitting electrode is connected to the ground terminal through a third resistance. A base electrode of a second transistor is connected to a node between the second resistance and the first transistor, a collecting electrode is connected to the power voltage terminal through a fourth resistance, and an emitting electrode is connected to the ground terminal through the third resistance. An output terminal is formed from a node between the fourth resistance and the second transistor.

Abstract: A current leakage protection circuit includes a first input terminal, a second input terminal for receiving a power voltage and a current leakage detection terminal configured for detecting a current leakage from an electronic device. A control circuit of the current leakage protection circuit is configured for providing a control signal to control a first switch circuit to switch off a first connection between the first input terminal and a first output terminal and to control a second switch circuit to switch off a second connection between the second input terminal and a second output terminal when the current leakage detection terminal detects current leakage of the electronic device.

Abstract: A volume adjustment circuit includes an amplification circuit, a control circuit and an adjustment circuit. The amplification circuit amplifies a first audio signal received and generates a second audio signal, and outputs the second audio signal to an audio output terminal. The control circuit is electrically coupled to the audio output terminal, and is configured to generate a control signal based on the second audio signal. The adjustment circuit is electrically coupled to the control circuit, and configured to adjust an amplitude of the first audio signal inputted to the amplification circuit based on the control signal.

Abstract: A telephone switchboard provides various operating voltages to a telephone in different operation modes. The telephone switchboard includes a control unit, an output control circuit and a voltage converter. The control unit detects the operation mode of a telephone and generates control signals to the output control unit. The output control unit controls direction of current flowing through the telephone according to the control signal, and generates a feedback signal according to any change in the operation mode of the telephone. The voltage converter receives the feedback signal and converts the received power to a suitable output operation voltage according to the feedback signal. The telephone switchboard is capable of providing various operation voltages to the telephone in the different operation modes.

Abstract: A digital communication system comprising a host and a client, the host calls the client via two transmission lines. The host includes a processor, a first control unit, a second control unit, a high frequency transformer and an interface unit. The digital communication system utilizes the first control unit and the high frequency transformer to modulate outgoing signals. The digital communication system utilizes the second unit and the high frequency transformer to demodulate incoming signals.

Abstract: A charging circuit for a battery includes an input terminal configured for providing a charging voltage, a switching unit connected between the input terminal and the battery, and a protection unit. The protection unit is configured for detecting a voltage of the battery and determining whether the voltage of the battery less than a predetermined voltage and controlling the switching unit to activate or terminate charging of the battery.

Abstract: A telephone switchboard provides various operating voltages to a telephone in different operation modes. The telephone switchboard includes a control unit, an output control circuit and a voltage converter. The control unit detects the operation mode of a telephone and generates control signals to the output control unit. The output control unit controls direction of current flowing through the telephone according to the control signal, and generates a feedback signal according to any change in the operation mode of the telephone. The voltage converter receives the feedback signal and converts the received power to a suitable output operation voltage according to the feedback signal. The telephone switchboard is capable of providing various operation voltages to the telephone in the different operation modes.