Abstract:
A fingerprint detection circuit and an electronic device are provided. The fingerprint detection circuit, configured to apply an excitation signal to a finger so as to generate a finger capacitor, the fingerprint detection circuit including: a signal amplifier having a negative input terminal connected with the finger capacitor, a positive input terminal connected with a voltage reference terminal, and an output terminal to output an output voltage according to a capacitance value of the finger capacitor; a capacitor; and a switch unit connected with the negative input terminal and the output terminal of the signal amplifier respectively, and configured to control the capacitor to be connected between the negative input terminal and the output terminal of the signal amplifier, such that the output voltage has a non-linear relationship with the capacitance value of the finger capacitor.
Abstract:
A capacitance detecting device for fingerprint identification comprises a conductive border (200), a detecting screen (100) and a detecting module (300). The detecting screen (100) comprises a plurality of detecting units (110). Each detecting unit (110) comprises a first conductive layer (111), a second conductive layer (112), a third conductive layer (113) and a fourth conductive layer (114). The detecting module (300) is configured to charge a sensing capacitance between the first conductive layer (111) and a finger (5) in contact with the detecting screen (100) and a feedback capacitance between the first conductive layer (111) and the second conductive layer (112) at a sampling stage, to control electric charges of the sensing capacitance and the feedback capacitance to transfer to an integrating capacitance between the third conductive layer (113) and the fourth conductive layer (114) at an integral stage, to measure a voltage variation of the integrating capacitance at the integral stage and to calculate the sensing capacitance according to the voltage variation. A fingerprint identification apparatus is also provided.
Abstract:
A touch detecting method, a touch detecting assembly, a touch sensitive device and a portable electronic apparatus are provided. The touch sensitive device comprises: a substrate (100); a plurality of induction units (200) not intersecting with each other, each induction unit (200) comprising a first electrode (210) and a second electrode (220); and a control chip (300) connected with the first electrodes (210) and the second electrodes (220) respectively. The control chip (300) is configured to applying a level signal to the first electrodes (210) and/or the second electrodes (220) to charge a self capacitor, to calculate a ratio between a first resistor and a second resistor when the touch is detected on the induction unit (200), and to determine a touch position according to the ratio between the first resistor and the second resistor.
Abstract:
A method of identifying a translation gesture and a device using the same are provided. The method may comprise: detecting one or more induction signals induced by one or more pointing objects that come into contact with a touch-sensitive surface in at least one direction; determining the number of the pointing objects that come into contact with the touch-sensitive surface; recording a touch status and a movement track of each pointing object if the number of the pointing objects is larger than a predetermined number; determining whether the pointing objects move in a same direction according to the touch status and the movement track of each pointing object; and determining that the pointing objects perform a translation gesture if the pointing objects move in the same direction.
Abstract:
A dimming controlling circuit for LED comprises: a switch (S0) configured to connect a main circuit (50) and a power grid; a switch-on duration controlling circuit (10) configured to output a switch-on duration controlling signals according to action times of the switch (S0); a switch-off controlling circuit (20) configured to output a switch-off controlling signal according to a comparison result of the voltages of the switch-on duration controlling signal and of a signal from a terminal of a switch transistor (M1) in the main circuit (50); a switch-on controlling circuit (30) configured to generate a switch-on controlling signal after a first preset duration since receiving the switch-off controlling signal; and a logic unit (40) configured to output a switch transistor controlling signal. The dimming controlling circuit for LED of the present disclosure is simple in structure and a manufacturing cost is low.
Abstract:
A method for eliminating background noise may comprise a) detecting a characteristic value of an audio signal to obtain a characteristic signal reflecting a change trend of the audio signal; b) multiplying the characteristic signal and the audio signal to obtain a product signal; and c) 5 amplifying the product signal proportionally and outputting the amplified product signal. A device for eliminating background noise is also disclosed.
Abstract:
The present invention provides a touchpad comprising a double-layer printed circuit board and an insulating layer attached onto the upper layer of the board, the board comprises an upper layer and a lower layer, the upper layer comprises a plurality of first axial conductive units, a first axial conductive wire, and a plurality of second axial conductive units, the lower layer comprises a wire connecting zone and a component zone defined by the wire connecting zone, the wire connecting zone includes a wire; a first conductor; and a second conductor; the plurality of first and second axial conductive units are serially-connected via the first and second axial conductive wires respectively; and the second axial conductive wire is electrically coupled to the second axial conductive units via the second conductor. According to the present invention, the manufacturing process is simple and the cost is low.
Abstract:
The present invention discloses a microphone, which may comprise an inner unit comprising a microphone module; a driver module coupled to the microphone module; a noise cancellation module coupled to the driver module; and a housing for accommodating the inner unit. At least two modules selected from the microphone module, the driver module and the noise cancellation module may be integrated in a chip. The microphone according to the present invention has a smaller volume with reduced technical complexity.
Abstract:
A method for eliminating background noise and a device thereof are provided. The method may comprise the steps of : detecting an effective value of a received audio signal to generate an output signal corresponding to an average power of the received audio signal (step A); generating a noise eliminating control signal by comparing the output signal corresponding to the average power signal with first threshold determined based on the difference between an average power of the voice signal and an average power of the noise signal (step B); eliminating the noise signal from the received audio signal, and amplifying the voice signal in the received audio signal with the control of the noise eliminating control signal. Based on the method and device, the background noise may be eliminated effectively.
Abstract:
A method for controlling SRAM data read-write, an integrated circuit and a LCD device having the integrated circuit are provided. The method comprises the following steps: writing data into a SRAM in series when a serial read-write pulse signal is at valid level; performing AND operation or OR operation between the serial read-write pulse signal and an internal scan clock signal in the SRAM to generate a parallel read pulse signal, and setting the valid level of the parallel read pulse signal as reverse to the valid level of the serial read-write pulse signal; and reading out the data from the SRAM in parallel when both the internal scan clock signal and the parallel read pulse signal are at valid levels. By setting the valid level of the serial read-write pulse signal and the valid level of the parallel read pulse signal to occur in alternate, the method prevents time sequence conflict between serial read-write and parallel read, and thereby ensures correct data read-write.