36results about How to "Improve signal detection accuracy" patented technology

The invention relates to an intelligent household health management device. The intelligent household health management device comprises a health information collection device, a health information analysis circuit, a seat for bearing a person and armrests on the two sides of the seat, wherein the health information collection device is electrically connected to the health information analysis circuit. The intelligent household health management device is characterized in that the health information analysis circuit comprises a bioelectricity detection module and a body impedance detection module, the health information collection device comprises a collection electrode and a signal switchover switch, the collection electrode is connected with the bioelectricity detection module and the body impedance detection module through the signal switchover switch, the signal switchover switch comprises a shell, a mobile contact, a static contact and an electromagnetic push rod, the mobile contact is installed on a movable rod of the electromagnetic push rod, and an electromagnet of the electromagnetic push rod is far away from the mobile contact and the static contact. The intelligent household health management device has the advantage of high detection precision.

The invention discloses a touch display panel, a driving method and a touch display device. The touch display panel comprises a shift circuit, a control signal line, a control circuit, multiple scanning lines, multiple data lines, multiple touch driving electrodes, a switching control signal end and a switching control switch unit. During a touch period of a frame cycle, all switching control switches are switched on under the control of a first control signal output by the switching control signal end, so that all the touch driving electrodes are electrically connected with at least one data line through at least one switching control switch; the control circuit enables the scanning lines to be suspended based on the first control signal output by the switching control signal end and a signal at the output end of the shift circuit. Through the touch display panel, coupling between devices on the touch display panel is lowered, stray capacitance between the scanning lines and other devices is eliminated, and the signal detection precision of the touch display panel is improved.

The invention discloses an amplitude equalization circuit for a mobile underwater sound frequency-hopping communication receiving system, and relates to a frequency-hopping communication system. The circuit is provided with an impedance transformation circuit, an automatic gain control circuit, and a bandpass filter. The input end of the impedance transformation circuit is externally connected with an energy converter, and the automatic gain control circuit is provided with a primary amplification circuit, a secondary amplification circuit, and a feedback control circuit. The input end of the primary amplification circuit is connected with the output end of the impedance transformation circuit, and the output end of the secondary amplification circuit is connected with the input end of the bandpass filter. The output end of the bandpass filter is connected with the input end of the secondary amplification circuit, and the output end of the secondary amplification circuit is connected with the input end of the feedback control circuit. A control signal output end of the feedback control circuit is connected with the primary amplification circuit, and the output end of the secondary amplification circuit is externally connected with a subsequent circuit. The circuit can effectively reduce the size of the range of an amplitude change, caused by frequency change, of an echo signal of a receiving end, reduces the operation amount of a system, and improves the detection accuracy.

The invention discloses an ion chromatography digital conductance detecting device based on a digital signal processor (DSP). The ion chromatography digital conductance detecting device comprises a digital conductance detector circuit board and a conductance detecting pond. Traditional thought of the ion chromatography digital conductance detecting device is abandoned from a measuring circuit and signal processing, digital programmable sine alternating current exciting signals are generated through the DSP and exerted on a conductance sensor, and electrode voltage and current are detected through I/V current detecting based on a microcurrent operational amplifier and a differential voltage detecting method with buffering input. By means of direct alternating current synchronous sampling, conductance signals are extracted out through a digital sine phase sensibility demodulation method through the DSP. In addition, real-time conductance rate of a solution can be output after temperature compensation. The ion chromatography digital conductance detecting device effectively improves flexibility and precision of ion chromatography conductance detecting, increases detecting range of the ion chromatography digital conductance detecting device, and reduces system noise and baseline drift.

The invention provides a differential MEMS gas sensor. The sensor is internally provided with two chamber groups with cavity space in mirror symmetry and arranged on the same layer, and each chamber group comprises a gas chamber cavity and a sound chamber cavity which are communicated with each other in an intersecting manner; a microphone for detecting sound signals is arranged in each sound chamber cavity; each chamber group is communicated with the atmosphere outside the differential MEMS gas sensor only through a plurality of air holes formed in the top chamber wall of the gas chamber cavity; and the gas chamber cavity of one chamber group is further provided with a laser assembly, and laser generated by the laser assembly can be shot into the gas chamber cavity. A double-gas-chamber differential design is adopted, the influence of environmental noise on measurement is greatly reduced, the precision is high, and the size is small.

The invention discloses an electromagnetic spectrum monitoring receiver signal automatic detection method, which comprises the steps of signal enhancement representation and ensemble learning discrimination, wherein the signal enhancement representation is used for solving a local mean difference, a local median difference and a local morphological processing difference of a spectrum of each signal under different scales, and then an enhanced representation matrix is formed; and the integrated learning discrimination comprises branch detector learning and integrated detector learning, and is implemented by forming a signal detection training sample set by using the enhanced representation matrix of a plurality of signals at first, allocating sample subsets to train branch detectors and recording a detection result, then constructing an ensemble learning training sample set by using a detection result and training an ensemble detector, and after training of the integrated detector is completed, the branch detectors and the ensemble detector are combined, and the ensemble detector outputs a final automatic signal detection result. The electromagnetic spectrum monitoring receiver signal automatic detection method has relatively high signal characterization capability and signal identification capability, so that good signal detection accuracy and stability can be realized.

In a foreign matter inspection apparatus for a semiconductor wafer, a PMT which detects reflection light, an amplifier which amplifies a signal detected by the PMT and in which response characteristics of amplification are controlled by a control signal, an A/D converter which converts the signal amplified by the amplifier into a predetermined code and outputs the code, a control circuit which generates a control signal based on information of the semiconductor wafer having a correlation with the reflection light, and a data processing circuit which detects a foreign matter on the semiconductor wafer based on the code output from the A/D converter are provided.

The invention discloses an angle-based adjusting device, a sensor module and a cleaning robot. The adjusting device is used for adjusting the detection angles of sensors to be assembled, and comprisesa bottom shell inside which demising slots are formed and adjusting mechanisms, wherein demising openings for supporting the movement of the sensors to be assembled are reserved in the demising slotsof the bottom shell; the side faces of the bottom shell are provided with the adjusting mechanisms used for being pressed against the sensors to be assembled; the adjusting mechanisms enter and exitfrom the side faces of the bottom shell in an adjustable way, so that the detection angles of the sensors to be assembled change along with the changes of the distances of the adjusting mechanisms entering and exiting from the bottom shell; and the sensors to be assembled are clamped between the adjusting mechanisms and the demising slots. Through adoption of the angle-based adjusting device, thedefect that the adjustment for the signal detection angles of the sensors is constrained in the prior art can be overcome; the optimal detection angles of the sensors can be adjusted more stably through manual control of the adjusting mechanisms under a corresponding scene; and the signal detection accuracy under a current scene is improved.

The invention relates to a strong magnetic interference resistant non-magnetic rotation signal acquisition device, which comprises a PCB (printed circuit board) circuit board and a semicircular steelplate. An external inductance coil, a timer and a voltage comparator are integrated on the PCB circuit board, and four groups of inductance coils are uniformly distributed on the inner periphery of the external inductance coil, and the semicircular steel plate rotates to shield any two adjacent inductance coils in the four groups of the inductance coils to generate changing current signals. Outputends of the four groups of coils are connected with a signal processing circuit, the timer in the signal processing circuit is used for calculating a voltage comparison value changing period of the voltage comparator, and signal output ends of the voltage comparison and the timer are both connected to an external terminal through TTL output interfaces. The strong magnetic interference resistant non-magnetic rotation signal acquisition device is internally free of magnetic components such as permanent magnets and low in internal and external magnetic force influences, measuring of rotation numbers and rotation speed and judgment of rotation directions can be realized according to an LC oscillating principle, and accuracy in measurement is achieved.

The invention discloses a dynamic pressure intelligent air bearing which comprises a bearing left end cover, a bearing sleeve, a bearing right end cover, piezoelectric ceramics (PZT), a pressure sensor, a vibration sensor, a temperature sensor, a sensor protection layer, a three-stage amplification mechanism, a retainer and a top foil. A pressure sensor and a vibration sensor are placed in a sensor protection layer at the bottom end of a three-stage amplification mechanism, a temperature sensor is placed on the back face of top foil, PZT is placed in symmetrical lever arm through grooves, the top foil is made of elastic materials and covers the three-stage amplification mechanism, and the three-stage amplification mechanism is fixed to a bearing sleeve through a retainer, a bearing left end cover and a bearing right end cover by bolts. A power supply signal coupling lever mechanism of a PZT is controlled through a sensor signal to amplify PZT deformation, a top foil is supported through a three-stage amplification mechanism, direct contact between a sensor and a rotating part is avoided, gas film pressure and vibration signals generated when an air bearing works are measured through the three-stage amplification mechanism, the measurement precision is improved, and the bearing characteristics are intelligently controlled.

The present invention realizes reduction of position information demodulation errors caused by the eccentricity of the magnetic disk and improvement of position signal detection accuracy, as well as enabling quick eccentricity clock correction for arbitrary clock frequencies. An inspection device in accordance with the present invention comprises: a servo demodulation unit which demodulates servo information; a PLL clock generating unit which generates a reference clock and supplies the reference clock to the servo demodulation unit; and a tester control unit. The PLL clock generating unit includes an eccentricity correction circuit for correcting the frequency of the reference clock depending on the eccentricity of the magnetic disk. The tester control unit generates correction data for correcting the frequency of the reference clock, multiplies the correction data by the inverse of a transfer function of the PLL clock generating unit, and supplies the product to the eccentricity correction circuit.

This invention improves the accuracy of wobble signal detection for disc discrimination and reduces discrimination errors due to noise. In an optical disc apparatus, a wobble signal generator creates a wobble signal from an electrical signal which has been obtained from conversion by a pickup. A bandpass filter (BPF) is set to change its central frequency to a wobble frequency f0 and to fn different from the wobble frequency, and the filter extracts the respective frequency components from the wobble signal. An amplitude-measuring section measures amplitude levels A0 and An of the extracted multiple signals. A disc discriminator compares the multiple amplitude levels and if the amplitude A0 is greater than the amplitude An by at least a threshold level Ath, judges that a wobble is present.

There is provided a signal detection circuit capable of detecting a signal at a high speed having small amplitude, and a data transfer control device and electronic equipment using the same. The signal detection circuit includes a peak hold circuit, a constant potential setting circuit, and a comparison circuit. The peak hold circuit holds a peak value of an input signal at a given node. The constant potential setting circuit always returns the potential at the given node changed by holding the peak value by the peak hold circuit to a constant potential at a time constant greater than the potential change caused by holding the peak value. The comparison circuit compares the potential at the node at which the peak value is held and which is slowly returned to the constant potential with a given reference level, and outputs the comparison result as a detection signal.