Abstract: The present disclosure provides an inductive magnetic sensor, which includes a signal pre-amplifying measurement circuit, a feedback loop, a magnetic core and coil group, a low-noise autozero processing circuit, and an output protection module. The magnetic core and coil group is electrically connected between the signal pre-amplifying measurement circuit and the feedback loop, the signal pre-amplifying measurement circuit comprises the low-noise autozero processing circuit, and the feedback loop and the low-noise autozero processing circuit are electrically connected to the output protection module respectively. By introducing the resonant notch filter, it may extend the passband to the low frequency, and extend the low-frequency characteristic of the magnetic sensor, to obtain a better low-frequency magnetic sensor. The present disclosure further provides an electromagnetic prospecting equipment.

Abstract: A semi-airborne electromagnetic survey device and a semi-airborne electromagnetic survey method based on coaxial coplanar mutual reference coil assembly are provided. The device includes a measuring coil and a reference coil with linear correlation of additive motion noise; the reference coil and the measuring coil have a same bandwidth, are coaxial and coplanar and are in hard connection or soft connection; detection resolution of the reference coil only distinguishes the additive motion noise; detection resolution of the measuring coil distinguishes real vertical magnetic field signals and motion noise simultaneously; the reference coil has a much smaller outer diameter than the measuring coil. In the method, one coil only receives the additive motion noise, and an other coil simultaneously receives the additive motion noise and the real vertical magnetic field signals; and the additive motion noise received by the two coils is cancelled to obtain the real vertical magnetic field signals.

Abstract: An all-band magnetic sensor is provided. The all-band magnetic sensor comprises an induction coil, a voltage measurement module, and an integrator; the induction coil is used for generating an induced electromotive force according to magnetic flux passing therethrough; an impedance transformation circuit is connected to the output end of the induction coil and used for improving the loop resistance of the induction coil; the voltage measurement module is electrically connected to the impedance transformation circuit, and used for measuring the induced electromotive force generated by the induction coil; and the integrator is electrically connected to the voltage measurement module, and used for expanding a bandwidth.

Abstract: The present disclosure provides a real-time correction method for an Oven Controlled Crystal (Xtal) Oscillator (OCXO) and an electromagnetic receiver. The real-time correction method for an OCXO includes: performing frequency multiplication on a reference clock signal to generate a first measurement signal and a second measurement signal; identifying a rising edge of each pulse per second on the basis of the first measurement signal to obtain a gate time T; obtaining a frequency of the second measurement signal according to the gate time T; and adjusting a frequency of the reference clock signal at least on the basis that an absolute value of a difference between two adjacent frequencies obtained of the second measurement signal is greater than a standard frequency difference.

Abstract: Disclosed is an ocean bottom electromagnetic acquisition station communication apparatus and method. The ocean bottom electromagnetic acquisition station communication apparatus includes: ocean bottom electromagnetic acquisition stations (1) for acquiring ocean bottom electromagnetic information; a control terminal (2) for sending control signals; and a relay timing module (3) connected to the ocean bottom electromagnetic acquisition stations (1) and the control terminal (2) and used for processing the ocean bottom electromagnetic acquisition stations (1) on the basis of the control signals before placement.

Abstract: The present disclosure provides a real-time correction method for an Oven Controlled Crystal (Xtal) Oscillator (OCXO) and an electromagnetic receiver. The real-time correction method for an OCXO includes: performing frequency multiplication on a reference clock signal to generate a first measurement signal and a second measurement signal; identifying a rising edge of each pulse per second on the basis of the first measurement signal to obtain a gate time T; obtaining a frequency of the second measurement signal according to the gate time T; and adjusting a frequency of the reference clock signal at least on the basis that an absolute value of a difference between two adjacent frequencies obtained of the second measurement signal is greater than a standard frequency difference.

Abstract: A voice control method and apparatus, a chip, earphones, and a system. The method includes: recognizing (001) whether a voice signal includes a keyword; in response to the voice signal including the keyword, executing (001a) an instruction corresponding to the keyword or sending the instruction; before recognizing whether the voice signal includes the keyword, determining (002) whether the voice signal is from a target user and, in response to the voice signal being from the target user, starting to recognize (001) whether the voice signal includes the keyword; or during recognizing whether the voice signal includes the keyword, determining (002) whether the voice signal is from the target user and, in response to the voice signal being from a non-target user, stopping recognizing (003a) whether the voice signal includes the keyword. The voice control method reduces the power consumption of voice control and improves the endurance.

Abstract: Disclosed is an ocean bottom electromagnetic acquisition station communication apparatus and method. The ocean bottom electromagnetic acquisition station communication apparatus includes: ocean bottom electromagnetic acquisition stations (1) for acquiring ocean bottom electromagnetic information; a control terminal (2) for sending control signals; and a relay timing module (3) connected to the ocean bottom electromagnetic acquisition stations (1) and the control terminal (2) and used for processing the ocean bottom electromagnetic acquisition stations (1) on the basis of the control signals before placement.

Abstract: The present invention discloses a method and apparatus for simulating and designing structural parameters of an air-core coil. The method for simulating and designing structural parameters of the air-core coil includes: building an impedance function of the air-core coil according to a structural parameter variable, the air-core coil being of a differential structure and being wound in a completely parallel winding fashion; building an index function of the air-core coil by calculating an equivalent bandwidth, sensitivity and an equivalent noise power spectrum by means of the impedance function. The method is intuitive, and makes calculation of the optimized technological and structural parameters easier and more convenient, thus reducing the amount of calculation and shortening the calculation time.

Abstract: The present disclosure relates to intelligent wearable devices, and provides a method and a module for detecting a wearing state, and a wearable device thereof. The method for detecting a wearing state is applied to the wearable device, and the wearable device includes a light emitter and a light receiver. The detection method includes: controlling the light emitter to emit at least two types of light signals to a user; controlling the light receiver to receive reflected light corresponding to the at least two types of light signals reflected by the user; and determining the wearing state of the wearable device according to change trends of at least two types of the received reflected light. The wearing state of the wearable device is determined more accurately by adopting embodiments of the present disclosure.

Abstract: A biological feature detection apparatus and an electronic device are provided. The apparatus includes a light emitting unit and a light receiving unit. The light emitting unit is configured to emit light to a detection surface of a biological tissue, the light emitted by the light emitting unit is processed by the biological tissue and then transmitted to the light receiving unit, and the light receiving unit is configured to receive the light and perform a photoelectric conversion to generate an original electrical signal for biological feature detection; the light emitting unit and the light receiving unit are attached to the detection surface of the biological tissue. As such, the signal-to-noise ratio of the original electrical signal is improved and accuracy of biological feature detection is enhanced.

Abstract: An all-band magnetic sensor is provided. The all-band magnetic sensor comprises an induction coil, a voltage measurement module, and an integrator; the induction coil is used for generating an induced electromotive force according to magnetic flux passing therethrough; an impedance transformation circuit is connected to the output end of the induction coil and used for improving the loop resistance of the induction coil; the voltage measurement module is electrically connected to the impedance transformation circuit, and used for measuring the induced electromotive force generated by the induction coil; and the integrator is electrically connected to the voltage measurement module, and used for expanding a bandwidth.

Abstract: The present disclosure provides an inductive magnetic sensor, which includes a signal pre-amplifying measurement circuit, a feedback loop, a magnetic core and coil group, a low-noise autozero processing circuit, and an output protection module. The magnetic core and coil group is electrically connected between the signal pre-amplifying measurement circuit and the feedback loop, the signal pre-amplifying measurement circuit comprises the low-noise autozero processing circuit, and the feedback loop and the low-noise autozero processing circuit are electrically connected to the output protection module respectively. By introducing the resonant notch filter, it may extend the passband to the low frequency, and extend the low-frequency characteristic of the magnetic sensor, to obtain a better low-frequency magnetic sensor. The present disclosure further provides an electromagnetic prospecting equipment.

Abstract: The present disclosure relates to intelligent wearable devices, and provides a method and a module for detecting a wearing state, and a wearable device thereof. The method for detecting a wearing state is applied to the wearable device, and the wearable device includes a light emitter and a light receiver. The detection method includes: controlling the light emitter to emit at least two types of light signals to a user; controlling the light receiver to receive reflected light corresponding to the at least two types of light signals reflected by the user; and determining the wearing state of the wearable device according to change trends of at least two types of the received reflected light. The wearing state of the wearable device is determined more accurately by adopting embodiments of the present disclosure.

Abstract: A biological feature detection apparatus and an electronic device are provided. The apparatus includes a light emitting unit and a light receiving unit. The light emitting unit is configured to emit light to a detection surface of a biological tissue, the light emitted by the light emitting unit is processed by the biological tissue and then transmitted to the light receiving unit, and the light receiving unit is configured to receive the light and perform a photoelectric conversion to generate an original electrical signal for biological feature detection; the light emitting unit and the light receiving unit are attached to the detection surface of the biological tissue. As such, the signal-to-noise ratio of the original electrical signal is improved and accuracy of biological feature detection is enhanced.

Abstract: A tower heat pump system equipped with a solar energy secondary heat source comprises a cold-heat source tower, a low heat source rotational flow heat pump, a condensate water separator, a supplementary device and a rear end loading system. The tower heating pump system can achieves negative pressure evaporation, cooling and refrigeration in a high-temperature high-humidity condition and efficiently absorb and improve low-temperature-level heat energy from the solar energy secondary heat source in a low-temperature low-humidity condition.

Abstract: A heat pump for a heat source tower using secondary solar energy, including a cold and heat source tower, a low heat source heat pump, a condensation water separate device used in winter, a looping system at a cold and heat source side, and a circulating system at a terminal load side.