36 results about "Capacitive microphone" patented technology

The invention relates to the technical field of noise measurement systems, in particular to a noise measurement system for a new energy tire, which comprises a tire positioning and driving unit, a sensor unit, a data acquisition and synchronization unit, a data processing unit, a data analysis unit and a man-machine interaction and display unit, the tire positioning and driving unit simulates different loads, different speeds and different road conditions of a tire by using a rack type tire positioning device, and drives the tire to rotate by using a brushless mute motor, so that a high-speed rotating effect without introducing extra mechanical noise is realized; the sensor unit is arranged on the two sides of the tire and at the position close to the ground through an acoustic sensor free field type condenser microphone array, is fixed to the suspension support through an acceleration sensor and is used for collecting vibration signals; the running states of the tire under different loads, speeds and road conditions are accurately simulated, noise data of the tire under various actual working conditions are obtained, and the measurement result is closer to the real situation.

The invention discloses an inter-floor noise active suppression system and method.The system comprises a noise monitoring module, a signal processing module, a sound wave emission module and an intelligent control module, and the noise monitoring module, the sound wave emission module and the intelligent control module are all electrically connected with the signal processing module; the noise monitoring module comprises a broadband condenser microphone array, a vibration acceleration sensor and a beam forming processor. Through combination of acoustic monitoring, signal processing and sound wave emission technologies, upstairs noise can be monitored in real time, reverse sound waves with opposite phases and equal amplitudes are generated, so that the noise is effectively counteracted, and through combination of the multi-mode acoustic sensor array and a reverse sound wave noise reduction algorithm, real-time monitoring and quick response to floor noise are realized, and the noise reduction efficiency is improved. The real-time performance and accuracy of the noise reduction effect are ensured, and a quiet living and working environment is created for residents and office staff.

The utility model relates to the technical field of telecommunication, and particularly discloses an anti-howling microphone, which comprises a capacitance microphone core, a sound pickup hole is arranged on the top surface of the capacitance microphone core, and an air hole is arranged on the bottom surface of the capacitance microphone core; the microphone core bracket comprises a microphone core fixing part used for installing the capacitance microphone core and a sound wave diffusion part located under the capacitance microphone core; wherein the sound wave diffusion part is of a conical structure which is gradually narrowed towards the capacitance microphone core. The anti-howling microphone provided by the utility model can effectively solve the problem that howling is easily caused when a capacitive microphone core is used for pickup.

The present disclosure provides a capacitive microphone (100, 800, 1000) comprising a diaphragm (120) and a backplate (130). The diaphragm (120) is provided with a first hole array (121) that allows airflow to pass through, and the backplate (130) is provided with a second hole array (131) that allows airflow to pass through. The diaphragm (120) and the backplate (130) are spaced apart from each other to form a capacitor.

The present invention relates to an anti-leakage electronic cigarette heating wire drive control circuit, method, chip and electronic cigarette, which are applied to an electronic cigarette using a capacitive microphone, and include a smoking detection circuit for detecting the capacitance value of the capacitive microphone in a smoking state; and also include an oil leakage protection circuit; the input end of the oil leakage protection circuit is connected to the output end of the capacitive microphone, and the output end is connected to the heating wire drive circuit of the electronic cigarette, and is used to detect the capacitance value of the capacitive microphone, and convert the capacitance value of the capacitive microphone into a first comparison signal; when the capacitance value of the capacitive microphone reaches a set oil leakage threshold, the heating wire drive circuit is controlled to be turned off to achieve the oil leakage protection function; the heating wire drive circuit is automatically detected and controlled to be turned off to achieve the oil leakage protection function, so as to prevent the electronic cigarette from being powered on and causing oil explosion in the case of oil leakage, so that the user can know the oil leakage of the electronic cigarette, and prevent the user from being scalded, thereby reducing the safety hazards of the electronic cigarette.

The invention relates to idle tone mitigation using clock jitter. A circuit includes a capacitive micro-electromechanical system (MEMS) microphone configured to generate a voltage signal in response to a sound signal; a voltage controlled oscillator (VCO) coupled to the capacitive MEMS microphone, where the VCO is configured to generate a frequency modulated signal having a frequency proportional to the voltage signal; a frequency-to-digital (FTD) converter coupled to an output terminal of the VCO; a random number generator configured to generate a random number; and a phase modulator configured to generate a phase modulated clock signal by sampling a phase of the clock signal according to a random number modulation system, where the FTD converter is configured to generate a digital signal according to the frequency modulated signal and the phase modulated clock signal, and configured to sample the digital signal by the phase modulated clock signal to generate a digital output signal of the FTD converter.

The invention provides a condenser microphone, a semiconductor device and a manufacturing method thereof, which are applied to the technical field of semiconductors. According to the invention, the trench isolation structure is arranged in the substrate under the diaphragm structure, so that a high-insulation resistor is additionally arranged at the weakest part of the substrate under the diaphragm structure, and a leakage current path possibly generated between the diaphragm structure and the substrate is avoided by utilizing physical isolation; the leakage resistance between the vibrating diaphragm structure and the substrate is further increased, the parasitic capacitance between the vibrating diaphragm structure and the substrate is reduced, and the problems that the leakage resistance between the vibrating diaphragm structure and the substrate is reduced and the signal-to-noise ratio is reduced due to the loss of the isolating layer caused by the fillet first opening formed in the first sacrificial layer are solved.

The invention discloses a resonant piezoelectric MEMS microphone with a high signal-to-noise ratio and application thereof, and belongs to the technical field of MEMS acoustic sensors. According to the resonant piezoelectric MEMS microphone, the suspended annular-film composite structure with the two ends symmetrically and fixedly supported is adopted, the high Young modulus film is sensitive to tiny stress change caused by sound waves, the rigid boundary is restrained through the film, vibration caused by the sound waves is more efficiently transmitted to the annular piezoelectric structure, the energy loss of the sound waves can be effectively reduced, and the reliability of the microphone is improved. And the sensitivity of the resonant microphone is obviously improved. Besides, the suspended annular-film composite structure with two ends symmetrically and fixedly supported overcomes the problems of low Q value and large energy loss of a traditional resonant microphone (such as a cantilever beam structure), so that the resonant peak is sharper, and the microphone is more sensitive to tiny resonant frequency deviation caused by sound waves. Moreover, the larger the Q value is, the smaller the noise is, and compared with a traditional capacitive microphone and a traditional piezoelectric microphone, the SNR can be greatly improved in a low-frequency band.

The application provides a condenser microphone, a semiconductor device and a manufacturing method thereof, and is applied to the technical field of semiconductors.In the application, a groove isolation structure is arranged in a substrate under a vibrating diaphragm structure, a high insulation resistance is additionally arranged at the weakest position of the substrate under the vibrating diaphragm structure, then a possible leakage current path between the vibrating diaphragm structure and the substrate is avoided by physical isolation, the leakage resistance between the vibrating diaphragm structure and the substrate is further increased, the parasitic capacitance between the vibrating diaphragm structure and the substrate is reduced, and the problems of the reduced leakage resistance between the vibrating diaphragm structure and the substrate and the reduced signal-to-noise ratio caused by the loss of the first opening with a rounded corner in the first sacrificial layer to the isolation layer are solved.

The application relates to the field of shield model testing and monitoring, and particularly discloses a slurry balance shield model testing device, which comprises a soil bin, a counterforce frame fixed to one side of the soil bin, a moving cabin capable of reciprocating sliding between the soil bin and the counterforce frame, and a multi-source sensor system. The moving cabin comprises a slurry cabin and an air cushion cabin which are independent of each other. A cutter head is arranged at the front end of the slurry cabin. A centrifugal pump is connected in series to a slurry inlet pipeline and a slurry discharge pipeline of the slurry cabin. The multi-source sensor system comprises a torque sensor connected to the cutter head, a pressure sensor connected to the slurry cabin, a pump body acceleration sensor connected to the centrifugal pump, and a condenser microphone arranged in the soil bin and facing a tunneling face. The device can simulate the coupling process of shield tunneling and slurry circulation under laboratory conditions in a high simulation mode, and can realize the synchronous and real-time collection of key multi-source physical parameters of cabin pressure, cutter head load, pumping vibration and tunneling face acoustic signals, thereby providing technical support for in-depth research on the evolution mechanism of complex working conditions such as slurry balance shield lagging.

This invention discloses a MEMS capacitive microphone, comprising a substrate, a support, and a diaphragm, wherein: the diaphragm is supported above the substrate by the support, and the substrate, the support, and the diaphragm form a vacuum cavity; the side of the diaphragm near the vacuum cavity is connected to an electrostatic clutch via a connecting rod; the electrostatic clutch is connected to a capacitive sensing structure. Compared with the prior art, the advantage of this invention is that it allows the microphone to operate under a wide range of atmospheric pressures that customers may expect. This is achieved electrostatically in a purely passive manner, which is advantageous over other designs that require complex electronics and active control. Since only small AC disturbances of the rotor need to be considered, without considering DC changes in rotor position, the diaphragm and sensing structure are physically decoupled, thereby simplifying the design of the sensing structure.

The present invention relates generally to the field of electret capsule, and more particularly to a circuit configuration of an impedance converter integrated in an electret capsule such as for use in condenser microphones. The electret capsule of a microphone may include a gate biasing field effect transistor (FET) to facilitate biasing of a low noise FET. Advantageously, the use of low noise FET in the electret capsule of a microphone provides for a reduced cost, while achieving lower self-noise.

A device for receiving acoustic waves, includes an acoustic antenna able to function as a condenser microphone distributed along a line of the acoustic antenna comprising a conductor and a dielectric, the line being a transmission line or being configured to function as a transmission line when the dielectric makes direct physical contact with another conductor, an exciter configured to apply, in a receiving step, an input voltage to a first longitudinal end of the line so as to generate an input electromagnetic wave that moves toward a second longitudinal end of the line and so as to generate an output electromagnetic wave that moves in the opposite direction to the input electromagnetic wave, the input voltage simultaneously comprising a set of sinusoidal voltages comprising a fundamental sinusoidal voltage and a set of harmonics of the fundamental sinusoidal voltage, the frequency of the fundamental sinusoidal voltage being defined so that stationary waves are established in the line such that the output electromagnetic wave comprises directional acoustic-antenna channels.

The invention relates to the technical field of biomedical electronic engineering and physiological signal processing, and discloses a special MEMS sensor for heart sound, which comprises an MEMS sensor shell, a silicon substrate is fixedly connected to the inner bottom of the MEMS sensor shell, and a central acoustic unit and a peripheral inertial unit are integrated on the silicon substrate in a monolithic manner; the central acoustic unit is used for collecting sound pressure signals; the central acoustic unit is arranged in the MEMS sensor shell, the peripheral inertial unit is arranged around the central acoustic unit and is used for collecting three-axis acceleration signals, a processor is arranged in the MEMS sensor shell and is electrically connected with the central acoustic unit and the peripheral inertial unit, the central acoustic unit is of a capacitive MEMS microphone structure, and the central acoustic unit and the peripheral inertial unit are arranged in the MEMS sensor shell. The peripheral inertia unit is of a three-axis MEMS accelerometer structure. Through multi-modal signal fusion and closed-loop adaptive adjustment, the problems that traditional heart sound collection is low in signal-to-noise ratio, unstable in signal and lack of comparability are solved.

The utility model discloses an outdoor noise monitoring sensor relates to noise monitoring sensor technical field. This outdoor noise monitoring sensor, including support sleeve, terminal, connecting wire, terminal and connecting wire electric connection, the inside of support sleeve is provided with sensor mainboard and condenser microphone, sensor mainboard and connecting wire electric connection, the outer wall of support sleeve is close to the top and is provided with the sound hole, the sound hole is in the outside of support sleeve and is distributed in the circular array, the outside of support sleeve is sleeved with T type mounting disc, the outer wall of T type mounting disc is provided with screw hole, the inner wall screw thread connection of screw hole has fastening bolt. The utility model discloses through multiple structure cooperation, avoids the erosion of wind and rain, dust to internal condenser microphone, sensor mainboard, guarantees the stable collection of sound wave signal again, has improved the monitoring precision and equipment durability under the outdoor complex environment significantly.

A circuit includes: a capacitive micro-electromechanical system (MEMS) microphone configured to generate a voltage signal in response to a sound signal; a voltage-controlled oscillator (VCO) coupled to the capacitive MEMS microphone, where the VCO is configured to generate a frequency modulated signal having a frequency proportional to the voltage signal; a frequency-to-digital (FTD) converter coupled to an output terminal of the VCO; a random number generator configured to generate random numbers; and a phase modulator configured to generate a phase modulated clock signal by modulating a phase of a system sampling clock signal in accordance with the random numbers, where the FTD converter is configured to generate a digital signal in accordance with the frequency modulated signal and the phase modulated clock signal, and is configured to sample the digital signal by the phase modulated clock signal to generate a digital output signal of the FTD converter.

1. Name of the product in this design: Capacitive Microphone (Dual-Network GB40). 2. Purpose of this design: A microphone used for amplification. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention discloses a photoacoustic spectrometry gas detection device and method based on a pi-type Helmholtz photoacoustic cell, and the device comprises a distributed feedback type semiconductor laser, a laser collimator, the pi-type Helmholtz photoacoustic cell, a condenser microphone, a control and data acquisition system, and a computer. Wherein the distributed feedback type semiconductor laser outputs modulated laser, the modulated laser is collimated by the laser collimator and then enters the Pi-type Helmholtz photoacoustic cell to excite target gas to be measured in the Pi-type Helmholtz photoacoustic cell, and the target gas to be measured generates periodic pressure fluctuation after absorbing laser energy; after being conducted by a connecting pipe of the Pi-type Helmholtz photoacoustic cell, a photoacoustic signal is generated at the detection cavity, the photoacoustic signal at the detection cavity is detected by using a condenser microphone, and the detected photoacoustic signal is transmitted to a control and data acquisition system and a computer for demodulation and subsequent processing. The device has the advantages of being good in resonant frequency matching performance, high in photoacoustic signal intensity and high in anti-noise capacity.

The utility model provides a microphone circuit for eliminating near speaking effect and loud sound distortion, comprising a condenser microphone which is coupled with a DC bias power supply used for providing bias voltage, the anode output and the cathode output of the condenser microphone are respectively coupled with a load resistor R2, and audio signal voltage is taken out from two ends of the load resistor R2; the drain electrode of the low-resistance field effect transistor T1 is coupled with the positive electrode output of the microphone through a resistor R1, and the source electrode of the low-resistance field effect transistor T1 is coupled with the negative electrode output of the microphone; the input end of the overload shunt circuit is coupled with the positive electrode output of the microphone and the negative electrode output of the microphone, the output end of the overload shunt circuit is coupled with the grid electrode of the low-resistance field effect transistor T1, and the overload shunt circuit is used for controlling the on-off of the low-resistance field effect transistor T1 based on the output voltage of the microphone; when the output voltage of the microphone exceeds a preset threshold value due to the rising of a near speaking effect or strong noise, the overload shunt circuit outputs voltage / current to open the low-resistance field effect transistor T1, and the loop impedance of the microphone output circuit is smaller than the internal resistance of the direct current bias power supply, so that the bias voltage drops, the gain of the microphone drops, and the distortion is reduced.

The invention relates to the technical field of condenser microphones, in particular to a microporous waterproof condenser microphone which comprises a mounting ring, a plurality of mounting mechanisms are fixedly connected to the mounting ring, a head lamp is sleeved with the mounting ring, and a protective cover is fixedly connected to one side of the mounting ring. Two baffles are symmetrically and rotatably connected to an opening in the bottom end of the protective cover, a moving ring is arranged in the protective cover, a rotating ring is rotatably connected to the moving ring, and a condenser microphone is rotatably connected to the rotating ring. According to the capacitive microphone, the baffle can be driven to be closed while the capacitive microphone is retracted into the protective cover, so that the capacitive microphone is protected in the protective cover, meanwhile, a plurality of sound receiving micropores are formed in the sound receiving surface of the capacitive microphone, liquid can be fixed in the sound receiving micropores by utilizing the surface tension of the liquid, and the sound receiving effect of the capacitive microphone is improved. External liquid is prevented from entering the inside of the condenser microphone, and the waterproof effect can be effectively achieved.

The utility model relates to a micropore waterproof sound receiver structure and a condenser microphone, the micropore waterproof sound receiver structure comprises a housing and a sound receiving part, the end face of the top of the housing is provided with a plurality of sound receiving micropores, and the plurality of sound receiving micropores are uniformly distributed on the end face of the top of the housing close to the central position of the top of the housing; the sound receiving part is arranged in the shell; the sound receiving part comprises a vibrating diaphragm, a back electrode and a PCB, the vibrating diaphragm is arranged on the side, close to the sound receiving micropore, in the shell, the PCB is arranged at the end, away from the sound receiving micropore, of the shell, the back electrode is arranged between the PCB and the vibrating diaphragm, and the back electrode is electrically connected with the PCB; an equivalent capacitor is formed between the vibrating diaphragm and the back polar plate. According to the utility model, the sound receiving surface of the housing is provided with the plurality of sound receiving micropores, the surface tension of liquid is utilized, and the plurality of tiny sound receiving micropores play a waterproof role, so that the sound receiving effect of the sound receiving micropores is more ideal, and the distortion phenomenon is avoided.

The invention relates to the technical field of sleep monitoring, in particular to a sleep and sign state monitoring method based on a microphone sensor. According to the method, sound signals of a human body in the sleep process at night are collected through a condenser microphone sensor, and vital sign signals such as heart rate, breath, body movement and BCG are separated through filtering and short-time Fourier transform processing; and in combination with the sleep stage labels, a deep learning algorithm is utilized to train and establish a sleep stage classifier, and automatic identification of different sleep stages is realized. According to the method, the heart rate, the respiration rate and the body movement data can be calculated at the same time in the actual monitoring process, the classification result and the physical sign data are fused, and the sleep staging state of the whole night and the overall sleep condition are obtained. Compared with the prior art, the method has the advantages of non-contact acquisition, high comfort, low cost, comprehensive monitoring indexes and the like, and is suitable for family long-term sleep health monitoring.

The present disclosure provides a capacitive microphone (100, 800, 1000) comprising a diaphragm (120) and a backplate (130). The diaphragm (120) is provided with a first hole array (121) that allows airflow to pass through, and the backplate (130) is provided with a second hole array (131) that allows airflow to pass through. The diaphragm (120) and the backplate (130) are spaced apart from each other to form a capacitor.

This invention relates to the field of acoustic-to-electrical conversion technology, and provides a capacitive MEMS microphone and its manufacturing method. The capacitive MEMS microphone includes a substrate, a diaphragm, a suspension bracket, and a backplate. The backplate is disposed on the substrate; the suspension bracket is disposed on the side of the backplate away from the substrate; the edge of the diaphragm is suspended on the side of the suspension bracket facing the backplate; wherein, a first gap is provided between the upper surface of the diaphragm and the lower surface of the suspension bracket, and a second gap is provided between the lower surface of the diaphragm and the upper surface of the backplate. This capacitive MEMS microphone reduces the stress at the connection point between the diaphragm and the suspension bracket, prevents the diaphragm from cracking due to excessive deformation, and makes the microphone more stable, effectively improving the performance of the MEMS microphone.

The application relates to a capacitive MEMS microphone structure and a manufacturing method thereof, which comprises a substrate, a diaphragm located above the substrate, a back plate located above the diaphragm, the back plate comprising an electrode area and a non-electrode area, a support located between the substrate and the back plate, used for supporting the diaphragm and the back plate, and an air gap located between the diaphragm, the back plate and the support; wherein the capacitive MEMS microphone structure further comprises a reinforcing frame for reinforcing the mechanical strength of the back plate, which is arranged on the surface of the back plate in the non-electrode area. The capacitive MEMS microphone structure of the application is provided with the reinforcing frame, which can improve the mechanical strength of the back plate, avoid crack damage caused by excessive local stress concentration, and help improve the performance and reliability of the capacitive MEMS microphone.

This invention relates to the field of condenser microphone technology, and more particularly to a micro-perforated waterproof condenser microphone. It includes a mounting ring with multiple mounting mechanisms fixedly connected to it. A headlamp is fitted inside the mounting ring. A protective cover is fixedly connected to one side of the mounting ring. Two baffles are symmetrically connected and rotatably mounted at the bottom opening of the protective cover. A movable ring is located inside the protective cover, and a rotating ring is rotatably connected to the movable ring. The condenser microphone is rotatably connected to the rotating ring. By using the protective cover and baffles, when the condenser microphone is not in use, it can be retracted into the protective cover, which in turn closes the baffles, thus protecting the microphone. Furthermore, by having several micro-perforations on the microphone's receiving surface, liquid surface tension can be used to fix the liquid within these micro-perforations, preventing external liquid from entering the microphone and effectively providing waterproofing.

An electromagnetic microphone, comprising a circuit board, a housing which is in covered connection with the circuit board so as to enclose an accommodating space, and a sound sensor, wherein a sound hole in communication with the accommodating space penetrates one of the circuit board and the housing, and the sound sensor comprises: a substrate, which is provided in the accommodating space and is fixed to the circuit board, the substrate being provided with a cavity; a vibration member, which is fixedly arranged on the side of the substrate away from the circuit board and covers the cavity, external sound waves acting on the vibration member via the sound hole, the vibration member comprising a diaphragm fixed to the substrate and a magnetic element having a magnetic field, and the magnetic element being fixed to the diaphragm; and a coil, and when the vibration member vibrates, the coil cuts the magnetic field of the magnetic element to generate an electrical signal. Compared with a traditional capacitive microphone, the electromagnetic microphone of the present invention does not have a back plate structure, such that not only can damping and noise be greatly reduced, but the problem of damage to a membrane due to same being suctioned can also be avoided, thereby improving the reliability of the electromagnetic microphone.

The invention discloses a circular capacitive MEMS microphone packaging structure and process, and belongs to the technical field of semiconductor packaging. The structure comprises a PCB substrate adopting a circular design, and the substrate is provided with a through hole so as to form a front cavity with a self-contained cavity of an MEMS capacitive chip; the ASIC integrated chip and the MEMS capacitive chip are mounted on the substrate and are electrically connected with each other; the circular shell covers the periphery of the substrate, and a circular expansion back cavity surrounding the double chips is formed in the circular shell. The process comprises the steps of substrate dispensing and chip mounting, baking and curing, gold wire bridging, COB glue dispensing and coating, tin drawing, shell reflow soldering and curing and the like. According to the invention, through the cooperation of the circular substrate and the housing, the space of the back cavity is increased, and the SNR signal-to-noise ratio performance is effectively optimized; meanwhile, according to the packaging structure, the harsh requirement for the height of chip glue is lowered, the technological process is simplified, the operation cost is lowered, and product miniaturization and performance optimization are facilitated.

The application relates to a differential capacitive MEMS microphone and a manufacturing method thereof, the microphone comprising: a substrate comprising a second back plate; a first support layer arranged on the substrate; a diaphragm arranged on the first support layer; a second support layer arranged on the diaphragm; and a first back plate arranged on the second support layer, the diaphragm being located between the first back plate and the second back plate; wherein the diaphragm and the first back plate form a first capacitor for outputting a first capacitance value signal, the diaphragm and the second back plate form a second capacitor for outputting a second capacitance value signal, and the first capacitance value signal and the second capacitance value signal constitute a differential signal. The application uses a part of the structure of the substrate as the second back plate, so that the second back plate itself does not increase the thickness of the microphone. Moreover, the capacitive signals output by the capacitors formed by the diaphragm and the first back plate and the second back plate constitute a differential signal, so that the signal-to-noise ratio of the microphone can be improved.

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a hydrogen-rich carbon circulating oxygen blast furnace tuyere oxygen supply matching device based on audio frequency measurement and an adjusting method.The device comprises a blast furnace body, an optical transmitter, an optical receiver and a central control room host, the blast furnace body is communicated with a tuyere small sleeve, and the tuyere small sleeve is provided with a hot gas pipe and an oxygen pipe; the oxygen pipe is provided with an electromagnetic flowmeter and an electric control adjusting valve, a hot gas pipe flange is connected with a hot gas branch pipe, a condenser microphone is arranged at the flange connecting position, the condenser microphone and the electromagnetic flowmeter are electrically connected with a light transmitter, the light transmitter is electrically connected with a light receiver, and the light receiver is electrically connected with a PLC. And the central control room host and the electric control adjusting valve are electrically connected with the PLC. The problem that the oxygen supply amount corresponding to the hot gas injection amount of the tuyere small sleeve cannot be accurately controlled is solved. According to the invention, the audio signal of the hot gas is monitored through the condenser microphone, and the oxygen supply amount corresponding to the hot gas is obtained by combining the calculation of the central control room host, so that the oxygen supply amount is accurately controlled.