27 results about "Electret microphone" patented technology

The utility model relates to the technical field of microphone rods, in particular to an extremely simple circuit, which comprises a voltage microphone V-MIC2, an electret microphone MIC2, a microphone negative terminal MIC1-N, an audio signal port GPIO-12 and an external microphone rod. Wherein the output pin of the voltage microphone V-MIC2 is connected with a resistor R26, the other end of the resistor R26 is connected with a resistor R27, and the other end of the resistor R27 is connected with the output end of the electret microphone MIC2. Through the arrangement of the circuit, the circuit has the advantages of smaller size of an electronic wire, simpler circuit, short-circuit protection function and lower cost, and solves the problems that a 2PIN is used as a microphone working channel, a 1PIN is additionally used for detecting insertion and extraction, and a 1PIN is additionally used for detecting a key, so that the size of a connector is larger, the size of an earphone becomes larger, and the cost is reduced. In the prior art, the number of the electronic wires is changed from two to four, and the electronic wires become thicker, so that the open type Bluetooth telephone traffic earphone cannot realize microphone rod detection and stable conversation effect in a narrow contact area.

The utility model discloses a noise reduction electret microphone device for generator detection, which comprises an electret microphone, the positive electrode of the electret microphone is connected with one terminal of a first resistor, and the other terminal of the first resistor is used for being connected with the positive electrode of a power supply; the negative electrode of the electret microphone is connected with one terminal of the first capacitor, and the other terminal of the first capacitor is connected with the non-inverting input end of the operational amplifier; the inverting input end of the operational amplifier is connected with one terminal of the second resistor, and the other terminal of the second resistor is connected with the GND; the output end of the operational amplifier is connected with the positive electrode of the second capacitor, and the negative electrode of the second capacitor is connected with GND; the signal end of the signal output plug is connected to the positive electrode of the second capacitor, and the sleeve end is connected to the GND. The device can overcome the noise interference in the production environment of the generator set through the improved electroacoustic equipment, thereby remarkably improving the signal acquisition capability in the high-noise environment.

The utility model relates to an anti-interference electret microphone working circuit and an electret microphone. In the anti-interference electret microphone working circuit, a source electrode of a field-effect tube is connected with one end of a second resistor and one end of a third capacitor, a grid electrode of the field-effect tube is connected with one end of the third resistor, and a drain electrode of the field-effect tube is connected with one end of a fourth resistor and one end of a fifth resistor. The other end of the third resistor is connected with the positive end of the electret capacitor, the other end of the second resistor is connected with one end of the first resistor, one end of the first capacitor and one end of the second capacitor, and the other end of the first capacitor and the other end of the first resistor are connected with the positive terminal. And the negative electrode end of the electret capacitor, the other end of the fifth resistor, the other end of the fourth resistor, the other end of the second capacitor and the other end of the third capacitor are respectively grounded through a negative terminal. The anti-interference electret microphone working circuit provided by the utility model has good anti-interference capability through reasonable design.

The application provides a production equipment of a barking-preventing device lower cover assembly and a use method thereof, which comprises a rack, further comprises a conveying device arranged on the rack and used for carrying the barking-preventing device lower cover with an electret microphone mounted and an inner surface placed downward, conveying the barking-preventing device lower cover along a predetermined track to a predetermined position after the barking-preventing device lower cover is carried, a moving device arranged on the rack and used for moving the barking-preventing device lower cover to the predetermined position after the barking-preventing device lower cover is conveyed along the predetermined track to the predetermined position by the conveying device and keeping the inner surface of the barking-preventing device lower cover placed downward after the barking-preventing device lower cover is moved to the predetermined position, and a first rotating disc rotatably arranged on the rack and used for carrying the barking-preventing device lower cover and periodically rotating by a predetermined angle after the barking-preventing device lower cover is moved to the predetermined position by the moving device. The installation intensity of workers is greatly reduced, and the production efficiency of the barking-preventing device lower cover assembly is greatly improved.

This utility model discloses a voice-controlled remote control circuit for a CD player, including a power module, an input module, a voice recognition module, a control module, a storage module, a wireless transmission module, an indicator module, and a software upgrade module. The power module provides a stable voltage; the input module includes a button dome and an electret microphone, receiving manual and voice commands respectively; the voice recognition module recognizes voice commands offline; the control module processes commands and transmits them to the wireless transmission module; the wireless transmission module transmits control signals to the CD player, which is equipped with a receiving module; the indicator module displays the operating status; the storage module stores relevant data; and the software upgrade module supports system upgrades. This circuit achieves dual control via voice and buttons, improving ease of operation, eliminating the need for a network, offering high stability, and facilitating upgrades.

The application belongs to the technical field of microphones and relates to a back plate film coating device and a film coating method for an electret microphone. The back plate film coating device comprises a film tension ring for continuously fixing an electret film with a certain tension; a back plate jig located below the film tension ring for mounting a back plate; a lifting platform located below the back plate jig for carrying the back plate jig and controlling the lifting of the back plate jig, and the maximum height that the back plate jig can reach is higher than the plane where the electret film fixed by the film tension ring is located; and a hot pressing component located above the film tension ring for implementing hot pressing to coat the electret film on the back plate. The application fixes the electret film through the film tension ring, continuously fixes the electret film with a certain tension, guarantees the film coating tension, and reduces the adverse effects of high-temperature hot pressing on the film coating effect.

The utility model discloses a voiceprint acquisition device based on a linear array. The voiceprint acquisition device comprises a linear array acquisition unit, a main control processing unit and a power supply module. The linear array acquisition unit is composed of a linear array composed of four electret microphones, and each microphone corresponds to one in-phase proportional amplifier and a filter circuit and is used for performing gain amplification and high-frequency interference suppression on weak sound signals. And output signals of each channel are input to a high-speed analog-to-digital conversion chip AD7606, so that multi-channel synchronous acquisition is realized. The master control processing unit is composed of a master control chip and a peripheral circuit thereof, receives and processes the digital signals after analog-to-digital conversion, and supports subsequent identification or transmission. The power supply module adopts external 5V power supply and is provided with a digital-analog isolation circuit; according to the device, the sampling rate of 10kHZ, the 16-bit resolution, the frequency response range of 50-20000HZ and the signal-to-noise ratio of 58dB can be realized. The method is used for high-fidelity synchronous acquisition of multi-channel voiceprint signals, and is suitable for application scenes with high requirements on audio acquisition precision and anti-interference capability, such as equipment fault detection, abnormal sound wave monitoring, voiceprint recognition and the like.

To provide a remote control circuit for a voice-controlled CD player, which realizes dual control by voice and buttons, improves operation convenience, is network-independent, highly stable, and easy to upgrade. [Solution] The remote control circuit for a voice-controlled CD player includes a power supply module that provides stable voltage, an input module including a metal dome 1 and an electret microphone 2 that receive manual and voice commands respectively, a voice recognition module that performs offline recognition of voice commands, a control module that processes the commands and sends them to a wireless transmission module, a memory module, the wireless transmission module that sends control signals to the CD player, a display module that displays the operating status, and a software upgrade module that supports system upgrades.

The invention discloses a gas compressor real-time monitoring system and method, and belongs to the technical field of gas compressor state monitoring, and the system comprises a sensor module, a data acquisition module, a data processing module, a data transmission module and an early warning module. The sensor module comprises a platinum resistance sensor, a piezoelectric pressure sensor, an electret microphone sensor and a vibration sensor. According to the real-time monitoring system and method for the gas compressor, temperature, pressure, sound and vibration are detected at the same time, the running state of the gas compressor can be reflected more comprehensively, interference information in data can be eliminated by preprocessing the data, judgment deviation is reduced, a dynamic threshold value is corrected according to the actual working condition, and the real-time monitoring effect of the gas compressor is improved. And the early warning accuracy is improved.

The invention discloses an integrated multi-parameter sensor suitable for monitoring a distribution transformer, and the sensor comprises a housing, the interior of the housing is a double-layer structure, the lower layer is provided with an audible sound sensor module and a magnetic flux leakage sensor module, and an electret microphone and a Hall element face a sensing side; an ultrasonic sensor probe, a temperature sensor probe, a vibration sensor probe, a temperature transmitting module and an IEPE conditioning module are arranged on the upper layer, the temperature transmitting module is connected with the temperature sensor probe, the vibration sensor probe is connected with the IEPE conditioning module, and the IEPE conditioning module is independently arranged on one side of the double-layer structure; the temperature sensor probe, the vibration sensor probe and the ultrasonic sensor probe are arranged on different sides. The integrated design reduces the installation complexity, achieves the precise monitoring of the five parameters of ultrasonic, audible sound, magnetic flux leakage, temperature and vibration of the transformer in a narrow space, meets the requirements of light weight and miniaturization, comprehensively captures the potential faults of the distribution transformer, and improves the accuracy of fault early warning.

The utility model discloses a low-power-consumption circuit structure for a Bluetooth earphone, which comprises a control module for selecting the use mode of the Bluetooth earphone and an endurance module for switching to low energy consumption of the Bluetooth earphone according to the control module, and the control module is electrically connected with the endurance module; according to the utility model, through the synergistic effect of the low electric quantity automatic selection circuit and the volume control circuit, the low energy consumption mode is automatically triggered and the music volume is reduced when the electric quantity is detected to be lower than a threshold value, the reduction amplitude is about 30-50%, and the non-perception endurance is prolonged. Compared with a traditional manual switching mode, endurance time can be prolonged additionally, the system is especially suitable for continuous playing requirements in a light sleep scene, a dual verification mechanism of the voice control unit and voice instructions of the electret microphone and the LD3320 voice recognition chip are adopted to improve recognition precision, a trigger circuit composed of an STM32 microcontroller and a relay is matched, and the system is simple in structure and convenient to use. The false touch rate of the touch sensor is reduced, and unnecessary power consumption caused by false touch can be avoided.

The utility model discloses an electret microphone, which relates to the field of microphones and comprises a shell, a supporting block fixedly connected to the left side of the shell, a rotating rod movably connected to the inside of the supporting block, a baffle fixedly connected to one side of the rotating rod, a clamping hole formed in the baffle, a connecting block fixedly connected to the position, close to the supporting block, of the left side of the shell. An adjusting groove is formed in the connecting block, and a telescopic rod is arranged in the adjusting groove; compared with the prior art, the microphone has the advantages that the connecting port can be protected through the connecting block, the telescopic rod, the spring, the clamping rod, the baffle and other assemblies, dust and other impurities are effectively prevented from entering the microphone, normal use of the microphone is ensured, and meanwhile the service life of the microphone can be prolonged; the circuit board can be quickly assembled and disassembled through assemblies such as a clamping ring, a clamping ring, a threaded sleeve and a threaded column, so that the circuit board can be overhauled after being used for a long time, and meanwhile, the overhauling difficulty can also be reduced.

The utility model discloses a sleep detection pillow based on Bluetooth, which comprises a pillow main body, and a control circuit and a plurality of electret microphones are arranged in the pillow main body; the control circuit comprises a microcontroller MCU, a power supply module, a Bluetooth module and a data storage module; the electret microphones are distributed on the top surface of the pillow main body and are used for collecting sound made by a sleeper; the power supply module is used for connecting an external power supply and providing electric energy for the control circuit; the MCU is connected with the sound acquisition module and transmits acquired sound data to the remote monitoring device through the Bluetooth module; and the data storage module is connected with the microcontroller MCU and is used for storing the collected sound data. The sleep detection pillow based on the Bluetooth has the advantages of being capable of collecting state parameters of a sleeper and transmitting the state parameters to the remote monitoring device, low in power consumption, free of influence on sleep and the like.

The utility model discloses an anti-power-frequency microphone, and the microphone comprises a microphone unit which is provided with a circuit board as a front surface; the metal foil covers the circuit board and is in conformal fit with the circuit board; and the adhesive is arranged between the circuit board and the metal foil. According to the anti-power-frequency microphone provided by the invention, the metal foil covers the circuit board of the microphone unit, and the metal foil and the circuit board are conformally attached, so that the anti-power-frequency interference of the microphone unit can be better realized. The design is suitable for an electret microphone with a small size and a limited circuit space, especially a unidirectional microphone product.

The utility model discloses a testing device for a miniature electret microphone amplifier, which relates to the technical field of testing devices for miniature electret microphone amplifiers and comprises a testing device body. A placement groove is formed in the middle of the upper surface of the test equipment body, fixed abutting plates are slidably connected to the left side and the right side of the interior of the placement groove, and a protective pad is fixedly connected to one side of each fixed abutting plate; a plurality of abutting plate sliding grooves are formed in the front side and the rear side of the fixed abutting plate, and the other side of the fixed abutting plate is fixedly connected with a threaded rod. The four ends of the upper side of the test equipment main body are fixedly connected with telescopic outer rods, and the upper sides of the telescopic outer rods are slidably connected with telescopic inner rods; a first connecting rod is fixedly connected to one side of the telescopic inner rod, an outer fixing block is fixedly connected to the outer side of the first connecting rod, and a second connecting rod is fixedly connected to one side of the outer fixing block; a fixing frame sliding groove is formed in the middle of the lower surface of the second connecting rod, and a detector fixing frame is slidably connected to the outer side of the fixing frame sliding groove.

The utility model provides a device for testing directivity of an electret microphone, which comprises a bottom table and a support connected to the top of the bottom table through a lifting assembly, the inner wall of the top of the bottom table is rotatably connected with a turntable, the top of the turntable is provided with a clamping assembly for fixing the electret microphone, and the clamping assembly is connected with the lifting assembly. Two symmetrically-arranged vacuum tubes are fixed to the top of the bottom table through bolts, a sounder and a sound receiver are fixedly connected to the inner walls of the two vacuum tubes correspondingly, a rotating shaft is fixedly connected to the bottom of the clamping assembly, and the other end of the rotating shaft is fixedly connected with a first motor through a coupler. Through arrangement of the turntable, the rotating shaft and the first motor, the direction of the electret microphone can be changed under transmission cooperation of the turntable, the rotating shaft and the first motor, compared with manual operation, the accuracy is higher, the test precision is improved, a vacuum tube is arranged, a stronger output signal can be generated, and the test efficiency is improved. And the accuracy of the test result cannot be influenced by attenuation of the sound wave in the transmission process.

The utility model is suitable for the field of vibration detection, provides a kind of anti misjudgment vibration detection device, including vibration detection module, sound detection module, main control module, alarm module and shell;The vibration detection module adopts magnetic displacement sensor, for detecting vibration mechanical wave and conversion into electric signal;The sound detection module adopts directional electret microphone, for picking up the sound wave signal generated by impact and conversion into electric signal;The vibration detection module and sound detection module are respectively connected with special amplification circuit, and electric signal is amplified to the detectable range of main control module;In the utility model, through the double signal fusion mode of vibration detection and sound detection combination, the accurate processing of signal in combination with special amplification circuit, utilize directional microphone to filter non-front sound interference and adjustable reference value to filter slight vibration interference, can effectively distinguish real vibration and interference signal, greatly reduce the probability of misjudgment, ensure that detection result is reliable.

A microphone includes a transducer element formed of a permanently charged, cellular ferroelectret film with electrodes on opposing surfaces. The transducer is mounted directly against a rigid support surface, eliminating the traditional air gap found in electret microphones. This configuration allows the microphone to withstand very high sound pressure levels without distortion. The support surface or housing is made of acoustically neutral material, such as polyurethane with Shore 90A hardness, to prevent tonal coloration caused by structural resonance. In one embodiment, the transducer structure is fabricated from a single sheet of ferroelectret film with printed electrodes on both sides, folded along perforated lines to create a compact, EMI-shielded unit. The design simplifies production by eliminating multi-layer laminations and reducing component count, while maintaining high signal fidelity. The microphone is especially suited for musical instruments and other high- SPL applications requiring accurate sound reproduction.

The invention belongs to the technical field of microphones, and relates to a film covering device and method for a rear pole plate of an electret microphone, and the device comprises a film tensioning ring which is used for continuously fixing an electret film with a certain tension; the rear polar plate jig is positioned below the film tensioning ring and is used for mounting a rear polar plate; the lifting platform is positioned below the rear polar plate jig and is used for bearing the rear polar plate jig and controlling the lifting of the rear polar plate jig, and the maximum height that the rear polar plate jig can reach is higher than the plane where the electret film is fixed by the film tensioning ring; and the hot pressing part is positioned above the thin film tensioning ring and is used for implementing hot pressing to cover the electret thin film on the rear polar plate. The film tensioning ring is used for fixing the electret film, the electret film is continuously fixed with certain tension, the film laminating tension is guaranteed, and the adverse effect of high-temperature hot pressing on the film laminating effect is reduced.

The utility model provides a vibration assembly and an electret microphone. The vibration assembly comprises a vibration ring, a vibrating diaphragm, a gasket and a back pole plate which are sequentially arranged in an overlapped mode. The vibrating diaphragm comprises an elastic diaphragm and a conductive layer arranged on the elastic diaphragm. The vibrating ring comprises a conductive part, the conductive part comprises inner edge notches which are arranged at intervals in the circumferential direction of the inner edge of the vibrating ring, the vibrating diaphragm corresponding to the inner edge notches forms an insulating area, and the vibrating diaphragm in the insulating area is insulated from the vibrating diaphragm in a non-insulating area. According to the vibration assembly and the electret microphone provided by the invention, the parasitic capacitance can be effectively reduced, the sensitivity is improved, and the tone quality is improved.

The invention discloses a watermelon maturity detector which comprises a control circuit board, a display screen, an MEMS acceleration sensor, a camera, an electret microphone, an infrared distance meter and a shell with a striking hammer, and the striking hammer ensures consistent striking power through fixed stroke and spring design; the detection method of the watermelon maturity detector comprises the following steps: acquiring an appearance image and distance information, and performing deep learning processing to obtain a visual maturity score; the watermelon is knocked to collect sound and vibration signals, and an acoustic maturity score is obtained after processing; and fusing the two through a machine learning model, dynamically adjusting the weight, and outputting a maturity result. According to the method, the watermelon maturity is accurately evaluated through the visual features and the acoustic features, and the accuracy and the stability of maturity detection are improved.

An electret microphone is provided. It comprises an electrically conductive membrane and a counter-electrode having at least one first hole at a first distance from an edge of the counter-electrode, and a second plurality of second holes each at a second distance from the edge. The second distance is shorter than the first. The microphone includes a first electrically conductive coating on a first side of the counter-electrode and a second electrically conductive coating on a second side. The at least one first hole comprises a via to electrically contact the first and second coatings. A third distance is provided between the second holes and the first coating so that the first coating does not extend to the second holes. The microphone further comprises a polarizable film extending completely over the first coating while leaving the first and second holes free, and extending to the second holes.

The invention relates to the technical field of electro-acoustic conversion, and discloses an improved low-noise electret microphone power supply circuit and audio equipment. The power supply circuit comprises a power input end, a reference voltage generation module and a differential operational amplifier module. An in-phase input end of the differential operational amplifier module is connected to a power supply input end through a first RC filter network, and receives a reference voltage VREF to set an output direct current level; the inverting input end is connected to the power supply input end through a second RC filter network, and the network is configured to isolate the direct current component and couple the power supply alternating current ripple component to the inverting end. Through the unique configuration, power supply ripples serve as common-mode signals to be led into the two input ends of the operational amplifier, effective suppression is carried out through the high common-mode rejection ratio characteristic of the operational amplifier, and finally pure low-ripple direct-current voltage is output to supply power to the electret microphone sensor. According to the invention, excellent power supply noise suppression is realized through a low-cost and small-size scheme, and the audio acquisition quality is remarkably improved.

An electret microphone includes a microphone capsule with an output connection, a first input connection as an earth connection and a second input connection for providing a supply voltage and for leading out a microphone output signal. A cascode includes first and second transistors, wherein the microphone capsule's output is input to the cascode. The second transistor is an FET having a gate coupled to the microphone capsule's output connection and a drain coupled to the first transistor's emitter when bipolar or source when a FET. A third transistor, which is bipolar has an emitter coupled to the second input connection, a collector coupled via a capacitor to earth, and a base coupled via a resistance to the second input connection and the first transistor's collector when bipolar or drain when a FET, wherein a resistance exists between the second transistor's drain and the third transistor's collector.

The present invention discloses a musical instrument pickup system for live streaming, which relates to the technical field of pickup systems. The system solves the problems of inconvenience in recording sound sources from different locations, poor recording quality, and inconvenience in conducting live streaming activities. Its technical key points are: it includes a DSP module, a sound receiving module, an output module, a power supply module, and a control module. The sound receiving module includes a built-in microphone circuit, an external microphone circuit, and a sensor input circuit. The output module includes a digital-to-analog converter, a mobile phone live streaming connection circuit, a pre-stage audio output circuit, and a headphone output circuit. It can respectively utilize the built-in electret microphone, the external microphone, and the pickup to collect audio signals from different locations, thereby recording clearer sound and improving the recording quality. This system achieves the advantages of being able to conveniently record sound sources from different locations and having better recording quality. It has good commercial application prospects and can bring greater convenience to people's entertainment life.

The utility model discloses an efficient device for coating FEP film on electret microphone, which comprises a support table, a rear polar plate clamp, a heating module, a distance module and a vacuum module, an inner cavity is arranged in the support table, the rear polar plate clamp is arranged on the support table, and the distance module is arranged in the inner cavity. At least one through hole and a rear polar plate fixing groove are formed in the rear polar plate clamp in a combined mode, the through hole and the vacuum module are both connected with the inner cavity, and the distance fixing module is used for extruding a rear polar plate fixed to the rear polar plate clamp. The utility model aims to solve the technical problems in the prior art, and provides the efficient device for laminating the FEP thin film on the electret microphone, which can directly press and paste the FEP thin film without generating wrinkles and bubbles, and ensures that the thicknesses of the pasted films are the same.

The unidirectional electret microphone comprises a back pole plate, plastic rings are fixed at the two ends of the back pole plate, an integrated shell is fixed on the inner sides of the plastic rings, and the plastic rings are used for fixing the integrated shell and the back pole plate. A center hole is formed in the middle of the integrated shell, and a damping net is adhered to the center hole. The single-directional electret microphone has the advantages that the number of components in the single-directional electret microphone is reduced from original 6 to 4, the assembly efficiency of the microphone can be improved by reducing the number of the components, and the performance and consistency of the microphone can be improved.