13 results about "Electret microphone" patented technology

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 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.

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 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 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 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.

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 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.