CN212086494U - Microphone calibration board and microphone calibration system - Google Patents
Microphone calibration board and microphone calibration system Download PDFInfo
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- CN212086494U CN212086494U CN202021144284.9U CN202021144284U CN212086494U CN 212086494 U CN212086494 U CN 212086494U CN 202021144284 U CN202021144284 U CN 202021144284U CN 212086494 U CN212086494 U CN 212086494U
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Abstract
The utility model discloses a microphone calibration board and microphone test system, this calibration board includes: an electric control board; the microphone calibration modules are arranged on the electric control board; the power supply output end of each microphone calibration module is connected with the power supply end of a microphone to be tested, and the output signal sampling end of each microphone calibration module is connected with the output end of the microphone to be tested; the output end of each microphone calibration module is connected with the main controller; each microphone calibration module is configured to output the power supply initial voltage to the corresponding microphone to be tested and sample the output signal of the microphone to be tested; and the main controller is configured to output the output signal to the upper computer after signal processing, generate corresponding power supply calibration voltage and output a calibration signal according to the calibration control signal output by the upper computer, and calibrate the corresponding microphone to be tested through the microphone calibration module. The utility model provides high efficiency of software testing and test accuracy of microphone.
Description
Technical Field
The utility model relates to a microphone technical field, in particular to microphone calibration board and microphone calibration system.
Background
The microphone is used as a common electronic device in daily life and is increasingly applied to various electronic devices, a microphone calibration product needs to be calibrated in the microphone manufacturing process, when the microphone is calibrated and simulated on line, the number of the cascade board cards is limited usually in a mode of cascading the board cards through a CAN bus, due to the limitation of a backboard slot, the maximum MIC calibration number cannot meet the maximum production line calibration requirement temporarily, and meanwhile, the volume of the calibration device is very large; because the communication mode between the calibration board and the CAN bus is asynchronous communication, a little time delay exists, and the inaccuracy of calibration data CAN be caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a microphone calibration board and microphone calbiration system aims at improving the efficiency of software testing and the test accuracy of microphone.
In order to achieve the above object, the utility model provides a microphone calibration plate, microphone calibration plate includes:
an electric control board;
the main controller is arranged on the electric control board; the main controller is configured to generate and output a power supply initial voltage;
the microphone calibration modules are arranged on the electric control board; the power supply output end of each microphone calibration module is connected with the power supply end of a microphone to be tested, and the output signal sampling end of each microphone calibration module is connected with the output end of the microphone to be tested; the output end of each microphone calibration module is connected with the main controller; each microphone calibration module is configured to output the power supply initial voltage to the corresponding microphone to be tested and sample an output signal of the microphone to be tested;
the main controller is also configured to output the output signal to an upper computer after signal processing, and generate corresponding power supply calibration voltage and output calibration signals according to the calibration control signal output by the upper computer so as to calibrate the corresponding microphone to be tested through the microphone calibration module.
Optionally, each of the microphone calibration modules includes:
the input end of the power supply processing circuit is connected with the power supply output end of the main controller, the output end of the power supply processing circuit is the power supply output end of the microphone calibration module, and the power supply processing circuit is configured to perform digital-to-analog conversion and amplification processing on the power supply initial voltage and the power supply calibration voltage output by the main controller and then output the power supply initial voltage and the power supply calibration voltage to the corresponding microphone to be tested;
the first input/output end of the output signal acquisition/calibration circuit is connected with the main controller, and the second input/output end of the output signal acquisition/calibration circuit is connected with the microphone to be tested; the output signal acquisition/calibration circuit is configured to sample the output signal of the microphone under test and the output calibration signal.
Optionally, the power supply processing circuit includes a first digital-to-analog conversion circuit and a power amplification circuit, and the first digital-to-analog conversion circuit and the power amplification circuit are sequentially connected to the main controller.
Optionally, the power amplifying circuit includes a first operational amplifier and a first power switch tube, an input end of the first operational amplifier is connected to an output end of the first digital-to-analog conversion circuit, an output end of the first operational amplifier is connected to an input end of the first power switch tube, and an output end of the first power switch tube is connected to a power supply end of the microphone to be tested.
Optionally, the output signal collecting/calibrating circuit includes an output signal collecting circuit, an output signal calibrating circuit and a switching circuit, a common end of the switching circuit is connected with an output end of the microphone to be tested, a first end of the switching circuit is connected with an input end of the output signal collecting circuit, a second end of the switching circuit is connected with an output end of the output signal calibrating circuit, and an output end of the output signal collecting circuit and the output signal calibrating circuit are respectively connected with the main controller.
Optionally, the output signal acquisition circuit includes a conditioning circuit and an analog-to-digital conversion circuit, the input end of the conditioning circuit is the input end of the output signal acquisition circuit, the conditioning circuit is connected with the input end of the analog-to-digital conversion circuit, and the output end of the analog-to-digital conversion circuit is connected with the main controller.
Optionally, the output signal calibration circuit includes a second digital-to-analog conversion circuit, a second operational amplifier, and a second power switch tube, an input end of the second operational amplifier is connected to an output end of the second digital-to-analog conversion circuit, an output end of the second operational amplifier is connected to an input end of the second power switch tube, and an output end of the second power switch tube is connected to a power supply end of the microphone to be tested.
Optionally, the main controller is any one or a combination of multiple kinds of FPGA, a single chip microcomputer and a DSP.
Optionally, the microphone calibration board further includes a communication interface circuit, and the communication interface circuit is configured to implement communication connection between the main controller and the upper computer.
The utility model discloses still provide a microphone calibration system, reach as above including the host computer microphone calibration board, microphone calibration board with the host computer electricity is connected.
The utility model discloses a set up a plurality of microphones calibration module on automatically controlled board, each microphone calibration module is for exporting the initial voltage of supplying power to corresponding the microphone that awaits measuring, and the sampling the output signal to main control unit of microphone that awaits measuring to carry out output to the host computer after signal processing with output signal, and according to the calibration control signal of host computer output, produce corresponding power supply calibration voltage and output calibration signal, with passing through microphone calibration module calibrates the microphone that awaits measuring that corresponds. The utility model discloses an output signal is gathered to each microphone calibration module to export to main control unit, main control unit is unified exports output signal to main control unit, can realize that the test in the testing process of microphone is synchronous, accomplishes multichannel simulation microphone output signal's parallel processing, when reducing microphone feedback data, and the time delay on the communication reduces the test result error rate, the utility model discloses be favorable to improving the efficiency of software testing and the test accuracy of microphone.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an embodiment of a microphone calibration board according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the microphone calibration module shown in fig. 1.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The utility model provides a microphone calibration board.
A Microphone (MIC, Microphone) generally includes an acoustic-electric conversion component and an amplifier, wherein the acoustic-electric conversion component converts sound into a weak electrical signal, and the amplifier converts the weak electrical signal into a voltage signal with a specific magnitude after buffering and amplifying the weak electrical signal. For example, in a typical capacitive acoustic-electric conversion module, a capacitor is formed by a fixed plate and a vibrating plate vibrating with sound pressure, the external sound wave drives the vibrating plate to move, so that a gap between the fixed plate and the vibrating plate changes to change the size of the capacitor, and the sound is detected by detecting the change in the capacitance between the two plates of the capacitor. For example, a fixed bias voltage is set on the fixed plate, so that the change of capacitance generates charge change on the vibrating plate, and a voltage signal with specific magnitude and direction can be obtained after the charge change is amplified by the amplifying circuit. In order to improve the sensitivity of the microphone, the microphone needs to be calibrated, and the microphone calibration is generally performed after the microphone is manufactured in its entirety, and is realized by changing the gain of the amplifier. At present, when a product line for calibrating an analog MIC is calibrated, the number of cascade board cards is limited by a CAN bus cascade board card mode due to the limitation of a back board slot, the maximum MIC calibration number cannot meet the maximum calibration requirement of a production line temporarily, and meanwhile, the volume of calibration equipment is very large; because the communication mode between the calibration board and the CAN bus is asynchronous communication, a little time delay exists, and the inaccuracy of calibration data CAN be caused.
In order to solve the above problem, referring to fig. 1 and 2, in an embodiment of the present invention, the microphone calibration board includes:
an electric control board 100;
the main controller 10 is arranged on the electric control board 100; the main controller 10 configured to generate and output a power supply initial voltage;
a plurality of microphone calibration modules 20 disposed on the electronic control board 100; the power output end of each microphone calibration module 20 is connected with the power end VDD of a microphone 200 to be tested, and the output signal sampling end of each microphone calibration module 20 is connected with the output end VOUT of the microphone 200 to be tested; the output end of each microphone calibration module 20 is connected with the main controller 10; each microphone calibration module 20 is configured to output the power supply initial voltage to the corresponding microphone 200 to be tested, and sample an output signal of the microphone 200 to be tested;
the main controller 10 is further configured to output the output signal to the upper computer 300 after signal processing, and generate a corresponding power supply calibration voltage and output a calibration signal according to the calibration control signal output by the upper computer 300, so as to calibrate the corresponding microphone 200 to be tested through the microphone calibration module 20.
In this embodiment, the electronic control board 100 may be implemented by a circuit substrate made of DBC board, PCB board, half-glass fiber board, or any one of an aluminum substrate, an aluminum alloy substrate, a copper substrate, or a copper alloy substrate. The shape of the electronic control board 100 can be set according to the applied microphone calibration board, for example, the specific location, number and size of the electronic devices in the microphone calibration board, and the electronic control board 100 can be circular, but is not limited to circular. When the electronic control board 100 is implemented by using a PCB, the PCB includes a circuit wiring layer and an insulating layer, and the circuit wiring layer forms a corresponding circuit and a mounting position, i.e. a pad, corresponding to the electronic component in the main controller 10 and the plurality of microphone calibration modules 20 on the electronic control board 100 according to the circuit design of the microphone calibration board. Specifically, after an insulating layer is provided on the electronic control board 100, a copper foil is laid on the insulating layer and etched according to a preset circuit design, thereby forming a circuit wiring layer. After the electronic components in the digital microphone calibration board are integrated in the circuit wiring layer on the electronic control board 100, the electrical connection between the electronic components can also be realized through the metal leads.
The main controller 10 may be implemented by any one of microprocessors such as an FPGA, a single chip microcomputer, and a DSP, and the FPGA, the single chip microcomputer, and the DSP may also be implemented in various combinations. Those skilled in the art can realize the processing of decoding, filtering, etc. of the output signal by integrating some hardware circuits and software programs or algorithms in the main controller 10, for example, hardware circuits such as a decoder, a power generation circuit, and a filter are integrated, or software algorithm programs for analyzing and comparing the received output signal, the calibration data information outputted by the upper computer 300, etc. The calibration of each microphone is accomplished by running or executing software programs and/or modules stored in the memory of the main controller 10, calling data stored in the memory, and comparing, analyzing, etc. the output signals and the calibration data information output by the upper computer 300 through software algorithm programs and/or hardware circuit modules integrated in the main controller 10. In this embodiment, an FPGA may be optionally used to implement the calibration, where the FPGA serves as a microprocessor, and those skilled in the art can integrate some hardware circuits and software programs into the FPGA to implement the control of the microphone calibration board. The FPGA is used as a center for data information processing, various interfaces and lines can be utilized to connect various parts of the whole microphone calibration board, and various functions and processing data of the microphone calibration board are executed by operating or executing software programs and/or modules stored in the storage component module and calling the data stored in the storage component module, so that the microphone calibration board is monitored integrally. FPGA (field programmable Gate array) is a product of further development on the basis of programmable devices such as PAL, GAL and the like. The circuit is a semi-custom circuit in the field of Application Specific Integrated Circuits (ASIC), not only overcomes the defects of the custom circuit, but also overcomes the defect that the number of gate circuits of the original programmable device is limited. Compared with chips such as a CPU, a GPU and an ASIC, the FPGA has the advantages of high energy efficiency, low delay, stability and the like. The FPGA can be used as a sound detection modulation device, a receiving component or a coder/decoder device, the FPGA is connected with each microphone calibration module 20 respectively, supplies power to each microphone, adjusts the voltage provided, acquires the output signal output by the microphone, decodes, filters and the like, and outputs the output signal to the upper computer 300. The number of the microphone calibration modules may be set to be multiple, the multiple microphone calibration modules are respectively marked as 201, 202 …, and 20N, and the number of the microphone calibration modules may be specifically set to be 48 in this embodiment.
It should be noted that, during microphone testing, each microphone needs to be calibrated, and the calibration can be implemented by adjusting gain and the like, so that the acquired signal and the output signal of the microphone are matched with each other, and after the calibration is completed, the program burning operation is performed. For example, a sound sensor (e.g., a MEMS chip) that can perform acoustic-electric signal conversion and an integrated circuit (e.g., an ASIC chip) portion, which is typically implemented by an amplifier, a bias voltage generator, and a memory, are provided in a microphone. The memory stores data for adjusting the bias voltage generator and data for gain adjustment of the amplifier. The output calibration signal is written into the memory through the data interface so as to adjust the amplification factor of the amplifier, thereby achieving the aim of microphone calibration. The amplification factor or gain adjustment needs to be adjusted according to the acquired microphone output signal (data signal).
Therefore, in this embodiment, one microphone calibration module 20 is disposed corresponding to one microphone, and the microphone calibration module 20 can complete acquisition of an output signal of the corresponding microphone, and output the output signal to the FPGA after performing impedance matching, filtering, signal isolation and other processing on the output signal, or output the output calibration signal output by the FPGA to the microphone after performing impedance matching, filtering, signal isolation and other processing on the output calibration signal. Specifically, the FPGA outputs a power supply initial voltage to each microphone calibration module 20, each microphone calibration module 20 performs digital-to-analog conversion and power amplification on the power supply initial voltage, and outputs the power supply initial voltage to a corresponding microphone to drive the microphone to work, and after the microphone is powered on, the microphone converts the sensed sound signal into an electrical signal, completes the conversion between the sound and the electrical signal, and outputs an output signal to the corresponding microphone calibration module 20. The microphone calibration module 20 performs impedance matching, filtering, signal isolation and other processing on the received output signal, and outputs the output signal to the FPGA, and the FPGA analyzes the received output signal (the FPGA is used as a device for encoding or decoding a digital signal stream or signal or a computer program storing the encoded or decoded digital signal stream or signal), and outputs the output signal to the upper computer 300 after filtering processing, so that the upper computer 300 generates calibration data information according to the received output signal and returns the calibration data information to the middle FPGA. The FPGA outputs calibration data information according to the upper computer 300 to generate a power supply calibration voltage and output a calibration signal, performs impedance matching, filtering, signal isolation and other processing by each microphone calibration module 20, outputs the processed data to the microphone, provides the calibrated power supply calibration voltage, writes gain parameters into Codec configuration files of the microphone, and completes SIN calibration and CODE calibration of each microphone.
The utility model discloses a set up a plurality of microphones calibration module 20 on automatically controlled board 100, each microphone calibration module 20 is for exporting the initial voltage of will supplying power to corresponding the microphone 200 that awaits measuring, and the sampling the output signal to main control unit 10 of microphone 200 that awaits measuring to carry out signal processing back output to host computer 300 with output signal, and according to the calibration control signal of host computer 300 output, produce corresponding power supply calibration voltage and output calibration signal, with passing through microphone calibration module 20 calibrates the microphone 200 that awaits measuring that corresponds. The utility model discloses an output signal is gathered to each microphone calibration module 20 to export to main control unit 10, main control unit 10 is unified to export output signal to main control unit 10, and the test in the test process that can realize a plurality of microphones is synchronous, accomplishes multichannel simulation microphone output signal's parallel processing, when reducing microphone feedback data, and the time delay on the communication reduces the test result error rate, the utility model discloses be favorable to improving the efficiency of software testing and the test accuracy of microphone.
Referring to fig. 1 and 2, in an embodiment, each of the microphone calibration modules 20 includes:
the input end of the power supply processing circuit 21 is connected with the power supply output end of the main controller 10, the output end of the power supply processing circuit 21 is the power supply output end of the microphone calibration module 20, and the power supply processing circuit 21 is configured to perform digital-to-analog conversion and amplification processing on the power supply initial voltage and the power supply calibration voltage output by the main controller 10 and then output the power supply initial voltage and the power supply calibration voltage to the corresponding microphone 200 to be tested;
an output signal collecting/calibrating circuit 22, a first input/output end of the output signal collecting/calibrating circuit 22 is connected with the main controller 10, and a second input/output end of the output signal collecting/calibrating circuit 22 is connected with an output end VOUT of the microphone 200 to be tested; the output signal acquisition/calibration circuit 22 is configured to sample the output signal of the microphone under test 200, and the output calibration signal.
It can be understood that the driving voltage of the main controller 10 is usually 3.3V or 5V, the driving voltage of the microphone is greater than the driving voltage of the main controller 10, and the driving voltage output by the main controller 10 is usually a digital voltage, in order to make the main controller 10 drive the microphone to work better, the power processing circuit 21 of the embodiment performs digital-to-analog conversion and power amplification on the power supply initial voltage and the power supply calibration voltage output by the main controller 10, and outputs the power supply initial voltage and the power supply calibration voltage to the microphone so as to drive the microphone to work.
The output signal collecting/calibrating circuit 22 can perform multiplexing, that is, in the process of calibrating the microphone, the output signal output by the microphone can be collected, and meanwhile, when the main controller 10 calibrates the microphone, the data signal (output calibrating signal) output by the main controller 10 can be output to the microphone after being processed by impedance matching, EMC electromagnetic compatibility protection, active filtering and the like, so as to realize writing and burning of the data signal (output calibrating signal).
Referring to fig. 1 and fig. 2, in an embodiment, the power processing circuit 21 includes a first digital-to-analog conversion circuit 211 and a power amplification circuit 212, and the first digital-to-analog conversion circuit 211 and the power amplification circuit 212 are sequentially connected to the main controller 10.
In this embodiment, according to the type of the microprocessor used by the main controller 10, for example, when the FPGA is used for implementation, the power processing circuit 21 is provided with a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is used for converting a digital power supply initial voltage or a power supply calibration voltage into an analog power supply initial voltage and a power supply calibration voltage. The power amplifying circuit 212 is configured to output the power amplified initial power supply voltage or power amplified calibration voltage to the microphone to drive the microphone to operate.
The power amplifying circuit 212 may specifically be implemented by using a first operational amplifier U1 and a first power switch Q1, an input end of the first operational amplifier U1 is connected to an output end of the first digital-to-analog conversion circuit 211, an output end of the first operational amplifier U1 is connected to an input end of the first power switch Q1, and an output end of the first power switch Q1 is connected to a power source terminal VDD of the microphone to be tested.
In this embodiment, the power switching tube may be implemented by an MOS tube, an IGBT, or the like, and the operational amplifier and the power switching tube amplify power of the power supply initial voltage or the power supply calibration voltage after digital-to-analog conversion and output the amplified power to the microphone to drive the microphone to operate.
Referring to fig. 1 and 2, in an embodiment, the output signal collecting/calibrating circuit 22 includes an output signal collecting circuit 221, an output signal calibrating circuit 222, and a switching circuit 223, a common terminal of the switching circuit 223 is connected to the microphone 200 to be tested, a first terminal of the switching circuit 223 is connected to an input terminal of the output signal collecting circuit 221, a second terminal of the switching circuit 223 is connected to an output terminal of the output signal calibrating circuit 222, and an output terminal of the output signal collecting circuit 221 and the output signal calibrating circuit 222 are respectively connected to the main controller 10.
In this embodiment, the switching circuit 223 is configured to switch the connection between the output signal acquisition circuit 221 and the output signal calibration circuit 222 and the microphone, and when the switching circuit 223 controls the output signal acquisition circuit 221 to be connected to the signal output end of the microphone, the output signal acquisition circuit 221 performs impedance matching, filtering, signal isolation and other processing on the acquired and received output signal, and outputs the processed output signal to the FPGA. When the switching circuit 223 controls the output signal calibration circuit 222 to be connected to the signal output end of the microphone, the output signal calibration circuit 222 is configured to perform impedance matching, filtering, signal isolation and other processing on the output calibration signal output by the FPGA and output the output calibration signal to the microphone. The switching circuit 223 may be specifically implemented by a mechanical switch such as a three-terminal relay, an electronic switch such as a two-way analog switch, and a switch capable of implementing path switching.
Referring to fig. 1 and fig. 2, in an embodiment, the output signal acquiring circuit 221 includes a conditioning circuit 2211 and an analog-to-digital conversion circuit 2212, an input end of the conditioning circuit 2211 is an input end of the output signal acquiring circuit 221, the conditioning circuit 2211 is connected to an input end of the analog-to-digital conversion circuit 2212, and an output end of the analog-to-digital conversion circuit 2212 is connected to the main controller 10.
In this embodiment, the conditioning circuit 2211 may specifically be implemented by using an impedance transformation network, an EMC protection circuit, and the like, and in a further embodiment, the conditioning circuit 2211 may further include an active filter circuit, where the active filter is serially connected between the second impedance transformation circuit and the second EMC protection circuit; alternatively, the active filter is disposed in series between the second impedance transformation circuit and the main controller 10.
Referring to fig. 1 and 2, in an embodiment, the output signal calibration circuit 222 includes a second digital-to-analog conversion circuit 2221, a second operational amplifier U2 and a second power switch Q2, an input terminal of the second operational amplifier U2 is connected to an output terminal of the second digital-to-analog conversion circuit 2221, an output terminal of the second operational amplifier U2 is connected to an input terminal of the second power switch Q2, and an output terminal of the second power switch Q2 is connected to the output terminal VOUT of the microphone under test.
In this embodiment, the power switch tube may be implemented by an MOS tube, an IGBT, or the like, and the operational amplifier and the power switch tube perform power amplification on the output calibration signal after digital-to-analog conversion and output the amplified signal to the microphone, so that the gain parameter is written into a Codec configuration file of the microphone, and SIN calibration and CODE calibration of each microphone are completed to perform microphone calibration.
Referring to fig. 1 and 2, in an embodiment, the microphone calibration board further includes a communication interface circuit 30, and the communication interface circuit 30 is configured to implement a communication connection between the main controller 10 and an upper computer 300.
In this embodiment, the communication interface circuit 30 may be a USB interface, a Type-C interface, or the like, which can realize the connection between the upper computer 300 and the main controller 10, and the upper computer 300 may be a computer, a mobile terminal, or a dedicated microphone testing device. In some embodiments, the upper computer 300 and the main controller 10 may further implement wireless communication connection through a wireless circuit, such as a bluetooth module, a WIFI module, an infrared transceiver module, and the like. The upper computer 300 stores a data analysis circuit, outputs program applications such as calibration data generation, performs digital filtering on the collected VOUT signal at the main controller 10, feeds back the signal to the PC end of the upper computer 300, and then the PC end generates calibration data information and transmits the calibration data information back to the main controller 10. So that the main controller 10 generates the VOUT calibration signal by controlling the D/a module in the microphone calibration module 20; the calibration of the output signal of the microphone is completed by controlling the D/A module to generate a VDD power supply/burning initial signal.
The utility model discloses still provide a microphone calibration system, reach as above including host computer 300 microphone calibration board, microphone calibration board with host computer 300 electricity is connected. The detailed structure of the microphone calibration board can refer to the above embodiments, and is not described herein; it can be understood that, because the utility model discloses used above-mentioned microphone calibration board in the microphone calibration system, consequently, the utility model discloses microphone calibration system's embodiment includes all technical scheme of the whole embodiments of above-mentioned microphone calibration board, and the technical effect who reaches is also identical, no longer gives details here.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. A microphone calibration board, characterized in that it comprises:
an electric control board;
the main controller is arranged on the electric control board; the main controller is configured to generate and output a power supply initial voltage;
the microphone calibration modules are arranged on the electric control board; the power supply output end of each microphone calibration module is connected with the power supply end of a microphone to be tested, and the output signal sampling end of each microphone calibration module is connected with the output end of the microphone to be tested; the output end of each microphone calibration module is connected with the main controller; each microphone calibration module is configured to output the power supply initial voltage to the corresponding microphone to be tested and sample an output signal of the microphone to be tested;
the main controller is also configured to output the output signal to an upper computer after signal processing, and generate corresponding power supply calibration voltage and output calibration signals according to the calibration control signal output by the upper computer so as to calibrate the corresponding microphone to be tested through the microphone calibration module.
2. The microphone calibration board of claim 1, wherein each of the microphone calibration modules comprises:
the input end of the power supply processing circuit is connected with the power supply output end of the main controller, the output end of the power supply processing circuit is the power supply output end of the microphone calibration module, and the power supply processing circuit is configured to perform digital-to-analog conversion and amplification processing on the power supply initial voltage and the power supply calibration voltage output by the main controller and then output the power supply initial voltage and the power supply calibration voltage to the corresponding microphone to be tested;
the first input/output end of the output signal acquisition/calibration circuit is connected with the main controller, and the second input/output end of the output signal acquisition/calibration circuit is connected with the microphone to be tested; the output signal acquisition/calibration circuit is configured to sample the output signal of the microphone under test and the output calibration signal.
3. The microphone calibration board of claim 2, wherein the power processing circuit comprises a first digital-to-analog conversion circuit and a power amplification circuit, which are in turn connected to the main controller.
4. The microphone calibration board according to claim 3, wherein the power amplifying circuit comprises a first operational amplifier and a first power switch, an input terminal of the first operational amplifier is connected to an output terminal of the first digital-to-analog converting circuit, an output terminal of the first operational amplifier is connected to an input terminal of the first power switch, and an output terminal of the first power switch is connected to a power supply terminal of the microphone to be tested.
5. The microphone calibration board according to claim 2, wherein the output signal acquisition/calibration circuit comprises an output signal acquisition circuit, an output signal calibration circuit, and a switching circuit, a common terminal of the switching circuit is connected to an output terminal of the microphone under test, a first terminal of the switching circuit is connected to an input terminal of the output signal acquisition circuit, a second terminal of the switching circuit is connected to an output terminal of the output signal calibration circuit, and the output terminal of the output signal acquisition circuit and the output signal calibration circuit are respectively connected to the main controller.
6. The microphone calibration board of claim 5, wherein the output signal acquisition circuit comprises a conditioning circuit and an analog-to-digital conversion circuit connection, wherein an input of the conditioning circuit is an input of the output signal acquisition circuit, the conditioning circuit is connected with an input of the analog-to-digital conversion circuit, and an output of the analog-to-digital conversion circuit is connected with the main controller.
7. The microphone calibration board according to claim 5, wherein the output signal calibration circuit comprises a second digital-to-analog conversion circuit, a second operational amplifier and a second power switch, an input terminal of the second operational amplifier is connected to an output terminal of the second digital-to-analog conversion circuit, an output terminal of the second operational amplifier is connected to an input terminal of the second power switch, and an output terminal of the second power switch is connected to a power supply terminal of the microphone under test.
8. The microphone calibration board according to any one of claims 1 to 7, wherein the main controller is any one or more of an FPGA, a single chip microcomputer and a DSP.
9. The microphone calibration board of any one of claims 1 to 7, further comprising a communication interface circuit configured to enable communication connection of the master controller with an upper computer.
10. A microphone calibration system comprising an upper computer and a microphone calibration board according to any one of claims 1 to 9, the microphone calibration board being electrically connected to the upper computer.
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| CN202021144284.9U CN212086494U (en) | 2020-06-17 | 2020-06-17 | Microphone calibration board and microphone calibration system |
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| CN202021144284.9U CN212086494U (en) | 2020-06-17 | 2020-06-17 | Microphone calibration board and microphone calibration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114615580A (en) * | 2022-05-12 | 2022-06-10 | 苏州敏芯微电子技术股份有限公司 | Microphone circuit and microphone packaging structure |
| WO2022127534A1 (en) * | 2020-12-16 | 2022-06-23 | 中兴通讯股份有限公司 | Amplitude and phase calibration method and device, storage medium, and electronic device |
-
2020
- 2020-06-17 CN CN202021144284.9U patent/CN212086494U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022127534A1 (en) * | 2020-12-16 | 2022-06-23 | 中兴通讯股份有限公司 | Amplitude and phase calibration method and device, storage medium, and electronic device |
| CN114615580A (en) * | 2022-05-12 | 2022-06-10 | 苏州敏芯微电子技术股份有限公司 | Microphone circuit and microphone packaging structure |
| CN114615580B (en) * | 2022-05-12 | 2022-08-05 | 苏州敏芯微电子技术股份有限公司 | Microphone circuit and microphone packaging structure |
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