MEMS microphone assembly and pickup system

Abstract

The MEMS microphone assembly comprises a power supply and signal adapter and a microphone head, the power supply and signal adapter comprises a shell and a circuit board arranged in the shell, the circuit board is provided with a signal switching module and a voltage stabilizing module, the input end of the signal switching module is connected with a microphone head interface, and the output end of the signal switching module is connected with a microphone head. The output end of the signal switching module is connected with a sound card interface, the input end of the voltage stabilizing module is connected with a power interface, and the output end of the voltage stabilizing module is connected with a microphone interface; the microphone head is connected with a signal transmission line, and the signal transmission line is connected with a first interface and is connected with the microphone head interface in an inserted mode through the first interface. According to the utility model, the microphone head can select the power supply and signal adapter for power supply and signal switching, or the microphone head can be directly connected with the sound card through the first interface, the power supply mode can be selected according to application requirements, and the use flexibility and convenience can be improved.

Description

Technical Field

[0001] This utility model relates to the field of audio technology, and in particular to a MEMS microphone assembly and sound pickup system. Background Technology

[0002] MEMS microphones (Micro-Electro-Mechanical Systems microphones) are small microphones based on semiconductor manufacturing technology. MEMS microphones are typically connected to and powered by a sound card. However, newer sound cards have removed the power supply circuitry for MEMS microphones during performance optimization, necessitating the design of a new MEMS microphone compatible with both new and older sound cards. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a MEMS microphone assembly and sound pickup system, equipped with a detachable power supply and signal adapter, allowing the power supply method to be selected according to application requirements.

[0004] On one hand, this utility model embodiment provides a MEMS microphone assembly, including:

[0005] A power supply and signal converter includes a housing and a circuit board disposed within the housing. The circuit board is provided with a signal conversion module and a voltage regulator module. The input terminal of the signal conversion module is connected to a microphone interface, and the output terminal of the signal conversion module is connected to a sound card interface. The input terminal of the voltage regulator module is connected to a power interface, and the output terminal of the voltage regulator module is connected to the microphone interface.

[0006] The microphone head is connected to a signal transmission line, which is connected to a first interface and plugged into the microphone head interface through the first interface.

[0007] According to some embodiments of the present invention, the voltage regulator module includes a low-dropout linear regulator chip, the input terminal of the low-dropout linear regulator chip is connected to a first filter unit, and the output terminal of the low-dropout linear regulator chip is connected to a second filter unit.

[0008] According to some embodiments of the present invention, the low dropout linear regulator chip is provided with a current limiting pin, and the current limiting pin is connected to a current limiting resistor.

[0009] According to some embodiments of the present invention, the low dropout linear regulator chip is provided with an output control pin, and the output control pin is connected to a voltage regulation resistor.

[0010] According to some embodiments of this utility model, the output control pin is also connected to a filter capacitor, and is connected to the reference voltage terminal through the filter capacitor.

[0011] According to some embodiments of the present invention, the low dropout linear regulator chip is provided with a voltage detection pin, and the output terminal of the low dropout linear regulator chip is connected to a voltage sampling branch, which is connected to the voltage detection pin.

[0012] According to some embodiments of the present invention, the signal conversion module includes a common-mode and differential-mode filtering unit, which is connected between the microphone interface and the sound card interface.

[0013] According to some embodiments of the present invention, the common-mode differential-mode filter unit includes a first resistor, a first capacitor, a second resistor, a second capacitor, and a third capacitor. The first end of the first resistor is connected to the first capacitor and is connected to a reference voltage terminal through the first capacitor. The first end of the second resistor is connected to the second capacitor and is connected to the reference voltage terminal through the second capacitor. The third capacitor is connected to the first end of the first resistor and the first end of the second resistor.

[0014] According to some embodiments of the present invention, the microphone interface and the power interface are disposed on the first side of the housing, and the sound card interface is disposed on the second side of the housing, with the first and second sides of the housing arranged opposite to each other.

[0015] On the other hand, this utility model embodiment provides a sound pickup system, including a sound card and the above-mentioned MEMS microphone assembly, wherein the sound card interface of the MEMS microphone assembly is connected to the sound card.

[0016] The embodiments of this utility model have at least the following beneficial effects:

[0017] When the sound card does not provide a power circuit, the circuit board of the power supply and signal converter is equipped with a signal conversion module and a voltage regulator module. It can power the microphone head through the microphone interface and transmit the signal collected by the microphone head to the sound card through the signal conversion module. When the sound card provides a power circuit, the microphone head is directly connected to the sound card through the signal transmission line and the first interface. In this way, the power supply method can be selected according to the application requirements, which is conducive to improving the flexibility and convenience of use.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the structure of the MEMS microphone assembly according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the circuit board of the MEMS microphone assembly according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 The circuit diagram of the voltage regulator module on the circuit board is shown.

[0023] Figure 4 for Figure 2 The circuit diagram of the signal conversion module on the circuit board is shown.

[0024] Figure label:

[0025] Power supply and signal adapter 100, housing 110, circuit board 120, signal adapter module 121, voltage regulator module 122, microphone interface 123, sound card interface 124, power interface 125.

[0026] Microphone head 200, signal transmission line 210, first interface 220. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first," "second," etc., are used in the description, they are only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, the terms "setting", "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in combination with the specific content of the technical solution.

[0030] This embodiment discloses a sound pickup system, including a sound card and a MEMS microphone assembly. Please refer to... Figure 1 and Figure 2 The MEMS microphone assembly includes a power supply and signal adapter 100 and a microphone head 200. The power supply and signal adapter 100 includes a housing 110 and a circuit board 120 disposed within the housing 110. The circuit board 120 is provided with a signal adapter module 121 and a voltage regulator module 122. The input end of the signal adapter module 121 is connected to a microphone interface 123, and the output end of the signal adapter module 121 is connected to a sound card interface 124. The input end of the voltage regulator module 122 is connected to a power interface 125, and the output end of the voltage regulator module 122 is connected to the microphone interface 123. The microphone interface 123 can be disposed on the circuit board 120 or extended outside the circuit board 120 by a wire. An audio acquisition chip is disposed inside the microphone. The microphone head 200 is connected to a signal transmission line 210, and the signal transmission line 210 is connected to a first interface 220 and is plugged into the microphone interface 123 through the first interface 220.

[0031] For sound cards that do not support microphone power supply, the microphone head 200 can be connected to the power supply and signal adapter 100 via the first interface 220, and then connected to the sound card via the sound card interface 124 of the power supply and signal adapter 100. The circuit board 120 of the power supply and signal adapter 100 is equipped with a signal conversion module and a voltage regulator module 122, which can independently power the microphone head 200 and transmit the sound signal collected by the microphone head 200 to the sound card. For sound cards that support microphone power supply, the microphone head 200 can be directly connected to the sound card via the first interface 220, realizing the integration of power supply and signal transmission. In this way, the power supply method can be selected according to application requirements, which is beneficial to improving the flexibility and convenience of use.

[0032] Please refer to Figure 3 The voltage regulator module 122 includes a low-dropout linear regulator chip, such as... Figure 3 As indicated by chip label U601, the input terminal of the low-dropout linear regulator chip is connected to a first filter unit, and the output terminal is connected to a second filter unit. The first filter unit is as follows: Figure 3 As shown in the capacitor marking C601, the second filter unit is as follows: Figure 3 The capacitor is marked C602. The first and second filtering units can filter the current signal, improve the stability of the current signal, thereby improving the working stability of the microphone head 200 and thus improving the quality of sound acquisition.

[0033] Please continue to refer to Figure 3 Low dropout linear regulator chips are equipped with current limiting pins, such as... Figure 3As indicated by the pin marking ILIM inside chip U601, the current-limiting pin is connected to a current-limiting resistor, as shown below. Figure 3 As indicated by resistor R604 within chip U601, this current-limiting resistor sets the maximum output current of the low-dropout linear regulator chip. The low-dropout linear regulator chip has an internal current source, and the output current of this source is proportional to the output current of the chip. Therefore, the output current can be monitored by measuring the voltage at the current-limiting pin. When the input-output voltage difference of the low-dropout linear regulator chip exceeds a preset threshold, the internal foldback protection circuit reduces the current limit to ensure the chip operates within its safe operating range.

[0034] Please continue to refer to Figure 3 Low dropout linear regulator chips are equipped with output control pins, such as... Figure 3 As indicated by the SET symbol, the output control pin is connected to a voltage regulation resistor, such as... Figure 3 Resistors R606, R607, R608, and R609, as indicated, are voltage regulation resistors used to set the output voltage of the low-dropout linear regulator chip. The output control pin also has a filter capacitor connected to it, which is then connected to the reference voltage terminal. The filter capacitor is shown in the image. Figure 3 As indicated by the C603 capacitor, it can reduce output noise and improve power supply rejection ratio, significantly enhancing the noise performance of low dropout linear regulator chips.

[0035] Please continue to refer to Figure 3 Low dropout linear regulator chips are equipped with voltage detection pins, such as... Figure 3 As indicated by pin marking PGFB within chip U601, the output of the low-dropout linear regulator chip is connected to a voltage sampling branch, which in turn connects to the voltage detection pin. The voltage sampling branch includes resistors R601 and R603. The voltage monitoring pin is primarily used for power monitoring and fast startup functionality.

[0036] Please refer to Figure 4 The signal conversion module 121 includes a common-mode and differential-mode filtering unit, which is connected between the microphone interface 123 and the sound card interface 124. The common-mode and differential-mode filtering unit can perform common-mode filtering and differential-mode filtering on the signal acquired by the microphone 200 to reduce noise in the signal and improve signal quality.

[0037] Please continue to refer to Figure 4The common-mode and differential-mode filter unit includes a first resistor, a first capacitor, a second resistor, a second capacitor, and a third capacitor. The first terminal of the first resistor is connected to the first capacitor, and through the first capacitor, it is connected to a reference voltage terminal. The first terminal of the second resistor is connected to the second capacitor, and through the second capacitor, it is connected to the reference voltage terminal. The third capacitor is connected to the first terminal of both the first and second resistors. Specifically, the first resistor is shown as resistor R701 in the figure, the first capacitor as capacitor C701, the second resistor as resistor R702, the second capacitor as capacitor C703, and the third capacitor as capacitor C702. The first resistor and the first capacitor form the first differential-mode suppression branch, the second resistor and the second capacitor form the second differential-mode suppression branch, and the third capacitor serves as a common-mode suppression element, assisting in enhancing the overall filtering effect of both differential and common modes. Figure 4 In the middle, nodes L_MIC_P and L_MIC_N are connected to microphone interfaces 123, and nodes L_ISO_MIC_P and L_ISO_MIC_N are connected to sound card interfaces.

[0038] Please refer to Figure 1 The microphone interface 123 and the power interface 125 are located on the first side of the housing 110, and the sound card interface 124 is located on the second side of the housing 110. The first and second sides of the housing 110 are arranged opposite to each other, making the structure more compact and facilitating wiring.

[0039] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A MEMS microphone assembly, characterized by, include: A power supply and signal converter (100) includes a housing (110) and a circuit board (120) disposed within the housing (110). The circuit board (120) is provided with a signal conversion module (121) and a voltage regulator module (122). The input terminal of the signal conversion module (121) is connected to a microphone interface (123), and the output terminal of the signal conversion module (121) is connected to a sound card interface (124). The input terminal of the voltage regulator module (122) is connected to a power interface (125), and the output terminal of the voltage regulator module (122) is connected to the microphone interface (123). The microphone head (200) is connected to a signal transmission line (210), the signal transmission line (210) is connected to a first interface (220), and is plugged into the microphone head interface (123) through the first interface (220).

2. The MEMS microphone assembly of claim 1, wherein, The voltage regulator module (122) includes a low-dropout linear regulator chip, the input terminal of which is connected to a first filter unit, and the output terminal of which is connected to a second filter unit.

3. The MEMS microphone assembly of claim 2, wherein, The low-dropout linear regulator chip is equipped with a current-limiting pin, which is connected to a current-limiting resistor.

4. The MEMS microphone assembly of claim 2 or 3, wherein, The low dropout linear regulator chip is provided with an output control pin, and the output control pin is connected to a voltage regulation resistor.

5. The MEMS microphone assembly of claim 4, wherein, The output control pin is also connected to a filter capacitor, and is connected to the reference voltage terminal through the filter capacitor.

6. The MEMS microphone assembly of claim 2, 3, or 5, wherein, The low-dropout linear regulator chip is provided with a voltage detection pin, and the output terminal of the low-dropout linear regulator chip is connected to a voltage sampling branch, which is connected to the voltage detection pin.

7. The MEMS microphone assembly of claim 1, wherein, The signal conversion module (121) includes a common-mode and differential-mode filtering unit, which is connected between the microphone interface (123) and the sound card interface (124).

8. The MEMS microphone assembly of claim 7, wherein, The common-mode and differential-mode filter unit includes a first resistor, a first capacitor, a second resistor, a second capacitor, and a third capacitor. The first end of the first resistor is connected to the first capacitor and is connected to a reference voltage terminal through the first capacitor. The first end of the second resistor is connected to the second capacitor and is connected to the reference voltage terminal through the second capacitor. The third capacitor is connected to the first end of the first resistor and the first end of the second resistor.

9. The MEMS microphone assembly according to claim 1, characterized in that, The microphone interface (123) and the power interface (125) are located on the first side of the housing (110), and the sound card interface (124) is located on the second side of the housing (110). The first and second sides of the housing (110) are arranged opposite to each other.

10. A pickup system, characterized in that It includes a sound card and a MEMS microphone assembly as described in any one of claims 1 to 9, wherein the sound card interface (124) of the MEMS microphone assembly is connected to the sound card.

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