KR200490782Y1 - Acoustic Scanner With MEMS Microphone Array - Google Patents

Abstract

The present invention relates to an acoustic scanner using a MEMS microphone array, and more specifically, a bellows (10) capable of maintaining shape when the external force does not change shape and external force, and the MEMS microphone (20) is a printed circuit board ( A plurality of sound channels 50 mounted on the bellows 10 and spaced apart from each other in the middle of the bellows 10, connecting the sound channels 50, and transmitting a sound signal measured by the MEMS microphone 20. A data array cable (70) and a microphone array (100) having; Data acquisition and transmission that are electrically coupled to one end of the data transmission cable 70 to collect sound signals transmitted by the data transmission cable 70 and transmit them to the data handling unit 300. A board 200; Data handling unit for storing the sound signal transmitted from the Data Acqusition and Transmission board 200 for each channel (Ch), and reproduces the sound signal measured by the listening means (not shown) for each channel It relates to an acoustic scanner using a MEMS microphone array, characterized in that configured to include (300).

Description

Acoustic Scanner With MEMS Microphone Array}

The present invention relates to an acoustic scanner using a MEMS microphone array that can be used for tracking noise generated in a vehicle door trim or a narrow space where an acoustic camera is difficult to access.

Acoustic cameras are advanced measurement equipment for visualizing sound and are new technology equipment required in various fields such as multimedia information communication devices, home appliances, automobiles, and construction. As shown in FIG. 1 of the prior art, Korean Patent No. 10-1213539 (SM Instruments Co., Ltd.) is configured by mounting a plurality of MEMS microphones on a printed circuit board. Disclosed is an acoustic sensing device using a MEMS microphone array, characterized by having two to ten wings extending radially.

Utility Model No. 1998-011911 (a hearing device for checking the abnormality of various equipments) is a conventional speaker consisting of a hearing aid connecting hose having an extension hose, and a listening rod having an extension hose and a sound scope. Insert and fasten the connector formed with the ball tightly, and the one end of the spring is fastened to the front end of the connector, the other end of the spring is fastened with the projection of the poppet, the end of the poppet is to receive the spring and poppet Inserted into the hole, the front end of the wheel extends the guide for supporting the selection lever, the selection lever is installed rotatably connected to the guide by a rotation pin, the selection lever formed a plurality of grooves at the rear end Checking for the normal presence of various devices, characterized in that the tip of the poppet is inserted Post note.

Related Prior Art

Registered Patent 10-0838239 (Patent Holder: SM Instruments Co., Ltd.)

Patent Registration 10-2009-0047507 (Applicant: SM Instruments Co., Ltd.)

The present invention aims to provide an acoustic scanner using a MEMS microphone array that can be used for tracking noise generated in a vehicle door trim or a narrow space where an acoustic camera is difficult to access.

The present invention aims to provide an acoustic scanner using a MEMS microphone array with real-time sound pressure level display, signal correlation calculation between channels, measurement history display, and measurement data storage.

The acoustic scanner using the MEMS microphone array of the present invention has a bellows capable of maintaining shape when the external force is not changed and the MEMS microphone is mounted on a printed circuit board and spaced between the bellows in the middle. A plurality of acoustic channels, a microphone array having a data transmission cable connecting the acoustic channels and transmitting acoustic signals measured by the MEMS microphone;

A data acquisition and transmission board electrically coupled to one end of the data transmission cable to collect sound signals transmitted by the data transmission cable and transmit them to a data handling unit;

It includes a data handling unit for storing the sound signal transmitted from the Data Acqusition and Transmission board for each channel (Ch), and reproduces the sound signal measured by the listening means (not shown) for each channel It is characterized by.

In the present invention, the acoustic channel is a digital or analog MEMS microphone for generating an electrical signal corresponding to the sound in the air, the MEMS microphone is mounted and amplifies the electrical signal generated by the MEMS microphone for data transmission and reception And a frame unit for supporting the printed circuit board and protecting the MEMS microphone.

In the present invention, the frame portion is provided with a microphone hole for transmitting sound in the air to the MEMS microphone and a hollow normal protective frame having a built-in chamber, and the lower portion of the built-in chamber of the protective frame is supported by the protective frame And it is configured to include a lower frame for supporting the printed circuit board from the bottom.

In the present invention, the frame portion includes a hollow cylindrical protective frame having a built-in chamber and a microphone hole for transmitting sound in the air to the MEMS microphone, which is a cylindrical metal bellow called Java, and an external object on the outer circumferential surface of the bellows. It is preferable that the plastic resin hollow tube is extrapolated to block the generation of noise due to interference.

In the present invention, it is preferable that the total length of the microphone array is 0.5 to 2 M, and the number of acoustic channels is 4 to 16 before the data acquisition and transmission board.

In the present invention, the data handling unit includes a real-time sound pressure level display, a measurement history display function, a data storage function, a FFT, a filter setting function, a real-time listening function, a signal correlation calculation between channels, and a measurement data storage function. desirable.

In the present invention, the printed circuit board is a communication means for transmitting and receiving, the first transmission port (TX1) and the first receiving port (RX1) for one connection, the second receiving port (RX2) and the second connection for the other side It is preferable that the transmission port TX2 is provided so that bidirectional sound data transmission and reception are possible.

According to the present invention, there is provided an acoustic scanner using a MEMS microphone array that can be used for tracking noise generated in a vehicle door trim or in a narrow space where an acoustic camera is difficult to access.

According to the present invention, there is provided an acoustic scanner using a MEMS microphone array with real-time sound pressure level display, inter-channel signal correlation calculation, measurement history display, and measurement data storage.

1 is an overall configuration of a sound scanner using a MEMS microphone array according to an embodiment of the present invention.
2 is a configuration diagram of a MEMS microphone array according to an embodiment of the present invention.
Figure 3 is a configuration diagram of the MEMS microphone array according to an embodiment of the present invention (microphone array, PCB protection frame removed)
Figure 4 is a detailed view of the acoustic channel of the MEMS microphone array in accordance with an embodiment of the present invention.
5 is a state diagram using the acoustic scanner using a MEMS microphone array according to an embodiment of the present invention.
Figure 6 is a conceptual diagram of the transmission and reception of sound signals through the data transmission cable of the present invention (printed circuit board transmission, reception port connection state).
7 is a configuration diagram of a printed circuit board.

Hereinafter, a sound scanner using an EMS microphone array according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is an overall configuration of an acoustic scanner using a MEMS microphone array according to an embodiment of the present invention, Figure 2 is a configuration diagram of a MEMS microphone array according to an embodiment of the present invention, Figure 3 according to an embodiment of the present invention MEMS microphone array configuration diagram (microphone array, PCB protection frame removal), Figure 4 is a detailed view of the acoustic channel of the MEMS microphone array according to an embodiment of the present invention, Figure 5 is a MEMS microphone array according to an embodiment of the present invention Figure 6 is a state diagram using the acoustic scanner used, Figure 6 is a conceptual diagram (printed circuit board transmission and reception port connection state) of the sound signal transmission and reception through the data transmission cable of the present invention.

As shown in Figures 1 to 3, the acoustic scanner using the EMS microphone array according to an embodiment of the present invention is a microphone array 100, Data Acquisition (Transmission) and Transmission board 200 and data It is configured to include a handling unit 300.

The bellows 10 of the microphone array 100 can maintain its shape when the external force does not change shape and external force. Each of the acoustic channels 50 is provided with a plurality of MEMS microphones 20 mounted on the printed circuit board 30 and spaced in the middle of the bellows 10. The bellows 10 can be used for the conventional well-known water and sink, etc. Metal rings are continuously coupled to enable the operator to change the shape by hand, even if the external force is removed, even if there are acoustic channels in the middle It has to be rigid enough to overcome its weight and maintain its distorted shape. For example, Java may be similar to Javara, which is connected to a water faucet and holds a nozzle for a sink bowl water jet.

The data transmission cable 70 connects the acoustic channels 50 and transmits the acoustic signal measured by the MEMS microphone 20. The data transmission cable 70 is connected to both sides of each printed circuit board 30.

The data acquisition and transmission board 200 is electrically coupled to one end of the data transmission cable 70 to collect sound signals transmitted by the data transmission cable 70 to collect data. To be sent). For example, the data acquisition and transmission board 200 may be a 100 Mbps LAN for communication and a POE encoder.

The data acquisition and transmission board 200 supplies power to the MEMS microphone 20 and the printed circuit board 30 and the MEMS microphone 20 generates a digital electrical signal in response to the sound. Performs a digital analog converter function, and transmits a signal sampled from the analog signal to the data handling unit 300. That is, it has a signal sampling function.

As shown in FIG. 1, the data handling unit 300 stores an acoustic signal transmitted from a data acquisition and transmission board 200 for each channel Ch, and listens to a listening means (not shown). Reproduce the measured sound signal by channel. In one embodiment of the present invention, the data handling unit 300 is a main function, and includes a real-time data display (SPL dB), a measurement history display function, and a data storage function. Response speed: Within 0.04 seconds. As post processing, it is equipped with measurement history display function, FFT, filter setting function, and real time listening function.

2 to 4, the acoustic channel 50 is equipped with a digital or analog MEMS microphone 20 and an MEMS microphone 20 for generating an electrical signal corresponding to sound in the air. Amplifying the electrical signal generated by the MEMS microphone 20, and a printed circuit board 30 having a communication means for transmitting and receiving data, and a frame portion for supporting the printed circuit board 30 and protects the MEMS microphone 20 40 is comprised. 7 is a detailed configuration diagram of a printed circuit board. In the embodiment, the printed circuit board 30 not only enables bidirectional communication (acoustic data transmission) but also includes an amplifying circuit for amplifying an electric signal generated by the MEMS microphone 20.

2 to 4, the acoustic channel 50 is equipped with a digital or analog MEMS microphone 20 and an MEMS microphone 20 for generating an electrical signal corresponding to sound in the air. Amplifies the electrical signal generated by the MEMS microphone 20 and supports the printed circuit board 30 and the printed circuit board 30, the communication circuit for transmitting and receiving data, and protects the MEMS microphone 20 and printed circuit It includes a cylindrical frame portion 40 in which the substrate 30 and the MEMS microphone 20 are embedded (inside the interior compartment) .

As shown in Fig. 4, the cylindrical frame portion 40 is provided with a microphone hole 41a for transmitting sound in the air to the MEMS microphone 20, and a hollow conventional protective frame 41 having a built-in chamber. And a lower frame 43 that is placed in the lower portion of the built-in chamber of the protective frame 41 and is supported by the protective frame 41 and supports the printed circuit board 30 from the bottom thereof.

In one embodiment, the cylindrical frame portion 40 includes a hollow cylindrical protective frame 41 is provided with a microphone hole 41a for transmitting sound in the air to the MEMS microphone 20 and a built-in chamber, bellows Denoted at 10 is a cylindrical metallic bellows, and a plastic resin hollow tube 80 which blocks noise generation due to interference with external objects is extrapolated to the outer peripheral surface of the bellows 10.

The lower frame 43 is formed in an arc or semicircle shape so that the upper part is flat so that the printed circuit board 30 may be attached and supported, and the lower part is in contact with the inner circumferential surface of the cylindrical protective frame 41. It is preferable to further include an upper frame 45 positioned on the upper portion of the lower frame 43, the upper surface of the upper frame 45 forms an arc or semi-circular shape so as to be in contact with the upper inner peripheral surface of the cylindrical protective frame 41. The upper surface of the upper frame 45 may include an incision as shown in the middle.

1 to 3 and 5, the total length of the microphone array 100 before the data acquisition and transmission board 200 is 0.5 to 2M, and the acoustic channel 50 is provided. It is preferable that the number of these is 4-16 pieces. If the sound camera capable of sound field visibility is less than 0.5M inaccessible, there is no need to use a multichannel sound scanner, and a single channel sound scanner can be inserted and used. If it is more than 2M, shape maintenance using bellows becomes difficult and handling becomes inconvenient. When the number of sound channels is about 0.8 ~ 1.2 M, about 8 (10 ~ 15 cm interval) is easy to locate the noise source. Too narrow, too much data handling makes it difficult to locate noise sources. 1M, 8 channels are most suitable not only in the interior of the vehicle door trim but also in terms of handling noise retention.

The data handling unit 300 includes a real-time sound pressure level display for each channel, a measurement history display function, a data storage function, an FFT, a filter setting function, a real-time listening function, a signal correlation calculation between channels, and a measurement data storage function.

As shown in FIG. 1 and FIG. 6, the printed circuit board 30 is a communication means for transmission and reception, and the first transmission port TX1 and the first reception port RX1 for one connection and the first connection port for the other connection. The second reception port RX2 and the second transmission port TX2 are provided to enable two-way sound data transmission and reception.

With reference to FIG. 1, FIG. 6, the flow of a sound signal is demonstrated. When the data handling unit 300 sends an 8-bit command signal to the RX1 of the data acquisition and transmission board 200, the 8-bit sound data accumulated up to now is received from TX1 of the data acquisition and transmission board 200.

When the data acquisition and transmission board 200 receives command data from the RX1, the data acquisition and transmission board 200 sends sound data to the TX1 and received from the data handling unit 300 to the RX1 of the printed circuit board 30 directly connected using the TX2. Send the immediately previous command. When the command data is received by the RX1, the printed circuit board 30 sends the 8-bit accumulated sound data to TX1 and transmits the immediately previous command data received from RX1 to TX2. The data handling unit 300 receives the data of the eight printed circuit boards 30 once by transmitting one command data.

In an embodiment of the present invention, the microphone has a frequency range of 35k to 10k Hz, an input range of 40 to 115 dB (A), a weight of less than 2 kg, and a length. : 1 m.

Flexible Mic. In order to implement an array, a tube is used to compensate for noise caused by an array, a bellows can be used to maintain a desired shape, and a channel MEMS microphone can be arranged using a bellows. The tube is placed outside to minimize noise generation with the array. In order to reduce the cost of repair management, it is desirable that the Miccrophone can be attached / removed.

Although the present invention has been described with reference to the above-mentioned preferred embodiments, the scope of the present invention is not limited to these embodiments, the scope of the present invention is defined by the claims below and equivalent scope of the present invention It will include various modifications and variations belonging to.

The reference numerals set forth in the claims below are merely to aid the understanding of the invention and do not affect the interpretation of the scope of the claims, and the scope of the claims should not be construed narrowly.

10: possible bellows
20: MEMS microphone
30: printed circuit board
40: cylindrical frame portion
41: protective frame
41a: microphone hole
43: lower frame
50: sound channel
70: data transmission cable
100: microphone array
200: Data Acquisition and Transmission Board
300: data handling unit

Claims (7)

delete delete delete Shape change by external force and bellows 10 capable of maintaining shape when no external force is applied, and MEMS microphone 20 are mounted on the printed circuit board 30 and spaced between the bellows 10 in the middle. A plurality of acoustic channels 50,
A data transmission cable 70 connecting the acoustic channels 50 and transmitting the acoustic signal measured by the MEMS microphone 20;
A microphone array having a;

Data acquisition and transmission that are electrically coupled to one end of the data transmission cable 70 to collect sound signals transmitted by the data transmission cable 70 and transmit them to the data handling unit 300. A board 200;

Data handling unit for storing the sound signal transmitted from the Data Acqusition and Transmission board 200 for each channel (Ch), and reproduces the sound signal measured by the listening means (not shown) for each channel 300;
Consists of including

The acoustic channel 50 is a digital or analog MEMS microphone 20 for generating an electric signal corresponding to sound in the air, and the MEMS microphone 20 is mounted therein and electricity generated by the MEMS microphone 20. A printed circuit board 30 which amplifies a signal and has a communication means for transmitting and receiving data, supports the printed circuit board 30, protects the MEMS microphone 20, protects the MEMS microphone 20, and 20 is configured to include a cylindrical frame portion 40,

Cylindrical frame portion 40,
A hollow normal protective frame 41 provided with a microphone hole 41a for transmitting sound in the air to the MEMS microphone 20 and having a built-in chamber,
A lower frame 43 which is settled in the lower part of the built-in chamber of the protection frame 41 and supported by the protection frame 41 and supports the printed circuit board 30 from the bottom;
It is configured to include,

The cylindrical frame portion 40 includes a hollow cylindrical protective frame 41 is provided with a microphone hole (41a) for transmitting sound in the air to the MEMS microphone 20, the internal chamber is formed,
The bellows 10 is a cylindrical metal bellows,
On the outer circumferential surface of the bellows 10 is characterized in that the plastic resin hollow tube 80 to block the generation of noise due to interference with external objects is extrapolated (external)
Bellows-type MEMS microphone array acoustic scanner with shape change retention.
The method of claim 4, wherein
The total length of the microphone array 100 is 0.5 ~ 2 M before the Data Acquisition and Transmission board 200,
The bellows type MEMS microphone array acoustic scanner with a shape change holding function, characterized in that the number of the acoustic channels (50) is 4 to 16.
The method of claim 4, wherein
The data handling unit 300,
Real-time sound pressure level display, measurement history display function, data storage function, FFT, filter setting function, real-time listening function, signal correlation calculation between channels, and measurement data storage function A bellows type MEMS microphone array acoustic scanner.
The method of claim 4, wherein
The printed circuit board 30 is a communication means for transmission and reception, and the first transmission port TX1 and the first reception port RX1 for one side communication, the second reception port RX2 and the second transmission for the other side communication. A bellows type MEMS microphone array acoustic scanner having a shape change holding function, comprising a port (TX2), capable of transmitting and receiving bidirectional acoustic data.

Images