Noise detection method

Abstract

A noise detection method includes obtaining a rough area formed by a noise source of a circuit board through a first sound receiving assembly and obtaining a precise area of ​​the noise source in the rough area through a second sound receiving assembly, wherein the range of the precise area is smaller than that of the rough area. The first sound receiving assembly includes a first sound receiving component and a first tube. The first sound receiving component is connected to an end of the first tube. A length between the first sound receiving component and the other end of the first tube is

Description

Noise detection methods This invention relates to a noise detection method, and more particularly to a noise detection method using two radio receivers. Portable electronic devices such as mobile phones, tablets, and laptops have become indispensable electronic products in modern life because they are easy to carry and allow users to handle affairs anytime and anywhere. Taking laptops as an example, the electronic components (such as capacitors) on the circuit board of a laptop will generate sound due to vibration when they operate. When electronic components malfunction or other problems occur, the amplitude of vibration of the electronic components will increase, producing noise. Generally, operators will use a microphone to find the source of noise on the circuit board. However, the current method of finding the noise source cannot quickly and accurately locate the noise source, causing operators to spend a lot of time and only find a rough location of the noise source. Therefore, how to improve the efficiency and accuracy of noise source finding is one of the problems that R&D personnel should solve. The present invention provides a noise detection method to improve the efficiency and accuracy of noise source location. An embodiment of the present invention discloses a noise detection method comprising obtaining a coarse region formed by at least one noise source on a circuit board through a first receiving component, and obtaining a precise region of at least one noise source within the coarse region through a second receiving component, wherein the precise region is smaller than the coarse region. The first receiving component includes a first receiving element and a first tube. The first receiving element is connected to one end of the first tube. The length between the first receiving element and the other end of the first tube is 1 / 4 of the wavelength corresponding to a preset audio frequency of the at least one noise source. The second receiving component includes a second receiving element and a resonator. The resonator includes a resonating cavity and a second tube connected together. The resonating cavity is connected to the second receiving element. The size of the second tube is smaller than the size of the resonating cavity. The length of the resonating cavity and the length of the second tube correspond to the preset audio frequency of the at least one noise source. According to the noise detection method of the above embodiment, since the first sound-receiving component first obtains a rough area formed by the noise source, and then the second sound-receiving component further obtains the precise area of ​​the noise source within the rough area, the precise location of the noise source can be found in just two steps without consuming a lot of time. In this way, the efficiency and accuracy of finding the noise source can be improved. Furthermore, since the length between the first receiver and the other end of the first tube in the first receiver assembly is 1 / 4 of the wavelength corresponding to the preset audio frequency of the noise source, the noise volume can be amplified within the first tube, which is beneficial for the first receiver to pick up sound. Moreover, since the length of the resonating cavity and the length of the second tube in the second receiver assembly correspond to the preset audio frequency of the noise source, the noise volume can be amplified within the resonator, which is beneficial for the second receiver to pick up sound. The above description of the content of this invention and the following description of the embodiments are used to demonstrate and explain the principles of this invention, and to provide a further explanation of the scope of the patent application of this invention. Please refer to Figures 1 to 6. Figure 1 is a perspective view of the first radio receiving component according to an embodiment of the present invention. Figure 2 is an exploded view of the first radio receiving component of Figure 1. Figure 3 is a cross-sectional view of the first radio receiving component of Figure 1. Figure 4 is a perspective view of the second radio receiving component according to an embodiment of the present invention. Figure 5 is an exploded view of the first radio receiving component of Figure 4. Figure 6 is a cross-sectional view of the first radio receiving component of Figure 4. The noise detection method in this embodiment performs noise spectrum analysis on a portable electronic device (not shown), such as a laptop computer, and then uses a first radio receiver 10 and a second radio receiver 20 to detect the location of electronic components (i.e., noise sources, such as capacitors, not shown) that are malfunctioning or have other problems in the portable electronic device. As shown in Figures 1 to 3, in this embodiment, the first microphone assembly 10 includes a first microphone 11, a first tube 12, a first sound-absorbing cotton 13, and a first sealing ring 14. The first microphone 11 is, for example, a microphone and is connected to one end of the first tube 12. Specifically, one end of the first tube 12 has a first assembly port 121 and a first abutment protrusion 122. The first abutment protrusion 122 is close to the first assembly port 121. The first microphone 11 is assembled to the first assembly port 121 and rests against the first abutment protrusion 122. In this embodiment, the length L1 between the first receiver 11 and the other end of the first tube 12 is, for example, 1 / 4 of the wavelength corresponding to a preset audio value of the noise source. The preset audio value refers to the audio value corresponding to the peak volume in noise spectrum analysis. Since electronic components that malfunction or experience other problems may emit louder sounds, the preset audio value further refers to the audio value corresponding to the decibel level of the noise emitted by the noise source. Furthermore, when the noise generated by the noise source passes through the aforementioned length of the first tube 12, the first tube 12 can amplify the noise volume to facilitate sound pickup by the first receiver 11. The other end of the first tube 12 has a first microphone port 123. The first microphone port 123 is positioned close to a portable electronic device so that noise emitted by a noise source can be transmitted through the first microphone port 12 to the first microphone 11 for reception. In this way, a rough area of ​​the noise source can be located on the portable electronic device through the first microphone assembly 10. A first sound-absorbing cotton 13 is fitted onto the first tube 12 and is close to the first microphone port 123. The first sound-absorbing cotton 13 is used to absorb other noise to prevent other noise from being transmitted to the first microphone 11 through the first microphone port 123. The first tube body 12 has a first receiving groove 124. A first sealing ring 14 is located in the first receiving groove 124 and is fitted onto one end of the first microphone 11. The first sealing ring 14 is made of, for example, rubber. By providing the first sealing ring 14, the first microphone 11 can be tightly connected to the first tube body 12. As shown in Figures 4 to 6, in this embodiment, the second microphone assembly 20 includes a second microphone 21, a resonator 22, a second sound-absorbing cotton 23, and a second sealing ring 24. The second microphone 21 is, for example, a microphone. The resonator 22 is, for example, a Helmholtz resonator 22. The resonator 22 includes a resonating cavity 221 and a second tube 222 connected together, and the resonating cavity 221 is connected to the second microphone 21. Specifically, the end of the resonating cavity 221 away from the second tube 222 has a second assembly port 2211 and a second supporting protrusion 2212. The second supporting protrusion 2212 is close to the second assembly port 2211. The second microphone 21 is assembled to the second assembly port 2211 and rests against the second supporting protrusion 2212. The second tube 222 is smaller than the resonant cavity 221, and the ratio of the cross-sectional area of ​​the second tube 222 to the cross-sectional area of ​​the resonant cavity 221 is, for example, less than or equal to 1 / 3, so that the resonator 22 can produce Helmholtz resonance. Furthermore, the length L2 of the resonant cavity 221 and the length L3 of the second tube 222 correspond to the preset audio frequency of the noise source. The second tube 222 has a second microphone port 2221 at one end away from the resonant cavity 221. The second microphone port 2221 is positioned close to the portable electronic device so that noise emitted by the noise source can be transmitted through the second microphone port 222 to the second tube 22 and the resonator 22 for reception by the second microphone 21. When noise from the noise source passes through the resonator 22, the resonator 22 amplifies the noise volume to facilitate pickup by the second microphone 21. Furthermore, the diameter of the second tube 222 is smaller than that of the first tube 12. This allows for a more precise location of the noise source on the portable electronic device via the second microphone assembly 20. The second sound-absorbing cotton 23 is fitted onto the second tube 222 and is located near the second sound-receiving port 2221. More specifically, one side of the second sound-absorbing cotton 23 is flush with, for example, the end of the second tube 222 furthest from the resonance cavity 221. The second sound-absorbing cotton 23 is used to absorb other noise, preventing it from being transmitted from the second sound-receiving port 2221 to the second sound-receiving element 21. The length L4 of the second sound-absorbing cotton 23 is, for example, equal to the length L3 of the second tube 222. The resonating cavity 221 has a second receiving groove 2213. A second sealing ring 24 is located in the second receiving groove 2213 and is fitted onto one end of the second microphone 21. The material of the second sealing ring 24 is, for example, rubber. By providing the second sealing ring 24, the second microphone 21 can be tightly connected to the resonating cavity 221. Please refer to Figures 7 to 12. Figure 7 is a top view schematic diagram of locating the noise source of the circuit board through the first microphone assembly of Figure 1. Figure 8 is another top view schematic diagram of locating the noise source of the circuit board through the first microphone assembly of Figure 1. Figure 9 is a cross-sectional schematic diagram of locating the noise source of the circuit board through the first microphone assembly of Figure 1. Figure 10 is a top view schematic diagram of locating the noise source of the circuit board through the second microphone assembly of Figure 4. Figure 11 is a cross-sectional schematic diagram of locating the noise source of the circuit board through the second microphone assembly of Figure 4. Figure 12 is a flowchart illustrating the noise detection method according to an embodiment of the present invention. The noise detection method of this embodiment includes the following steps. First, as shown in step S101 of FIG12, a noise spectrum analysis is performed on a circuit board 30 of a portable electronic device (not shown) so that the operator can find the preset audio corresponding to the decibel level of the noise emitted by the noise source 31 from the noise spectrum analysis. Next, as shown in step S102 of Figures 7 to 9 and Figure 12, a rough area formed by the noise source 31 of the circuit board 30 is obtained through the first microphone assembly 10. Specifically, the operator places the first microphone assembly 10 on the circuit board 30 to locate the noise source 31, so that the noise emitted by the noise source 31 is transmitted through the first microphone port 123 to the first tube 12 for reception by the first microphone element 11. In this way, a rough area formed by the noise source 31 can be located. The operator selects a first tube 12 with a length L1 that is 1 / 4 of the wavelength corresponding to the preset audio frequency, based on a preset audio frequency. The wavelength corresponding to the preset audio frequency can be determined by the speed of sound divided by the preset audio frequency. The speed of sound at room temperature is, for example, 343 meters per second. Next, as shown in step S103 of Figures 10, 11, and 12, a precise area of ​​the noise source 31 is obtained within the approximate area using the second microphone assembly 20, and the precise area is smaller than the approximate area. Specifically, the operator places the second microphone assembly 20 within the approximate area to further locate the noise source 31, allowing the noise emitted by the noise source 31 to be transmitted through the second microphone port 2221 to the second tube 222 and resonator 22 for reception by the second microphone assembly 21. In this way, the precise area formed by the noise source 31 can be located. The operator selects the corresponding length of the resonance cavity 221 and the second tube 222 based on a preset audio frequency. Furthermore, the preset audio frequency (f), sound velocity (c), pi (π), cross-sectional area (A) of the second tube 222, volume (V) of the resonance cavity 221, and tube length (L) of the second tube 222 satisfy the following condition: f = (c / 2π). . In this embodiment, since the first sound receiving component 10 is used to roughly obtain the approximate area formed by the noise source 31, and then the second sound receiving component 20 is used to further obtain the precise area of ​​the noise source 31 within the approximate area, the precise location of the noise source 31 can be found in just two steps without spending a lot of time. In this way, the efficiency and accuracy of finding the noise source 31 can be improved. Furthermore, since the length L1 between the first receiver 11 and the other end of the first tube 12 in the first receiver assembly 10 is 1 / 4 of the wavelength corresponding to the preset audio frequency of the noise source 31, the noise volume can be amplified within the first tube 12, which is beneficial for the first receiver 11 to pick up sound. Moreover, since the length L2 of the resonance cavity 221 and the length L3 of the second tube 222 in the second receiver assembly 20 correspond to the preset audio frequency of the noise source 31, the noise volume can be amplified within the resonator 22, which is beneficial for the second receiver 21 to pick up sound. In this embodiment, the number of noise sources 31 is only one, but it is not limited to this. In other embodiments, the number of noise sources may also be multiple. In this embodiment, the length L4 of the second sound-absorbing cotton 23 is equal to the length L3 of the second tube 222, but it is not limited to this. In other embodiments, the length of the second sound-absorbing cotton may also be less than the length of the second tube, as long as the second sound-absorbing cotton is close to the second sound-receiving port. According to the noise detection method of the above embodiment, since the first sound-receiving component first obtains a rough area formed by the noise source, and then the second sound-receiving component further obtains the precise area of ​​the noise source within the rough area, the precise location of the noise source can be found in just two steps without consuming a lot of time. In this way, the efficiency and accuracy of finding the noise source can be improved. Furthermore, since the length between the first receiver and the other end of the first tube in the first receiver assembly is 1 / 4 of the wavelength corresponding to the preset audio frequency of the noise source, the noise volume can be amplified within the first tube, which is beneficial for the first receiver to pick up sound. Moreover, since the length of the resonating cavity and the length of the second tube in the second receiver assembly correspond to the preset audio frequency of the noise source, the noise volume can be amplified within the resonator, which is beneficial for the second receiver to pick up sound. Although the present invention has been disclosed above with reference to the foregoing embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be determined by the claims attached to this specification. 10: First receiver assembly; 11: First receiver element; 12: First tube body; 121: First assembly port; 122: First support protrusion; 123: First receiver port; 124: First receiving groove; 13: First sound-absorbing cotton; 14: First sealing ring; 20: Second receiver assembly; 21: Second receiver element; 22: Resonator; 221: Resonance cavity; 2211: Second assembly port; 2212: Second support protrusion; 2213: Second receiving groove; 222: Second tube body; 2221: Second receiver port; 23: Second sound-absorbing cotton; 24: Second sealing ring; 30: Circuit board; 31: Noise source L1~L4; Length S101~S103; Steps Figure 1 is a perspective view of the first microphone assembly according to an embodiment of the present invention. Figure 2 is an exploded view of the first microphone assembly of Figure 1. Figure 3 is a cross-sectional view of the first microphone assembly of Figure 1. Figure 4 is a perspective view of the second microphone assembly according to an embodiment of the present invention. Figure 5 is an exploded view of the first microphone assembly of Figure 4. Figure 6 is a cross-sectional view of the first microphone assembly of Figure 4. Figure 7 is a top view of locating a noise source on a circuit board using the first microphone assembly of Figure 1. Figure 8 is another top view of locating a noise source on a circuit board using the first microphone assembly of Figure 1. Figure 9 is a cross-sectional view of locating a noise source on a circuit board using the first microphone assembly of Figure 1. Figure 10 is a top view of locating a noise source on a circuit board using the second microphone assembly of Figure 4. Figure 11 is a cross-sectional view of locating a noise source on a circuit board using the second microphone assembly of Figure 4. Figure 12 is a flowchart of the noise detection method according to an embodiment of the present invention. S101~S103: Steps

Claims

1. A noise detection method includes: obtaining a coarse area formed by at least one noise source of a circuit board through a first sound-receiving component, the first sound-receiving component including a first sound-receiving element and a first tube, the first sound-receiving element being connected to one end of the first tube, and the length between the first sound-receiving element and the other end of the first tube being 1 / 4 of the wavelength corresponding to a preset audio value of the at least one noise source; and obtaining a precise area of ​​the at least one noise source within the coarse area through a second sound-receiving component, the precise area being smaller than the coarse area, the second sound-receiving component including a second sound-receiving element and a resonator, the resonator including a resonating cavity and a second tube connected together, the resonating cavity being connected to the second sound-receiving element, the size of the second tube being smaller than the size of the resonating cavity, and the length of the resonating cavity and the length of the second tube corresponding to the preset audio value of the at least one noise source. The noise detection method as described in claim 1 further includes, before the step of finding the approximate area formed by the at least one noise source on the circuit board through the first sound receiving component: performing a noise spectrum analysis on the circuit board, wherein the preset audio is the audio corresponding to the peak volume in the noise spectrum analysis. The noise detection method as described in claim 2, wherein based on the preset audio frequency (f), sound velocity (c), a mathematical constant pi (π) of the at least one noise source, the cross-sectional area (A) of the second tube, the volume (V) of the resonance cavity, and the tube length (L) of the second tube, the following condition is satisfied: f = (c / 2π) 。 The noise detection method as described in claim 1, wherein the first sound-receiving component further includes a first sound-absorbing cotton, which is fitted onto the first tube. The noise detection method as described in claim 4, wherein the second sound-receiving component further includes a second sound-absorbing cotton, which is fitted onto the second tube. The noise detection method as described in claim 1, wherein the first tube has a first supporting protrusion, and the first receiver rests against the first supporting protrusion. The noise detection method as described in claim 5, wherein the first tube body further comprises a first receiving groove, and the first microphone assembly further comprises a first sealing ring, the first sealing ring being located in the first receiving groove and fitted onto one end of the first microphone assembly. The noise detection method as described in claim 6, wherein the resonating cavity has a second supporting protrusion, and the second receiver rests against the second supporting protrusion. The noise detection method as described in claim 7, wherein the resonant cavity further comprises a second receiving groove, and the second sound receiving component further comprises a second sealing ring located in the second receiving groove and fitted onto one end of the second sound receiving component. The noise detection method as described in claim 1, wherein the ratio of the cross-sectional area of ​​the second tube to the cross-sectional area of ​​the resonant cavity is less than or equal to 1 / 3.

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