TW201805923A - Silencer, electronic device and control method of electronic device - Google Patents

Abstract

A silencer for reducing variable frequency noise of an electronic device is provided. The silencer includes a Helmholtz resonator and a piston device connected to the Helmholtz resonator. The piston device changes the resonance volume of the Helmholtz resonator based on a control signal, and the control signal is set based on the variable frequency noise of the electronic device.

Description

Sound reduction device, electronic device, and control method of electronic device

The present invention relates to sound attenuating devices, and more particularly to a sound attenuating device using a Helmholtz resonator.

Fixed frequency silencing techniques using Helmholtz resonators have been widely used in various fields such as air conditioning systems, vacuum cleaners, electric fans, and the like. However, the noise frequency generated by the internal components of an electronic product is usually variable. For example, the noise frequency generated by a fan inside the computer changes as the fan speed changes. Therefore, there is a need for a sound attenuating device that can reduce the frequency of the variable frequency, thereby reducing the frequency noise of the electronic product, thereby improving the user experience of the user.

The present invention provides a sound reduction device for reducing varying frequency noise of an electronic device. The sound attenuating device includes a Helmholtz resonator and a piston device, and the piston device is connected to the Helmholtz resonator. Wherein, the piston device changes the resonance volume of the Helmholtz resonator according to a control signal. The control signal changes according to the fluctuation of the above-mentioned variable frequency noise.

The invention provides an electronic device, wherein the electronic device comprises a a fan device; a sound attenuating device; and a control circuit connecting the fan device and the sound attenuating device. Wherein the sound attenuating device comprises a Helmholtz resonator; and a piston device connected to the Helmholtz resonator. The control circuit controls a fan speed of the fan device according to a temperature value. The control circuit sends a control signal to the piston device according to the fan speed, and controls the piston device to change the resonance volume of the Helmholtz resonator to reduce the variable frequency noise caused by the fan device.

The present invention provides a control method for an electronic device, the method comprising: controlling a fan speed of a fan device according to a temperature value through a control circuit; and controlling a piston device according to the fan speed through the control circuit, thereby changing a sea The resonance volume of the Mholtz resonator.

100, 230, 330‧‧‧ sound reduction devices

101, 231, 331‧‧ Helmholtz resonators

102, 232, 332‧‧ ‧ piston

103, 233, 333‧‧‧ drive

V, V2, V3‧‧‧ resonance volume

N‧‧‧ noise

A‧‧‧ area

L‧‧‧ length

200, 200B, 300‧‧‧ electronic devices

201, 210, 310‧‧‧ fan unit

202, 220, 320‧‧‧ control circuit

211, 311‧‧‧Intake Department

212, 312‧ ‧ venting department

213, 313‧‧‧ fans

400‧‧‧ Flowchart

401-403‧‧‧Steps

1 is a schematic view of a sound attenuating device according to an embodiment of the present invention.

2A is a schematic diagram of an electronic device in accordance with an embodiment of the present invention.

2B is a schematic diagram of an electronic device in accordance with an embodiment of the present invention.

Figure 3 is a schematic diagram of an electronic device in accordance with an embodiment of the present invention.

4 is a flow chart of a control method of an electronic device according to an embodiment of the invention.

The above described objects, features and advantages of the present invention will become more apparent from the description of the appended claims.

1 is a sound reduction device 100 according to an embodiment of the present invention. schematic diagram. The sound attenuating device 100 includes a Helmholtz resonator 101 and a piston device. The above piston device is composed of a piston 102 and a driving device 103. In this embodiment, the piston 102 is movably disposed in the Helmholtz resonator 101, and the driving device 103 can adjust the moving direction and distance of the piston 102 in the Helmholtz resonator 101 according to a control signal. Thereby, the resonance volume V of the Helmholtz resonator 101 is adjusted. The sound absorbing device 100 can change the resonance frequency of the Helmholtz resonator 101 by adjusting the resonance volume V of the Helmholtz resonator 101.

Based on the above operation, when the noise N passes through the sound absorbing device 100, if the frequency of the noise N is the same as the above-described resonance frequency of the Helmholtz resonator 101, the volume of the noise N will be subjected to the Helmholtz resonator 101. The resonance phenomenon is affected and reduced. Therefore, the sound absorbing device 100 can adjust the resonance frequency of the Helmholtz resonator 101 according to the above control signal, thereby reducing the noise having the above resonance frequency.

In some embodiments, the driving device 103 includes a motor, such as a linear motor or a stepping motor, to adjust the position of the piston 102 inside the Helmholtz resonator 101 according to the control signal, but the invention is not limited thereto. this. In some embodiments, the resonant frequency of the Helmholtz resonator 101 can be designed by the following equation (1):

Wherein, the symbol f represents the above-mentioned resonance frequency of the Helmholtz resonator 101; the symbol e represents the speed of sound; the area A represents the neck sectional area of the Helmholtz resonator 101 (as shown in Fig. 1); the length L represents the The equivalent neck length of the Mholtz resonator 101 (as shown in Fig. 1); and the resonance volume V can be transmitted through the above piston device Adjustment.

2A is a schematic diagram of an electronic device 200 in accordance with an embodiment of the present invention. The electronic device 200 includes a fan device 201, a sound attenuating device 100, and a control circuit 202. The control circuit 202 is connected to the noise reduction device 100 and the fan device 201. In some embodiments, control circuit 202 controls fan unit 201 based on a temperature value such that fan unit 201 operates based on a fan speed. The above fan speed causes the fan unit 201 to generate noise including a specific frequency. At this time, the control circuit 202 controls the driving device 103 of the sound absorbing device 100 based on the above-described fan rotation speed, and adjusts the position of the piston 102 in the Helmholtz resonator 101 through the driving device 103, thereby changing the resonance of the Helmholtz resonator 101. Volume V. By adjusting the resonance volume V of the Helmholtz resonator 101, the resonance frequency of the Helmholtz resonator 101 of the noise reduction device 100 is adjusted to be the same as the specific frequency described above, thereby reducing the noise having the specific frequency described above. In some embodiments, the specific frequency noise generated by the fan device 201 refers to a primary or secondary noise frequency that is generated when the fan device 201 itself is installed in the electronic device 200, at a certain speed. This frequency may be related to the configuration of the housing of the fan unit 201 and the blade, and may even be related to the configuration of the electronic device 200. Different fan devices may have different frequency noises. However, when the control circuit 202 controls the fan device 201 to rotate, there is a fixed speed range or a specific number of speed values, and the fan device 201 can be actually operated and recorded by a sound pickup device. Alternatively, or directly connect the fan device 201 to the sound absorbing device 100, and record the resonance volume of the fan device 201 at the different rotational speeds when the Helmholtz resonator 101 can exert the maximum sound reduction effect, thereby obtaining the rotational speed of the fan device 201. Correspondence with the resonance volume of the Helmholtz resonator 101. Between the fan device 201 and the sound attenuating device 100 The manner of setting will be described in the following embodiments.

2B is a schematic diagram of an electronic device 200B in accordance with an embodiment of the present invention. The electronic device 200B includes a fan device 210, a sound attenuating device 230, and a control circuit 220. The fan device 210 includes an air inlet portion 211, an air outlet portion 212, and a fan 213. The sound attenuating device 230 includes a Helmholtz resonator 231 and a piston device including a piston 232 and a driving device 233. In the present embodiment, the gas in the fan unit 210 can flow between the fan unit 210 and the Helmholtz resonator 231. Therefore, the gas flowing between the air inlet portion 211 and the air outlet portion 212 is affected by the resonance phenomenon of the Helmholtz resonator 231.

In this embodiment, the control circuit 220 controls the fan 213 according to a temperature value, causing the fan 213 to operate based on a fan speed. When the fan 213 operates at the above-described fan speed, the fan unit 210 generates noise including a specific frequency. The control circuit 220 transmits a control signal to the driving device 233 based on the fan rotation speed, thereby controlling the piston 232 to change the resonance volume V2 of the Helmholtz resonator 231, so that the resonance frequency of the Helmholtz resonator 231 is the same as the specific frequency described above. . In this case, the volume of the noise generated by the fan device 210 having the above-described specific frequency is lowered by the resonance phenomenon of the Helmholtz resonator 231. Then, when the temperature value changes, the control circuit 220 controls the fan 213 according to the changed temperature value, so that the fan 213 operates at a second fan speed. When the fan 213 operates in the above-described state of the second fan, the fan device 210 generates noise including a second specific frequency. The control circuit 220 transmits a second control signal to the driving device 233 based on the second fan rotation speed, thereby controlling the piston 232 to change the resonance volume V2 of the Helmholtz resonator 231, so that Helmhol The resonant frequency of the resonator 231 is the same as the second specific frequency described above. In this case, the volume of the noise generated by the fan device 210 having the second specific frequency described above is lowered by the resonance phenomenon of the Helmholtz resonator 231.

In another embodiment, the sound attenuating device 230 of the electronic device 200B is disposed adjacent to the fan device 210. The sound attenuating device 230 is not directly connected to the fan device 210, and the neck opening of the Helmholtz resonator 231 is a noise source generated by the fan device 210. Therefore, the noise source generated by the fan unit 210 will be affected by the resonance phenomenon of the Helmholtz resonator 231. In this embodiment, the cooperative relationship between the fan device 210, the sound attenuating device 230, and the control circuit 220 is similar to that of the embodiment of FIG. 2B, and details are not described herein again.

Based on the above operation, the electronic device 200B can control the fan device 210 and the noise reduction device 230 through the control circuit 220, so that the noise reduction device 230 can reduce the noise volume generated by the fan device 210 in accordance with the fan rotation speed of the fan device 210. In some embodiments, the control circuit 220 controls the noise reduction device 230 such that the resonant frequency of the Helmholtz resonator 231 is the same as the frequency of the maximum volume noise generated by the fan device 210, thereby reducing the above-described The volume of the loudness of the maximum volume. In some embodiments, the control circuit 220 can control the sound reduction device 230 according to a lookup table; wherein the content of the lookup table is the resonance volume of the Helmholtz resonator 231 corresponding to the various fan speeds of the fan device 210.

In addition to controlling the sound reduction device 230 according to the lookup table, in another embodiment, the control circuit 220 can also be connected to a sound pickup device (for example, a microphone), and the control circuit 220 is used to analyze the noise received by the sound pickup device, depending on the noise. Continuous noise at maximum volume or sub-volume, thus controlling the sound reduction device 230 The resonance volume of the Mholtz resonator 231 can provide immediate control and noise reduction effects.

In some embodiments, the driving device 233 includes a motor, such as a linear motor or a stepping motor, to adjust the position of the piston 232 inside the Helmholtz resonator 231 according to the control signal of the control circuit 220, but the present invention does not Limited with this. In some embodiments, the control circuit 220 can be a processor, a special application processor, a Platform Controller Hub (PCH), an embedded controller (EC), or a serial input/output control. Serial input/output controller (SIO).

FIG. 3 is a schematic diagram of an electronic device 300 in accordance with an embodiment of the present invention. The electronic device 300 includes a fan device 310, a sound attenuating device 330, and a control circuit 320. The fan device 310 includes an air inlet portion 311, an air outlet portion 312, and a fan 313. The sound attenuating device 330 includes a Helmholtz resonator 331 and a piston device including a piston 332 and a driving device 333. In the present embodiment, the gas in the fan unit 310 can flow between the fan unit 310 and the Helmholtz resonator 331. Therefore, the gas flowing between the air inlet portion 311 and the air outlet portion 312 is affected by the resonance phenomenon of the Helmholtz resonator 331.

In this embodiment, control circuit 320 controls fan 313 based on a temperature value such that fan 313 operates based on a fan speed. When the fan 313 operates at the above-described fan speed, the fan unit 310 generates noise including a specific frequency. The control circuit 320 transmits a control signal to the driving device 333 based on the fan rotation speed, thereby controlling the piston 332 to change the resonance volume V3 of the Helmholtz resonator 331, so that the resonance frequency of the Helmholtz resonator 331 and the above The fixed frequency is the same. In this case, the volume of the noise generated by the fan device 310 having the above-described specific frequency is lowered by the resonance phenomenon of the Helmholtz resonator 331.

When the temperature value changes, the control circuit 320 controls the fan 313 according to the changed temperature value, so that the fan 313 operates at a second fan rotation speed, and controls the sound reduction device 330 according to the second rotation speed, thereby reducing the fan device 310. The noise generated when operating at the second fan speed. The operations performed by the control circuit 320 corresponding to different temperature values may correspond to the operation mechanism of the foregoing control circuit 220, and are not described herein again.

In another embodiment, the sound attenuating device 330 of the electronic device 300 is disposed adjacent to the fan device 310. The sound attenuating device 330 is not directly connected to the fan device 310, and the neck opening of the Helmholtz resonator 331 is a source of noise generated by the fan device 310. Therefore, the noise source generated by the fan unit 310 will be affected by the resonance phenomenon of the Helmholtz resonator 331. In this embodiment, the cooperative relationship between the fan device 310, the sound attenuating device 330, and the control circuit 320 is similar to that of the embodiment of FIG. 3, and details are not described herein again.

Based on the above operation, the electronic device 300 can control the fan device 310 and the noise reduction device 330 through the control circuit 320, so that the noise reduction device 330 can reduce the noise volume generated by the fan device 310 in accordance with the fan rotation speed of the fan device 310. In some embodiments, the control circuit 320 controls the noise reduction device 330 such that the resonant frequency of the Helmholtz resonator 331 is the same as the frequency of the maximum volume noise generated by the fan device 310, thereby reducing the reduction of the fan device 310. The volume of the above-mentioned maximum volume noise. In some embodiments, the control circuit 320 can control the sound reduction device 330 according to a lookup table; wherein the content of the lookup table is wind The resonance volume of the Helmholtz resonator 331 corresponding to each of the fan speeds of the fan device 310.

In addition to controlling the sound-damping device 330 according to the look-up table, in another embodiment, the control circuit 320 can also be connected to a sound-receiving device (for example, a microphone), and the control circuit 320 is used to analyze the noise received by the sound-receiving device. The continuous noise of the maximum volume or the sub-volume, thereby controlling the resonance volume of the Helmholtz resonator 331 in the sound absorbing device 330, provides immediate control and noise reduction effects.

In some embodiments, the driving device 333 includes a motor, such as a linear motor or a stepping motor, to adjust the position of the piston 332 inside the Helmholtz resonator 331 according to the control signal of the control circuit 320, but the present invention does not Limited with this. In some embodiments, control circuit 320 can be a processor, a special application processor, a platform path controller, an embedded controller, or a serial input/output controller.

4 is a flow chart 400 of a method of controlling an electronic device in accordance with an embodiment of the present invention. In step 401, a control circuit controls a fan speed of a fan device based on a temperature value. In step 402, the control circuit controls a piston device in accordance with the fan speed. In step 403, the control circuit changes the resonance volume of a Helmholtz resonator through the piston device.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Attenuation device

101‧‧‧ Helmholtz resonator

102‧‧‧Piston

103‧‧‧ drive

V‧‧‧Resonance volume

N‧‧‧ noise

A‧‧‧ area

L‧‧‧ length

Claims (10)

A sound attenuating device for reducing variable frequency noise of an electronic device, comprising: a Helmholtz resonator; and a piston device connected to the Helmholtz resonator; wherein the piston device changes the signal according to a control signal The resonance volume of the Helmholtz resonator; wherein the control signal changes with the variation of the varying frequency noise. The sound attenuating device of claim 1, wherein the piston device comprises: a piston movably disposed in the Helmholtz resonator; and a driving device connected to the piston; wherein The driving device controls the moving direction and distance of the piston in the Helmholtz resonator according to the control signal. The sound attenuating device of claim 2, wherein the driving device comprises a linear motor or a stepping motor. An electronic device comprising: a fan device; a sound attenuating device; and a control circuit connecting the fan device and the sound attenuating device; wherein the sound attenuating device comprises: a Helmholtz resonator; and a piston device Connecting the Helmholtz resonator; wherein the control circuit controls the fan device according to a temperature value a fan speed; wherein the control circuit sends a control signal to the piston device according to the fan speed, and the piston device is controlled to change the resonance volume of the Helmholtz resonator to reduce the variable frequency noise caused by the fan device. The electronic device of claim 4, wherein the piston device comprises: a piston movably disposed in the Helmholtz resonator; and a driving device connected to the piston; wherein The driving device controls the moving direction and distance of the piston in the Helmholtz resonator according to the control signal. The electronic device of claim 4, wherein the control circuit is a processor, a special application processor, a platform path controller, an embedded controller or a serial input/output controller. The electronic device of claim 5, wherein the driving device comprises a linear motor or a stepping motor. A control method for an electronic device includes: controlling a fan speed of a fan device according to a temperature value through a control circuit; and controlling a piston device according to the fan speed through the control circuit, thereby changing a Helmholtz resonance Resonance volume of the device. The control method of the electronic device of claim 8, wherein the piston device comprises: a piston movably disposed in the Helmholtz resonator; and a driving device connected to the piston; The driving device controls the moving direction and distance of the piston in the Helmholtz resonator according to a control signal of the control circuit. The control method of the electronic device according to claim 8, wherein the control circuit can be a processor, a special application processor, a platform path controller, an embedded controller or a serial input/output. Controller.