TWI869878B - Electronic device and noise cancellation method thereof - Google Patents

Abstract

An electronic device and a noise cancelation method are provided. The electronic device includes a driver, a driven device and an inertial measurement device. The driver generates a driving signal and generates a noise prediction signal according to the driving signal. The driven device receives the driving signal to perform an operation, wherein when the driven device performing the operation, the driven device generates a vibration noise according to generated vibrations. The inertial measurement device sense a position status of the electronic device to generate sensing information. The inertial measurement device receives the noise prediction signal, and compensates the sensing information according to the noise prediction signal to generate a compensated sensing information.

Description

Electronic device and noise elimination method thereof

The present invention relates to an electronic device and a noise elimination method thereof, and in particular to an electronic device and a noise elimination method thereof capable of improving position sensing accuracy.

With the advancement of electronic technology, electronic products have become important tools in people's lives. In order to enhance the operating experience of electronic devices, today's electronic devices often use the position status of the electronic devices as reference information for the human-machine interface.

Since electronic devices include a variety of components, these components may generate a certain degree of vibration when performing actions. Therefore, when sensing the position state of the electronic device, the vibration noise generated by these vibrations will cause errors in the sensing of the position state. These errors will distort the position tracking action of the electronic device and cause errors and even failure risks in human-machine operations.

The present invention provides an electronic device and a noise elimination method thereof, which can improve the accuracy of position state sensing.

The electronic device of the present invention includes a driver, a driven device and an inertia measurement device. The driver is used to generate a driving signal, and a noise prediction signal is generated according to the driving signal. The driven device is coupled to the driver. The driven device receives the driving signal to perform an action, wherein when the driven device performs the action, vibration noise is generated according to the vibration generated. The inertia measurement device is coupled to the driver. The inertia measurement device is used to sense the position state of the electronic device to generate sensing information. The inertial measurement device receives the noise prediction signal and compensates the sensing information according to the noise prediction signal to generate compensated sensing information.

The noise elimination method of the present invention includes: generating a driving signal, and generating a noise prediction signal according to the driving signal; enabling a driven device to receive the driving signal to perform an action, wherein when the driven device performs the action, vibration noise is generated according to the vibration generated; enabling an inertial measurement device to sense the position state of the electronic device to generate sensing information, and compensating the sensing information according to the noise prediction signal to generate compensated sensing information.

Based on the above, the electronic device of the present invention generates a noise prediction signal according to a driving signal, and compensates for the sensing information corresponding to the position state of the electronic device according to the noise prediction signal, thereby effectively reducing the impact of vibration noise in the sensing information, effectively improving the signal-to-noise ratio of the sensing information, and improving the accuracy of the position sensing of the electronic device.

Please refer to Figure 1, which shows a schematic diagram of an electronic device of an embodiment of the present invention. The electronic device 100 includes a driver 110, a driven device 120, and an inertia measuring device 130. The electronic device 100 can be any portable electronic device. The inertia measuring device 130 is used to measure the position state of the electronic device 100. In this embodiment, the driven device 120 can be any device that generates vibration when in motion, such as a heat dissipation fan, a vibrator, or a speaker. The driver 110 is a driving circuit used to drive the driven device 120.

In the embodiment of the present invention, the driver 110 is coupled to the driven device 120. The driver 110 can generate a driving signal DRV according to actual needs, and provide the driving signal DRV to the driven device 120, so that the driven device 120 can perform actions corresponding to the actual needs. For example, taking the driven device 120 as a heat dissipation fan as an example, the driver 110 can generate a driving signal DRV according to the working state of the electronic device 100, and control the speed of the heat dissipation fan (driven device 120) through the driving signal DRV. When the driven device 120 operates, corresponding vibrations are generated, and vibration noise NS is generated according to the vibrations.

The inertia measuring device 130 is coupled to the driver 110. The inertia measuring device 130 is used to measure the position state of the electronic device 100 and thereby generate sensing information. However, since the driven device 120 will simultaneously generate vibration noise NS, the sensing information generated by the inertia measuring device 130 includes the vibration noise NS in addition to the actual position information of the electronic device 100.

In order to eliminate the vibration noise NS in the sensing information, the driver 110 in the embodiment of the present invention generates a noise prediction signal PNS according to the generated driving signal DRV. The driver 110 also provides the noise prediction signal PNS to the inertial measurement device 130. In this way, the inertial measurement device 130 can compensate the generated sensing information according to the noise prediction signal PNS to generate compensated sensing information. Among them, the component of the vibration noise NS in the compensated sensing information can be greatly reduced, and the signal to noise ratio (SNR) of the compensated sensing information can be effectively improved.

To further explain, in this embodiment, the driver 110 can generate a noise prediction signal PNS according to the strength of the generated driving signal DRV. Again, taking the driven device 120 as a heat dissipation fan as an example, when the strength of the driving signal DRV generated by the driver 110 is stronger, it means that the speed of the heat dissipation fan (driven device 120) will be faster, and the corresponding vibration will be greater, and a larger value of vibration noise NS can be generated. In this way, the driver 110 can provide a corresponding noise prediction signal PNS according to the strength of the driving signal DRV.

In actual application, engineers can conduct experiments in advance on the vibration noise NS that may be generated by the heat dissipation fan (driven device 120) under different strengths of the driving signal DRV, and record it. Through the above-mentioned recorded data, engineers can establish a lookup table information in advance and pre-store the lookup table information in the driver 110. During the operation of the electronic device 100, the driver 110 can generate a noise prediction signal PNS based on the strength of the generated driving signal DRV based on the lookup table information, and provide the noise prediction signal PNS to the inertial measurement device 130, so that the inertial measurement device 130 can perform a compensation action for the sensing signal according to the noise prediction signal PNS.

Please refer to FIG. 2 below, which is a schematic diagram of an electronic device according to another embodiment of the present invention. The electronic device 200 includes a driver 210, a driven device 220, and an inertia measurement device 230. The driver 210 is coupled to the driven device 220 and the inertia measurement device 230. In this embodiment, the driven device 220 can be any device that generates vibration when in motion, such as a heat dissipation fan, a vibrator, or a speaker. The driver 110 is a driving circuit for driving the driven device 220.

The inertial measurement device 230 includes an inertial measurement device driving circuit 231 and an inertial measurement device 232. The inertial measurement device 232 is an inertial measurement unit (IMU) for measuring the position state of the electronic device 200 to generate sensing information SI. The inertial measurement device driving circuit 231 is coupled to the inertial measurement device 232. In this embodiment, the inertial measurement device driving circuit 231 is coupled to the driver 210 and receives the noise prediction signal PNS generated by the driver 210. The inertial measurement device driving circuit 231 generates compensated sensing information CSI by subtracting the noise prediction signal PNS from the sensing information SI. Compared with the sensing information SI, the vibration noise NS in the compensated sensing information CSI can be greatly reduced and can have a relatively high signal-to-noise ratio.

On the other hand, in this embodiment, the driver 210 may have a lookup table 211. The lookup table 211 is used to record a lookup information. The lookup information includes multiple strengths of the drive signal DRV and multiple values of the noise prediction signal PNS corresponding to each other. The lookup table 211 can be implemented using any form of memory device, such as non-volatile memory, dynamic or static random access memory, hard disk drive, optical disk drive or any other form of data storage medium known to those skilled in the art, without any specific limitation.

To explain in detail, taking the driven device 220 as a cooling fan as an example, the search information may have multiple strengths of the driving signal DRV corresponding to the rotation speeds of multiple different cooling fans. For example, the cooling fan speed corresponding to the strength A1 is 1000 rpm (Revolution(s) Per Minute), the cooling fan speed corresponding to the strength A2 is 2000 rpm, ..., and the cooling fan speed corresponding to the strength AN is N*1000 rpm. The search information also has multiple values B1~BN of the noise prediction signal PNS corresponding to the multiple strengths A1~AN. In actual operation, when the intensity of the driving signal DRV generated by the driver 210 is one of A1-AN, the driver 210 may provide the noise prediction signal PNS as one of the corresponding values B1-BN to the inertia measurement device driving circuit 231. When the intensity of the driving signal DRV generated by the driver 210 is between the two (for example, between A1 and A2), the driver 210 may calculate the appropriate value of the noise prediction signal PNS through interpolation calculation according to the intensity between A1 and A2 and the corresponding values B1 and B2 respectively.

In order to cope with the aging of the driven device 220 as the working time increases, the driver 210 can provide a transmission interface so that engineers can update the above search information at any time and improve the accuracy of the noise prediction signal PNS.

Incidentally, in order to further improve the performance of noise elimination of the sensing information of the position state of the electronic device, the driver 210 generates the driving signal DRV through a damping control mechanism. According to the knowledge of those skilled in the art, the driving signal DRV generated by the damping control mechanism can reduce the amplitude of the vibration generated by the driven device 220 and reduce the vibration noise NS that may be generated by the driven device 220. The details of the damping control mechanism in this embodiment can be implemented by any damping control mechanism known to those skilled in the art without any specific limitation.

From the above description, it can be known that in the embodiment of the present invention, the driver 210 can first generate a driving signal DRV through a damping control mechanism, and reduce the vibration noise NS that may be generated by the driven device 220 through the driving signal DRV generated under the damping control mechanism, and first perform a first order noise compensation action. Then, the driver 210 provides a corresponding noise prediction signal PNS to the inertia measurement device 230 based on the provided driving signal DRV and the search information recorded in the lookup table 211. The inertial measurement device 230 can eliminate the vibration noise NS in the sensing information SI according to the noise prediction signal PNS, and perform a second order noise compensation operation. In this way, the signal-to-noise ratio of the compensated sensing information CSI can be greatly improved. The position state of the electronic device 200 can also be accurately detected, effectively improving the working performance of the electronic device 200.

Please refer to FIG. 3, which shows a comparison diagram of the energy of the vibration noise of the electronic device before and after the first-order noise compensation action of the embodiment of the present invention. Among them, waveform 310 represents the energy change curve of the vibration noise before the first-order noise compensation action. Waveform 320 represents the energy change curve of the vibration noise after the first-order noise compensation action. According to waveforms 310 and 320, it can be clearly known that through the damping control mechanism executed in the first-order noise compensation action, the vibration noise generated by the driven device can be effectively suppressed, and correspondingly, the bandwidth of the vibration noise can also be effectively reduced.

Please refer to FIG. 4 below, which is a flow chart of the noise elimination method of the embodiment of the present invention. In step S410, the driver can generate a driving signal, and the driver can generate a noise prediction signal according to the driving signal. In step S420, the driven device can receive the driving signal to perform an action, wherein the driven device can generate vibration noise according to the vibration generated when performing the action. In this embodiment, the driven device can be, for example, a heat dissipation fan, a vibrator or a speaker. In step S430, the inertial measurement device senses the position state of the electronic device to generate sensing information, and the sensing information is compensated according to the noise prediction signal to generate compensated sensing information.

The implementation details of the above steps have been described in detail in the aforementioned embodiments and will not be elaborated here.

In summary, the electronic device of the present invention generates a noise prediction signal corresponding to the intensity of the driving signal when the driver generates a driving signal. Thus, the inertial measurement device can compensate the sensing signal of the position state of the electronic device according to the noise prediction signal, which can effectively improve the signal-to-noise ratio of the sensing information after compensation and accurately obtain the position state of the electronic device.

100, 200: electronic device 110, 210: driver 120, 220: driven device 130, 230: inertial measurement device 211: lookup table 231: inertial measurement device driving circuit 232: inertial measurement device 310, 320: waveform CSI: compensated sensing information DRV: driving signal NS: vibration noise PNS: noise prediction signal S410~S430: steps SI: sensing information

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of an electronic device according to another embodiment of the present invention. FIG. 3 is a diagram showing an energy comparison of vibration noise before and after the first-order noise compensation action of the electronic device according to the embodiment of the present invention. FIG. 4 is a flow chart of a noise elimination method according to the embodiment of the present invention.

100: Electronic device 110: Driver 120: Driven device 130: Inertia measurement device DRV: Drive signal NS: Vibration noise PNS: Noise prediction signal

Claims (12)

An electronic device includes: a driver for generating a driving signal, and generating a noise prediction signal according to the driving signal; a driven device, coupled to the driver, receiving the driving signal to perform an action, wherein when the driven device performs the action, a vibration noise is generated according to the vibration generated; and an inertia measurement device, coupled to the driver, the inertia measurement device is used to sense the position state of the electronic device to generate sensing information, the inertia measurement device receives the noise prediction signal, and compensates the sensing information according to the noise prediction signal to generate compensated sensing information. An electronic device as described in claim 1, wherein the sensing information includes the vibration noise generated by the driven device and the sensing information generated by the position state of the electronic device. An electronic device as described in claim 2, wherein the inertial measurement device eliminates the vibration noise in the sensing information according to the noise prediction signal to obtain the compensated sensing information. The electronic device as described in claim 1, wherein the driver has search information, and the driver generates the noise prediction signal according to the drive signal based on the search information. An electronic device as described in claim 4, wherein the search information comprises multiple strengths of the driving signal and multiple values of the noise prediction signal corresponding to each other. An electronic device as described in claim 1, wherein the driver generates the driving signal through a damping control mechanism. An electronic device as described in claim 1, wherein the inertial measurement device comprises: an inertial measurement device for sensing the position state of the electronic device to generate the sensing information; and an inertial measurement device driving circuit coupled to the driver and the inertial measurement device, receiving the noise prediction signal and the sensing information, and compensating the sensing information according to the noise prediction signal to generate the compensated sensing information. A noise elimination method, applicable to an electronic device, includes: generating a driving signal, and generating a noise prediction signal according to the driving signal; enabling a driven device to receive the driving signal to perform an action, wherein when the driven device performs the action, a vibration noise is generated according to the vibration generated; enabling an inertial measurement device to sense the position state of the electronic device to generate sensing information, and compensating the sensing information according to the noise prediction signal to generate compensated sensing information. A noise elimination method as described in claim 8, wherein the sensing information includes the vibration noise generated by the driven device and the location information of the electronic device. The noise elimination method as described in claim 8, wherein the step of generating the compensated sensing information includes: Enabling the inertial measurement device to eliminate the vibration noise in the sensing information according to the noise prediction signal to obtain the compensated sensing information. The noise elimination method as described in claim 8, wherein the step of generating the noise prediction signal according to the driving signal comprises: Based on a search information, generating the noise prediction signal according to the driving signal, wherein the search information has multiple strengths of the driving signal and multiple values of the noise prediction signal corresponding to each other. The noise elimination method as described in claim 8 further includes: Generating the driving signal through a damping control mechanism.

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