Control method and control system using knocking signal

Abstract

The present application discloses a control method for a knocking signal and a control system thereof, the control method comprising: acquiring a signal to be tested, a time-sharing indication signal and an enable signal, the amplitude of the signal to be tested being a function of time; when the time-sharing indication signal and the enable signal are valid, judging whether an impact validity condition is satisfied according to the amplitude of the signal to be tested; when the impact validity condition is satisfied, judging whether an knocking validity condition is satisfied according to the amplitude of the signal to be tested and the corresponding time; and when the knocking validity condition is satisfied, judging whether a single knocking validity condition is satisfied according to the amplitude of the signal to be tested and the corresponding time, and outputting a corresponding control signal according to the accumulated number of times the single knocking validity condition is satisfied, wherein, if the time-sharing indication signal and the enable signal are invalid, or any one of the impact validity condition, the knocking validity condition and the single knocking validity condition is not satisfied, re-acquiring the signal to be tested, the time-sharing indication signal and the enable signal.

Description

Technical Field

[0001] The present disclosure relates to the field of semiconductor device manufacturing, and more particularly, to a control method and a control system thereof using a knocking signal. Background Art

[0002] MEMS stands for Microelectro Mechanical Systems. MEMS sensors are new sensors manufactured using microelectronics and micromachining technology. Compared with traditional sensors, they are small in size, light in weight, low in cost, low in power consumption, high in reliability, suitable for mass production, easy to integrate and intelligent. At the same time, the characteristic size of micrometers enables it to perform functions that traditional mechanical sensors cannot achieve.

[0003] A MEMS accelerometer is a device manufactured using MEMS technology that can detect changes in acceleration.

[0004] For some miniature portable electronic devices, such as Bluetooth headsets and wristband devices, which do not have keyboard input devices like computers or touch screen input devices like mobile phones, simple interactive control can be achieved by defining different tapping methods through built-in accelerometers to detect finger or other similar tapping actions. However, in complex environments or when users make mistakes, the accuracy of such interactive control using tapping methods needs to be improved. Summary of the invention

[0005] In view of this, the present disclosure provides a control method and a control system thereof using a knocking signal, which improves the accuracy of control by setting a variety of judgment conditions to judge the knocking signal.

[0006] According to one aspect of an embodiment of the present disclosure, a control method using a knocking signal is provided, comprising: acquiring a signal to be tested, a time-sharing indication signal, and an enable signal, wherein the amplitude of the signal to be tested is a function of time;

[0007] When the time-sharing indication signal and the enable signal are valid, judging whether the impact validity condition is met according to the amplitude of the signal to be tested;

[0008] When the impact validity condition is met, judging whether the tap validity condition is met according to the amplitude and corresponding time of the signal to be tested; and

[0009] When the tapping validity condition is met, judging whether the single tapping validity condition is met according to the amplitude and corresponding time of the signal to be tested, and outputting a corresponding control signal according to the accumulated number of times the single tapping validity condition is met,

[0010] If the time-sharing indication signal and the enable signal are invalid, or any one of the impact validity condition, the knock validity condition and the single knock validity condition is not satisfied, the signal to be tested, the time-sharing indication signal and the enable signal are re-acquired.

[0011] Optionally, the signal to be tested includes: an X-axis signal to be tested, a Y-axis signal to be tested, and a Z-axis signal to be tested.

[0012] Optionally, judging whether the impact validity condition is met according to the amplitude of the signal to be measured includes:

[0013] Determine whether the amplitude of any single-axis test signal among the X-axis test signal, the Y-axis test signal and the Z-axis test signal exceeds a first knocking threshold, and if not, indicate that the impact state is invalid;

[0014] When the first knock threshold is exceeded, determining whether the amplitude of the single-axis signal to be measured exceeds a second knock threshold, and if not, indicating that the impact state is invalid; and

[0015] When the second knock threshold is exceeded, it is determined whether the signals to be tested of the other two axes exceed the first knock threshold. If not, it indicates that the impact state is invalid.

[0016] When the signals to be tested of the other two axes exceed the first knocking threshold, it indicates that the impact state is valid.

[0017] Optionally, judging whether the tapping validity condition is met according to the amplitude and corresponding time of the signal to be tested includes:

[0018] Obtaining a first time, where the first time represents the time taken for the amplitude of the uniaxial signal to be measured to be less than the first tapping threshold again after exceeding the first tapping threshold; and

[0019] Determine whether the first time is less than a first tapping time threshold, if not, indicating that the tapping is invalid,

[0020] When the first time is less than a first tapping time threshold, it indicates that the tapping is effective.

[0021] Optionally, judging whether a single tap validity condition is met according to the amplitude and corresponding time of the signal to be tested includes:

[0022] Determine whether the amplitude of the single-axis signal to be measured is less than the noise threshold;

[0023] When the amplitude of the signal to be measured of the other two axes is less than the noise threshold, determining whether the amplitude of the signal to be measured of the other two axes is less than the noise threshold;

[0024] Obtaining a fourth time, the fourth time representing the time taken by the single-axis signal to be tested to exceed the noise threshold again after the amplitudes of the X-axis signal to be tested, the Y-axis signal to be tested, and the Z-axis signal to be tested are all less than the noise threshold; and

[0025] It is determined whether the fourth time is greater than a first quiet time threshold. When the fourth time is greater than the first quiet time threshold, it indicates that a single tap detection condition is met.

[0026] Optionally, judging whether the single tap validity condition is met according to the amplitude and corresponding time of the signal to be tested further includes:

[0027] Obtaining a second time, wherein the second time represents the time taken for the amplitude of the uniaxial signal to be measured to be less than the noise threshold again after the amplitude of the uniaxial signal to be measured exceeds the second tapping threshold; and

[0028] A third time is obtained, where the third time represents the time when the amplitude of the single-axis signal to be measured exceeds the noise threshold again after the amplitude of the single-axis signal to be measured is less than the noise threshold.

[0029] Optionally, judging whether the single tap validity condition is met according to the amplitude and corresponding time of the signal to be tested further includes:

[0030] When the single tap detection condition is met, determining whether the waiting time from the last valid single tap is greater than the waiting time threshold;

[0031] When the waiting time is not greater than the waiting time threshold, determining whether the accumulated number of times is greater than the accumulated threshold;

[0032] When the value is not greater than the cumulative threshold, determining whether the tapping is valid;

[0033] When the tapping is valid, determining whether the third time is greater than a second quiet time threshold;

[0034] When the second time is greater than the second quiet time threshold, determining whether the second time is less than a second tapping time threshold;

[0035] When the time is less than the second tapping time threshold, it indicates that the single tapping is valid.

[0036] Optionally, outputting a corresponding control signal according to the accumulated number of times that the single tap validity condition is satisfied includes:

[0037] When the waiting time is greater than the waiting time threshold, outputting a corresponding control signal according to the accumulated number of times; and

[0038] When the accumulated number of times is greater than the accumulated threshold, a corresponding control signal is output according to the accumulated number of times.

[0039] Optionally, the cumulative number represents the number of times a single tap is effective.

[0040] According to another aspect of an embodiment of the present disclosure, a control system is provided, including a control device, wherein the control device uses the control method described above to determine a tapping action on a three-axis acceleration signal and output a control signal.

[0041] Optionally, a communication module is further included, which reads out the result of the tapping action detected by the control device.

[0042] Optionally, a MEMS sensor is also included.

[0043] The signal to be measured includes an acceleration signal output by the MEMS sensor.

[0044] Optionally, it also includes: a multi-way selection circuit, a voltage conversion circuit and an A / D conversion circuit,

[0045] The multiplexing circuit transmits the acceleration signal to the voltage conversion circuit in a time-division multiplexing manner, and outputs a differential signal of an axis in each time period.

[0046] The voltage conversion circuit converts the differential signal into a voltage signal and transmits it to the A / D conversion circuit.

[0047] The A / D conversion circuit converts the differential signal into a digital signal and transmits the digital signal to the control device.

[0048] According to the control method using the knocking signal disclosed in the present invention, by setting the impact effective condition, the knocking effective condition, and the single knocking effective condition, the signal to be tested is gradually judged, and finally the effective knocking signal with a high and short signal characteristic can be accurately identified, thereby accurately identifying the knocking action, and outputting the corresponding control signal according to the identified knocking action. The control method realizes a method for detecting the knocking action in different occasions through different parameter configurations. Through complex state detection, most of the misoperations can be filtered out, so it can be applied to low-power, high-noise equipment. The detected knocking action and state can be read out through a serial communication device as the operation basis of the main system.

[0049] When judging whether the impact state is valid, it is necessary to simultaneously satisfy that the single-axis test signal exceeds the second knock threshold, and the other two-axis signals also exceed the first knock threshold to judge that the impact state is valid, thereby reducing the probability of misjudgment. If only the test signal value of one axis is relatively large, while the data of the other two axes are very small, it may be a noise signal and needs to be filtered out.

[0050] The judgment of the effectiveness of a single tap needs to be made after the detection conditions are met. The detection conditions include that the amplitude of the three-axis test signal is less than the noise threshold, and the interval time for a single axis to exceed the noise threshold again is greater than the preset time. Detecting the quiet state can avoid misoperation. Normal tapping actions will be performed when the device is relatively stable, and will not be performed on a fast-moving device. After detecting that the device has been quiet for a period of time, it enters the formal tapping detection state, further improving the accuracy of detection and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0052] Figure 1 A schematic diagram of the structure of a control system according to an embodiment of the present disclosure is shown.

[0053] Figure 2 The typical waveform of the signal to be tested after high-pass processing in the embodiment of the present disclosure is shown.

[0054] Figure 3 A flow chart of a control method using a knock signal according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0055] The present disclosure will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale. In addition, some well-known parts may not be shown.

[0056] Many specific details of the present disclosure are described below to provide a clearer understanding of the present disclosure. However, as those skilled in the art will appreciate, the present disclosure may be implemented without following these specific details.

[0057] The present disclosure may be embodied in various forms, some examples of which are described below.

[0058] Figure 1 A schematic diagram of the structure of a control system according to an embodiment of the present disclosure is shown.

[0059] like Figure 1 As shown, the control system of the present disclosure includes: a MEMS accelerometer mechanical device 10, a multiplexer circuit 20, a capacitor-voltage conversion circuit 30, an A / D conversion circuit 40, a high-pass digital filter circuit 50, a control device 60 and a serial communication module 70.

[0060] In the present embodiment, the MEMS accelerometer mechanical device 10, specifically referring to a sensing device using semiconductor technology, has three detection axes X, Y and Z, and generates three acceleration signals Ax, Ay, Az, each acceleration signal being linearly related to the acceleration detected along the respective detection axis. In order to reduce the chip area, a differential signal of one axis is selected at each time by a multiplexer circuit 20 in a time-division multiplexing manner. The differential signal is converted into a voltage signal VA by a capacitor voltage conversion circuit 30, a charge amplifier circuit. The voltage signal VA can obtain an acceleration digital signal by passing through an A / D conversion circuit 40. The high-pass digital filter circuit 50 performs high-pass signal processing on the time-division three-axis acceleration digital signal to filter out static signals. The control device 60 performs a knocking action judgment on the high-pass filtered three-axis acceleration signal, detects the knocking action, and outputs the corresponding state result to the serial communication module. Various parameters are set by the serial communication module 70, and the knocking action detection state result can also be read out by the serial communication module 70.

[0061] Figure 2 The typical waveform of the signal to be tested after high-pass processing in the embodiment of the present disclosure is shown.

[0062] like Figure 2 As shown, a normal tap signal is a short and high waveform, not a short and low, or long and high signal. If the second time T2 (hereinafter referred to as T2) is too long, it is a long and high signal. The signal may be positive or negative, and here we unify it into an absolute value. The first time T1 (hereinafter referred to as T1) is the duration of the signal to be tested exceeding the first tap threshold A1. T2 is the duration of the signal to be tested being small enough and lasting long enough after the signal to be tested exceeds the second tap threshold A2, indicating that the device re-enters the quiet state. The second tap threshold A2 must be greater than the first tap threshold A1, and they are all configurable parameters. The specific value depends on the application scenario. A0 is the noise threshold. The waiting time T5 (hereinafter referred to as T5) is the duration between the last effective tap and the next effective tap. The fourth time T4 (hereinafter referred to as T4) is the quiet time timing, and the data of the three axes are all less than the noise threshold A0.

[0063] Figure 3 A flow chart of a control method using a knock signal according to an embodiment of the present disclosure is shown. Figure 2 and Figure 3 The control method using the knocking signal according to the embodiment of the present disclosure is described in detail.

[0064] In step S100 , the control device receives the time-sharing indication signal, the signals to be tested of the three axes XYZ and the enable signals of the three axes according to the preset acquisition frequency.

[0065] In step S200, it is determined whether the time-sharing indication signal is valid and whether the enable signal of at least one axis is valid. If the determination result is no, the process returns to step S100. If the determination result is yes, the process proceeds to step S301 and step S401.

[0066] Step S301 indicates that the control device enters the knock detection state and proceeds to step S302.

[0067] In step S302, it is determined whether the absolute value of the single-axis signal to be tested exceeds the first tapping threshold value A1. If the determination result is no, the process returns to step S100. If the determination result is yes, the process proceeds to step S303 and step S304.

[0068] In step S303, it is determined whether the absolute value of the single-axis input signal exceeds the second tapping threshold value A2. If the determination result is no, the process returns to step S100. If the determination result is yes, the process proceeds to steps S305 and S306.

[0069] In step S304, the timing T1 is performed, wherein the timing is stopped when the amplitude of the signal to be measured is less than the first tapping threshold A1 again.

[0070] In step S305, it is determined whether the absolute values ​​of the other two axis input signals exceed the first tapping threshold value A1. If the determination result is no, the process returns to step S100. If the determination result is yes, indicating that the impact state is valid, the process proceeds to steps S307 and S308.

[0071] In step S306, the timing T2 is performed, wherein the timing is stopped when the amplitude of the signal to be measured is less than the noise threshold A0 again.

[0072] In step S307, it is determined whether T1 is less than the first tapping time threshold. If the determination result is no, the process returns to step S100. If the determination result is yes, indicating that the tapping state is valid, the process proceeds to step S309.

[0073] In step S308, it is recorded that the impact state is valid.

[0074] In step S309, it is recorded that the tapping state is valid.

[0075] Step S401 indicates that the control device enters a single tap detection waiting state, and proceeds to step S402.

[0076] In step S402, it is determined whether the single-axis input signal is less than the noise threshold A0. If the determination result is no, the process returns to step S100. If the determination result is yes, the process proceeds to step S403 and step S404.

[0077] In step S403, it is determined whether the input signals of the other two axes are both less than the noise threshold A0. If the determination result is no, the process proceeds to step 418. If the determination result is yes, the process proceeds to step S405 and step S406.

[0078] In step S404 , a third time T3 (hereinafter referred to as T3 ) is counted, wherein the timing is stopped when the noise threshold A0 is exceeded again.

[0079] In step S405, it is determined whether T4 is greater than the first quiet time threshold, and if the determination result is no, the process returns to step S100. If the determination result is yes, the process proceeds to step S407.

[0080] In step S406 , the timing T4 is performed, wherein the timing is stopped when the amplitude of any one of the signals to be measured in the three axes exceeds the noise threshold A0 again.

[0081] Step S407 indicates that the control device enters into single tap detection and proceeds to step S408.

[0082] In step S408, it is determined whether T5 is greater than the waiting time threshold, wherein the initial value of T5 can be set to 0. If the determination result is yes, the process proceeds to step S416. If the determination result is no, the process proceeds to step S409.

[0083] In step S409, it is determined whether the cumulative number of times satisfying the single tap validity is greater than the cumulative threshold, wherein the initial cumulative number is set to 0, for example. If the determination result is yes, the process proceeds to step S416. If the determination result is no, the process proceeds to step S410.

[0084] In step S410, it is determined whether the recording of the tapping state is valid, if the determination result is no, the process proceeds to step S412. If the determination result is yes, the process proceeds to step S411.

[0085] In step S411, it is determined whether T3 is greater than a second quiet time threshold, wherein the second quiet time threshold is generally set to twice the first quiet time threshold. If the determination result is no, the process returns to step S100. If the determination result is yes, the process proceeds to step S413.

[0086] In step S412, the timer T3 is cleared, and then the process returns to step S100.

[0087] In step S413, it is determined whether T2 is less than the second tapping time threshold. If the determination result is no, the process proceeds to step S417. If the determination result is yes, the process proceeds to steps S414 and S415.

[0088] In step S414, the single-click status is recorded as valid, the number of single-clicks is accumulated, and T5 timing is performed, wherein, when the judgment in step S413 is yes again, the timing is restarted, and then the process returns to step S100.

[0089] In step S415, clear T1 to T4 and single-click and tap valid status records.

[0090] In step S416, a corresponding control signal is output according to the accumulated number of single clicks, and then the process proceeds to step S417.

[0091] In step S417, the timing from T1 to T5 and the state records of impact validity, knock validity and single knock validity are cleared, and then the process returns to step S100.

[0092] In step S418, it is determined whether the impact state of any of the three axes is recorded to be valid. If the determination result is no, the process proceeds to step S419. If the determination result is yes, the process proceeds to step S420.

[0093] In step S419, it is determined whether the single click state of any of the three axes is recorded to be valid. If the determination result is yes, the process proceeds to step S421. If the determination result is no, the process proceeds to step S422 and step S417.

[0094] In step S420, the noise timing is cleared, and then the process returns to step S100.

[0095] In step S421, the single tap valid record is cleared, and then the process returns to step S100.

[0096] In step S422, noise timing is performed, and then the process returns to step S100.

[0097] In the above description, the technical details of the patterning and etching of each layer are not described in detail. However, it should be understood by those skilled in the art that various technical means can be used to form layers, regions, etc. of the desired shape. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above. In addition, although the various embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage.

[0098] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A control method using a knocking signal, characterized in that: include: Acquire a signal to be measured, a time-sharing indication signal and an enable signal, wherein the amplitude of the signal to be measured is a function of time; When the time-sharing indication signal and the enable signal are valid, judging whether the impact validity condition is met according to the amplitude of the signal to be tested; When the impact validity condition is met, judging whether the tap validity condition is met according to the amplitude and corresponding time of the signal to be tested; and When the tapping validity condition is met, judging whether the single tapping validity condition is met according to the amplitude and corresponding time of the signal to be tested, and outputting a corresponding control signal according to the accumulated number of times the single tapping validity condition is met, If the time-sharing indication signal and the enable signal are invalid, or any one of the impact validity condition, the knock validity condition and the single knock validity condition is not satisfied, the signal to be tested, the time-sharing indication signal and the enable signal are reacquired, and the signal to be tested includes: an X-axis signal to be tested, a Y-axis signal to be tested and a Z-axis signal to be tested, Judging whether the impact validity conditions are met based on the amplitude of the signal to be tested include: Determine whether the amplitude of any single-axis test signal among the X-axis test signal, the Y-axis test signal and the Z-axis test signal exceeds a first knocking threshold, and if not, indicate that the impact is invalid; When the first knock threshold is exceeded, determining whether the amplitude of the single-axis signal to be tested exceeds a second knock threshold, and if not, indicating that the impact is invalid; and When the second knock threshold is exceeded, it is determined whether the signals to be tested of the other two axes exceed the first knock threshold. If not, it indicates that the impact is invalid. When the signals to be tested of the other two axes exceed the first knocking threshold, it indicates that the impact is effective. Judging whether the tapping validity condition is met according to the amplitude and corresponding time of the signal to be tested includes: Obtaining a first time, where the first time represents the time taken for the amplitude of the uniaxial signal to be measured to be less than the first tapping threshold again after exceeding the first tapping threshold; and Determine whether the first time is less than a first tapping time threshold, if not, indicating that the tapping is invalid, When the first time is less than the first tapping time threshold, it indicates that the tapping is effective. Judging whether a single tap validity condition is met according to the amplitude and corresponding time of the signal to be tested includes: Determine whether the amplitude of the single-axis signal to be measured is less than a noise threshold; When the amplitude of the signal to be measured of the other two axes is less than the noise threshold, determining whether the amplitude of the signal to be measured of the other two axes is less than the noise threshold; Obtaining a fourth time, the fourth time representing the time taken by the single-axis signal to be tested to exceed the noise threshold again after the amplitudes of the X-axis signal to be tested, the Y-axis signal to be tested, and the Z-axis signal to be tested are all less than the noise threshold; and It is determined whether the fourth time is greater than a first quiet time threshold. When the fourth time is greater than the first quiet time threshold, it indicates that a single tap detection condition is met.

2. The control method according to claim 1, characterized in that: Judging whether the single tap validity condition is met according to the amplitude and corresponding time of the signal to be tested also includes: Obtaining a second time, wherein the second time represents the time taken for the amplitude of the uniaxial signal to be measured to be less than the noise threshold again after the amplitude of the uniaxial signal to be measured exceeds the second tapping threshold; and A third time is obtained, where the third time represents the time when the amplitude of the single-axis signal to be measured exceeds the noise threshold again after the amplitude of the single-axis signal to be measured is less than the noise threshold.

3. The control method according to claim 2, characterized in that: Judging whether the single tap validity condition is met according to the amplitude and corresponding time of the signal to be tested also includes: When the single tap detection condition is met, determining whether the waiting time from the last valid single tap is greater than the waiting time threshold; When the waiting time is not greater than the waiting time threshold, determining whether the accumulated number of times is greater than the accumulated threshold; When the value is not greater than the cumulative threshold, determining whether the tapping is valid; When the tapping is valid, determining whether the third time is greater than a second quiet time threshold; When the second time is greater than the second quiet time threshold, determining whether the second time is less than a second tapping time threshold; When the time is less than the second tapping time threshold, it indicates that the single tapping is valid.

4. The control method according to claim 3, characterized in that: Outputting a corresponding control signal according to the accumulated number of times that the single tapping effective condition is satisfied includes: When the waiting time is greater than the waiting time threshold, outputting a corresponding control signal according to the accumulated number of times; and When the accumulated number of times is greater than the accumulated threshold, a corresponding control signal is output according to the accumulated number of times.

5. The control method according to claim 4, characterized in that: The cumulative number of times represents the number of times a single tap is effective.

6. A control system, comprising a control device, wherein the control device uses the control method according to any one of claims 1 to 5 to determine the tapping action of a three-axis acceleration signal and output a control signal.

7. The control system according to claim 6, characterized in that: It also includes a communication module, which reads out the result of the tapping action detected by the control device.

8. The control system according to claim 7, characterized in that: Also includes MEMS sensors, The signal to be measured includes an acceleration signal output by the MEMS sensor.

9. The control system according to claim 8, characterized in that: Also includes: Multiplexer circuit, voltage conversion circuit and A / D conversion circuit, The multiplexing circuit transmits the acceleration signal to the voltage conversion circuit in a time-division multiplexing manner, and outputs a differential signal of an axis in each time period. The voltage conversion circuit converts the differential signal into a voltage signal and transmits it to the A / D conversion circuit. The A / D conversion circuit converts the differential signal into a digital signal and transmits the digital signal to the control device.

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