Multi-axis sensing device

Abstract

The invention provides a multi-axis sensing device. The multi-axis sensing device comprises a multi-axis sensor, a plurality of frequency mixing modulators, an adder, an SD modulator and a plurality of band-pass filters, wherein the multi-axis sensor is used for sensing induction signals of a plurality of axes. And each frequency mixing modulator performs frequency mixing modulation on the induction signal of the corresponding shaft and the modulation frequency of the frequency mixing modulator to obtain the induction signal of the shaft after frequency mixing modulation. And the adder adds the induction signals of each axis after frequency mixing modulation to obtain a multi-axis mixed induction signal. And the SD modulator modulates the multi-axis hybrid sensing signal to obtain a multi-axis hybrid sensing signal after SD modulation. Each band-pass filter carries out band-pass filtering on the multi-axis mixed induction signal after SD modulation to obtain an induction data stream of the corresponding axis, and the frequency of the induction signal of each axis after frequency mixing modulation is located in a pass band of the corresponding band-pass filter. Thus, processing of the induction signals of the three axes can be achieved without channel switching, and the processing speed is higher.

Description

[Technical field]

[0001] The present invention relates to the field of sensing, and in particular to a multi-axis sensing device. [Background technology]

[0002] like Figure 1 As shown in FIG. , it shows a schematic diagram of the structure of a triaxial accelerometer in the prior art. Figure 1 As shown, the three-axis accelerometer includes a three-axis accelerometer, a SD (Sigma Delta) modulator (SDM) and a low-pass filter. The three-axis accelerometer generates an X-axis sensing signal, a Y-axis sensing signal and a Z-axis sensing signal. The frequency fin_x of the X-axis sensing signal is the signal frequency fb, the frequency fin_y of the Y-axis sensing signal is the signal frequency fb, and the frequency fin_z of the Z-axis sensing signal is the signal frequency fb. In order to save power consumption and area, the sensing signals of the three axes need to share one SD modulator. The sensing signals of the X-axis, Y-axis and Z-axis are connected to the input end of the SD modulator in turn, and switching between different axes also requires a sleep time. The three-axis accelerometer includes a switching switch combination, such as Figure 2 As shown, the switch combination selects to connect one of the X-axis, Y-axis, and Z-axis to the input end of the SD modulator according to the selection signals Sel_x, Sel_y, and Sel_z.

[0003] However, the prior art method of connecting the sensing signals of the X-axis, Y-axis and Z-axis to the SD modulator in turn obviously reduces the data processing speed. Therefore, it is urgent to propose a new technical solution to solve the above problem. [Summary of the invention]

[0004] One of the purposes of the present invention is to provide a multi-axis sensing device which does not require channel switching and only requires one SD modulator to process sensing signals of multiple axes, with a faster processing speed.

[0005] According to one aspect of the present invention, the present invention provides a multi-axis sensing device, which includes: a multi-axis sensor, which senses and obtains sensing signals of multiple axes; multiple mixers, wherein each mixer receives the sensing signal of a corresponding axis and performs mixing and modulation on the sensing signal of the corresponding axis with the modulation frequency of the mixer to obtain the sensing signal of the axis after mixing and modulation, and different mixers have different modulation frequencies; an adder, which receives the sensing signals of each axis after mixing and modulation output by each mixer and modulates the sensing signals of each axis after mixing and modulation to obtain a multi-axis mixed sensing signal; an SD modulator, which receives the multi-axis mixed sensing signal and performs SD modulation to obtain a multi-axis mixed sensing signal after SD modulation; multiple bandpass filters, wherein each bandpass filter performs bandpass filtering on the multi-axis mixed sensing signal after SD modulation to obtain a sensing data stream of the corresponding axis, and the frequency of the sensing signal of each axis after mixing and modulation is located within the passband of the corresponding bandpass filter, and the passbands of each bandpass filter are different.

[0006] Compared with the prior art, the present invention does not require channel switching and only requires one SD modulator to process sensing signals of multiple axes, with a faster processing speed.

Brief Description of the Drawings

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0008] Figure 1 It is a structural schematic diagram of a three-axis accelerometer in the prior art;

[0009] Figure 2 for Figure 1 A timing diagram of the selection signals Sel_x, Sel_y and Sel_z in FIG.

[0010] Figure 3 It is a schematic structural diagram of a multi-axis sensing device in one embodiment of the present invention;

[0011] Figure 4 for Figure 3 Schematic diagram of the working principle of the multi-axis sensing device in. [Specific implementation method]

[0012] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] The "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "coupled" and other terms indicating electrical connection should be understood in a broad sense; for example, it can be a direct electrical connection, or it can be indirectly electrically connected through an intermediate medium, and the intermediate medium can be an electronic component, a functional circuit, etc. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0014] The present invention provides a multi-axis sensing device, which does not require channel switching and only requires one SD modulator to process sensing signals of multiple axes, with a higher processing speed.

[0015] Figure 3 It is a schematic structural diagram of a multi-axis sensing device in one embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the working principle of the multi-axis sensor device in FIG. Figure 3 and 4 As shown, the multi-axis sensing device includes: a multi-axis sensor 310, a plurality of mixer modulators, an adder 330, a SD (Sigma Delta) modulator (SDM) 340 and a plurality of bandpass filters.

[0016] In one embodiment, the multi-axis sensor is a three-axis sensor, which can sense the sensing signals of three axes, and the three axes are respectively X-axis, Y-axis and Z-axis. There are three mixer modulators, which are marked as 320a-320c, and the three mixer modulators 350a-350c correspond to the X-axis, Y-axis and Z-axis respectively. There are three bandpass filters 350a-350c, and the three bandpass filters 350a-350c correspond to the X-axis, Y-axis and Z-axis respectively. The following is an introduction taking three axes as an example.

[0017] Preferably, the multi-axis sensor may be an acceleration sensor. In other embodiments, the multi-axis sensor may also be a magnetic sensor, a gyroscope, etc. The multi-axis may also be two axes, four axes, six axes, etc.

[0018] The multi-axis sensor 310 senses the sensing signals of multiple axes. The frequency of the sensing signal of each axis is fb. Figure 3 and 4 As shown, the frequency of the sensing signal of the X axis is fin_x=fb, the frequency of the sensing signal of the Y axis is fin_y=fb, and the frequency of the sensing signal of the Z axis is fin_z=fb.

[0019] Each mixer modulator receives the sensing signal of a corresponding axis and performs mixing and modulation of the sensing signal of the corresponding axis with the modulation frequency of the mixer modulator to obtain the sensing signal of the axis after mixing and modulation. Different mixer modulators have different modulation frequencies. For example, the modulation frequency of mixer modulator 320a is fm1, the modulation frequency of mixer modulator 320b is fm2, and the modulation frequency of mixer modulator 320b is fm3, and fm1, fm2 and fm3 are not equal to each other and are separated by more than a predetermined frequency.

[0020] like Figure 3 and 4 As shown, the frequency of the induction signal of one axis after mixing modulation is equal to the sum of the modulation frequency of the corresponding mixing modulator and the frequency of the induction signal of this axis. Specifically, the frequency of the induction signal of the X axis after mixing modulation output by the mixing modulator 320a is equal to the sum of the modulation frequency fm1 of the corresponding mixing modulator 320a and the frequency fb of the induction signal of the X axis, that is, fb+fm1; the frequency of the induction signal of the Y axis after mixing modulation output by the mixing modulator 320b is equal to the sum of the modulation frequency fm2 of the corresponding mixing modulator 320b and the frequency fb of the induction signal of the Y axis, that is, fb+fm2; the frequency of the induction signal of the Z axis after mixing modulation output by the mixing modulator 320c is equal to the sum of the modulation frequency fm3 of the corresponding mixing modulator 320c and the frequency fb of the induction signal of the Z axis, that is, fb+fm3. Preferably, the mixing modulator is a sine wave mixing modulator.

[0021] The adder 330 receives the induction signals of each axis after mixing and modulation output by each mixing and modulation modulator and adds the induction signals of each axis after mixing and modulation to obtain a multi-axis mixed induction signal. In this way, the multi-axis mixed induction signal can include the induction signals of multiple axes, and the induction signals of multiple axes are not divided into different frequency bands in the multi-axis mixed induction signal.

[0022] The SD modulator 340 receives the multi-axis mixed sensing signal and performs SD modulation to obtain a multi-axis mixed sensing signal after SD modulation. The SD modulation method of the SD modulator can refer to the prior art, which is not the focus of the present invention and will not be described here.

[0023] Each bandpass filter performs bandpass filtering on the multi-axis mixed sensing signal after SD modulation to obtain the sensing data stream of the corresponding axis. The frequency of the sensing signal of each axis after mixing modulation is within the passband of the corresponding bandpass filter, and the passbands of various bandpass filters are different.

[0024] In one embodiment, the bandpass filter 350a performs bandpass filtering on the multi-axis mixed sensing signal after SD modulation to obtain the sensing data stream of the X axis, and the frequency of the sensing signal of the X axis after the mixing modulation is within the passband of the corresponding bandpass filter 350a; the bandpass filter 350b performs bandpass filtering on the multi-axis mixed sensing signal after SD modulation to obtain the sensing data stream of the Y axis, and the frequency of the sensing signal of the Y axis after the mixing modulation is within the passband of the corresponding bandpass filter 350b; the bandpass filter 350c performs bandpass filtering on the multi-axis mixed sensing signal after SD modulation to obtain the sensing data stream of the Z axis, and the frequency of the sensing signal of the Z axis after the mixing modulation is within the passband of the corresponding bandpass filter 350c. The passbands of the various bandpass filters 350a-350cc are different and correspond to the frequencies of the sensing signals of each axis after the mixing modulation.

[0025] Preferably, the frequency of the induction signal of each axis after frequency mixing and modulation is equal to the center frequency of the corresponding bandpass filter.

[0026] Compared with the prior art, the present invention does not require channel switching, nor does it require sleep time during channel switching. Only one SD modulator is required to process the sensing signals of multiple axes, and the processing speed is faster.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0028] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. A multi-axis sensing device, characterized in that: It includes: A multi-axis sensor that senses signals from multiple axes; A plurality of mixer modulators, each of which receives a sensing signal of a corresponding axis and performs mixing and modulation on the sensing signal of the corresponding axis with a modulation frequency of the mixer modulator to obtain a mixed and modulated sensing signal of the axis, and different mixer modulators have different modulation frequencies; an adder, which receives the induction signals of each axis after mixing and modulation output by each mixing and modulation modulator and adds the induction signals of each axis after mixing and modulation to obtain a multi-axis mixed induction signal; An SD modulator receives the multi-axis mixed sensing signal and performs SD modulation to obtain an SD-modulated multi-axis mixed sensing signal; Multiple bandpass filters, each of which performs bandpass filtering on the multi-axis mixed sensing signal after SD modulation to obtain the sensing data stream of the corresponding axis, the frequency of the sensing signal of each axis after mixing modulation is located within the passband of the corresponding bandpass filter, and the passbands of various bandpass filters are different.

2. The multi-axis sensing device according to claim 1, characterized in that: The multi-axis sensor is a multi-axis acceleration sensor, The multi-axis sensor is a three-axis sensor, which can sense and obtain sensing signals of three axes, wherein the three axes are respectively an X-axis, a Y-axis and a Z-axis. There are three mixer modulators, and the three mixer modulators correspond to three axes respectively. There are three band-pass filters, and the three band-pass filters correspond to three axes respectively.

3. The multi-axis sensing device according to claim 1, characterized in that: The frequency of the induction signal of one axis after the mixing modulation is equal to the sum of the modulation frequency of the corresponding mixing modulator and the frequency of the induction signal of this axis.

4. The multi-axis sensing device according to claim 1, characterized in that: The mixer modulator is a sine wave mixer modulator.

5. The multi-axis sensing device according to claim 1, characterized in that: The frequency of the induced signal of each axis after mixing and modulation is equal to the center frequency of the corresponding bandpass filter.

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