WO2020150973A1

WO2020150973A1 - Signal adjustment method, device, chip, apparatus and storage medium

Info

Publication number: WO2020150973A1
Application number: PCT/CN2019/073024
Authority: WO
Inventors: 刘畅
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-01-24
Filing date: 2019-01-24
Publication date: 2020-07-30
Also published as: CN109863703A; CN109863703B

Abstract

Provided are a signal adjustment method, device, chip, apparatus and storage medium, wherein the method includes: acquiring a first background light signal (101); if the intensity of the first background light signal is greater than a first preset threshold, automatically adjusting the amplifier gain to adjust the intensity of the first background light signal such that the intensity of the adjusted first background light signal is less than or equal to the first preset threshold, to obtain a second background light signal (102); acquiring a mixed light signal, and obtaining the target light signal that is the light signal emitted by the light transmitter and received by the light receiver after passing through the human body, according to the mixed light signal and the first background light signal or the second background light signal (103), if the intensity of the target light signal is less than a second preset threshold, automatically adjusting the drive current that is the current that drives the light transmitter to emit light signals, such that the intensity of the target light signal is greater than or equal to the second preset threshold (104), and thus the entire automatic adjustment of the light signal is realized to thereby improve the convenience of the detection and the accuracy of the detection results.

Description

Signal conditioning method, device, chip, equipment and storage medium

Technical field

This application relates to the technical field of smart devices, and in particular to a signal adjustment method, device, chip, device, and storage medium.

Background technique

With the development of smart devices, smart devices have more and more functions. In order to detect the health of the human body, sensors in smart devices (such as wearable devices) can be used (for example, close to the human body, above the human body, or Sensors located close to the outer body surface of the human body in other ways) to detect. Wearable devices can not only monitor the health of the wearer's body for a long time, but also allow the wearer to perform normal daily activities, travel, commute or participate in other activities. The health status of the human body monitored by such a wearable device may include heart rate, blood oxygenation, activity level, blood pressure, galvanic skin response, or other information about the wearer's body.

In the prior art, the use of wearable devices to detect the state of the wearer’s human body is usually through photoelectric detection to detect the human heart rate, for example. The light emitter in the wearable device emits light of a specific wavelength and is incident on the skin tissue. After the reflection, scattering and absorption of the skin tissue, a part of the light can be emitted from the skin surface and received by the light receiver in the wearable device. During this process, the blood volume of the subcutaneous tissue changes with the heart rhythm. The light intensity received by the receiver also changes pulsatingly. By converting the light intensity signal received by the light receiver into an electrical signal, a photoplethysmor graph (PPG) of the blood volume of the subcutaneous tissue changing with the pulse can be obtained, and the heart rate value can be calculated from this.

However, in the prior art, in the process of wearable devices detecting human health status, due to the variety of application environments and changes in wearing caused by sports, the intensity of the light signal received by the optical receiver will vary widely, which will affect the detection. result.

Summary of the invention

The present application provides a signal adjustment method, device, equipment, chip, and storage medium, which realize the full-process automatic adjustment of optical signals, thereby improving the convenience of detection and the accuracy of detection results.

In the first aspect, this application provides a signal adjustment method, including:

Acquire the first background light signal; if the intensity of the first background light signal is greater than the first preset threshold, the amplifier gain is automatically adjusted to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is less than Or equal to the first preset threshold to obtain the second background light signal.

Obtain a mixed optical signal, obtain a target optical signal according to the mixed optical signal, and the first background light signal or the second background light signal, the target optical signal is the optical signal emitted by the optical transmitter and received by the optical receiver after passing through the human body; If the intensity of the target light signal is less than the second preset threshold, the driving current is automatically adjusted. The driving current is the current for driving the light emitter to emit the light signal, so that the intensity of the target light signal is greater than or equal to the second preset threshold.

In this solution, first, if the intensity of the first background light signal is greater than the first preset threshold, the amplifier gain is automatically adjusted so that the intensity of the adjusted first background light signal is less than or equal to the first preset threshold to obtain the second background The light signal ensures that the intensity of the second background light signal is within a reasonable range. Then, the target light signal is acquired, and when the intensity of the target light signal is less than the second preset threshold, the driving current is automatically adjusted to perform the target light signal. The adjustment ensures that the intensity of the target optical signal is within a reasonable range, and realizes the automatic adjustment of the optical signal, thereby improving the convenience of detection and the accuracy of the detection result.

Optionally, after acquiring the first background light signal, the method further includes:

If the intensity of the first background light signal is less than the third preset threshold, the amplifier gain is automatically adjusted to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is greater than or equal to the third preset threshold , And less than or equal to the first preset threshold, to obtain the second background light signal.

In this solution, the amplifier gain is automatically adjusted when the intensity of the first background light signal is less than the third preset threshold, thereby ensuring that the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first preset threshold. Set the threshold.

Optionally, after obtaining the target light signal according to the mixed light signal and the first background light signal or the second background light signal, the method further includes:

If the intensity of the first background light signal or the second background light signal is less than the third preset threshold, and the intensity of the target light signal is less than the third preset threshold, the amplifier gain is automatically adjusted to make the adjusted first background light signal Or the intensity of the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first preset threshold.

In this solution, by automatically adjusting the amplifier gain when the intensity of the second background light signal is less than the third preset threshold and the intensity of the target light signal is less than the third preset threshold, it not only ensures that the intensity of the second background light signal is greater than or equal to The third preset threshold is less than or equal to the first preset threshold, and the target optical signal is adjusted by automatically adjusting the amplifier gain, effectively saving power consumption.

Optionally, the signal adjustment method provided in the embodiment of the present application further includes:

If the intensity of the target optical signal is greater than or equal to the second preset threshold, and the intensity of the mixed optical signal is greater than or equal to the fourth preset threshold, the driving current is automatically adjusted so that the intensity of the mixed optical signal is less than the fourth preset threshold.

In this solution, by considering the intensity of the mixed optical signal when the intensity of the target optical signal is greater than or equal to the second preset threshold, and by adjusting the drive current to ensure that the intensity of the mixed optical signal is less than the fourth preset threshold, the The signal strength is too strong to accurately analyze the target light signal, which leads to the problem of inaccurate detection results.

The following will introduce signal conditioning devices, chips, equipment, storage media, and computer program products. The effects can be referred to the effects of the method part, which will not be repeated below.

In a second aspect, the present application provides a signal conditioning device, including:

The first acquisition module is used to acquire the first background light signal.

The first adjustment module is configured to automatically adjust the amplifier gain if the intensity of the first background light signal is greater than the first preset threshold to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is less than Or equal to the first preset threshold to obtain the second background light signal.

The second acquisition module is used to acquire the mixed optical signal, and obtain the target optical signal according to the mixed optical signal, and the first background light signal or the second background light signal. The target optical signal is the optical signal emitted by the light emitter after passing through the human body. The optical signal received by the receiver.

The second adjustment module is used to automatically adjust the driving current if the intensity of the target light signal is less than the second preset threshold. The driving current is the current that drives the light emitter to emit the light signal, so that the intensity of the target light signal is greater than or equal to the first 2. Preset threshold.

Optionally, the signal conditioning device provided in this application further includes:

The third adjustment module, if the intensity of the first background light signal is less than the third preset threshold, automatically adjusts the amplifier gain to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is greater than or equal to The third preset threshold is less than or equal to the first preset threshold to obtain the second background light signal.

The fourth adjustment module is configured to automatically adjust the amplifier gain if the intensity of the first background light signal or the second background light signal is less than the third preset threshold, and the intensity of the target light signal is less than the third preset threshold, so as to adjust The intensity of the subsequent first background light signal or the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first preset threshold.

The fifth adjustment module is configured to automatically adjust the driving current if the intensity of the target optical signal is greater than or equal to the second preset threshold and the intensity of the mixed optical signal is greater than or equal to the fourth preset threshold to make the intensity of the mixed optical signal Less than the fourth preset threshold.

In the third aspect, this application provides a chip, including:

An amplifier, a driver, and the above-mentioned second aspect or an optional signal conditioning device of the second aspect, wherein the amplifier is used to amplify the optical signal received by the optical receiver; the driver is used to drive the optical transmitter to emit the optical signal.

Optionally, the chip provided in this application also includes:

The analog-to-digital converter and the digital-to-analog converter are used to convert the analog signal sent by the amplifier to a digital signal; the digital-to-analog converter is used to convert the digital signal sent by the signal conditioning device to an analog signal.

In a fourth aspect, this application provides a device including: a processor and a memory,

The memory is used to store computer-executable instructions, so that the processor executes the instructions to implement the signal conditioning method as in the first aspect or an optional manner in the first aspect.

In a fifth aspect, the present application provides a computer storage medium. The storage medium includes computer instructions. When the instructions are executed by a computer, the computer realizes the signal adjustment method as in the first aspect or an optional manner in the first aspect.

In a sixth aspect, the present application provides a computer program product, including computer instructions, which when executed by a computer, cause the computer to implement the first aspect or the signal conditioning method in the first aspect.

The present application provides a signal adjustment method, device, chip, equipment and storage medium. The method includes: acquiring a first background light signal, and if the intensity of the first background light signal is greater than a first preset threshold, automatically adjusting the amplifier gain, Adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is less than or equal to the first preset threshold to obtain the second background light signal; obtain the mixed light signal, according to the mixed light signal and the first The background light signal or the second background light signal obtains the target light signal. The target light signal is the light signal received by the light receiver after the light signal emitted by the light transmitter passes through the human body; if the intensity of the target light signal is less than the second preset threshold, Then, the driving current is automatically adjusted, and the driving current is the current that drives the light emitter to emit the light signal, so that the intensity of the target light signal is greater than or equal to the second preset threshold. Because firstly, if the intensity of the first background light signal is greater than the first preset threshold, the amplifier gain is automatically adjusted so that the intensity of the adjusted first background light signal is less than or equal to the first preset threshold to obtain the second background light signal, Ensure that the intensity of the second background light signal is within a reasonable range, and then obtain the target light signal, and when the intensity of the target light signal is less than the second preset threshold, automatically adjust the drive current to adjust the target light signal to ensure that the target light signal The intensity of the signal is within a reasonable range, which realizes the automatic adjustment of the optical signal, thereby improving the accuracy of the detection result.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings may be obtained based on these drawings without creative labor.

Figure 1 is an exemplary application scenario diagram of the technical solution of the present application;

FIG. 2 is a flowchart of a signal adjustment method provided by an embodiment of the present application;

FIG. 3 is a flowchart of a signal adjustment method provided by another embodiment of the present application;

4 is a flowchart of a signal adjustment method provided by another embodiment of the present application;

Fig. 5 is a schematic structural diagram of a signal conditioning device provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a signal conditioning device provided by another embodiment of the present application;

FIG. 7 is a schematic structural diagram of a signal conditioning device provided by another embodiment of the present application;

FIG. 8 is a schematic diagram of a chip provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of a chip provided by another embodiment of the present application;

Fig. 10 is a schematic diagram of a terminal device provided by an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein, for example, can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

With the development of smart devices, smart devices have more and more functions. In order to detect the health of the human body, sensors in smart devices (such as wearable devices) can be used (for example, approaching, on top or in other ways). Sensors located close to the external body surface of the human body) to detect. Wearable devices are not only convenient to wear, but also can detect a variety of human health data at any time. At present, the use of wearable devices to detect certain health data of the wearer can be achieved through photoelectric detection, which emits a certain wavelength according to the light emitter in the wearable device The signal light reaches the wearer or the object to be detected, and receives the signal light through the light receiver, and then analyzes the signal light received by the light receiver to determine the characteristics of the wearer or the object to be detected. However, due to the diversity and movement of the application environment The resulting change in wearing will affect the intensity of the signal light received by the optical receiver, thereby causing inaccurate detection results. In order to solve the above-mentioned problems, this application proposes a signal conditioning method, device, equipment, and storage medium.

Hereinafter, an exemplary application scenario of the embodiment of the present application will be introduced.

In the application of heart rate detection, the embodiment of the present invention can be applied to the heart rate detection chip. FIG. 1 is an exemplary application scenario diagram of the technical solution of the present application. As shown in FIG. 1, the light emitting diode 11 in the heart rate detection chip emits light. Light of a certain wavelength is incident on the skin tissue 13. Among them, there can be one or more light-emitting diodes 11, and different light-emitting diodes 11 can be driven by one or more drivers in the heart rate detection chip. The control module is connected, the dynamic control module can control the driving current of the driver, and different light emitting diodes 11 can also emit light of different wavelengths, which is not limited in the embodiment of the present invention. After the light emitted by one or more light-emitting diodes 11 is reflected, scattered and absorbed by the skin tissue 13, a part of the light can be emitted from the surface of the skin tissue 13 and received by the photodiode 12 of the heart rate detection chip. The photodiode 12 can One or more different photodiodes 12 can be amplified by one or more amplifiers. The signal light amplified by the amplifier can be sent to the dynamic control module or directly to the dynamic control module after being amplified by the amplifier. The module can control the amplifier gain. During this process, since the blood volume of the skin tissue 13 changes pulsatically with the heart rhythm, the intensity of the signal light received by the photodiode 12 also changes pulsatically. After analyzing the light intensity received by the photodiode 12, the heart rate value is calculated. However, while the photodiode 12 receives the light emitted by the light-emitting diode 11, it also receives the background light signal 14 from the environment. However, changes in wearing due to changes in the environment and sports will affect the signal light intensity received by the photodiode 12, resulting in The heart rate detection result is not accurate, so it is necessary to adjust the signal light intensity.

Based on the above application scenarios, the technical solution of this application is described in detail below:

Figure 2 is a flow chart of a signal conditioning method provided by an embodiment of the present application, where the method can be executed by a signal conditioning device, which can be implemented by software and/or hardware, for example: the device can be part of a terminal device Or all, the terminal device can be a wearable device, such as a heart rate bracelet, a heart rate headset, etc., or a medical device, fitness equipment, etc. The device can also be a heart rate detection chip, a single-chip microcomputer, and a microcontroller unit in the terminal device. Unit, MCU), etc. The following describes the signal adjustment method with terminal equipment as the main body of execution. As shown in Fig. 2, the signal adjustment method provided in this application includes the following steps:

Step S101: Obtain a first background light signal.

In the photoelectric detection process of the terminal device, since the optical signal received by the terminal device may be affected by changes in the light intensity of the surrounding environment, the first background light signal can be obtained before the optical transmitter in the terminal device emits the optical signal. Wherein, the first background light signal is an original background light signal that has not been adjusted by an amplifier, so as to facilitate adjustment of the first background light signal. Wherein, acquiring the first background light signal may receive the first background light signal through an optical receiver in the terminal device, and the embodiment of the present application does not limit the specific manner of acquiring the first background light signal. The first background light signal can be represented by light intensity, or the first background light signal can be converted into an electrical signal through a photoelectric conversion module, and the electrical signal is used to represent the first background light signal. The embodiment of the present invention compares the first background light signal with The representation of is not restricted.

Step S102: If the intensity of the first background light signal is greater than the first preset threshold, automatically adjust the amplifier gain to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is less than or equal to the first background light signal. The threshold is preset to obtain the second background light signal.

After acquiring the first background light signal, it may be necessary to adjust the first background light signal. For example, when the ambient light is relatively strong, the intensity of the collected first background light signal will also be relatively large. If the intensity of the optical signal is too high, the amount of the target optical signal may be compressed, resulting in the inability to accurately analyze the signal change law of the target optical signal, which will affect the detection result. The target optical signal is the optical signal emitted by the optical transmitter in the terminal device passing through the human body. The optical signal received by the optical receiver. In order to avoid the influence of the excessive intensity of the first background light signal on the target light signal, it can be determined whether the intensity of the first background light signal is greater than the first preset threshold, and if the intensity of the first background light signal is greater than the first preset threshold, Threshold, the amplifier gain is automatically adjusted to adjust the first background light signal so that the intensity of the adjusted first background light signal is less than or equal to the first preset threshold. Obtain a second background light signal, where the second background light signal is the first background light signal adjusted by the amplifier, and the second background light signal has an intensity less than or equal to the first preset threshold.

Among them, the embodiment of the present invention does not limit the size of the first preset threshold, as long as the detection accuracy can be improved by adjusting the intensity of the first background light signal. In a possible implementation, the first background light signal can be converted into an electrical signal form, and the intensity of the first background light signal can be expressed by the current of the electrical signal. In this case, the first preset threshold can be The maximum allowable current in the signal conditioning device provided in the embodiment is used as a reference. For example, the first preset threshold may be 50% of the maximum allowable current, which is not limited in the embodiment of the present invention.

When the ambient light is weak, the intensity of the first background light signal collected will also be relatively small. If the intensity of the first background light signal is too small, it may not be possible to ensure that the mixed light signal is within a reasonable range, resulting in failure Accurately analyze the signal change law of the target light signal, which in turn affects the detection result. In order to ensure that the second background light signal is within a reasonable range, in a possible implementation manner, after the first background light signal is acquired, it also includes :

The embodiment of the present invention does not limit the size of the third preset threshold, as long as the detection accuracy can be improved by adjusting the intensity of the first background light signal. In a possible implementation, the first background light signal can be converted into an electrical signal form, and the intensity of the first background light signal can be represented by the current of the electrical signal. In this case, the third preset threshold can be The maximum allowable current in the signal conditioning device provided in the embodiment is used as a reference. For example, the third preset threshold may be 10% of the maximum allowable current, which is not limited in the embodiment of the present invention.

Step S103: Obtain a mixed optical signal, and obtain a target optical signal according to the mixed optical signal and the first background light signal or the second background light signal. The target optical signal is the optical signal emitted by the optical transmitter and received by the optical receiver after passing through the human body. Light signal.

When the terminal equipment photoelectrically detects the human heart rate, the light transmitter in the terminal equipment emits signal light of a certain wavelength, and after reflection, scattering and absorption by the skin tissue, a part of the light can be emitted from the surface of the skin tissue and received by the light Receiver. However, part of the optical signal actually received by the optical receiver comes from the ambient optical signal, and the other part comes from the optical signal emitted by the optical transmitter. The mixed optical signal is the optical signal after the optical signal actually received by the optical receiver passes through the amplifier. If the intensity of the first background optical signal is within the preset range and no amplifier adjustment is required, the mixed optical signal includes the first background optical signal And the target light signal, the target light signal can be obtained by subtracting the first background light signal from the mixed light signal; if the intensity of the first background light signal is not within the preset range, the first background light signal needs to be adjusted to obtain the second The background light signal. At this time, the mixed light signal represents the second background light signal and the target light signal, and the target light signal can be obtained by subtracting the second background light signal from the mixed light signal. Wherein, before acquiring the mixed optical signal, if the intensity of the first background light signal is greater than the first preset threshold, or if the intensity of the first background light signal is less than the third preset threshold, the terminal device automatically adjusts the amplifier gain , So that the intensity of the adjusted first background light signal is less than or equal to the first preset threshold and greater than or equal to the third preset threshold. In the process of adjusting the first background light signal, it is achieved by automatically adjusting the gain of the amplifier. Therefore, after the target light signal passes through the amplifier, it will also be preliminarily adjusted by the amplifier. When it is strong, automatically reduce the amplifier gain to reduce the intensity of the background light signal. At the same time, it will also reduce the intensity of the target light signal, which may lead to insufficient intensity of the target light signal and inconvenient to analyze the change state of the target light signal. This further affects the detection result. Therefore, after obtaining the target light signal, the target light signal needs to be adjusted.

Step S104: If the intensity of the target light signal is less than the second preset threshold, the driving current is automatically adjusted. The driving current is the current for driving the light emitter to emit the light signal, so that the intensity of the target light signal is greater than or equal to the second preset threshold .

If the intensity of the target light signal is too small, it will affect the analysis result of the target light signal, thereby affecting the accuracy of the detection result. Therefore, the target light signal needs to be adjusted to a reasonable range. Wherein, judging whether the target light signal is within a reasonable range can be achieved by setting a second preset threshold. For example, if the intensity of the target light signal is greater than or equal to the second preset threshold, the target light signal is within a reasonable range within. If the intensity of the target light signal is less than the second preset threshold, the intensity of the target light signal needs to be increased, where the intensity of the target light signal is related to the light intensity of the light signal emitted by the terminal device, and the driver provides the driving current for the light emitter. Therefore, the intensity of the light signal emitted by the light emitter can be adjusted by automatically adjusting the drive current. Therefore, when the intensity of the target optical signal is less than the second preset threshold, the intensity of the optical signal emitted by the optical transmitter can be increased by increasing the drive current, and then the intensity of the target optical signal is enhanced, so that the intensity of the target optical signal is greater than or equal to The second preset threshold.

In addition, since the mixed light signal is a mixture of the second background light signal and the target light signal, in another possible implementation manner, if the intensity of the mixed light signal is less than the second preset threshold, the driving current is automatically adjusted, In order to make the intensity of the mixed optical signal greater than or equal to the second preset threshold value, the adjustment of the target optical signal is achieved by setting a different second preset threshold value. The embodiment of the present invention does not limit the manner of adjusting the target optical signal.

The intensity of the adjusted target light signal is greater than or equal to the second preset threshold. Among them, the embodiment of the present invention does not limit the size of the second preset threshold, as long as the detection accuracy can be improved by adjusting the intensity of the target light signal. In addition, in a possible implementation, the target optical signal can also be converted into an electrical signal form, and the current of the electrical signal can be used to indicate the intensity of the target optical signal. In this case, the second preset threshold can be implemented in this application. The maximum allowable current in the signal conditioning device provided in the example is used as a reference. For example, the second preset threshold may be 15% of the maximum allowable current, which is not limited in the embodiment of the present invention.

In this solution, if the intensity of the first background light signal is greater than the first preset threshold, the amplifier gain is automatically adjusted so that the intensity of the adjusted first background light signal is less than or equal to the first preset threshold to obtain the second background The light signal ensures that the intensity of the second background light signal is within a reasonable range. Then, the target light signal is acquired, and when the intensity of the target light signal is less than the second preset threshold, the drive current is automatically adjusted to adjust the target light signal to ensure the target The intensity of the optical signal is within a reasonable range, and the automatic adjustment of the optical signal is realized, thereby improving the accuracy of the detection result.

When the ambient light of the terminal device is dark, if the intensity of the target light signal is weak, the driving current can be automatically adjusted so that the intensity of the target light signal is greater than or equal to the second preset threshold, but the driving current is automatically adjusted To adjust the target optical signal may cause waste of power resources. In a possible implementation manner, on the basis of the foregoing embodiment, FIG. 3 is a flowchart of a signal adjustment method provided by another embodiment of the present application, wherein the The method can be executed by a signal conditioning device, which can be implemented by software and/or hardware. For example, the device can be part or all of a terminal device, and the terminal device can be a wearable device, such as a heart rate bracelet, a heart rate headset, etc. , It can also be medical equipment, fitness equipment, etc. The device can also be a heart rate detection chip, a single-chip microcomputer, MCU, etc. in a terminal device. The following describes the signal adjustment method with the terminal device as the executive body, as shown in Figure 3. The signal adjustment method provided in the application, after obtaining the target light signal according to the mixed light signal and the first background light signal or the second background light signal, further includes:

Step S201: If the intensity of the first background light signal or the second background light signal is less than the third preset threshold, and the intensity of the target light signal is less than the third preset threshold, automatically adjust the amplifier gain so that the adjusted first The intensity of the background light signal or the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first preset threshold.

When the intensity of the first background light signal or the second background light signal is less than the third preset threshold, it is determined whether the intensity of the target light signal is less than the third preset threshold. If the intensity of the first background light signal or the second background light signal is Less than the third preset threshold and the intensity of the target light signal is less than the third preset threshold, the first background light signal or the second background light signal and the target light signal can be dynamically adjusted by automatically increasing the amplifier gain, so that the first A background light signal or a second background light signal and a target light signal are amplified simultaneously, so that the intensity of the adjusted first background light signal or the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first Preset threshold. In addition, when the intensity of the first background light signal or the second background light signal is less than the third preset threshold and the intensity of the target light signal is less than the third preset threshold, the background light signal is adjusted by automatically increasing the amplifier gain to achieve When the ambient light signal interference is small, the power consumption of the terminal equipment is effectively reduced.

Optionally, on the basis of the foregoing embodiment, FIG. 4 is a flowchart of a signal adjustment method provided by another embodiment of the present application, wherein the method may be executed by a signal adjustment device, which may be implemented by software and/or hardware. For example, the device can be part or all of a terminal device, and the terminal device can be a wearable device, such as a heart rate bracelet, a heart rate headset, etc., or a medical device, a fitness device, etc., and the device can also be a terminal device In the heart rate detection chip, single-chip microcomputer, MCU, etc., the following describes the signal adjustment method with the terminal device as the main body of execution. As shown in Fig. 4, the signal adjustment method provided in this application further includes the following steps:

Step S301: If the intensity of the target optical signal is greater than or equal to the second preset threshold, and the intensity of the mixed optical signal is greater than or equal to the fourth preset threshold, the driving current is automatically adjusted so that the intensity of the mixed optical signal is less than the fourth preset threshold. Set the threshold.

In step S104, if the intensity of the target light signal is less than the second preset threshold, the target light signal is adjusted by automatically adjusting the drive current so that the intensity of the target light signal is greater than or equal to the second preset threshold, which solves the problem The target light signal is too weak to accurately analyze the target light signal, which makes the detection result inaccurate. At the same time, in order to ensure the accuracy of the detection result, it is also necessary to consider that if the mixed light signal is too strong, the target light signal cannot be accurately identified For example, the mixed optical signal has reached saturation, and the intensity of the mixed optical signal received by the terminal device is a constant value. Therefore, the target optical signal obtained by subtracting the background light signal from the mixed signal is also a constant value, so it cannot be accurate Obtain the target light signal. In view of this situation, the embodiment of the present application sets the fourth preset threshold to make the mixed optical signal within a reasonable range. If the intensity of the target optical signal is greater than or equal to the second preset threshold, and the intensity of the mixed optical signal is greater than or equal to The fourth preset threshold automatically reduces the drive current so that the intensity of the mixed optical signal is less than the fourth preset threshold.

Since the mixed optical signal is a mixture of the background optical signal and the target optical signal, the mixed optical signal is too strong, resulting in the problem that the target optical signal cannot be accurately identified. In a possible implementation manner, if the intensity of the target optical signal is greater than The fifth preset threshold, and the intensity of the background light signal is less than or equal to the first preset threshold, then the drive current is automatically adjusted so that the intensity of the target light signal is less than the fifth preset threshold and greater than or equal to the second preset threshold .

After step S102, the intensity of the background light signal is less than or equal to the first preset threshold. If the intensity of the target light signal is too large, for example, greater than or equal to the fifth preset threshold, the driving current can be automatically reduced to make the target The intensity of the optical signal is less than or equal to the fifth preset threshold and greater than or equal to the second preset threshold, wherein the sum of the fifth preset threshold and the first preset threshold is less than or equal to the fourth preset threshold. By automatically reducing the drive current when the target light signal is too large, the target light signal is not only realized within a reasonable range, thereby ensuring the accuracy of the detection result, but also saving energy consumption.

In another possible implementation, if the intensity of the target light signal is greater than the fifth preset threshold, and the intensity of the background light signal is greater than or equal to the third preset threshold, the amplifier gain is automatically reduced to make the target light signal The intensity is less than or equal to the fifth preset threshold. Wherein, the sum of the fifth preset threshold and the third preset threshold is less than or equal to the fourth preset threshold. In addition, when the intensity of the target optical signal is too strong, for example, when the intensity of the target optical signal is greater than the fifth preset threshold, the amplifier gain and the drive current can be automatically adjusted at the same time, so that the mixed optical signal and the target optical signal All within a reasonable range. The embodiment of the present invention does not limit this.

In this solution, when the intensity of the target optical signal is greater than or equal to the third preset threshold, the intensity of the mixed optical signal is considered, and the driving current is automatically adjusted to ensure that the intensity of the mixed optical signal is less than the fourth preset threshold. In order to solve the problem of inaccurate detection results due to the strong intensity of the mixed optical signal, the power consumption can also be reduced.

The following will introduce signal conditioning devices, equipment, chips, storage media, and computer program products. The effects can be referred to the effects of the method section, which will not be repeated below.

Fig. 5 is a schematic structural diagram of a signal conditioning device provided by an embodiment of the present application. The device can be implemented by software and/or hardware. For example: the device may be part or all of the terminal equipment. The terminal device can be a wearable device, such as a heart rate bracelet, a heart rate headset, etc., or a medical device, fitness equipment, etc. The device can also be a heart rate detection chip, a single-chip microcomputer, an MCU, etc. in the terminal device. The device is used as The terminal device is taken as an example for description. As shown in FIG. 5, the signal conditioning apparatus provided in the embodiment of the present application may include:

The first acquiring module 41 is configured to acquire the first background light signal.

The first adjustment module 42 is configured to automatically adjust the amplifier gain if the intensity of the first background light signal is greater than the first preset threshold to adjust the intensity of the first background light signal, so that the intensity of the adjusted first background light signal is If it is less than or equal to the first preset threshold, the second background light signal is obtained.

The second acquisition module 43 is used to acquire the mixed light signal, and obtain the target light signal according to the mixed light signal and the first background light signal or the second background light signal. The target light signal is the light signal emitted by the light emitter after passing through the human body. The optical signal received by the optical receiver.

The second adjustment module 44 is configured to automatically adjust the driving current if the intensity of the target light signal is less than the second preset threshold. The driving current is the current for driving the light emitter to emit the light signal, so that the intensity of the target light signal is greater than or equal to The second preset threshold.

Optionally, FIG. 6 is a schematic structural diagram of a signal conditioning device provided by another embodiment of the present application, and the device may be implemented by software and/or hardware. For example: the device may be part or all of the terminal equipment. The terminal device can be a wearable device, such as a heart rate bracelet, a heart rate headset, etc., or a medical device, fitness equipment, etc. The device can also be a heart rate detection chip, a single-chip microcomputer, an MCU, etc. in the terminal device. The device is used as The terminal device is taken as an example for description. As shown in FIG. 6, the signal conditioning apparatus provided in the embodiment of the present application may further include:

The third adjustment module 51, if the intensity of the first background light signal is less than the third preset threshold, automatically adjusts the amplifier gain to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is greater than or It is equal to the third preset threshold and less than or equal to the first preset threshold to obtain the second background light signal.

Optionally, as shown in FIG. 6, the signal conditioning device provided in this application may further include:

The fourth adjustment module 52 is configured to automatically adjust the amplifier gain if the intensity of the first background light signal or the second background light signal is less than the third preset threshold, and the intensity of the target light signal is less than the third preset threshold, so that The intensity of the adjusted first background light signal or the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first preset threshold.

Optionally, FIG. 7 is a schematic structural diagram of a signal conditioning device provided by another embodiment of the present application, and the device may be implemented by software and/or hardware. For example: the device may be part or all of the terminal equipment. The terminal device can be a wearable device, such as a heart rate bracelet, a heart rate headset, etc., it can also be a medical device, a fitness device, etc., the device can also be a heart rate detection chip, a single-chip microcomputer, an MCU, etc. in the terminal device. Terminal equipment is taken as an example for description. As shown in Figure 7, the signal conditioning device provided in this application further includes:

The fifth adjustment module 53 is configured to automatically adjust the driving current if the intensity of the target optical signal is greater than or equal to the second preset threshold, and the intensity of the mixed optical signal is greater than or equal to the fourth preset threshold, so that the mixed optical signal is The intensity is less than the fourth preset threshold.

This application provides a chip. FIG. 8 is a schematic diagram of a chip provided by an embodiment of the present application. As shown in FIG. 8, the chip provided by this application includes:

The amplifier 61, the driver 63, and the signal conditioning device 62 as described in the above embodiment, wherein the amplifier 61 is used to amplify the optical signal received by the optical receiver; the driver 63 is used to drive the optical transmitter to emit the optical signal. For specific content and effects, please refer to the method embodiment.

Optionally, the chip provided by this application can not only adjust the optical signal in the analog domain, but also adjust the optical signal in the digital domain. FIG. 9 is a schematic diagram of a chip provided by another embodiment of the application, as shown in FIG. 9. As shown, the chip provided by this application can also include:

The analog-to-digital converter 64 and the digital-to-analog converter 65 are used to convert the analog signal sent by the amplifier to a digital signal; the digital-to-analog converter 65 is used to convert the digital signal sent by the signal conditioning device to an analog signal.

This application provides a terminal device. FIG. 10 is a schematic diagram of a terminal device provided by an embodiment of the present invention. As shown in FIG. 10, the terminal device provided by this application includes:

The processor 71, the memory 72, the transceiver 73 and the computer program; wherein the transceiver 73 implements the transmission and reception of optical signals by the terminal device. The computer program is stored in the memory 72 and is configured to be executed by the processor 71. The program includes instructions for executing the above-mentioned signal adjustment method. For the content and effect, please refer to the method embodiment.

The present application provides a computer storage medium. The storage medium includes computer instructions. When the instructions are executed by a computer, the computer realizes the above-mentioned signal adjustment method.

This application provides a computer program product, including computer instructions, when the instructions are executed by a computer, the computer realizes the signal adjustment method as described above.

A person of ordinary skill in the art can understand that all or part of the steps in the foregoing method embodiments can be implemented by a program instructing relevant hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, it executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk and other media that can store program codes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention range.

Claims

A signal adjustment method, characterized by comprising:

Acquiring the first background light signal;

If the intensity of the first background light signal is greater than the first preset threshold, the amplifier gain is automatically adjusted to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is less than or equal to the first background light signal. Said first preset threshold to obtain a second background light signal;

Obtain a mixed light signal, and obtain a target light signal according to the mixed light signal and the first background light signal or the second background light signal, and the target light signal is the light signal emitted by the light emitter after passing through the human body. The optical signal received by the optical receiver;

If the intensity of the target light signal is less than the second preset threshold, the driving current is automatically adjusted, and the driving current is the current that drives the light emitter to emit the light signal, so that the intensity of the target light signal is greater than or equal to The second preset threshold.
The method according to claim 1, wherein after said obtaining the first background light signal, the method further comprises:

If the intensity of the first background light signal is less than the third preset threshold, the amplifier gain is automatically adjusted to adjust the intensity of the first background light signal so that the intensity of the adjusted first background light signal is greater than or equal to all The third preset threshold is less than or equal to the first preset threshold to obtain a second background light signal.
The method according to claim 1, wherein after obtaining a target light signal according to the mixed light signal and the first background light signal or the second background light signal, the method further comprises:

If the intensity of the first background light signal or the second background light signal is less than a third preset threshold, and the intensity of the target light signal is less than the third preset threshold, the amplifier gain is automatically adjusted to make The intensity of the adjusted first background light signal or the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first preset threshold.
The method according to any one of claims 1 to 3, further comprising:

If the intensity of the target optical signal is greater than or equal to the second preset threshold, and the intensity of the mixed optical signal is greater than or equal to the fourth preset threshold, the drive current is automatically adjusted to make the mixed optical signal The intensity is less than the fourth preset threshold.
A signal conditioning device, characterized by comprising:

The first acquisition module is used to acquire the first background light signal;

The first adjustment module is configured to automatically adjust the amplifier gain if the intensity of the first background light signal is greater than the first preset threshold to adjust the intensity of the first background light signal so that the adjusted first background light The intensity of the signal is less than or equal to the first preset threshold to obtain a second background light signal;

The second acquisition module is configured to acquire a mixed optical signal, and obtain a target optical signal according to the mixed optical signal, and the first background light signal or the second background light signal, and the target optical signal is emitted by the light emitter The optical signal received by the optical receiver after passing through the human body;

The second adjustment module is configured to automatically adjust the driving current if the intensity of the target light signal is less than the second preset threshold, and the driving current is the current that drives the light emitter to emit the light signal so that the target The intensity of the optical signal is greater than or equal to the second preset threshold.
The device according to claim 5, further comprising:

The third adjustment module, if the intensity of the first background light signal is less than the third preset threshold, automatically adjusts the amplifier gain to adjust the intensity of the first background light signal so that the adjusted first background light signal is The intensity is greater than or equal to the third preset threshold and less than or equal to the first preset threshold to obtain a second background light signal.
The device according to claim 5, further comprising:

The fourth adjustment module is configured to: if the intensity of the first background light signal or the second background light signal is less than a third preset threshold, and the intensity of the target light signal is less than the third preset threshold, then The amplifier gain is automatically adjusted so that the intensity of the adjusted first background light signal or the second background light signal is greater than or equal to the third preset threshold and less than or equal to the first preset threshold.
The device according to any one of claims 5 to 7, further comprising:

The fifth adjustment module is configured to automatically adjust the driving current if the intensity of the target optical signal is greater than or equal to the second preset threshold and the intensity of the mixed optical signal is greater than or equal to the fourth preset threshold. Make the intensity of the mixed optical signal smaller than the fourth preset threshold.
A chip, characterized by comprising: an amplifier, a driver, and the signal conditioning device according to any one of claims 5 to 8,

Wherein, the amplifier is used to amplify the optical signal received by the optical receiver;

The driver is used to drive the light emitter to emit light signals.
The chip of claim 9, further comprising an analog-to-digital converter and a digital-to-analog converter,

The analog-to-digital converter is used to convert an analog signal sent by the amplifier to a digital signal;

The digital-to-analog converter is used to convert the digital signal sent by the signal conditioning device to an analog signal.
A device, characterized by comprising the chip according to any one of claims 9 to 10.
A computer storage medium, wherein the storage medium includes computer instructions, and when the instructions are executed by a computer, the computer realizes the signal adjustment method according to any one of claims 1 to 4 .