TW201726048A - Method for processing physiologic sensed signal - Google Patents

Abstract

A method of processing physiological sensed signal is disclosed and includes: fetching a physiological sensed signal from a physiological detector, calculating signal aspects based on the sensed signal, adjusting a DC offset, and then adjusting signal intensity. The present invention dynamically adjusts operational parameters of the optical detector based on the signal aspects to adjust and improve detection quality and calculation preciseness for the physiological signal. In particular, the present invention can integrate more information and is applicable to a wearable device such that the user easily acquires physiological information. Further, the user is informed of the wearing state of the wearable device to achieve power saving.

Description

Physiological signal measurement processing method

The invention relates to a physiological signal measurement processing method, in particular, when a user wears a wearable device and uses a physiological sensor to measure a physiological signal, the user can actively determine the wearing state of the user and dynamically adjust the physiological sensing. The parameter settings of the device are used to improve the quality of the physiological signal and the accuracy of the calculation.

As the general public pays more and more attention to health care and sports, related companies continue to develop many wearable devices that can be used to detect physiological signals. The most commonly used wearable devices are watches or headphones that measure heart rate, which is convenient to wear. And it also has the advantage of easy operation.

However, the conventional wearable device that uses the optical module to measure the physiological signal is susceptible to the skin color, ambient light, and wearability of the tester, which affects the signal quality, causing errors in subsequent heart rate calculations. Therefore, in the physiological measurement, the device needs to judge the physiological signal quality, adjust the measurement module setting appropriately, and feedback the effect of the user measurement to adjust the wearing effect.

For example, US 9083589, entitled "Active Signal Processing Personal Health Signal Receivers" in the prior art, mainly teaches a signal receiver including an automatic gain controller, a demodulator and a symbol recovery unit, which can be received according to Actively adjusting the signal receiver and generating an output signal after the frequency and power of the encoded signal, and reconstructing the encoded signal after being received by the demodulator to approximate the original uncoded signal, and the symbol recovery unit receives the reconstructed encoded signal and determines The signal clock and phase of the encoded signal are reconstructed to produce an error-free corresponding decoded signal. The purpose of this patent is to improve the quality of the transmitted signal, especially by using the signal-to-noise ratio (SNR) to adjust the gain controller to improve the quality of the transmitted signal, but there is no actual adjustment of the physiological signal quality.

In another titled "Portable biometric monitoring devices and US 8954135, the method of operating the same, includes a housing, a physiological sensor, and a processing circuit unit, wherein the physiological sensor and the processing circuit unit are housed in the housing, and are generated by the physiological sensor corresponding to the user The physiological condition information, and the physiological sensor comprises a first light source, a light sensor, a first light pipe, the first light source generates output light, the light sensor detects scattered light, and the first light pipe is used In order to guide light, in addition, the processing circuit unit uses the data of the scattered light to calculate the user's heartbeat. However, US 8954135 only teaches the hardware structure and measurement process of the physiological measuring device, and does not have any signal quality detection and adjustment mechanism. .

In addition, Taiwan Patent No. M282646 discloses a portable physiological parameter measurement display device, including an optical sensor, an analog/digital conversion unit, a microprocessor, and a display unit, wherein an optical sensor is used to detect a pulse wave of a user. The signal is digitally converted by the analog/digital conversion unit to generate a digital pulse wave signal, and the microprocessor uses a high-speed operation to calculate the pulse signal of the digital pulse wave to obtain the heartbeat parameter and the heart rate variability parameter of the user. As the required physiological parameters, it is finally displayed by the display unit. However, M282646 has the disadvantage of revealing only the hardware architecture of the physiological measurement device without any mechanism for improving the detection and adjustment of the signal quality.

Therefore, there is a great need for a physiological signal measurement system and an operation method thereof, which can adjust the physiological signal quality according to characteristics such as SNR, and can improve the effect, including improving the physiological signal quality, and feedback the user signal measurement effect, especially in the physiological signal. When the quality is poor or the physiological signal quality is affected by the physiological condition of the user (such as skin color), the quality of the signal and the degree of the affected signal can be detected to adjust the signal quality and improve the effect of the physiological signal calculation, so as to solve all the problems of the above-mentioned conventional technology. .

The main purpose of the present invention is to provide a physiological signal measurement processing method, which can adjust the setting value of at least one operating parameter of the physiological sensor according to the signal characteristic of the physiological signal, thereby improving the measurement quality and the calculation accuracy of the physiological signal. The method mainly includes: after starting the physiological sensor, sensing the physiological signal of the human body to generate at least one sensing signal as a physiological signal, and reading the sensing signal, and the physiological sensing device measuring function has Setting at least one operating parameter; calculating a signal characteristic of the sensing signal; and adjusting and setting an operating parameter of the physiological sensor according to the signal characteristic. In particular, the operating parameter may include at least one of a reference offset (DC offset) and a signal strength, and the signal feature may include an average value, a maximum value, a minimum value of the sensing signal, At least one of the signal to noise ratios.

Another object of the present invention is to provide a physiological signal measurement processing method, comprising: sensing a physiological signal of a human body after starting a physiological sensor, generating at least one sensing signal as a physiological signal, and measuring the physiological sensing device The function has at least one operational parameter that can be set; the sensing signal is read to determine whether the sensing signal is within a preset reasonable range; if not within the preset reasonable range, it is determined whether the adjustment number exceeds the upper limit value, if If the upper limit value is exceeded, the message indicating that the signal is bad is reported, and if the upper limit value is not exceeded, at least one operating parameter of the physiological sensor is adjusted and set; and if the sensing signal is within a preset reasonable range, The sensing signal is stored in a storage medium, such as a data buffer of the memory, and then the signal characteristics of the sensing signal are calculated, and it is determined whether the operating parameters of the physiological sensor are adjusted. If adjustment is needed, the operating parameters are adjusted and set. If no adjustment is needed, return to the step of continuing to read the sensing signal.

Therefore, the signal processing procedure of the method of the present invention can be applied to a wearable device, and when the wearable device performs measurement, the measurement module setting value can be automatically and dynamically adjusted according to the physiological signal characteristics of the signal processing, thereby adjusting the physiological signal quality. For the calculation of the subsequent physiological signals and state judgment. Therefore, the present invention has the advantages of improving the accuracy of the physiological signal processing, reporting the state of the user's current wear, and achieving the power saving function according to these states.

S1, S10, S20, S30‧‧ steps

S2, S11, S12, S13, S14, S15, S21, S22, S31‧‧

The first figure shows a flow chart of a physiological signal measurement processing method according to an embodiment of the present invention.

The second and third figures show the results of the sensing analysis of two different examples.

The fourth figure shows a flow chart of a physiological signal measurement processing method according to another embodiment of the present invention.

The embodiments of the present invention will be described in more detail below with reference to the drawings and the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

Referring to the first figure, a schematic flowchart of a physiological signal measurement processing method according to an embodiment of the present invention is shown. As shown in the first figure, the physiological signal measurement processing method of the embodiment of the present invention mainly includes steps. Steps S1, S10, S20, and S30 are used to adjust the set value of at least one operation parameter of the physiological sensor according to the signal characteristic of the physiological signal, thereby improving the measurement quality of the physiological signal and the accuracy of the calculation, and therefore, is suitable for Applied to wearable devices such as Optical Heart Rate Measurement (OHRM).

Specifically, the physiological signal measurement processing method in the embodiment of the present invention starts from step S1, and then performs step S10, which is mainly to sense the human physiological signal by the physiological sensor to generate at least one sensing signal as a physiological signal. And reading the sensing signal of the physiological sensor, wherein the physiological sensing device measuring function, in particular, has at least one operational parameter that can be set, such as at least one of a reference offset (DC offset) and a signal strength. One.

Then, the process proceeds to step S20, where the signal characteristics of the sensing signal are calculated, wherein the signal feature may include at least one of an average value, a maximum value, a minimum value, and a signal to noise ratio (SNR) of the sensing signal. It is also possible to first determine whether the number of sensing signals reaches a preset value. If the preset value is not reached, proceed to step S10 to read the sensing signal, and when the preset value is reached, proceed to step S20 to avoid the sense. Insufficient test signals affect the accuracy of subsequent processing.

Further, a high-pass filter (HPF) can be used to extract the noise data in the sensing signal and use a band-pass filter (BPF) to sense the noise. In the signal, the main signal is taken out, and the offset of the noise and the main signal is removed, and the ratio of the main signal to the noise, that is, the SNR, is calculated.

Finally, in step S30, according to the signal feature calculated in step S20, the operating parameters of the physiological sensor are appropriately adjusted and set to improve the quality and accuracy of the measurement, for example, the operation parameter may include the reference offset and/or Or signal strength, and then return to step S10. More specifically, the adjustment of the reference offset may include reading the environmental signal first to assist in determining whether the reference offset exceeds the abnormal critical range and being abnormal, and appropriately adjusting the reference offset when the reference offset is abnormal. . For example, when the reference offset is too high, it may be caused by incorrect user wear. In this case, the user needs to adjust the reference offset of the physiological sensor to adapt to the change of the actual environmental signal. . Furthermore, the adjustment of the signal strength may be achieved by increasing the intensity of the sensing signal or lowering the proportion of the noise corresponding to the sensing signal.

It should be noted that the above step S30 can only adjust the reference offset or the signal strength, and can also adjust the reference offset and the signal strength, wherein the reference offset or the signal can be adjusted first. Degrees, i.e., different orders of reference offset or signal strength, are included in the present invention.

In addition, in step S30, the signal quality of the sensing signal is determined according to the SNR, and when the signal quality is not good, the signal strength of the main signal is increased, and the SNR is also increased. For example, when the SNR value is less than 0, the energy representing the main signal is smaller than the noise. It may be caused by the user's poor wearing method, which causes the physiological sensor to not correctly sense the human physiological signal, so when adjusting After the operation parameters are still unable to improve the SNR to greater than 0, the current poor signal status can be reported to the user, thereby reminding the user to properly adjust the wearing method.

Referring to the second and third figures, the results of the sensing analysis of the two exemplary embodiments of the present invention are respectively displayed, wherein the second figure indicates that the user wears poorly and has an incomplete waveform, and the third figure shows that the wearing method is good. And have a complete waveform.

The specific effects achieved by the method of the present invention will be described in detail below using the second and third figures. The second figure (a) represents 6000 original physiological sensing signals. For example, the present invention can be configured in a wearable device such as a watch or a earphone, so that the user can measure the physiological sensor after wearing the watch or the earphone. The amount of optical change (PPG signal) of blood in a blood vessel to determine or calculate the physiological characteristics of the subject, such as the heartbeat. The second figure (b) is the main signal obtained after the original sensing signal of the second figure (a) is processed by the BPF, and the second figure (c) is the noise of the original sensing signal after the HPF processing. Because the wear effect is not good, the waveform of the second figure (b) is incomplete and is easily affected by the wearer's motion and surrounding signals, and the calculated SNR is 15.70 dB.

Similarly, in the sensing analysis result of the third figure, the third figure (a) represents 6000 original physiological sensing signals, and the third figure (b) is the original sensing signal of the third figure (a) processed by BPF. The main signal obtained afterwards, and the third figure (c) is the noise of the original sensing signal after being processed by HPF. Obviously, because the wear effect is good, the third figure (b) has a complete waveform and the calculated SNR reaches 35.14 dB. That is, it can be judged from the SNR reading that the signal of the third graph example is indeed better than the signal of the second graph example. It can be seen from the above examples that the wearable device using the physiological signal measurement processing method of the present invention can determine the quality of the signal according to the SNR ratio, and then adjust the module parameters to improve the physiological signal measurement and calculation results.

Referring to the fourth figure, a flowchart of a physiological signal measurement processing method according to another embodiment of the present invention is similar to the first embodiment, but further achieves other useful functions, especially determining whether the sensing signal is abnormal. Limit the number of adjustments, and also remind users that they must Adjust the way you wear.

Specifically, the physiological signal measurement processing method according to another embodiment of the present invention includes steps S2, S11, S12, S13, S14, S15, S21, S22, and S31, and steps S2, S11, and S21 are noted. S31 is the same as steps S1, S10, S20, and S30 of the first embodiment, and therefore will not be described again. Only the technical contents of steps S12, S13, S14, S15, and S22 will be described below.

Step S12 is performed after step S11, mainly to determine whether the sensing signal of the physiological sensor is within a predetermined reasonable range, such as whether the sensing signal is too low or too high, and if the sensing signal is within a preset reasonable range. If yes, the process proceeds to step S13. If the sensing signal is not within the preset reasonable range, the process proceeds to step S14.

In step S13, the sensing signal is stored in a storage medium, such as a data buffer of the memory, and then step S21 is performed to calculate the signal feature, and then in step S22, it is determined whether to adjust the operating parameter of the physiological sensor. If it is not necessary to adjust the operating parameters of the physiological sensor, return to step S11, continue to read the sensing signal of the physiological sensor, and repeat the subsequent operation, and if it is necessary to adjust the operating parameters of the physiological sensor, enter Step S14.

In step S14, it is determined whether the number of adjustments of the operation parameters of the entire physiological sensor exceeds the upper limit value. If the upper limit value is not exceeded, the process proceeds to step S31, the operational parameters of the physiological sensor are adjusted, and then returns to step S11. If the operating parameter of the physiological sensor has exceeded the upper limit value, it indicates that the user's wearing manner may be poor, and it is impossible to improve the signal quality by adjusting the operating parameters of the physiological sensor, so the process proceeds to step S15, and the sensing signal is transmitted. Bad information is returned to the user, and the specific method of returning may include displaying text, vibration, ringing or flashing light, but the reward method of the present invention is not limited thereto, but any way to notify the user Should be covered.

In summary, the main feature of the present invention is that when a user wears a wearable device having a physiological signal measurement processing method and measures a physiological signal using a physiological sensor, the physiological sensor can actively determine the wear of the user. The state, and dynamically adjust the physiological sensor parameter settings, in order to improve the physiological signal quality and the accuracy of the calculation. In particular, it can improve the physiological signal quality according to the signal characteristics of the sensing signal, and feedback the user signal measurement effect, and can detect when the physiological signal quality is poor or the physiological signal quality is affected by the physiological condition of the user (such as skin color). found out Adjust the quality of the signal and the degree of impact to improve the quality of the physiological signal calculation.

The above is only a preferred embodiment for explaining the present invention, and is not intended to limit the present invention in any way, and any modifications or alterations to the present invention made in the spirit of the same invention. All should still be included in the scope of the intention of the present invention.

S2, S11, S12, S13, S14, S15, S21, S22, S31‧‧

Claims (10)

A physiological signal measurement processing method includes: after a physiological sensor is activated, a physiological signal is sensed by the physiological sensor to generate at least one sensing signal as a physiological signal; and the at least one sense is read a measurement signal, and the physiological sensing device measuring function, and having at least one operational parameter that can be set; calculating a signal characteristic of the at least one sensing signal; and adjusting and setting the physiological sensor according to the signal characteristic The at least one operational parameter, wherein the at least one operational parameter comprises at least one of a reference offset (DC offset) and a signal strength. According to the physiological signal measurement processing method of claim 1, wherein the signal feature includes at least one of an average value, a maximum value, a minimum value, and a signal to noise ratio (SNR) of the at least one sensing signal. one of them. According to the physiological signal measurement processing method of claim 1, wherein the adjustment of the reference offset includes reading an environmental signal to assist in determining whether the reference offset exceeds an abnormal critical range, and is abnormal. When the reference offset is abnormal, the reference offset is adjusted. According to the physiological signal measurement processing method of claim 1, wherein the adjustment of the signal strength comprises increasing the intensity of the sensing signal or lowering the proportion of noise corresponding to the sensing signal. A physiological signal measurement processing method includes: initiating a step, after a physiological sensor is activated, sensing, by the physiological sensor, a physiological signal of the human body to generate at least one sensing signal as a physiological signal; a first step of reading the at least one sensing signal, and the physiological sensing device measuring function has at least one operational parameter that can be set; and a second step of determining whether the sensing signal is reasonable at a preset In the third step, if the sensing signal is not within the preset reasonable range, proceed to a fourth step to determine whether an adjustment number exceeds an upper limit value, and if the upper limit value is exceeded, enter a a fifth step of reporting a message that the signal is bad, and if the upper limit is not exceeded, adjusting, setting at least one operating parameter of the physiological sensor, and then returning to the first step; and a sixth step And if the sensing signal is within the preset reasonable range, storing the sensing signal to a storage medium, and then calculating a signal characteristic of the at least one sensing signal, and determining whether to adjust the physiological sensor Returning to the fourth step if the at least one operating parameter is to be adjusted, and returning to the first step if the at least one operating parameter is not required to be adjusted, wherein the at least one operation Comprising a number of reference offset (DC offset) a signal strength, and at least one of them. According to the physiological signal measurement processing method of claim 5, the signal feature includes at least one of an average value, a maximum value, a minimum value, and a signal to noise ratio (SNR) of the at least one sensing signal. one of them. According to the physiological signal measurement processing method of claim 5, wherein the adjustment of the reference offset includes reading an environmental signal to assist in determining whether the reference offset exceeds an abnormal critical range, and is abnormal. When the reference offset is abnormal, the reference offset is adjusted. According to the physiological signal measurement processing method of claim 5, the adjustment of the signal strength includes adjusting the intensity of the sensing signal or lowering the proportion of noise corresponding to the sensing signal. According to the physiological signal measurement processing method of claim 5, wherein the physiological sensor's sensing signal is within a predetermined reasonable range, it is first stored in a storage medium for reading. According to the physiological signal measurement processing method of claim 9, wherein the storage medium is a data buffer of a memory.