CN107920767B - Photoelectric reflection heart rate detection method and device - Google Patents
Photoelectric reflection heart rate detection method and device Download PDFInfo
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- CN107920767B CN107920767B CN201580070957.6A CN201580070957A CN107920767B CN 107920767 B CN107920767 B CN 107920767B CN 201580070957 A CN201580070957 A CN 201580070957A CN 107920767 B CN107920767 B CN 107920767B
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Abstract
The invention discloses a photoelectric reflection heart rate detection method, which comprises the following steps: when a heart rate detection instruction is received, adjusting the brightness of the LED light source according to a preset mode, and detecting frequency waveforms corresponding to the brightness (S10); when the frequency waveform is detected to be the optimal waveform, taking the corresponding brightness as the optimal brightness (S20); and controlling the LED light source to emit light signals according to the optimal brightness, and performing heart rate detection (S30). The invention also discloses a photoelectric reflection heart rate detection device. The heart rate detection is carried out according to the optical signals with the optimal brightness, so that the optical signals emitted when the heart rate is detected through photoelectric reflection can be adapted to the physical condition of a person to be detected, the amplitude of the detected frequency waveform is obvious and excessively smooth, and the heart rate detection accuracy is improved.
Description
Technical Field
The invention relates to the field of heart rate detection, in particular to a photoelectric reflection heart rate detection method and device.
Background
Under the irradiation of a light source with a constant wavelength, part of light emitted to a human body is absorbed by the human body, the rest part of the light is diffusely reflected and returned by blood, the blood of the human body changes along with the pulsation of the heart, and meanwhile, the change of the light reflected and returned by the blood is caused. Photoelectric reflection heart rate detection is mainly used for indirectly detecting heart rate signals of a human body by detecting the change of light reflected and returned by blood of the human body.
In the photoelectric reflection heart rate detection process, the heart rate signals obtained by reflecting the emitted light signals through the human body are very weak, and meanwhile, the brightness of the required light signals is different due to different body conditions of skin color, fat, thinness and the like of each person. In traditional photoelectric reflection heart rate testing process, the luminance of the light signal of transmission is fixed, has caused from this that the heart rate signal that detects is unstable because the quality conditions such as human complexion, fat thin are different, measures the success rate and hang down. Especially when the brightness is not appropriate, the heart rate signal is hardly detectable. Therefore, in the existing photoelectric reflection heart rate detection process, the problem of low heart rate detection accuracy caused by the fact that the brightness of the emitted light signal is not suitable for the physical condition of the person to be detected is solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to solve the problem of low heart rate detection accuracy caused by the fact that the brightness of an emitted optical signal is not suitable for the physical condition of a person to be detected in the existing photoelectric reflection heart rate detection process.
In order to achieve the above object, the present invention provides a photoelectric reflection heart rate detection method, which comprises the following steps:
when a heart rate detection instruction is received, adjusting the brightness of an LED light source according to a preset mode, and detecting frequency waveforms corresponding to all the brightness;
when the frequency waveform is detected to be the optimal waveform, taking the corresponding brightness as the optimal brightness;
and controlling the LED light source to emit light signals according to the optimal brightness, and carrying out heart rate detection.
Preferably, when the heart rate detection instruction is received, the brightness of the LED light source is adjusted according to a preset mode,
and after the step of detecting the frequency waveform corresponding to each brightness, the method further comprises the following steps:
and when detecting that all frequency waveforms corresponding to the brightnesses are not the optimal waveforms, controlling the LED light source to emit light signals according to preset brightness, and detecting the heart rate.
Preferably, when receiving the heart rate detection instruction, the step of adjusting the brightness of the LED light source according to a preset manner, and detecting the frequency waveform corresponding to each brightness includes:
when a heart rate detection instruction is received, controlling the LED light source to gradually reduce the brightness from the maximum brightness to emit a first light signal;
receiving a second optical signal reflected based on the first optical signal, and converting the second optical signal corresponding to each brightness into a corresponding frequency waveform;
and judging whether the frequency waveform corresponding to each brightness is the optimal waveform.
Preferably, the optimal waveform is a waveform in which the proportion of the step waveform in the whole section of waveform is less than or equal to a preset proportion threshold;
the step of judging whether the frequency waveform corresponding to each brightness is the optimal waveform comprises the following steps:
analyzing the frequency waveform, and determining the proportion of a step wave in the frequency waveform to the whole waveform;
comparing the determined ratio to the ratio threshold;
determining the frequency waveform as the optimal waveform when the determined ratio is less than or equal to the ratio threshold.
Preferably, the optimal waveform is a waveform in which the length of the longest step wave is less than or equal to a preset length threshold;
the step of judging whether the frequency waveform corresponding to each brightness is the optimal waveform comprises the following steps:
analyzing the frequency waveform, and determining the length of the longest step wave in the frequency waveform;
comparing the determined length to the length threshold;
determining the frequency waveform as the optimal waveform when the determined length is less than or equal to the length threshold.
Preferably, the step of determining whether the frequency waveform corresponding to each luminance is an optimal waveform includes:
judging whether the proportion of the step wave in the frequency waveform in the whole section of waveform is less than or equal to a preset proportion threshold value;
when the proportion of the step wave in the frequency waveform to the whole waveform is less than or equal to a preset proportion threshold value,
judging whether the length of the longest step wave in the frequency waveform is smaller than or equal to a preset length threshold value or not;
and when the length of the longest step wave in the frequency waveform is less than or equal to the length threshold value, determining the frequency waveform as the optimal waveform.
Preferably, the preset manner is to control the LED light source to gradually increase the brightness from the lowest brightness to emit the first light signal until the optimal waveform is detected or the maximum brightness of the LED light source is increased.
In addition, in order to achieve the above object, the present invention further provides a photoelectric reflection heart rate detecting apparatus, including:
the adjusting module is used for adjusting the brightness of the LED light source according to a preset mode and detecting frequency waveforms corresponding to the brightness when a heart rate detection instruction is received;
the determining module is used for taking the corresponding brightness as the optimal brightness when the frequency waveform is detected to be the optimal waveform;
and the heart rate detection module is used for controlling the LED light source to emit the light signal according to the optimal brightness and detecting the heart rate.
Preferably, the heart rate detection module is further configured to control the LED light source to emit a light signal according to a preset brightness when it is detected that all frequency waveforms corresponding to the brightnesses are not the optimal waveforms, and perform heart rate detection.
Preferably, the adjusting module comprises a control unit, a conversion unit and a judgment unit;
the control unit is used for controlling the LED light source to gradually reduce the brightness from the maximum brightness to emit a first light signal when receiving a heart rate detection instruction;
the conversion unit is used for receiving a second optical signal reflected based on the first optical signal and converting the second optical signal corresponding to each brightness into a corresponding frequency waveform;
and the judging unit is used for judging whether the frequency waveform corresponding to each brightness is the optimal waveform.
Preferably, the judging unit comprises a first analyzing subunit, a first comparing subunit and a first determining subunit;
the first analysis subunit is configured to analyze the frequency waveform and determine a proportion of a stepped wave in the frequency waveform to the whole-segment waveform;
the first comparison subunit is used for comparing the determined proportion with the proportion threshold value;
the first determining subunit is configured to determine that the frequency waveform is the optimal waveform when the determined proportion is less than or equal to the proportion threshold.
Preferably, the judging unit comprises a second analyzing subunit, a second ratio subunit and a second determining subunit;
the second analyzing subunit is configured to analyze the frequency waveform, and determine a length of a longest step wave in the frequency waveform;
the second comparison subunit is used for comparing the determined length with the length threshold;
the second determining subunit is configured to determine that the frequency waveform is the optimal waveform when the determined length is less than or equal to the length threshold.
Preferably, the determining unit is further configured to determine whether a ratio of a stepped wave in the frequency waveform to the entire waveform is smaller than or equal to a preset ratio threshold;
the judging unit is further configured to judge whether the length of the longest step wave in the frequency waveform is less than or equal to a preset length threshold when the proportion of the step wave in the frequency waveform in the whole section of the waveform is less than or equal to the preset proportion threshold;
the judging unit is further configured to determine that the frequency waveform is the optimal waveform when the length of the longest step wave in the frequency waveform is less than or equal to the length threshold.
Preferably, the preset manner is to control the LED light source to gradually increase the brightness from the lowest brightness to emit the first light signal until the optimal waveform is detected or the maximum brightness of the LED light source is increased.
According to the invention, the brightness of the LED light source is adjusted, the frequency waveform corresponding to each brightness is detected, the brightness when the optimal waveform is detected is taken as the optimal brightness, and the optical signal is emitted according to the optimal brightness to carry out heart rate detection, so that the emitted optical signal can adapt to the physical condition of a person to be detected when the photoelectric reflection detects the heart rate, the amplitude of the detected frequency waveform is obvious and excessively smooth, and the accuracy of the heart rate detection is improved.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting heart rate by photoelectric reflection according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a non-optimal waveform of the present invention with a sawtooth waveform;
FIG. 3 is a schematic diagram of an optimal waveform of the present invention;
FIG. 4 is a flowchart illustrating a second embodiment of the method for detecting heart rate by photoelectric reflection according to the present invention;
FIG. 5 is a flowchart illustrating a third exemplary embodiment of a method for detecting heart rate by photoelectric reflection according to the present invention;
FIG. 6 is a schematic flow chart of a fourth embodiment of the method for detecting heart rate by photoelectric reflection according to the present invention;
FIG. 7 is a functional block diagram of a first embodiment of the device for detecting heart rate by photoelectric reflection according to the present invention;
FIG. 8 is a functional block diagram of a second embodiment of the device for detecting heart rate by photoelectric reflection according to the present invention;
FIG. 9 is a functional block diagram of a third embodiment of the device for detecting heart rate by photoelectric reflection according to the present invention;
fig. 10 is a functional block diagram of a fourth embodiment of the device for detecting heart rate through photoelectric reflection according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: when a heart rate detection instruction is received, adjusting the brightness of an LED light source according to a preset mode, and detecting frequency waveforms corresponding to all the brightness; when the frequency waveform is detected to be the optimal waveform, taking the corresponding brightness as the optimal brightness; and controlling the LED light source to emit light signals according to the optimal brightness, and carrying out heart rate detection.
In the existing photoelectric reflection heart rate detection process, the heart rate detection accuracy is low due to the fact that the brightness of the emitted light signals is not suitable for the physical condition of a person to be detected.
Based on the above problems, the present invention provides a method for detecting a heart rate by photoelectric reflection.
Referring to fig. 1, fig. 1 is a schematic flow chart of a photoelectric reflection heart rate detection method according to a first embodiment of the present invention. In this embodiment, the method for detecting a heart rate by photoelectric reflection includes the following steps:
step S10, when a heart rate detection instruction is received, the brightness of the LED light source is adjusted according to a preset mode, and frequency waveforms corresponding to the brightness are detected;
the LED light source is used for emitting light signals required by heart rate detection, and the LED light source can emit light signals with different brightness under the control of the microprocessor. Preferably, the LED light source is a double-green-light LED light source, the double-green-light LED light source is an LED light source with the light-emitting wavelength of 570nm, and the measurement precision is higher.
The preset mode can be that the LED light source is controlled to gradually reduce the brightness from the maximum brightness to emit a first light signal until the optimal waveform is detected or the brightness is reduced to a preset minimum brightness; alternatively, the preset manner may be to control the LED light source to emit the first light signal by gradually increasing the brightness from the lowest brightness until the optimal waveform is detected or the maximum brightness of the LED light source is increased.
Preferably, the microprocessor can output current data to the current source chip, and the current source chip outputs corresponding current to drive the LED light source to emit a light signal required for heart rate detection. The current source chip is preferably an adjustable current source chip, and the current output by the adjustable current source chip is controlled by a microprocessor so as to adjust the brightness of an optical signal emitted by the LED light source.
Step S20, when detecting that the frequency waveform is an optimal waveform, taking the corresponding brightness as the optimal brightness;
the optimal waveform can be a waveform with the proportion of the step waveform in the whole section of waveform being less than or equal to a preset proportion threshold; alternatively, the optimal waveform may also be a waveform in which the length of the longest step wave is less than or equal to a preset length threshold; alternatively, the optimal waveform may also be a waveform in which the ratio of the step waveform to the entire waveform is less than or equal to a preset ratio threshold, and the length of the longest step wave is less than or equal to a preset length threshold. Referring to fig. 2 and 3, fig. 2 is a schematic diagram of a sawtooth waveform of a non-optimal waveform in the present invention, and fig. 3 is a schematic diagram of an optimal waveform in the present invention.
Preferably, when the frequency waveform is detected to be the optimal waveform, the corresponding brightness is used as the optimal brightness, the current value of the corresponding LED light source is recorded at the same time, and the adjustable current source chip is controlled to drive the LED light source to emit the light signal at the constant current value to perform the heart rate detection.
And step S30, controlling the LED light source to emit light signals according to the optimal brightness, and performing heart rate detection.
The LED light source can be controlled by the microprocessor to emit a light signal with constant brightness according to the optimal brightness so as to detect the heart rate. Preferably, the heart rate detection is performed by controlling the LED light source to emit a light signal with constant brightness according to the optimal brightness, and detecting the heart rate times according to a photoelectric conversion principle and a counting and measuring principle of a microprocessor.
Further, when it is detected that all frequency waveforms corresponding to the luminances are not the optimal waveforms, the LED light source is controlled to emit light signals according to preset luminances, and heart rate detection is performed.
The preset brightness is the default LED light source brightness when the optimal brightness is not detected. So as to emit a light signal at the preset brightness when the optimum brightness is not detected. Preferably, when receiving a heart rate detection instruction, the LED light source may be controlled to gradually decrease the brightness from the maximum brightness to emit a first light signal until the brightness decreases to a preset minimum brightness, and when the brightness of the LED light source decreases to the minimum brightness, if the optimal waveform is not detected, the LED light source may be controlled to perform heart rate detection according to the minimum brightness. The luminance of LED light source is adjusted to the this embodiment to detect the frequency waveform that each luminance corresponds, luminance when detecting the best waveform is as best luminance, according to best luminance emission light signal carries out the heart rate and detects, when making the photoelectric reflection detect the heart rate, the light signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessively level and smooth, has improved the accuracy that the heart rate detected.
Referring to fig. 4, fig. 4 is a flowchart illustrating a photoelectric reflection heart rate detection method according to a second embodiment of the present invention. Based on the first embodiment of the foregoing photoelectric reflection heart rate detection method, the step S10 includes:
step S11, when a heart rate detection instruction is received, the LED light source is controlled to gradually reduce the brightness from the maximum brightness to emit a first light signal;
the heart rate detection instruction can be triggered by providing a physical key for heart rate detection; or a heart rate detection instruction triggered by the user based on the shortcut icon can be detected by providing the shortcut icon for heart rate detection; or, a touch key for heart rate detection may be provided, and the heart rate detection instruction is triggered when a touch operation of the user based on the touch key is detected.
The first optical signal is an optical signal with constant brightness and emitted to a human body by an LED light source and is used for detecting a second optical signal reflected by the human body, a corresponding frequency waveform is determined according to the light intensity of the second optical signal, and the change of the second optical signal is synchronous with the change of blood of the human body and further synchronous with the change of heart rate of the human body.
The microprocessor can be used for controlling the adjustable current source chip to output the saturation current of the LED light source so as to drive the LED light source to emit a first light signal according to the maximum brightness, and detecting a corresponding frequency waveform at the maximum brightness; if the frequency waveform is not the optimal waveform, controlling an adjustable current source chip to reduce a first-level (preferably, 5mA is the first level) driving current through a microprocessor so as to reduce the brightness of the LED light source to emit a first light signal, and detecting the corresponding frequency waveform; if the frequency waveform is not the optimal waveform, controlling an adjustable current source chip to reduce the primary driving current again through a microprocessor so as to further reduce the brightness of the LED light source to emit a first light signal, and detecting the corresponding frequency waveform; and repeating the steps until the LED light source is reduced to the preset minimum brightness. The minimum brightness is the brightness of the LED light source corresponding to the preset lower limit current, so that when the LED light source is reduced to the minimum brightness, if the optimal waveform cannot be detected, heart rate detection is carried out according to default brightness.
Step S12, receiving a second optical signal reflected based on the first optical signal, and converting the second optical signal corresponding to each luminance into a corresponding frequency waveform;
preferably, the second optical signal reflected based on the first optical signal may be received by an optical frequency receiving converter, and the second optical signal corresponding to each luminance may be converted into a corresponding frequency waveform by the optical frequency receiving converter.
In step S13, it is determined whether or not the frequency waveform corresponding to each luminance is the optimum waveform.
The frequency waveform obtained by conversion can be sent to the microprocessor through the optical frequency conversion receiver, and the microprocessor judges whether the frequency waveform corresponding to each brightness is the optimal waveform through a signal waveform judgment algorithm. Whether the frequency waveform is the optimal waveform can be determined by judging whether the frequency waveform corresponding to each brightness has a sawtooth wave or a flat wave, and the frequency waveform is determined to be the optimal waveform when the sawtooth wave or the flat wave does not exist in the frequency waveform.
Preferably, whether the frequency waveform is the optimal waveform can be determined by judging whether the proportion of the step wave in the frequency waveform in the whole waveform is less than or equal to a preset proportion threshold value; or, it may also be determined whether the frequency waveform is an optimal waveform by determining whether the length of the longest step wave in the frequency waveform is less than or equal to a preset length threshold; or, it may also be determined whether the length of the longest step wave in the frequency waveform is less than or equal to a preset length threshold by determining whether a ratio of the step wave in the frequency waveform to the whole-segment waveform is less than or equal to a preset ratio threshold, and determining that the frequency waveform is the optimal waveform when the length of the longest step wave in the frequency waveform is less than or equal to the length threshold.
The luminance of LED light source is adjusted to the this embodiment to detect the frequency waveform that each luminance corresponds, luminance when detecting the best waveform is as best luminance, according to best luminance emission light signal carries out the heart rate and detects, when making the photoelectric reflection detect the heart rate, the light signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessively level and smooth, has improved the accuracy that the heart rate detected.
Referring to fig. 5, fig. 5 is a flowchart illustrating a third embodiment of the method for detecting a heart rate by photoelectric reflection according to the present invention. Based on the second embodiment of the foregoing photoelectric reflection heart rate detection method, the step S13 includes:
step S310, analyzing the frequency waveform, and determining the proportion of a step wave in the frequency waveform to the whole section of waveform;
step S311, comparing the determined ratio with the ratio threshold;
in step S312, when the determined ratio is less than or equal to the ratio threshold, the frequency waveform is determined to be the optimal waveform.
The optimal waveform is a waveform with the proportion of the step waveform in the whole section of waveform less than or equal to a preset proportion threshold. The frequency waveform obtained by conversion can be sent to a microprocessor through a photoelectric conversion receiver, and the microprocessor analyzes the frequency waveform through a signal waveform judgment algorithm and determines the proportion of a step wave in the frequency waveform to the whole-segment waveform; comparing the determined ratio to the ratio threshold; determining the frequency waveform as the optimal waveform when the determined ratio is less than or equal to the ratio threshold; determining that the frequency waveform is not the optimal waveform when the determined ratio is greater than the ratio threshold.
This embodiment confirms best waveform through the proportion that judges the ladder wave in the frequency waveform account for whole section waveform, and then confirms best luminance, according to best luminance emission optical signal carries out heart rate detection for when photoelectric reflection detects the heart rate, the optical signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessive level and smooth, has improved the accuracy that the heart rate detected.
Referring to fig. 6, fig. 6 is a schematic flow chart of a fourth embodiment of the method for detecting a heart rate by photoelectric reflection according to the present invention. Based on the second embodiment of the foregoing photoelectric reflection heart rate detection method, the step S13 includes:
step S320, analyzing the frequency waveform, and determining the length of the longest step wave in the frequency waveform;
step S321, comparing the determined length with the length threshold;
step S322, determining the frequency waveform as the optimal waveform when the determined length is less than or equal to the length threshold.
The optimal waveform is a waveform with the length of the longest step wave less than or equal to a preset length threshold. The frequency waveform obtained by conversion can be sent to a microprocessor through a photoelectric conversion receiver, and the microprocessor analyzes the frequency waveform through a signal waveform judgment algorithm and determines the length of the longest step wave in the frequency waveform; comparing the determined length to the length threshold; determining the frequency waveform as the optimal waveform when the determined length is less than or equal to the length threshold; determining that the frequency waveform is not the optimal waveform when the determined length is greater than the length threshold.
The length of the longest ladder wave in the frequency waveform is judged to this embodiment, confirms best waveform, and then confirms best luminance, according to best luminance emission light signal carries out heart rate detection for when photoelectric reflection detects the heart rate, the light signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessively level and smooth, has improved the accuracy that the heart rate detected.
The executing main body of the photoelectric reflection heart rate detection method of the first to fourth embodiments can be a heart rate detection device or a photoelectric reflection heart rate detector. Still further, the photoelectric reflection heart rate detection method may be implemented by a client detection program installed on a heart rate detection device or a photoelectric reflection heart rate detector.
The invention further provides a photoelectric reflection heart rate detection device.
Referring to fig. 7, fig. 7 is a functional module schematic diagram of a photoelectric reflection heart rate detection apparatus according to a first embodiment of the invention. In this embodiment, the apparatus for detecting heart rate by photoelectric reflection comprises: the device comprises an adjusting module 10, a determining module 20 and a heart rate detecting module 30.
The adjusting module 10 is configured to adjust the brightness of the LED light source according to a preset manner and detect a frequency waveform corresponding to each brightness when receiving a heart rate detection instruction;
the LED light source is used for emitting light signals required by heart rate detection, and the LED light source can emit light signals with different brightness under the control of the microprocessor. Preferably, the LED light source is a double-green-light LED light source, the double-green-light LED light source is an LED light source with the light-emitting wavelength of 570nm, and the measurement precision is higher.
The preset mode can be that the LED light source is controlled to gradually reduce the brightness from the maximum brightness to emit a first light signal until the optimal waveform is detected or the brightness is reduced to a preset minimum brightness; alternatively, the preset manner may be to control the LED light source to emit the first light signal by gradually increasing the brightness from the lowest brightness until the optimal waveform is detected or the maximum brightness of the LED light source is increased.
Preferably, the microprocessor can output current data to the current source chip, and the current source chip outputs corresponding current to drive the LED light source to emit a light signal required for heart rate detection. The current source chip is preferably an adjustable current source chip, and the current output by the adjustable current source chip is controlled by a microprocessor so as to adjust the brightness of an optical signal emitted by the LED light source.
A determining module 20, configured to, when it is detected that the frequency waveform is an optimal waveform, take the corresponding brightness as an optimal brightness;
the optimal waveform can be a waveform with the proportion of the step waveform in the whole section of waveform being less than or equal to a preset proportion threshold; alternatively, the optimal waveform may also be a waveform in which the length of the longest step wave is less than or equal to a preset length threshold; alternatively, the optimal waveform may also be a waveform in which the ratio of the step waveform to the entire waveform is less than or equal to a preset ratio threshold, and the length of the longest step wave is less than or equal to a preset length threshold. Referring to fig. 2 and 3, fig. 2 is a schematic diagram of a sawtooth waveform of a non-optimal waveform in the present invention, and fig. 3 is a schematic diagram of an optimal waveform in the present invention.
Preferably, when the frequency waveform is detected to be the optimal waveform, the corresponding brightness is used as the optimal brightness, the current value of the corresponding LED light source is recorded at the same time, and the adjustable current source chip is controlled to drive the LED light source to emit the light signal at the constant current value to perform the heart rate detection.
And the heart rate detection module 30 is used for controlling the LED light source to emit a light signal according to the optimal brightness and detecting the heart rate.
The LED light source can be controlled by the microprocessor to emit a light signal with constant brightness according to the optimal brightness so as to detect the heart rate. Preferably, the heart rate detection is performed by controlling the LED light source to emit a light signal with constant brightness according to the optimal brightness, and detecting the heart rate times according to a photoelectric conversion principle and a counting and measuring principle of a microprocessor.
Further, the heart rate detection module 30 is further configured to control the LED light source to emit a light signal according to a preset brightness when it is detected that all frequency waveforms corresponding to the brightnesses are not the optimal waveforms, and perform heart rate detection.
The preset brightness is the default LED light source brightness when the optimal brightness is not detected. So as to emit a light signal at the preset brightness when the optimum brightness is not detected. Preferably, when receiving a heart rate detection instruction, the LED light source may be controlled to gradually decrease the brightness from the maximum brightness to emit a first light signal until the brightness decreases to a preset minimum brightness, and when the brightness of the LED light source decreases to the minimum brightness, if the optimal waveform is not detected, the LED light source may be controlled to perform heart rate detection according to the minimum brightness.
The luminance of LED light source is adjusted to the this embodiment to detect the frequency waveform that each luminance corresponds, luminance when detecting the best waveform is as best luminance, according to best luminance emission light signal carries out the heart rate and detects, when making the photoelectric reflection detect the heart rate, the light signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessively level and smooth, has improved the accuracy that the heart rate detected.
Referring to fig. 8, fig. 8 is a functional module diagram of a photoelectric reflection heart rate detection apparatus according to a second embodiment of the present invention. Based on the first embodiment of the above photoelectric reflection heart rate detection apparatus, the adjusting module 10 includes a control unit 11, a conversion unit 12, and a determination unit 13;
the control unit 11 is configured to control the LED light source to gradually decrease the brightness from the maximum brightness to emit a first light signal when receiving a heart rate detection instruction;
the heart rate detection instruction can be triggered by providing a physical key for heart rate detection; or a heart rate detection instruction triggered by the user based on the shortcut icon can be detected by providing the shortcut icon for heart rate detection; or, a touch key for heart rate detection may be provided, and the heart rate detection instruction is triggered when a touch operation of the user based on the touch key is detected.
The first optical signal is an optical signal with constant brightness and emitted to a human body by an LED light source and is used for detecting a second optical signal reflected by the human body, a corresponding frequency waveform is determined according to the light intensity of the second optical signal, and the change of the second optical signal is synchronous with the change of blood of the human body and further synchronous with the change of heart rate of the human body.
The microprocessor can be used for controlling the adjustable current source chip to output the saturation current of the LED light source so as to drive the LED light source to emit a first light signal according to the maximum brightness, and detecting a corresponding frequency waveform at the maximum brightness; if the frequency waveform is not the optimal waveform, controlling an adjustable current source chip to reduce a first-level (preferably, 5mA is the first level) driving current through a microprocessor so as to reduce the brightness of the LED light source to emit a first light signal, and detecting the corresponding frequency waveform; if the frequency waveform is not the optimal waveform, controlling an adjustable current source chip to reduce the primary driving current again through a microprocessor so as to further reduce the brightness of the LED light source to emit a first light signal, and detecting the corresponding frequency waveform; and repeating the steps until the LED light source is reduced to the preset minimum brightness. The minimum brightness is the brightness of the LED light source corresponding to the preset lower limit current, so that when the LED light source is reduced to the minimum brightness, if the optimal waveform cannot be detected, heart rate detection is carried out according to default brightness.
The conversion unit 12 is configured to receive a second optical signal reflected based on the first optical signal, and convert the second optical signal corresponding to each luminance into a corresponding frequency waveform;
preferably, the second optical signal reflected based on the first optical signal may be received by an optical frequency receiving converter, and the second optical signal corresponding to each luminance may be converted into a corresponding frequency waveform by the optical frequency receiving converter.
The determining unit 13 is configured to determine whether the frequency waveform corresponding to each brightness is an optimal waveform.
The frequency waveform obtained by conversion can be sent to the microprocessor through the optical frequency conversion receiver, and the microprocessor judges whether the frequency waveform corresponding to each brightness is the optimal waveform through a signal waveform judgment algorithm. Whether the frequency waveform is the optimal waveform can be determined by judging whether the frequency waveform corresponding to each brightness has a sawtooth wave or a flat wave, and the frequency waveform is determined to be the optimal waveform when the sawtooth wave or the flat wave does not exist in the frequency waveform.
Preferably, whether the frequency waveform is the optimal waveform can be determined by judging whether the proportion of the step wave in the frequency waveform in the whole waveform is less than or equal to a preset proportion threshold value; or, it may also be determined whether the frequency waveform is an optimal waveform by determining whether the length of the longest step wave in the frequency waveform is less than or equal to a preset length threshold; or, it may also be determined whether the length of the longest step wave in the frequency waveform is less than or equal to a preset length threshold by determining whether a ratio of the step wave in the frequency waveform to the whole-segment waveform is less than or equal to a preset ratio threshold, and determining that the frequency waveform is the optimal waveform when the length of the longest step wave in the frequency waveform is less than or equal to the length threshold.
The luminance of LED light source is adjusted to the this embodiment to detect the frequency waveform that each luminance corresponds, luminance when detecting the best waveform is as best luminance, according to best luminance emission light signal carries out the heart rate and detects, when making the photoelectric reflection detect the heart rate, the light signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessively level and smooth, has improved the accuracy that the heart rate detected.
Referring to fig. 9, fig. 9 is a functional block diagram of a third embodiment of the photoelectric reflection heart rate detection apparatus according to the present invention. Based on the second embodiment of the above photoelectric reflection heart rate detecting apparatus, the determining unit 13 includes a first analyzing subunit 130, a first comparing subunit 131, and a first determining subunit 132;
the first analyzing subunit 130 is configured to analyze the frequency waveform, and determine a ratio of a stepped wave in the frequency waveform to the entire waveform;
the first comparison subunit 131 is configured to compare the determined ratio with the ratio threshold;
the first determining subunit 132 is configured to determine that the frequency waveform is the optimal waveform when the determined ratio is less than or equal to the ratio threshold.
The optimal waveform is a waveform with the proportion of the step waveform in the whole section of waveform less than or equal to a preset proportion threshold. The frequency waveform obtained by conversion can be sent to a microprocessor through a photoelectric conversion receiver, and the microprocessor analyzes the frequency waveform through a signal waveform judgment algorithm and determines the proportion of a step wave in the frequency waveform to the whole-segment waveform; comparing the determined ratio to the ratio threshold; determining the frequency waveform as the optimal waveform when the determined ratio is less than or equal to the ratio threshold; determining that the frequency waveform is not the optimal waveform when the determined ratio is greater than the ratio threshold.
This embodiment confirms best waveform through the proportion that judges the ladder wave in the frequency waveform account for whole section waveform, and then confirms best luminance, according to best luminance emission optical signal carries out heart rate detection for when photoelectric reflection detects the heart rate, the optical signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessive level and smooth, has improved the accuracy that the heart rate detected.
Referring to fig. 10, fig. 10 is a functional block diagram of a fourth embodiment of the photoelectric reflection heart rate detection apparatus according to the present invention. Based on the second embodiment of the above-mentioned photoelectric reflection heart rate detection apparatus, the determining unit includes a second parsing subunit 133, a second ratio subunit 134, and a second determining subunit 135;
the second analyzing subunit 133 is configured to analyze the frequency waveform, and determine a length of a longest step wave in the frequency waveform;
the second comparison subunit 134 is configured to compare the determined length with the length threshold;
the second determining subunit 135 is configured to determine that the frequency waveform is the optimal waveform when the determined length is less than or equal to the length threshold.
The optimal waveform is a waveform with the length of the longest step wave less than or equal to a preset length threshold. The frequency waveform obtained by conversion can be sent to a microprocessor through a photoelectric conversion receiver, and the microprocessor analyzes the frequency waveform through a signal waveform judgment algorithm and determines the length of the longest step wave in the frequency waveform; comparing the determined length to the length threshold; determining the frequency waveform as the optimal waveform when the determined length is less than or equal to the length threshold; determining that the frequency waveform is not the optimal waveform when the determined length is greater than the length threshold.
The length of the longest ladder wave in the frequency waveform is judged to this embodiment, confirms best waveform, and then confirms best luminance, according to best luminance emission light signal carries out heart rate detection for when photoelectric reflection detects the heart rate, the light signal of transmission can the adaptation wait to detect people's physique condition, makes the frequency waveform amplitude that detects obvious and excessively level and smooth, has improved the accuracy that the heart rate detected.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A photoelectric reflection heart rate detection method is characterized by comprising the following steps:
when a heart rate detection instruction is received, adjusting the brightness of an LED light source according to a preset mode, and detecting frequency waveforms corresponding to all the brightness;
when the frequency waveform is detected to be the optimal waveform, taking the corresponding brightness as the optimal brightness;
controlling the LED light source to emit light signals according to the optimal brightness, and carrying out heart rate detection;
when receiving a heart rate detection instruction, adjusting the brightness of the LED light source according to a preset mode, and detecting the frequency waveform corresponding to each brightness, wherein the step comprises the following steps:
when a heart rate detection instruction is received, controlling the LED light source to gradually reduce the brightness from the maximum brightness to emit a first light signal;
receiving a second optical signal reflected based on the first optical signal, and converting the second optical signal corresponding to each brightness into a corresponding frequency waveform;
judging whether the frequency waveform corresponding to each brightness is the optimal waveform;
the optimal waveform is a waveform with the proportion of the step waveform in the whole section of waveform being less than or equal to a preset proportion threshold;
the step of judging whether the frequency waveform corresponding to each brightness is the optimal waveform comprises the following steps:
analyzing the frequency waveform, and determining the proportion of a step wave in the frequency waveform to the whole waveform;
comparing the determined ratio to the ratio threshold;
determining the frequency waveform as the optimal waveform when the determined ratio is less than or equal to the ratio threshold.
2. The photo-electric reflection heart rate detection method according to claim 1, wherein after the step of adjusting the brightness of the LED light source according to a preset manner and detecting the frequency waveform corresponding to each brightness when receiving the heart rate detection command, the method further comprises:
and when detecting that all frequency waveforms corresponding to the brightnesses are not the optimal waveforms, controlling the LED light source to emit light signals according to preset brightness, and detecting the heart rate.
3. The photo-electric reflection heart rate detection method according to claim 1, wherein the optimal waveform is a waveform in which the length of the longest step wave is less than or equal to a preset length threshold;
the step of judging whether the frequency waveform corresponding to each brightness is the optimal waveform comprises the following steps:
analyzing the frequency waveform, and determining the length of the longest step wave in the frequency waveform;
comparing the determined length to the length threshold;
determining the frequency waveform as the optimal waveform when the determined length is less than or equal to the length threshold.
4. The method according to claim 1, wherein the step of determining whether the frequency waveform corresponding to each brightness is the optimal waveform comprises:
judging whether the proportion of the step wave in the frequency waveform in the whole section of waveform is less than or equal to a preset proportion threshold value;
when the proportion of the step waves in the frequency waveforms in the whole section of waveforms is smaller than or equal to a preset proportion threshold value, judging whether the length of the longest step wave in the frequency waveforms is smaller than or equal to a preset length threshold value;
and when the length of the longest step wave in the frequency waveform is less than or equal to the length threshold value, determining the frequency waveform as the optimal waveform.
5. The method according to claim 1, wherein the predetermined manner is to control the LED light source to emit the first light signal with gradually increasing brightness from the lowest brightness until the optimal waveform is detected or the maximum brightness of the LED light source is increased.
6. An apparatus for detecting heart rate by photoelectric reflection, comprising:
the adjusting module is used for adjusting the brightness of the LED light source according to a preset mode and detecting frequency waveforms corresponding to the brightness when a heart rate detection instruction is received;
the determining module is used for taking the corresponding brightness as the optimal brightness when the frequency waveform is detected to be the optimal waveform;
the heart rate detection module is used for controlling the LED light source to emit light signals according to the optimal brightness and carrying out heart rate detection;
the adjusting module comprises a control unit, a conversion unit and a judging unit;
the control unit is used for controlling the LED light source to gradually reduce the brightness from the maximum brightness to emit a first light signal when receiving a heart rate detection instruction;
the conversion unit is used for receiving a second optical signal reflected based on the first optical signal and converting the second optical signal corresponding to each brightness into a corresponding frequency waveform;
the judging unit is used for judging whether the frequency waveform corresponding to each brightness is the optimal waveform;
the judging unit comprises a first analyzing subunit, a first comparing subunit and a first determining subunit;
the first analysis subunit is configured to analyze the frequency waveform and determine a proportion of a stepped wave in the frequency waveform to the whole-segment waveform;
the first comparison subunit is used for comparing the determined proportion with a proportion threshold value;
the first determining subunit is configured to determine that the frequency waveform is the optimal waveform when the determined proportion is less than or equal to the proportion threshold.
7. The apparatus according to claim 6, wherein the heart rate detecting module is further configured to control the LED light source to emit a light signal at a predetermined brightness and perform heart rate detection when all of the frequency waveforms corresponding to the respective brightnesses are not optimal waveforms.
8. The photo-electric reflection heart rate detection device of claim 6, wherein the determining unit comprises a second analyzing subunit, a second comparing subunit and a second determining subunit;
the second analyzing subunit is configured to analyze the frequency waveform, and determine a length of a longest step wave in the frequency waveform;
the second comparison subunit is used for comparing the determined length with a length threshold value;
the second determining subunit is configured to determine that the frequency waveform is the optimal waveform when the determined length is less than or equal to the length threshold.
9. The apparatus according to claim 6, wherein the determining unit is further configured to determine whether a ratio of a step wave in the frequency waveform to the whole waveform is smaller than or equal to a preset ratio threshold;
the judging unit is further configured to judge whether the length of the longest step wave in the frequency waveform is less than or equal to a preset length threshold when the proportion of the step wave in the frequency waveform in the whole section of the waveform is less than or equal to the preset proportion threshold;
the judging unit is further configured to determine that the frequency waveform is the optimal waveform when the length of the longest step wave in the frequency waveform is less than or equal to the length threshold.
10. The apparatus according to claim 6, wherein the predetermined manner is to control the LED light source to emit the first light signal with gradually increasing brightness from the lowest brightness until the optimal waveform is detected or the maximum brightness of the LED light source is increased.
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| PCT/CN2015/087924 WO2017031665A1 (en) | 2015-08-24 | 2015-08-24 | Method and apparatus for detecting heart rate by means of photoelectric reflection |
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| CN113384255B (en) * | 2019-01-30 | 2024-03-15 | 深圳市汇顶科技股份有限公司 | Method and device for heart rate detection and electronic equipment |
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| CN103327894A (en) * | 2011-01-19 | 2013-09-25 | 加利福尼亚大学董事会 | Apparatus, systems, and methods for tissue oximetry and perfusion imaging |
| CN203943664U (en) * | 2013-08-14 | 2014-11-19 | 深圳市西微数字技术有限公司 | Wearable detection heart rate device |
| CN104207755A (en) * | 2013-06-03 | 2014-12-17 | 飞比特公司 | Wearable heart rate monitor |
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| US7181264B2 (en) * | 2002-03-12 | 2007-02-20 | Sekos, Inc. | Method and apparatus for noninvasive physiologic monitoring |
| JP3760920B2 (en) * | 2003-02-28 | 2006-03-29 | 株式会社デンソー | Sensor |
| KR101040653B1 (en) * | 2009-01-21 | 2011-06-10 | 서울대학교산학협력단 | Non-contact measuring devices of pulse wave and measuring devices of oxygen saturation and blood pressure in using same |
| US9717423B2 (en) * | 2013-01-28 | 2017-08-01 | Texas Instruments Incorporated | Low-complexity sensor displacement tolerant pulse oximetry based heart rate measurement |
| CN103549944A (en) * | 2013-10-30 | 2014-02-05 | 广州先越宝仑电子科技有限公司 | Heart rate measurement method and device |
| CN203662747U (en) * | 2013-12-20 | 2014-06-25 | 深圳创维－Rgb电子有限公司 | Heart rate measuring circuit and photoelectric heart rate measuring instrument |
| CN104605838A (en) * | 2015-01-19 | 2015-05-13 | 深圳市元征科技股份有限公司 | Heart rate detection method and device |
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| CN103327894A (en) * | 2011-01-19 | 2013-09-25 | 加利福尼亚大学董事会 | Apparatus, systems, and methods for tissue oximetry and perfusion imaging |
| CN104207755A (en) * | 2013-06-03 | 2014-12-17 | 飞比特公司 | Wearable heart rate monitor |
| CN203943664U (en) * | 2013-08-14 | 2014-11-19 | 深圳市西微数字技术有限公司 | Wearable detection heart rate device |
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