CN112137601B - Signal processing method, device, vehicle and storage medium - Google Patents
Signal processing method, device, vehicle and storage medium Download PDFInfo
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Abstract
The invention discloses a signal processing method, a device, a vehicle and a storage medium, which are applied to the vehicle, wherein the vehicle comprises the following components: the safety belt, signal processing device, first triaxial acceleration sensor, wherein, the signal processing device includes: the signal processing device is positioned at the front position of the user when the user wears the safety belt, the first triaxial acceleration sensor is arranged in the vehicle, the distance between the first triaxial acceleration sensor and the user is larger than a preset distance, and the first triaxial acceleration sensor is connected with the signal processing device through a wire harness; the signal processing device is used for executing a signal processing method, the method comprises: collecting user information when a user wears the safety belt; heart rate and respiratory rate are determined from physiological signals of the user. Embodiments of the present invention are useful for obtaining high quality heart rate and respiratory rate for use.
Description
Technical Field
The embodiment of the invention relates to the technical field of automobiles, in particular to a signal processing method, a signal processing device, a vehicle and a storage medium.
Background
As automobiles become a daily tool for people to walk, high frequency automobile usage has led to longer and longer times for users in automobiles. Automotive driving requires a high degree of concentration and a good physical condition to ensure driving safety. Busy life makes more and more people be in sub-health state, need pay attention to a plurality of physiological parameters of health in real time to carry out disease prevention, but current physiological signal collection device is mostly through wearing or the mode of short time contact and carries out physiological signal collection, because consider characteristics such as comfort level and portable for contact incompletely or contact time is too short in the gathering process leads to the physiological signal stability and the accuracy of gathering poor.
Disclosure of Invention
The invention provides a vehicle-mounted monitoring method, a vehicle-mounted monitoring device, a vehicle and a storage medium, so that physiological signals of a user are acquired and processed by means of a safety belt, a first triaxial acceleration sensor and signal processing equipment, and high-quality heart rate and respiratory frequency are obtained for use.
In a first aspect, an embodiment of the present invention provides a signal processing method, which is applied to a vehicle, where the vehicle includes: the system comprises a safety belt, a signal processing device and a first triaxial acceleration sensor, wherein the signal processing device comprises: the second triaxial acceleration sensor, the signal processing equipment sets up on the safety belt, when the user wears the safety belt, signal processing device is in user's chest position, first triaxial acceleration sensor sets up in the vehicle is inside, just first triaxial acceleration sensor with distance between the user is greater than the preset distance, first triaxial acceleration sensor with signal processing equipment passes through the pencil and links to each other, signal processing equipment is used for carrying out signal processing method, and this method includes:
Collecting user information when a user wears the safety belt, wherein the user information comprises: a physiological signal and a positional signal; determining the heart rate and the respiratory rate of the user according to the physiological signal of the user and the position signal of the user.
Further, the method further comprises the following steps:
collecting a position signal of the user, wherein the position signal comprises: acceleration values in three directions; if the acceleration value in any direction is greater than or equal to the acceleration threshold value, determining that the user is in a non-stationary state; and if the acceleration values in the three directions are smaller than the acceleration threshold value, determining that the user is in a static state.
Further, determining the heart rate and respiratory rate of the user from the physiological signal of the user and the position signal of the user comprises: and if the user is in a static state, determining the heart rate and the respiratory rate of the user according to the physiological signals of the user.
Further, determining the heart rate and the respiratory rate of the user from the physiological signal of the user and the position signal of the user comprises: when a user wears the safety belt, receiving the environmental noise acquired by the first triaxial acceleration sensor; if the user is in a static state according to the position signal of the user, filtering the physiological signal according to the environmental noise to obtain a target physiological signal; and carrying out band-pass filtering on the target physiological signal to obtain heart rate and respiratory rate.
Further, performing band-pass filtering on the target physiological signal to obtain a heart rate and a respiratory rate includes: band-pass filtering the target physiological signal to obtain a heartbeat signal and a respiratory signal; determining a heart rate from the heartbeat signal; the respiratory frequency is determined from the respiratory signal.
Further, determining the heart rate from the heartbeat signal includes: analyzing and fusing the heartbeat signals through principal components to obtain target heartbeat signals; taking absolute value of the target heartbeat signal and then carrying out Hilbert yellow transformation; and obtaining the heart rate in the preset time after the target heartbeat signal after the Hilbert yellow transformation is subjected to low-pass filtering.
Further, determining the respiratory rate from the respiratory signal comprises: the respiratory signals are subjected to principal component analysis and fusion to obtain target respiratory signals; and determining the respiratory frequency in the preset time according to the target respiratory signal.
In a second aspect, an embodiment of the present invention further provides a signal processing apparatus, including:
the acquisition module is used for acquiring user information when a user wears the safety belt, wherein the user information comprises: a physiological signal and a positional signal;
and the frequency determining module is used for determining the heart rate and the respiratory frequency of the user according to the physiological signal of the user and the position signal of the user.
Further, the acquisition module is specifically configured to: collecting a position signal of the user, wherein the position signal comprises: acceleration values in three directions; if the acceleration value in any direction is greater than or equal to the acceleration threshold value, determining that the user is in a non-stationary state; and if the acceleration values in the three directions are smaller than the acceleration threshold value, determining that the user is in a static state.
Further, the frequency determining module is specifically configured to:
and if the user is in a static state, determining the heart rate and the respiratory rate of the user according to the physiological signals of the user.
Further, the frequency determining module is specifically configured to:
when a user wears the safety belt, receiving the environmental noise acquired by the first triaxial acceleration sensor; if the user is in a static state according to the position signal of the user, filtering the physiological signal according to the environmental noise to obtain a target physiological signal;
and carrying out band-pass filtering on the target physiological signal to obtain heart rate and respiratory rate.
Further, the frequency determining module is specifically configured to:
band-pass filtering the target physiological signal to obtain a heartbeat signal and a respiratory signal;
Determining a heart rate from the heartbeat signal;
the respiratory frequency is determined from the respiratory signal.
Further, the frequency determining module is specifically configured to:
analyzing and fusing the heartbeat signals through principal components to obtain target heartbeat signals;
taking absolute value of the target heartbeat signal and then carrying out Hilbert yellow transformation;
and obtaining the heart rate in the preset time after the target heartbeat signal after the Hilbert yellow transformation is subjected to low-pass filtering.
Further, the frequency determining module is specifically configured to:
the respiratory signals are subjected to principal component analysis and fusion to obtain target respiratory signals;
and determining the respiratory frequency in the preset time according to the target respiratory signal.
In a third aspect, an embodiment of the present invention further provides a vehicle, including:
one or more processors;
storage means for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the signal processing method as described.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a signal processing method as described.
The invention collects user information when a user wears the safety belt through the safety belt, the signal processing equipment and the first triaxial acceleration sensor in the vehicle; the signal processing apparatus includes: the signal processing device is positioned at the chest position of the user when the user wears the safety belt, the first triaxial acceleration sensor is arranged in the vehicle, the distance between the first triaxial acceleration sensor and the user is larger than the preset distance, the first triaxial acceleration sensor is connected with the signal processing device through a wire harness, and user information is collected when the user wears the safety belt; the user information includes: a physiological signal and a positional signal; determining the heart rate and the respiratory rate of the user according to the physiological signal of the user and the position signal of the user. The problems of unstable acquired physiological signals and poor accuracy caused by incomplete contact or too short contact time in the acquisition process of the traditional physiological signal acquisition device are solved, the situation that the sensor is not fully contacted with a user is reduced, and the three-axis acceleration sensor is adopted for acquiring the user signals, so that the limitation of the sensor to be perpendicular to the body is solved; the first triaxial acceleration sensor is used for self-adaptive filtering, so that the problem that the physiological signals are submerged by noise generated by a complex environment when a vehicle moves is solved, and the technical effect of extracting high-quality heart rate and respiratory frequency is achieved.
Drawings
Fig. 1 is a flowchart of a signal processing method according to a first embodiment of the present invention;
FIG. 1a is a schematic view of a vehicle according to a first embodiment of the present invention;
FIG. 1b is a schematic diagram of a signal processing method according to a first embodiment of the present invention;
fig. 1c is a block diagram of a signal processing apparatus according to a first embodiment of the present invention;
fig. 2 is a block diagram of a signal processing apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic view of a vehicle according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a signal processing method according to a first embodiment of the present invention, where the present embodiment is applicable to a situation where a vehicle user needs to perform physiological signal acquisition, the method may be applied to a vehicle, and the vehicle includes: the system comprises a safety belt, a signal processing device and a first triaxial acceleration sensor, wherein the signal processing device comprises: the second triaxial acceleration sensor, the signal processing equipment sets up on the safety belt, when the user wears the safety belt, the signal processing equipment is in user's chest position, first triaxial acceleration sensor sets up in the vehicle is inside, just first triaxial acceleration sensor with distance between the user is greater than preset distance, first triaxial acceleration sensor with signal processing equipment passes through the pencil and links to each other, signal processing equipment is used for carrying out signal processing method, specifically includes the following step:
Step S110, when the user wears the safety belt, user information is collected, where the user information includes: a physiological signal and a positional signal;
in an embodiment of the present invention, the signal processing apparatus includes: the second triaxial acceleration sensor, the signal processing equipment sets up on the safety belt, when the user wears the safety belt, signal processing equipment is in user's chest position, and the second triaxial acceleration sensor can consider to be in user's chest position and be used for gathering user information promptly to the physiological signal of high quality user is obtained in the convenience.
Fig. 1a is a schematic structural diagram of a vehicle according to a first embodiment of the present invention, as shown in fig. 1a, the vehicle may include: a signal processing device 1, a first triaxial acceleration sensor 2, a harness 3, a seat belt webbing 4 and a seat belt shoulder strap 5. A second triaxial acceleration sensor is included in the signal processing device 1 for acquiring user information. Wherein the first triaxial acceleration sensor 2 is used for collecting the environmental noise in the vehicle and transmitting the collected environmental noise in the vehicle to the signal processing device 1 through the wire harness 3. The belt shoulder strap 5 together with the harness 3 ensures that the signal processing device 1 is placed in front of the user's chest when the user wears the belt. The harness 3 may be a harness of adjustable length, the length of the harness being adjusted to ensure that the harness 3 is connected to the signal processing device 1 beyond the signal processing device 1 and at the overlapping portion of the belt shoulder strap 5 may be secured to or within the belt shoulder strap 5, for example, the portion of the harness 3 beyond the signal processing device 1 and at the belt shoulder strap 5 is woven into the belt shoulder strap 5; the portion of the harness 3 other than the belt shoulder belt 5 may be placed in a wiring manner inside the vehicle. The material and design of the belt shoulder strap 5 can be a material and design with relatively strong plasticity, and the signal processing device in front of the user's chest can be deepened to contact with the user's chest during the use process.
In the embodiment of the invention, the safety belt type signal processing equipment based on the vehicle is placed in front of the chest of the user to collect the user information, so that the user can collect the user information in the vehicle using process, and the situations that the sensor is not fully contacted with the user or the contact time is short in the user information collecting process are reduced.
In the embodiment of the invention, the user in the vehicle has autonomous consciousness, so that the uncertainty of the body of the user in the vehicle relative to the state of the safety belt type signal processing equipment, namely the movement track and the direction of the body of the user in the vehicle, are not judged in advance. Therefore, the triaxial acceleration sensor is adopted to collect acceleration components of the chest of the user on three coordinate axes, the method is suitable for a scene which is not judged in advance on the track and the direction of movement, the triaxial acceleration sensor is adopted to obtain a measurement space acceleration signal, and physiological signals and position signals of the user in the vehicle can be comprehensively and accurately collected.
In the embodiment of the invention, the acquired user information comprises physiological signals and position signals; the physiological signal may be a heartbeat signal, a respiration signal; collecting a position signal of the user, the position signal comprising: acceleration values in three directions.
In the embodiment of the invention, the heartbeat signal acquisition of the physiological signal of the user can be that the acceleration in the directions of the vertical coordinate axis, the horizontal coordinate axis and the front coordinate axis and the rear coordinate axis in the heartbeat process of the user can be periodically changed. In the action of the user's heart contraction, the vertical acceleration tends to decrease due to the excessive chest gravity center being depressed downward in the user's contracted chest, and then the vertical acceleration tends to increase due to the chest gravity center being raised during diastole. The user expands his chest during diastole and the acceleration in the horizontal direction tends to increase, after which the user compresses his chest during systole and the acceleration in the horizontal direction tends to decrease. The user expands his chest during diastole and accelerates in the fore-and-aft direction, and then compresses his chest during systole and accelerates in the fore-and-aft direction.
In the embodiment of the invention, the respiratory signal acquisition of the physiological signal of the user can be that the vertical acceleration, the horizontal acceleration, the front acceleration and the rear acceleration of the user are periodically changed in the respiratory process. In the respiratory motion, the vertical acceleration tends to increase due to the upward center of gravity of the chest during inspiration, and then tends to decrease due to the downward center of gravity of the chest during expiration. The user expands the chest during inspiration and the acceleration in the horizontal direction tends to increase, and then the user compresses the chest during expiration and the acceleration in the horizontal direction tends to decrease. The user expands his chest during inspiration and the acceleration in the fore-and-aft direction tends to increase, and then the user compresses his chest during vomiting and the acceleration in the fore-and-aft direction tends to decrease.
In the embodiment of the invention, the physiological signals of the user and the position signals of the user are collected at the same time, and it can be understood that the breathing signals and the heartbeat signals of the user in the vehicle always exist, and when the body position of the user in the vehicle is unchanged, namely the position signal change is negligible and cannot interfere with the physiological signals of the user; when the body position of the user in the vehicle changes, the position signal change obviously and the physiological signal are acquired by the second triaxial acceleration sensor. In order to obtain high quality heartbeat and respiration signals, it is necessary to determine from the acquired user information that the body position of the user is in motion relative to the belt-type signal processing device.
And step S120, determining the heart rate and the respiratory frequency of the user according to the physiological signals of the user and the position signals of the user.
In the embodiment of the invention, the second triaxial acceleration sensor in the signal processing equipment acquires the physiological signal of the user and the position signal of the user. And judging whether the quality of the physiological signal of the collected user is good or not according to the collected position signal of the user. If the acquired physiological signals of the user are poor in quality, further processing of the physiological signals of the user is not needed, and the position signals of the new user and the physiological signals of the new user are continuously acquired from the second triaxial acceleration sensor. If the position signal of the user judges that the acquired physiological signal of the user is good in quality, filtering processing and separation are carried out on the heartbeat signal and the respiratory signal in the physiological signal of the user. According to the waveforms of the separated heartbeat signals and the separated respiration signals of the user, the positions of two adjacent wave peaks are positioned to be determined to be one breath or one jump, and the heartbeat times and the respiration times in the preset time are calculated to determine the heart rate and the respiration frequency of the user.
Further, the signal processing method further includes: collecting a position signal of the user, wherein the position signal comprises: acceleration values in three directions; if the acceleration value in any direction is greater than or equal to the acceleration threshold value, determining that the user is in a non-stationary state; and if the acceleration values in the three directions are smaller than the acceleration threshold value, determining that the user is in a static state.
In the embodiment of the invention, whether the acceleration values acquired by the second triaxial acceleration sensor on three coordinate axes exceed the acceleration threshold value is judged according to the position signals in the acquired user information. The heartbeat signal and the breathing signal in the physiological signal in the acquired user information are floating and regular frequency changes of the chest position of the user, the change of the second triaxial acceleration sensor in the directions of three coordinate axes is limited, and if the body position of the user changes, the acceleration threshold value in all directions is exceeded. Therefore, whether the body position of the user is in a static state relative to the safety belt type signal processing equipment is judged according to the acceleration threshold value, so that the quality of the acquired physiological signals of the user is judged to be analyzed and processed.
In the embodiment of the invention, the acceleration threshold value to be compared between the acceleration values acquired by the second triaxial acceleration sensor on the three coordinate axes can be the acceleration threshold value calibrated according to the maximum value and the minimum value of the three coordinate acceleration values acquired by the triaxial acceleration sensor or by a test or index simulation method and the like in the normal breathing process and the heartbeat process of the human body.
Further, determining the heart rate and respiratory rate of the user from the physiological signal of the user and the position signal of the user comprises:
and if the user is in a static state, determining the heart rate and the respiratory rate of the user according to the physiological signals of the user.
In the embodiment of the invention, the body of the user and the safety belt type signal processing equipment are in a static state, the position signals in the acquired user information can be ignored, and when the physiological signal quality in the user information is good, the physiological signal in the user information needs to be further analyzed to obtain the heart rate and the respiratory rate corresponding to the user information.
Further, determining the heart rate and the respiratory rate of the user from the physiological signal of the user and the position signal of the user comprises:
When a user wears the safety belt, receiving the environmental noise acquired by the first triaxial acceleration sensor; if the user is in a static state according to the position signal of the user, filtering the physiological signal according to the environmental noise to obtain a target physiological signal; and carrying out band-pass filtering on the target physiological signal to obtain heart rate and respiratory rate.
In the embodiment of the invention, when a user wears the safety belt, the second triaxial acceleration sensor in the signal processing equipment acquires user information, and the first triaxial acceleration sensor arranged in the vehicle acquires an environmental noise signal in the vehicle. And transmitting the environmental noise signal in the vehicle acquired by the first triaxial acceleration sensor back to the signal processing equipment by the wire harness, and taking the environmental noise signal as a reference for acquiring user information adaptive filtering by the second triaxial acceleration sensor. And if the user is in a static state, performing self-adaptive filtering by taking the environmental noise signals in the vehicle collected by the first triaxial acceleration sensor as a reference after performing time sequence synchronization on the environmental noise signals collected at the same time, so as to obtain heartbeat signals and respiratory signals without the environmental noise signals.
Further, performing band-pass filtering on the target physiological signal to obtain a heart rate and a respiratory rate includes:
band-pass filtering the target physiological signal to obtain a heartbeat signal and a respiratory signal; determining a heart rate from the heartbeat signal; the respiratory frequency is determined from the respiratory signal.
In the embodiment of the invention, the heartbeat signal and the respiration signal with the environmental noise signals removed are obtained after self-adaptive filtering, so as to obtain the heart rate corresponding to the heartbeat signal and the respiration frequency corresponding to the respiration signal. The heartbeat signal and the respiratory signal need to be separated for targeted processing. According to the difference of bandpass of the frequency band to which the heartbeat signal and the respiratory signal belong, the filtering is required according to the bandpass corresponding to the frequency band to which the heartbeat signal and the respiratory signal belong. For example, consider that the normal breathing rate of the human body is 16-20 times/min, and the breathing signal is subjected to 0.1-0.5HZ band-pass filtering; taking into account that the normal heart rate of the human body is 60-100 times/min and harmonic, the heartbeat signal is subjected to 0.5-15HZ band-pass filtering. And respectively obtaining a heartbeat signal and a respiratory signal after bandpass filtering.
Further, determining the heart rate from the heartbeat signal includes: analyzing and fusing the heartbeat signals through principal components to obtain target heartbeat signals; taking absolute value of the target heartbeat signal and then carrying out Hilbert yellow transformation; and obtaining the heart rate in the preset time after the target heartbeat signal after the Hilbert yellow transformation is subjected to low-pass filtering.
In the embodiment of the invention, the physiological signals of the user are acquired by adopting the triaxial acceleration sensor to obtain acceleration signals in three coordinate axis directions, so that the three separated heartbeat signals need to be analyzed and fused through the main component to obtain the optimal heartbeat signal, namely the target heartbeat signal. Taking absolute value of the target heartbeat signal to positive the target signal so as to facilitate Hilbert yellow conversion to obtain an envelope signal, wherein the waveform of the envelope signal is similar to the waveform of a sine wave. And removing harmonic waves in the envelope signal by low-pass filtering the envelope signal wave after Hilbert yellow conversion. Typically, 3HZ low pass filtering is used to remove harmonics from the heartbeat signal. And (3) locating the wave crest position in the waveform of the envelope signal after removing the harmonic wave, representing one heartbeat by using the heartbeat interval of two adjacent wave crest positions, and calculating the heartbeat frequency of the user within the preset time. Typically, the preset time is 1 minute, i.e. the number of beats within 1 minute is the heart rate of the user.
Further, determining the respiratory rate from the respiratory signal comprises: the respiratory signals are subjected to principal component analysis and fusion to obtain target respiratory signals; and determining the respiratory frequency in the preset time according to the target respiratory signal.
In the embodiment of the invention, the physiological signals of the user are acquired by adopting the triaxial acceleration sensor to obtain acceleration signals in three coordinate axis directions, so that the three separated respiratory signals need to be analyzed and fused through the main components to obtain the optimal respiratory signal, namely the target respiratory signal. And positioning the wave crest position according to the target respiratory signal, representing one breath by using the respiratory interval of two adjacent wave crest positions, and calculating the respiratory frequency of the user in the preset time. Typically, the preset time is 1 minute, i.e. the number of breaths in 1 minute is the user's breathing rate.
Fig. 1b is a schematic diagram of a signal processing method according to the first embodiment of the present invention, and as shown in fig. 1b, the processing procedure of the signal processing method is specifically as follows:
according to the acceleration values in three directions in the position signals of the user acquired by the second triaxial acceleration sensor, judging whether the acceleration values in the three directions are larger than or equal to the acceleration threshold values in all directions, if the acceleration value in one direction is larger than or equal to the acceleration threshold value in the direction, the user and the information processing equipment are in a non-static state when the user information is acquired, and the acquired user information is not processed; if the acceleration values in the three directions are smaller than the acceleration threshold values in all directions, the user and the information processing equipment are in a static state when the user information is acquired, and signal processing is started on physiological signals of the user. And performing self-adaptive filtering by taking the environmental noise signal in the vehicle acquired by the first triaxial acceleration sensor as a reference signal to obtain a denoised user physiological signal. The user physiological signals after noise removal are subjected to band-pass filtering to separate heartbeat signals and respiratory signals of the user. The three heartbeat signals corresponding to the separated three axes of the user are analyzed and fused through the principal component to obtain a target heartbeat signal; taking absolute value of a target heartbeat signal to be positive, performing Hilbert yellow transformation to obtain a signal with an envelope waveform, performing low-pass filtering to remove harmonic, and calculating the heartbeat times, namely the heart rate, in a preset time by taking two adjacent peak position intervals as one heartbeat; and analyzing and fusing three respiratory signals corresponding to the separated three axes of the user through the principal component to obtain a target respiratory signal, and calculating the respiratory times, namely the respiratory frequency, in a preset time by using two adjacent wave peak positions as one breath.
In the embodiment of the invention, the second triaxial acceleration sensor acquires the user information and the first acceleration sensor environmental noise signal, and the user information acquired by the first triaxial acceleration sensor and the environmental noise signal acquired by the second triaxial acceleration sensor are required to be synchronized in time sequence by means of the synchronous AD acquisition module before the adjustable wire harness is transmitted back to the signal processing equipment, so that the signal time sequences acquired by the two acceleration sensors are completely consistent. If the acceleration value in one direction is greater than or equal to the acceleration threshold value in the direction, the user and the information processing equipment are in a non-static state when the user information is acquired, the quality of the acquired user information is poor, and the acquired user information can not be used for acquiring heart rate and respiratory rate signals of the user without the next filtering processing.
Fig. 1c is a block diagram of a signal processing device according to a first embodiment of the present invention, where, as shown in fig. 1c, the signal processing device includes a second triaxial acceleration sensor, a synchronous AD acquisition module, a data signal processing chip, a bluetooth module, a data storage module, and a power management module. The signal processing equipment comprises a second triaxial acceleration sensor which is used for acquiring user information; the synchronous AD acquisition module is used for carrying out time sequence synchronization on signals acquired by the first triaxial acceleration sensor and the second triaxial acceleration sensor; the data signal processing chip is used for extracting heart rate and respiratory rate in the user information; the Bluetooth module is used for establishing communication with other equipment to carry out data transmission; the data storage module is used for storing the acquired original user information, the user heartbeat signals and the respiratory signals after signal processing, and the heart rate and the respiratory frequency; and the power management module is used for displaying the current electric quantity of the signal processing equipment according to the electric quantity indicator lamp.
In the embodiment of the invention, the signals with completely consistent time sequence after being synchronized by the synchronous AD module acquisition module are transmitted to the digital signal chip, and the signal processing algorithm and the processing calculation amount are needed to be considered, so that the calculation capability of a common singlechip is insufficient, and the digital signal processing chip (DSP) is needed to be selected. The data signal processing chip comprises: adaptive filtering, three-axis sensor data fusion, and heart rate and respiratory rate extraction methods. The heart rate and the respiratory rate of the user are obtained after being processed by the digital signal processing chip, the heart rate and the respiratory rate of the user are saved by the data storage module, and saved data are called by the upper computer for display, for example, the waveform of the saved data signal is played and the frequency value is displayed; or the heart rate and the respiratory rate which are correspondingly extracted can be displayed in real time by connecting the Bluetooth module with a car machine or display equipment. The power management module is selected based on the data signal processing chip and can provide power for a power supply or an analog load directly attached to the printed circuit board. The power management module can remind a user to replace a battery or charge.
In the embodiment of the invention, the power management module can monitor the power consumption condition of the signal processing equipment and prompt by using the indicator lamp. When the user normally uses the signal processing device, the indicator lamp is displayed green if the amount of power supplied to the signal processing device is sufficient; if the amount of electricity supplied to the signal processing apparatus is weak or the indicator lamp which is not normally used by the signal processing apparatus is displayed in red, the battery needs to be replaced or charged immediately. The battery can be charged through the wire harness in various modes, and the battery can be detached for connectionless charging. The normal use signal processing device indicator light may continue to be displayed as a red-green color mixture while charging is performed by the wire harness, or the normal use indicator light of the charging mode stop signal processing device may be displayed as red Huang Hunse.
The invention collects user information when a user wears the safety belt through the safety belt, the signal processing equipment and the first triaxial acceleration sensor in the vehicle; the signal processing apparatus includes: the signal processing device is positioned at the chest position of the user when the user wears the safety belt, the first triaxial acceleration sensor is arranged in the vehicle, the distance between the first triaxial acceleration sensor and the user is larger than the preset distance, the first triaxial acceleration sensor is connected with the signal processing device through a wire harness, and user information is collected when the user wears the safety belt; the user information includes: a physiological signal and a positional signal; determining the heart rate and the respiratory rate of the user according to the physiological signal of the user and the position signal of the user. The problems of unstable acquired physiological signals and poor accuracy caused by incomplete contact or too short contact time in the acquisition process of the traditional physiological signal acquisition device are solved, the situation that the sensor is not fully contacted with a user is reduced, and the three-axis acceleration sensor is adopted for acquiring the user signals, so that the limitation of the sensor to be perpendicular to the body is solved; and the first triaxial acceleration sensor is used for self-adaptive filtering, so that the problem that the physiological signals are submerged by noise generated by a complex environment when a vehicle moves is solved, and the technical effects of high-quality heart rate and respiratory frequency are obtained.
Example two
Fig. 2 is a block diagram of a signal processing apparatus according to a second embodiment of the present invention, and the embodiment of the present invention further provides a signal processing apparatus, where the signal processing apparatus includes:
the collection module 21 is configured to collect user information when the user wears the seat belt, where the user information includes: a physiological signal and a positional signal;
a frequency determination module 22 for determining the heart rate and the breathing frequency of the user from the physiological signal of the user and the position signal of the user.
Further, the acquisition module is specifically configured to: collecting a position signal of the user, wherein the position signal comprises: acceleration values in three directions; if the acceleration value in any direction is greater than or equal to the acceleration threshold value, determining that the user is in a non-stationary state; and if the acceleration values in the three directions are smaller than the acceleration threshold value, determining that the user is in a static state.
Further, the frequency determining module 22 is specifically configured to:
and if the user is in a static state, determining the heart rate and the respiratory rate of the user according to the physiological signals of the user.
Further, the frequency determining module 22 is specifically configured to:
When a user wears the safety belt, receiving the environmental noise acquired by the first triaxial acceleration sensor; if the user is in a static state according to the position signal of the user, filtering the physiological signal according to the environmental noise to obtain a target physiological signal;
and carrying out band-pass filtering on the target physiological signal to obtain heart rate and respiratory rate.
Further, the frequency determining module 22 is specifically configured to:
band-pass filtering the target physiological signal to obtain a heartbeat signal and a respiratory signal;
determining a heart rate from the heartbeat signal;
the respiratory frequency is determined from the respiratory signal.
Further, the frequency determining module 22 is specifically configured to:
analyzing and fusing the heartbeat signals through principal components to obtain target heartbeat signals;
taking absolute value of the target heartbeat signal and then carrying out Hilbert yellow transformation;
and obtaining the heart rate in the preset time after the target heartbeat signal after the Hilbert yellow transformation is subjected to low-pass filtering.
Further, the frequency determining module 22 is specifically configured to:
the respiratory signals are subjected to principal component analysis and fusion to obtain target respiratory signals;
and determining the respiratory frequency in the preset time according to the target respiratory signal.
The signal processing device provided by the embodiment of the invention can execute the signal processing method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example III
Fig. 3 is a schematic structural diagram of a vehicle according to a third embodiment of the present invention. FIG. 3 illustrates a block diagram of an exemplary vehicle 12 suitable for use in implementing embodiments of the present invention. The vehicle 12 shown in fig. 3 is merely an example and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.
As shown in fig. 3, the vehicle 12 is embodied in the form of a general purpose computing device. Components of the vehicle 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.
Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, and a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, micro channel architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
The vehicle 12 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by the vehicle 12 and includes both volatile and non-volatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and/or cache memory 32. The vehicle 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 3, commonly referred to as a "hard disk drive"). Although not shown in fig. 3, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods of the embodiments described herein.
The vehicle 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), one or more devices that enable a user to interact with the vehicle 12, and/or any devices (e.g., network card, modem, etc.) that enable the vehicle 12 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. Also, the vehicle 12 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through a network adapter 20. As shown, network adapter 20 communicates with other modules of the network device 12 over bus 18. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with the vehicle 12, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, for example, implementing a signal processing method provided by an embodiment of the present invention, the method including:
collecting user information when a user wears the safety belt, wherein the user information comprises: a physiological signal and a positional signal; determining the heart rate and the respiratory rate of the user according to the physiological signal of the user and the position signal of the user.
Example IV
A fourth embodiment of the present invention also provides a computer-readable storage medium storing a computer program for executing a signal processing method when executed by a processor, applied to a vehicle, the vehicle including: the system comprises a safety belt, a signal processing device and a first triaxial acceleration sensor, wherein the signal processing device comprises: the second triaxial acceleration sensor, the signal processing equipment sets up on the safety belt, when the user wears the safety belt, the signal processing equipment is in user's chest position, first triaxial acceleration sensor sets up in the vehicle is inside, just first triaxial acceleration sensor with distance between the user is greater than preset distance, first triaxial acceleration sensor with signal processing equipment passes through the pencil and links to each other, the signal processing equipment is used for carrying out signal processing method, the method includes:
Collecting user information when a user wears the safety belt, wherein the user information comprises: a physiological signal and a positional signal;
determining the heart rate and the respiratory rate of the user according to the physiological signal of the user and the position signal of the user.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A signal processing method, characterized by being applied to a vehicle, the vehicle comprising: the safety belt, signal processing device, first triaxial acceleration sensor, wherein, signal processing device includes: the second triaxial acceleration sensor, the signal processing equipment sets up on the safety belt, when the user wears the safety belt, the signal processing equipment is in user's chest position, first triaxial acceleration sensor sets up in the vehicle is inside, just first triaxial acceleration sensor with distance between the user is greater than preset distance, first triaxial acceleration sensor with signal processing equipment passes through the pencil and links to each other, signal processing equipment is used for carrying out the signal processing method, the method includes:
Collecting user information when a user wears the safety belt, wherein the user information comprises: a physiological signal and a position signal, the position signal comprising: acceleration values in three directions; if the acceleration value in any direction is greater than or equal to the acceleration threshold value, determining that the user is in a non-stationary state; if the acceleration values in the three directions are smaller than the acceleration threshold value, determining that the user is in a static state;
determining heart rate and respiratory rate of the user from the physiological signal of the user and the position signal of the user, comprising: if the user is in a static state, determining the heart rate and the respiratory rate of the user according to the physiological signal of the user;
wherein determining the heart rate and respiratory rate of the user from the physiological signal of the user and the position signal of the user comprises:
when a user wears the safety belt, receiving the environmental noise acquired by the first triaxial acceleration sensor;
if the user is in a static state according to the position signal of the user, filtering the physiological signal according to the environmental noise to obtain a target physiological signal;
band-pass filtering the target physiological signal to obtain heart rate and respiratory rate;
Wherein the physiological signal comprises a heartbeat signal and a respiration signal; the heartbeat signal and the respiration signal are respectively the periodic changes of the vertical acceleration, the horizontal acceleration, the front acceleration and the rear acceleration in the heartbeat process and the respiration process; the position signal is the acceleration value of the heartbeat signal and the respiration signal in the vertical direction, the horizontal direction and the front and back direction respectively in the heartbeat process and the respiration process.
2. The method of claim 1, wherein band-pass filtering the target physiological signal to obtain heart rate and respiratory rate comprises:
band-pass filtering the target physiological signal to obtain a heartbeat signal and a respiratory signal;
determining a heart rate from the heartbeat signal;
the respiratory frequency is determined from the respiratory signal.
3. The method of claim 2, wherein determining the heart rate from the heartbeat signal comprises:
analyzing and fusing the heartbeat signals through principal components to obtain target heartbeat signals;
taking absolute value of the target heartbeat signal and then carrying out Hilbert yellow transformation;
and obtaining the heart rate in the preset time after the target heartbeat signal after the Hilbert yellow transformation is subjected to low-pass filtering.
4. The method of claim 2, wherein determining the respiratory rate from the respiratory signal comprises:
The respiratory signals are subjected to principal component analysis and fusion to obtain target respiratory signals;
and determining the respiratory frequency in the preset time according to the target respiratory signal.
5. A signal processing apparatus, characterized by being applied to a vehicle, the vehicle comprising: the safety belt, signal processing device, first triaxial acceleration sensor, wherein, signal processing device includes: the second triaxial acceleration sensor, signal processing equipment sets up on the safety belt, when the user wears the safety belt, signal processing equipment is in user's chest position, first triaxial acceleration sensor sets up in the vehicle is inside, just first triaxial acceleration sensor with distance between the user is greater than preset distance, first triaxial acceleration sensor with signal processing equipment passes through the pencil and links to each other, signal processing device set up in signal processing equipment, signal processing device includes:
the acquisition module is used for acquiring user information when a user wears the safety belt, wherein the user information comprises: a physiological signal and a position signal, the position signal comprising: acceleration values in three directions; if the acceleration value in any direction is greater than or equal to the acceleration threshold value, determining that the user is in a non-stationary state; if the acceleration values in the three directions are smaller than the acceleration threshold value, determining that the user is in a static state;
A frequency determination module for determining heart rate and respiratory frequency of the user from the physiological signal of the user and the position signal of the user, comprising: if the user is in a static state, determining the heart rate and the respiratory rate of the user according to the physiological signal of the user;
the step of carrying out band-pass filtering on the target physiological signal to obtain a heartbeat signal and a respiratory signal comprises the following steps:
determining a heart rate from the heartbeat signal;
determining a respiratory frequency from the respiratory signal;
wherein the physiological signal comprises a heartbeat signal and a respiration signal; the heartbeat signal and the respiration signal are respectively the periodic changes of the vertical acceleration, the horizontal acceleration, the front acceleration and the rear acceleration in the heartbeat process and the respiration process; the position signal is the acceleration value of the heartbeat signal and the respiration signal in the vertical direction, the horizontal direction and the front and back direction respectively in the heartbeat process and the respiration process.
6. A vehicle, characterized in that the vehicle comprises:
one or more processors;
storage means for storing one or more programs,
when executed by the one or more processors, causes the one or more processors to implement the signal processing method of any of claims 1-4.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the signal processing method according to any one of claims 1-4.
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| CN113545765B (en) * | 2021-07-16 | 2024-04-09 | 厦门硅田系统工程有限公司 | Continuous heart rate output method of heart rate measuring device and heart rate measuring device |
| CN113693578A (en) * | 2021-08-26 | 2021-11-26 | 中国第一汽车股份有限公司 | Heart rate estimation method, device, equipment, system and storage medium |
| CN114601432A (en) * | 2022-01-28 | 2022-06-10 | 中国第一汽车股份有限公司 | Vehicle-mounted human body information acquisition method and device and vehicle |
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