Intelligent pillow capable of improving sleep quality

Abstract

The invention discloses an intelligent pillow capable of reducing misjudgment, achieving multi-factor adjustment and improving sleep quality. The intelligent pillow comprises a pillow body, an air bag array unit, a piezoresistive sensing unit, a sound collecting unit, an audio playing unit, a pulse negative ion unit and a central control unit, the airbag array unit comprises a plurality of airbags and an airbag control module for controlling the airbags to be inflated and deflated; the piezoresistive sensing unit comprises a plurality of piezoresistive sensors located below the air bag. The sound acquisition unit comprises two microphones; the audio playing unit comprises an audio module and a loudspeaker; the pulse negative ion unit comprises a negative ion generator; the central control unit is electrically connected with the air bag control module, the piezoresistive sensor, the microphone, the audio module and the negative ion generator and controls the air bag control module to work when a detection value of the piezoresistive sensor unit meets a first threshold value and a detection value of the microphone reaches a second threshold value. And when the microphone detection value is lower than a second threshold value, the audio module and the negative ion generator are controlled to work at the same frequency.

Description

Technical Field

[0001] The present invention relates to the technical field of sleep monitoring, and in particular to a smart pillow for improving sleep quality. Background Art

[0002] Good sleep plays an important role in maintaining physical and mental health. It has many advantages, such as promoting physiological repair and growth and development, optimizing brain function, regulating emotions and mental health, improving immunity and preventing diseases, etc., which helps to improve human health. There are many factors that affect sleep quality, such as the problem of slow falling asleep due to bad mood, poor sleep quality caused by breathing disorders such as snoring and poor air quality, and neck pain caused by the incompatibility between the pillow and the neck. Therefore, the improvement of sleep quality depends on the synergistic effect of many aspects. A Chinese utility model patent (CN221691580U) discloses an anti-snoring pillow, which is equipped with a piezoelectric sensor, a piezoresistive sensor, a sound sensor and an airbag group in the pillow. It determines whether the user is snoring during sleep through the sound, the pressure on the pillow and the user's physiological data, and adjusts the user's posture by controlling the airbag in the pillow to achieve the purpose of stopping snoring. However, the aforementioned anti-snoring pillow uses components such as piezoelectric sensors to determine the user's sleep status based on physiological data. This increases the cost of the pillow. Furthermore, because the piezoelectric sensor is housed inside the pillow and doesn't come into direct contact with the user's body, the physiological data detected by the piezoelectric sensor exhibits significant errors, making it difficult to accurately reflect the user's sleep status. Consequently, when combining sound and pillow pressure to determine the user's sleep status, misjudgments are likely to occur, disrupting the user's sleep. Furthermore, because sleep is influenced by many factors, the aforementioned anti-snoring pillow can only improve the user's sleep by stopping snoring, resulting in insufficient sleep improvement. Summary of the Invention

[0003] Based on this, it is necessary to provide a smart pillow that improves sleep quality in response to the above-mentioned shortcomings, which can reduce the misjudgment of the user's sleep and improve sleep quality by adjusting multiple factors.

[0004] A smart pillow for improving sleep quality, comprising a pillow body and an airbag array unit, a piezoresistive sensing unit, a sound collection unit, an audio playback unit, a pulsed negative ion unit, and a central control unit housed in the pillow body;

[0005] The airbag array unit includes a plurality of airbags arranged side by side and spaced apart along the length direction of the pillow body, and an airbag control module for controlling the inflation and deflation of each airbag;

[0006] The piezoresistive sensing unit includes a plurality of piezoresistive sensors arranged side by side and spaced apart along the length direction of the pillow body and located below the airbag;

[0007] The sound collection unit includes two microphones arranged at intervals;

[0008] The audio playback unit includes an audio module and a speaker electrically connected to the audio module;

[0009] The pulse negative ion unit includes a negative ion generator;

[0010] The central control unit is electrically connected to the airbag control module, the piezoresistive sensor, the microphone, the audio module and the negative ion generator;

[0011] The central control unit controls the airbag control module to operate when the detection value of the piezoresistive sensing unit meets the first threshold and the detection value of the microphone reaches the second threshold, so as to inflate and deflate the airbag and shake the user's head to stop snoring; the central control unit controls the audio module to operate to play audio when the detection value of the microphone is lower than the second threshold, and the central control unit controls the negative ion generator to operate at the same frequency as the audio played by the speaker to release negative ions.

[0012] In one embodiment, selecting the detection value of the piezoresistive sensing unit includes the following steps:

[0013] Take the mean square error of the piezoresistive data of each piezoresistive sensor and calculate its average value as the standard average value;

[0014] Selecting a plurality of consecutive piezoresistive sensors whose mean square deviation average value is greater than a standard average value as samples;

[0015] The piezoresistive sensor with the middle number in the sample is selected as the center point of contact between the head and the pillow;

[0016] The piezoresistive data of the center point piezoresistive sensor is taken as the detection value of the piezoresistive sensing unit.

[0017] In one embodiment, the first threshold is R1-R2. When the detection value of the airbag array unit is less than R1, it is determined that the user's head is not in contact with the pillow; when the detection value of the airbag array unit is greater than R2, it is determined that the user's head is in contact with the pillow and is in a non-sleeping state; when the detection value of the airbag array unit is between R1 and R2, it is determined that the user's head is in contact with the pillow and is in a sleeping state.

[0018] When the detection value of the airbag array unit is between R1-R2, it is determined whether the change frequency of the center point piezoresistive sensor number exceeds the third threshold. If it does not exceed the third threshold, it is determined that the user is in a deep sleep state; if it exceeds the third threshold, it is determined that the user is in a light sleep state.

[0019] In one embodiment, when the detection value of the microphone is lower than a second threshold, it is determined that the user is not snoring; when the detection value of the microphone is greater than or equal to the second threshold, the degree of snoring is determined by an AI model.

[0020] In one embodiment, the central control unit controls the smart pillow to enter the first control mode, the second control mode, the third control mode, and the fourth control mode according to the detection value of the piezoresistive sensing unit and the snoring status signal of the user detected by the microphone;

[0021] In the first control mode, the central control unit determines that the user is not asleep and not snoring within a preset time, and the central control unit controls the audio module and the negative ion generator to operate;

[0022] In the second control mode, the central control unit determines that the user has not fallen asleep and is not snoring after a preset time, and the central control unit controls the audio module and the negative ion generator to operate, and at the same time controls the airbag control module to operate to massage the user's neck;

[0023] In the third control mode, the central control unit determines that the user is asleep and snoring, and controls the airbag to shake according to the user's snoring level to stop snoring;

[0024] In the fourth control mode, the central control unit determines that the user is asleep and not snoring, and the central control unit controls the audio module and the negative ion generator to operate.

[0025] In one embodiment, the audio playback unit includes two speakers electrically connected to the audio module, the audio module controls one speaker to play audio at a first frequency, and the audio module controls the other speaker to play audio at a second frequency, and the difference between the first frequency and the second frequency is greater than 0; the pulse negative ion unit includes two negative ion generators, one negative ion generator operates at a first frequency to release negative ions, and the other negative ion generator operates at a second frequency to release negative ions.

[0026] In one embodiment, in the first control mode, the second control mode and the light sleep state, the operating frequency difference between the two speakers controlled by the audio module is 6 Hz; in the fourth control mode and the deep sleep state, the operating frequency difference between the two speakers controlled by the audio module is 2 Hz.

[0027] In one embodiment, two negative ion generators are disposed on the outside of the paper cones of the two speakers in a one-to-one correspondence.

[0028] In one embodiment, the airbag control module is a brushless air pump that is electrically connected to the central control unit and inflates and deflates each airbag through forward and reverse rotation. Each airbag is provided with a solenoid valve that is electrically connected to the central control unit. The central control unit controls the brushless air pump to operate according to a preset forward and reverse frequency, and opens the solenoid valve of one or more airbags, so that the airbag shakes to interfere with the user's snoring, or makes the airbag massage the user's neck.

[0029] In one embodiment, at least one piezoresistive sensor is provided under each airbag. When the mean square error of the piezoresistive data of a piezoresistive sensor is less than the standard average value and the difference between the two is greater than a fourth threshold value, the central control unit controls the solenoid valve corresponding to the airbag above the piezoresistive sensor to open and controls the brushless air pump to inflate.

[0030] The smart pillow for improving sleep quality implemented in the present invention collects the user's snoring by setting two microphones, which can effectively monitor snoring sounds at a long distance and improve the reliability and sensitivity of snoring sound collection; by setting a first threshold and a second threshold to judge the user's sleeping condition and snoring condition, the influence of the sleeping environment on the judgment of the user's sleeping condition and snoring condition can be eliminated, reducing the possibility of misjudgment. On the one hand, it improves the accuracy and reliability of the judgment of the user's sleeping condition and snoring condition; on the other hand, it replaces the piezoelectric sensor with algorithm judgment, which is conducive to reducing the cost of the smart pillow; while intervening in the user's snoring through airbag adjustment, it also soothes the user's nerves from the aspects of hearing and smell through audio playback and negative ion release, adopts multi-faceted adjustment to improve the user's sleep and improve the user's sleep quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A top view of a smart pillow according to an embodiment of the present invention;

[0032] Figure 2 A side view of a smart pillow according to an embodiment of the present invention;

[0033] Figure 3 A reference diagram of a smart pillow in use according to an embodiment of the present invention;

[0034] Figure 4 This is a module connection diagram of a smart pillow in one embodiment of the present invention;

[0035] Figure 5 1. A circuit module diagram of a smart pillow according to an embodiment of the present invention;

[0036] Figure 6 This is a logic judgment diagram of a smart pillow in one embodiment of the present invention;

[0037] Figure 7 is a typical frequency response curve of a loudspeaker in one embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the principle of collecting sound signals with two microphones in one embodiment of the present invention. DETAILED DESCRIPTION

[0039] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] The present invention discloses a smart pillow that improves sleep quality. While fulfilling its basic function of supporting the user's neck, the smart pillow also intervenes in the user's snoring by inflating and deflating the airbag. At the same time, it soothes the user's nerves through both hearing and smell through audio playback and negative ion release, thereby improving the user's sleep quality. Figure 1-6 The smart pillow of this embodiment includes a pillow body 100 and an airbag array unit 200, a piezoresistive sensing unit, a sound collection unit, an audio playback unit 300, a pulse negative ion unit and a central control unit 400 contained in the pillow body 100. The pillow body 100 is provided with a cavity, the airbag array unit 200, the piezoresistive sensing unit, the sound collection unit, the audio playback unit 300, the pulse negative ion unit and the central control unit 400 (i.e. Figure 5 The CPU in the pillow body 100 is arranged in the cavity. The airbag array unit 200 includes a plurality of airbags 210 arranged side by side and spaced apart along the length direction of the pillow body 100, and an airbag control module 220 for controlling the inflation and deflation of each airbag 210. The piezoresistive sensing unit includes a plurality of piezoresistive sensors 500 arranged side by side and spaced apart along the length direction of the pillow body 100 and located below the airbags 210. The piezoresistive sensors 500 are provided to detect the pressure exerted on the parts of the airbags 210 on the pillow body 100, so that the central control unit 400 can judge the user's sleeping situation and adjust the airbag control module 220 according to the detection value feedback of the piezoresistive sensors 500, thereby adjusting the air pressure in the airbag 210 to support the user's neck or intervene in the user's snoring. The sound collection unit includes two microphones 600 (i.e. Figure 5mic1 and mic2 in the pillow body 100), in this embodiment, the two microphones 600 are spaced apart along the length direction of the pillow body 100. The audio playback unit 300 includes an audio module 310 and a speaker 320 electrically connected to the audio module 310. When the audio module 310 is working, the electrical signal corresponding to the preset audio content is transmitted to the speaker 320, and the speaker 320 converts the electrical signal into a sound signal and plays it to provide music for the user. The pulse negative ion unit includes a negative ion generator 700. The negative ion generator 700 generates negative ions after being energized. These negative ions combine with dust and particles in the air, causing the dust or particles to be charged and adsorbed and aggregated before settling, thereby reducing dust particles in the air. At the same time, negative ions can also attach to the surface of microorganisms (bacteria, viruses, mold spores), and by destroying their cell membrane structure or interfering with their bioelectric activity, inhibit their activity or reproduction ability to a certain extent, thereby playing a bactericidal role. In addition, negative ions can also react with certain odorous molecules (such as ammonia and hydrogen sulfide) or some small molecule volatile organic compounds in the air, causing them to decompose, oxidize, or polymerize, thereby reducing odors and improving the user's sleeping environment to promote sleep. The central control unit 400 is electrically connected to the airbag control module 220, the piezoresistive sensor 500, the microphone 600, the audio module 310, and the negative ion generator 700 to control the operation of the airbag control module 220, the piezoresistive sensor 500, the microphone 600, the audio module 310, and the negative ion generator 700.

[0041] In this embodiment, the central control unit 400 controls the airbag control module 220 to operate when the detection value of the piezoresistive sensing unit meets the first threshold and the detection value of the microphone 600 reaches the second threshold, causing the airbag 210 to inflate and deflate and rock the user's head to stop snoring. It can be understood that when the detection value of the piezoresistive sensing unit meets the first threshold and the detection value of the microphone 600 reaches the second threshold, the central control unit 400 determines that the user is asleep and snoring. In this case, the user's head can be rocked to stop snoring by adjusting the air pressure in the airbag 210. When the detection value of the microphone 600 is below the second threshold, the central control unit 400 controls the audio module 310 to operate to play audio, and the central control unit 400 controls the negative ion generator 700 to operate at the same frequency as the audio played by the speaker 320 to release negative ions. When the detection value of microphone 600 is lower than the second threshold, the user may be in a state of not falling asleep or not snoring after falling asleep. In this case, the user's nerves can be relaxed by releasing negative ions while playing audio, so that the user can fall asleep as soon as possible; or the user can be further promoted to enter a deep sleep by playing audio and releasing negative ions, so as to improve the user's sleep quality.

[0042] The upper surface of the pillow body 100 is a deformable soft surface, and a support portion for supporting the user's neck is formed on the soft surface. The airbag array unit 200 and the piezoresistive sensing unit are both located below the support portion. In this way, when the user's neck contacts the pillow body 100, the upper surface of the pillow body 100 deforms under the pressure of the neck, so that the piezoresistive sensing unit can collect the pressure applied by the user to the pillow body 100, so as to determine whether the user has fallen asleep; at the same time, when the airbag array unit 200 is actuated by the central control unit 400, the deformation caused by the inflation and deflation of the airbag 210 can act on the user's neck through the soft surface to adjust the force acting on the user's neck, thereby achieving the purpose of supporting the user's neck or shaking the user's neck. In addition, the design of the pillow body 100 must satisfy the following requirements: when the sound collection unit, audio playback unit 300, and pulse negative ion unit are housed within the cavity, the sound collection unit can collect sound signals outside the pillow body 100, the audio played by the audio playback unit 300 can be heard by the user through the pillow body 100, and the negative ions released by the pulse negative ion unit can pass through the pillow body 100 and come into contact with the external environment. Preferably, at least a portion of the pillow body 100 has a plurality of mesh holes connecting the inside and outside of the pillow body 100. These mesh holes can be formed by pores in a pillowcase covering the surface of the pillow body 100 and corresponding to the openings in the pillow body 100, or by opening small holes in the surface of the pillow body 100.

[0043] The airbag 210 is used to provide support for the user's neck and to slide the user's neck through changes in air pressure, thereby preventing snoring. In this embodiment, the bottom of the airbag 210 is connected to the inner bottom surface of the pillow body 100. For example, the bottom of the airbag 210 is fixed to the inner bottom surface of the pillow body 100 by bonding to achieve the positioning of the airbag 210. The multiple airbags 210 are arranged side by side and spaced apart to achieve independent control of the air pressure within each airbag 210. In one embodiment, each airbag 210 is an independent structure, and the multiple airbags 210 are respectively fixed to the inner bottom surface of the pillow body 100. In another embodiment, multiple airbags 210 are integrally formed. A long strip of airbag can be provided, and a portion of the upper surface of the airbag is sealed together with a corresponding portion on the lower surface by hot pressing. After multiple hot pressing operations, the airbag can be separated into multiple airbags 210 that are arranged side by side and independently spaced. In this way, the positioning of each airbag 210 can be achieved by only fixing a portion of the airbag to the inner bottom surface of the pillow body 100.

[0044] In this embodiment, the airbag control module 220 is a brushless air pump (ie, a brushless air pump) that is electrically connected to the central control unit 400 and inflates and deflates the airbags 210 by rotating forward and reverse. Figure 5The brushless air pump includes a brushless DC motor, an electronic commutator, a pump body, a piston housed in the pump body, and an air chamber valve. The rotor of the brushless DC motor is a permanent magnet (neodymium magnet), and its stator is a plurality of coils. When the brushless DC motor is working, its rotor rotates relative to the stator. The electronic commutator detects the rotor position and controls the current direction through the Hall sensor. During the rotation of the rotor, the output shaft of the brushless DC motor rotates, and the piston converts the rotational motion of the motor into linear reciprocating motion and compresses the gas in the pump body. The air chamber valve is a one-way valve for controlling the flow direction of the gas. When the air chamber valve is an inlet valve, the gas in the pump body can only enter but not exit. When the air chamber valve is an exhaust valve, the gas in the pump body can only exit but not enter. In this way, the central control unit 400 (i.e. Figure 5 The CPU in the brushless air pump can control the direction of the current in the brushless DC motor by controlling the electronic commutator, thereby controlling the direction of the brushless DC motor and the filling and deflation of the pump body to increase or decrease the air pressure in the airbag 210. It should be noted that in this embodiment, the output end of the brushless air pump is provided with a pipe connecting each airbag one by one, so that each airbag 210 can be controlled separately. Each airbag is provided with a solenoid valve (i.e., a solenoid valve) electrically connected to the central control unit 400. Figure 5 The central control unit 400 controls the brushless air pump to operate at a preset forward and reverse frequency and opens the solenoid valves of one or more airbags 210, causing the airbags to shake and wake the user, thereby preventing snoring, or to massage the user's neck. The central control unit 400 controls the operation of the brushless air pump and the opening and closing of each solenoid valve to achieve zoned inflation or inhalation of air from the airbag array unit 200.

[0045] In addition, in the present embodiment, the reason why the central control unit 400 controls the negative ion generator 700 to operate at the same frequency as the audio played by the speaker 320 is to achieve intermittent pulse triggering of the negative ion generator 700 to reduce the ozone generated during the operation of the negative ion generator 700. Specifically, the working process of the negative ion generator 700 is derived from the ionization effect of the high-voltage electric field on the air components. The high-voltage electric field generates a corona discharge on the air, so that the air is ionized to form negative ions. During the corona discharge process, the strong electric field near the high-voltage electrode ionizes the air molecules, and the oxygen molecules may decompose and recombine under the action of high-energy electrons, thereby producing ozone. Since negative ions are beneficial to the human body and ozone is harmful to the human body, it is necessary to control the amount of ozone produced. The traditional negative ion generator 700 uses a continuous ionization method to excite negative ions. Ozone is easily generated in this process, making the negative ion environment formed by the negative ion generator 700 not user-friendly.

[0046] In this embodiment, the negative ion generator 700 is controlled by the central control unit 400 to operate at the same frequency as the audio played by the speaker 320, and intermittent high-voltage pulses are used instead of continuous DC high voltage. The pulsed electric field technology is used to precisely control the pulse frequency and pulse width to reduce the continuous discharge time, inhibit ozone generation and reduce ozone accumulation. In addition, bipolar pulses (alternating positive and negative) or special electrode materials (such as carbon fiber) can be used to further reduce the amount of ozone generated. In this solution, in order to achieve the effect of music on the user's sleep, the vibration frequency of the audio played by the audio module 310 is below 400Hz, that is, the vibration frequency of the sleep-aiding brainwave music is mostly concentrated below 400Hz. Figure 7 The typical frequency response curve of the speaker 320 is shown. It can be seen that when the frequency response value is below 400 Hz, it is low. Accordingly, the stimulation to the user's nerves can be reduced to achieve a sleep-aiding effect. The vibration frequency can also trigger the negative ion generator 700 to ensure the normal operation of the negative ion generator 700. In this embodiment, the audio module 310 is integrated into the CPU, and the audio playback unit 300 also includes an amplifier (i.e., an amplifier) ​​electrically connected to the audio module 310. Figure 5 The AMP in the figure is used to drive the speaker 320 to amplify the sound signal.

[0047] In addition, please combine Figure 1-8 In this embodiment, two microphones 600 (i.e. Figure 8 1 and 2). This is because, in actual use, there are generally two pillows on the bed, and the user may place the two pillows left and right. Therefore, it is necessary to locate the snoring sound detected by microphone 600. Specifically, in this embodiment, central control unit 400 determines the location of the snoring sound based on TDOA technology. TDOA (Time Difference of Arrival) technology is a positioning technology based on signal propagation time difference. It measures the time difference between the signal from the target source to multiple receivers and, combined with the known positions of the receivers, calculates the spatial coordinates of the target source. For example, in this embodiment, there is a sound source 1 on the pillow body on which the user rests, and there is a sound source 2 on the adjacent pillow. The distances A and B from the sound source 1 to mic1 and mic2 have maximum and minimum values ​​respectively, and the distances from the sound source 2 to mic1 and mic2 are A' and B'. According to the time difference between mic1 and mic2 receiving the snoring sound, it can be determined that when the distance between A and A' is greater than the distance D between mic1 and mic2, or the distance between B and B' is greater than the distance D between mic1 and mic2, the snoring sound does not come from the pillows where mic1 and mic2 are located. In this way, by forming an array with two mics, snoring sounds can be effectively monitored at a long distance.

[0048] Please combine Figure 5 In this embodiment, the sound collection unit further includes a first analog-to-digital converter (Analog-to-Digital Converter) electrically connected to mic1 and mic2, that is, Figure 5 ADC1 in the first analog-to-digital converter and the central control unit 400 (ie Figure 5 A digital signal processing module (i.e. a CPU in a circuit) electrically connected to the Figure 5 The DSP in the DSP is a digital signal processing module that has been trained with an AI model. The sound signals collected by mic1 and mic2 are transmitted to the digital signal processing module (DSP) via the first analog-to-digital converter. The digital signal processing module (DSP) converts the snoring sound signal into a frequency domain signal through Fourier transform (i.e., converting the signal from the time domain to the frequency domain (analyzing the spectral components) through Fourier transform (FFT / DFT)). The MFCC vector of the frequency domain in each speech segment is then extracted. The AI-trained similarity model is then used to compare the Mel-frequency cepstral coefficient vector with a pre-confirmed snoring sample vector to identify snoring.

[0049] Furthermore, when the detection value of the microphone 600 is lower than the second threshold, it is determined that the user is not snoring; when the detection value of the microphone 600 is greater than or equal to the second threshold, the degree of snoring is determined by the AI ​​model. Preferably, in this embodiment, the second threshold is 35db, and a value lower than 35db is considered to be a normal breathing sound, and the user is determined not to be snoring, so as to reduce the impact of environmental noise on the recognition and judgment of the user's snoring. When it reaches 35db, it is determined that the user is snoring, and the snoring judgment is performed by the DSP trained by the AI ​​model. In this way, the sound signal greater than 35db enters the DSP, and the degree of snoring is judged and classified by the AI ​​model judgment method, which is generally divided into three categories: low, medium and high, namely mild snoring, moderate snoring and severe snoring.

[0050] In one embodiment, the piezoresistive sensor 500 of the piezoresistive sensing unit is divided into zones, and each zone (i.e. Figure 2 Block1, Block2 ... Block16) has a piezoresistive sensor 500, and each of the 8 partitioned piezoresistive sensors 500 is connected to a second analog-to-digital converter (i.e. Figure 5 ADC2 in the figure), multiple second analog-to-digital converters are cascaded in sequence, and the first second magic converter is electrically connected to the central control unit 400. In this way, the multiple second analog-to-digital converters (ADC2) are quickly linked through the cascade method. The first second analog-to-digital converter (ADC2) is connected to the central control unit 400 (CPU), which can effectively realize the instant transmission of multiple piezoresistive values ​​with less IO port occupation.

[0051] Furthermore, the selection of the detection value of the piezoresistive sensing unit includes the following steps:

[0052] S1. Take the mean square error of the piezoresistive data of each piezoresistive sensor 500 and calculate the average value thereof as the standard average value.

[0053] S2. Select a plurality of consecutive piezoresistive sensors 500 whose mean square deviation average value is greater than the standard average value as samples.

[0054] S3. Select the piezoresistive sensor 500 with the middle number in the sample as the center point of contact between the head and the pillow.

[0055] S4. Taking the piezoresistive data of the center point piezoresistive sensor 500 as the detection value of the piezoresistive sensing unit.

[0056] Specifically, in this embodiment, the piezoresistive sensor 500 is usually divided into more than 8 zones, including Block 1, Block 2, Block 3, ..., Block n. When the smart pillow is turned on, the impedance changes of each zone caused by the weight of the pillow body 100 or the external environment are reset to zero to eliminate noise. After zeroing, R Block1 =R Block2 =…R Blockn After the smart pillow returns to zero and operates normally, the central control unit 400 starts to collect signals from each piezoresistive sensor 500. Specifically, the impedance change value ΔR of each partition at different time points is collected. Block(x) , the impedance change value corresponding to different time points is ΔR Block(x)(t) , t is in milliseconds (ms), and ΔR is the data after the detection value of the piezoresistive sensor 500 is converted by ADC. Subsequently, the mean value of a single partition is used as a reference value, where Mean is the arithmetic mean, which is calculated as follows:

[0057]

[0058] Next, calculate the mean squared deviation (S1…Sn) of the piezoresistive data from each partition. Based on the actual size of the piezoresistive sensor 500 partitions, select x for each partition as the head displacement determination zone. This x value is typically set between 3 and 5. Specifically, select 3-5 consecutive piezoresistive sensors 500 with a mean squared deviation greater than the standard mean as the key area of ​​head contact with the pillow. The middle of these 3-5 Sx values ​​is then used as the center point (Scenter) of head-pillow contact. The following example calculation assumes x is 5, and the partitions are arranged as follows:

[0059] Block(x), Block(x+1), Block(x+2), Block(x-2), Block(x-1), Block(x), Block(x+1), Block(x+2), Block(x-2), Block(x-1).

[0060] Among them, Block (x-2), Block (x-1), Block (x), Block (x+1), Block (x+2) constitute a key area. Calculate the standard average value (S DANN )as follows:

[0061]

[0062] Then, each partition is scanned multiple times in the order of Block1, Block2, Block3...Blockn to calculate the maximum value Max at the head. 头部 as follows:

[0063] Max 头部 =Max(S DANN第1次 , S DANN第2次 ……S DANN第N次 )

[0064] S DANN第1次 , S DANN第2次 ……S DANN第N次 They are the standard average values ​​obtained from the 1st to the Nth scans, and Max is the maximum value.

[0065] Finally, calculate the partition number Block of the center point piezoresistive sensor 500 center as follows:

[0066] Block center =Ceil(Number(Max 头部 )+0.5x), where Number is the number to be taken, Ceil (CeilingFunction, Chinese name for ceiling function) is a function that maps a real number to the smallest integer greater than or equal to the number, and x is 5. Block center That is the number of Scenter, and the corresponding detection value of the piezoresistive sensor 500 is the detection value ΔR of the middle area. Blockcenter , which is also the detection value of the airbag array unit 200. If the Scenter number changes rapidly within a unit time, it is considered that the system has not entered deep sleep. When the change frequency is lower than a specific threshold (third threshold), it is considered that the system has entered deep sleep.

[0067] In one embodiment, the first threshold is R1-R2. When the detection value of the airbag array unit 200 is less than R1, it is judged that the user's head is not in contact with the pillow; when the detection value of the airbag array unit 200 is greater than R2, it is judged that the user's head is in contact with the pillow and is in a non-sleep state; when the detection value of the airbag array unit 200 is between R1-R2, it is judged that the user's head is in contact with the pillow and is in a sleep state. When the detection value of the airbag array unit 200 is between R1-R2, it is judged whether the frequency of change of the center point piezoresistive sensor 500 number exceeds the third threshold. If it does not exceed the third threshold, it is judged that the user is in a deep sleep state; if it exceeds the third threshold, it is judged that the user is in a light sleep state. Preferably, R1 is 200g, R2 is 2000g, and the third threshold is that the number of changes in the Scenter number within 3 minutes is less than 2. In this way, when the detection value ΔR Blockcenter When the pressure is less than 200g, it is determined that the user's head is not acting on the pillow. At this time, the central control unit 400 resets the piezoresistive sensors 500 in each area to zero. Blockcenter When the weight is greater than 2000g, the user is judged to be in a non-sleep state and no response is made. In this embodiment, 3xMaxΔR is agreed Blockcenter In this embodiment, the determination of whether the user is in deep sleep or light sleep is for adjusting the frequency of the corresponding audio content in combination with the user's sleepiness during audio playback to improve the user's sleep quality.

[0068] In one embodiment, the central control unit 400 controls the smart pillow to enter a first control mode, a second control mode, a third control mode, and a fourth control mode based on the detection value of the piezoresistive sensing unit and the user's snoring status signal detected by the microphone 600. In the first control mode, if the central control unit 400 determines that the user has not fallen asleep and is not snoring within a preset time, the central control unit 400 controls the audio module 310 and the negative ion generator 700 to operate to help the user fall asleep. In the second control mode, if the central control unit 400 determines that the user has not fallen asleep and is not snoring after the preset time, the central control unit 400 controls the audio module 310 and the negative ion generator 700 to operate, and simultaneously controls the airbag control module 220 to massage the user's neck. During the neck massage, gas can be simultaneously inflated or exhausted into multiple evenly spaced airbags, causing the air pressure within the airbags to vary evenly, thereby massaging the user's neck and further helping the user fall asleep. In this embodiment, the preset time period for distinguishing between the first and second control modes is 20-30 minutes. In the third control mode, the central control unit 400 determines that the user is asleep and snoring. It then controls the airbags to rock according to the user's snoring intensity to stop snoring. This rocking action can be achieved by alternating the airbags on either side of the user's neck, inflating and deflating them. This creates an uneven force on both sides of the user's neck, thereby rocking the neck and waking the user, thereby stopping snoring. Depending on the severity of the user's snoring, the airbags can be inflated and deflated at different frequencies. For example, the interval between inflation and deflation can be extended for lighter snoring and shortened for heavier snoring. In the fourth control mode, the central control unit 400 determines that the user is asleep and not snoring. It then controls the audio module 310 and the negative ion generator 700 to play brainwave music that promotes deep sleep, such as low-pitched pink noise, to promote deep sleep.

[0069] It should be noted that in this embodiment, the audio playback unit 300 includes two speakers 320 electrically connected to the audio module 310. The audio module 310 controls one speaker 320 to play audio at a first frequency, and the audio module 310 controls the other speaker 320 to play audio at a second frequency, and the difference between the first frequency and the second frequency is greater than 0. The pulsed negative ion unit includes two negative ion generators 700, one negative ion generator 700 operates at a first frequency to release negative ions, and the other negative ion generator 700 operates at a second frequency to release negative ions. In this embodiment, by providing two speakers 320 with different operating frequencies, double-beat technology is used to interfere with the user's brain waves to promote sleep. Specifically, binaural beat technology is a technology that uses sound frequency to influence brain activity. When sound waves with slightly different frequencies are played to the left and right ears through headphones or speakers 320, for example, a 200Hz sound is played to the left ear and a 205Hz sound is played to the right ear, the brain will integrate the two sounds and perceive a new frequency, that is, the frequency difference between the two is 5Hz. This is called "binaural beat". The brain will produce brain waves with the same frequency as the perceived binaural beat. This phenomenon is called "frequency following response". Different brainwave states correspond to different states of consciousness, and binaural beat technology can induce the brain to enter different brainwave states through specific frequencies. For example, a binaural beat frequency of 8-14Hz can induce the brain to enter alpha mode, making people relaxed but still conscious; a binaural beat frequency of 4-7Hz can help the brain enter theta mode, making people enter a subconscious state that is neither asleep nor awake, and is often used in fields such as sleep assistance and meditation. A binaural beat frequency of 0.5-3Hz is related to the brain's delta mode and can induce the human body to enter a deep sleep state. In actual applications, different binaural beat frequencies are selected for different purposes. For example, when used for relaxation and decompression, a frequency of around 10Hz is often used. Some binaural beat audio specifically for decompression allows the left and right ears to receive audio with a frequency difference of 10Hz, which in turn causes the brain to sense and shift brainwaves to a 10Hz relaxation mode. In the field of meditation, a 4Hz binaural beat can induce a deep meditative state. In terms of learning and improving cognitive abilities, a higher frequency binaural beat such as 40Hz (corresponding to gamma waves) can enhance cognitive integration and improve the efficiency of the brain's information processing. In this embodiment, in the first control mode, the second control mode, and the light sleep state, the operating frequency difference between the two speakers 320 controlled by the audio module 310 is 6Hz to help the user fall asleep or enter deep sleep; in the fourth control mode and the deep sleep state, the operating frequency difference between the two speakers 320 controlled by the audio module 310 is 2Hz to prolong deep sleep time. Furthermore, two negative ion generators 700 are arranged on the outside of the paper cones of the two speakers 320 in a one-to-one correspondence.By setting the negative ion generator 700 outside the paper cone of the speaker 320, the vibration of the paper cone of the speaker 320 pushes the air to vibrate to generate sound waves. The vibration of the air will accelerate the diffusion of negative ions to quickly improve the user's sleeping environment.

[0070] In one embodiment, at least one piezoresistive sensor 500 is positioned below each airbag 210, and the number of airbags 210 in the airbag array unit 200 is greater than four. Preferably, in this embodiment, the airbag array unit 200 includes four airbags 210, with four piezoresistive sensors 500 positioned below each airbag 210. Through these 16 piezoresistive sensors 500, pressure changes along the length of the pillow body 100 can be comprehensively monitored. When the mean square error of the piezoresistive data from a piezoresistive sensor 500 is less than the standard mean, and the difference between the two is greater than a fourth threshold, the central control unit 400 controls the solenoid valve corresponding to the airbag 210 above the piezoresistive sensor 500 to open and control the brushless air pump to inflate. It can be understood that when the mean square error of the piezoresistive data of a piezoresistive sensor 500 is less than the standard average value, and the difference between the two is greater than the fourth threshold value, the local support force of the pillow body 100 for the user is insufficient, and the local area of ​​the user's neck may be in a suspended state. At this time, by inflating the airbag 210 corresponding to the area, the support force of the insufficiently supported area can be automatically increased, so that the support of the smart pillow for the user's neck is ergonomic.

[0071] In addition, the smart pillow also includes a power supply (i.e. Figure 5 Battery in), memory card (i.e. Figure 5 SD card in), switch (i.e. Figure 5 Switches in), lighting (i.e. Figure 5 LEDs in) and Bluetooth module (i.e. Figure 5 BT module in), wherein the power supply is used to provide the working voltage for the entire smart pillow, and the memory card is used as a storage device, which stores unique brain wave music to achieve fast playback of local music. It plays music of different frequencies through an external amplifier (AMP) using two speakers 320 on the left and right channels that have been specially debugged in terms of low frequency, and can play low-frequency brain wave music that promotes sleep. The Bluetooth module can realize the connection between the central control unit 400 of the smart pillow and the external smart mobile terminal, so that the smart pillow can be connected to the APP or applet, etc., to timely update the music source in the SD card, and also to upgrade the snoring recognition AI algorithm in the DSP. The switch is used to start and stop the smart pillow, and the light is used to turn on when the user needs lighting to meet the user's lighting needs before falling asleep.

[0072] During the operation of the smart pillow, the piezoresistive sensor 500 continuously detects the pressure exerted on the pillow body 100, while the sound collection unit (Mic array) collects ambient sound. When the detection value of the piezoresistive sensing unit meets the first threshold, the detection value of the microphone 600 reaches the second threshold, and the degree of snoring is identified through DSP calculation, the central control unit 400 determines the comprehensive state of sleep and snoring, and controls the airbag control module 220, the audio module 310 and the negative ion generator 700 to operate according to the first control mode, the second control mode, the third control mode and the fourth control mode. By monitoring the audio frequency signal output by the audio module 310 to the speaker 320, the negative ion generator 700 is controlled to operate according to the audio frequency signal, so as to achieve the purpose of improving the user's sleep quality.

[0073] The smart pillow for improving sleep quality according to the present invention collects the user's snoring by setting two microphones 600, which can effectively monitor snoring sounds at a long distance and improve the reliability and sensitivity of snoring sound collection; by setting a first threshold and a second threshold to judge the user's sleeping condition and snoring condition, the influence of the sleeping environment on the judgment of the user's sleeping condition and snoring condition can be eliminated, and the possibility of misjudgment is reduced. On the one hand, the accuracy and reliability of the judgment of the user's sleeping condition and snoring condition are improved; on the other hand, it replaces the piezoelectric sensor with algorithm judgment, which is conducive to reducing the cost of the smart pillow; while intervening in the user's snoring through adjustment of the airbag 210, it also soothes the user's nerves from the aspects of hearing and smell through audio playback and negative ion release, adopts multi-faceted adjustment to improve the user's sleep and improve the user's sleep quality.

[0074] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A smart pillow for improving sleep quality, characterized in that: It includes a pillow body and an airbag array unit, a piezoresistive sensing unit, a sound collection unit, an audio playback unit, a pulse negative ion unit and a central control unit contained in the pillow body; The airbag array unit includes a plurality of airbags arranged side by side and spaced apart along the length direction of the pillow body, and an airbag control module for controlling the inflation and deflation of each airbag; The piezoresistive sensing unit includes a plurality of piezoresistive sensors arranged side by side and spaced apart along the length direction of the pillow body and located below the airbag; The sound collection unit includes two microphones arranged at intervals; The audio playback unit includes an audio module and a speaker electrically connected to the audio module; The pulse negative ion unit includes a negative ion generator; The central control unit is electrically connected to the airbag control module, the piezoresistive sensor, the microphone, the audio module and the negative ion generator; The central control unit controls the airbag control module to operate when the detection value of the piezoresistive sensing unit meets the first threshold and the detection value of the microphone reaches the second threshold, so as to inflate and deflate the airbag and shake the user's head to stop snoring; the central control unit controls the audio module to operate to play audio when the detection value of the microphone is lower than the second threshold, and the central control unit controls the negative ion generator to operate at the same frequency as the audio played by the speaker to release negative ions.

2. The smart pillow for improving sleep quality according to claim 1, characterized in that: The selection of the detection value of the piezoresistive sensing unit includes the following steps: Take the mean square error of the piezoresistive data of each piezoresistive sensor and calculate its average value as the standard average value; Selecting a plurality of consecutive piezoresistive sensors whose mean square deviation average value is greater than a standard average value as samples; The piezoresistive sensor with the middle number in the sample is selected as the center point of contact between the head and the pillow; The piezoresistive data of the center point piezoresistive sensor is taken as the detection value of the piezoresistive sensing unit.

3. The smart pillow for improving sleep quality according to claim 2, characterized in that: The first threshold is R1-R2. When the detection value of the airbag array unit is less than R1, it is determined that the user's head is not in contact with the pillow; when the detection value of the airbag array unit is greater than R2, it is determined that the user's head is in contact with the pillow and is not in a sleeping state; when the detection value of the airbag array unit is between R1 and R2, it is determined that the user's head is in contact with the pillow and is in a sleeping state. When the detection value of the airbag array unit is between R1-R2, it is determined whether the change frequency of the center point piezoresistive sensor number exceeds the third threshold. If it does not exceed the third threshold, it is determined that the user is in a deep sleep state; if it exceeds the third threshold, it is determined that the user is in a light sleep state.

4. The smart pillow for improving sleep quality according to claim 3, characterized in that: When the detection value of the microphone is lower than the second threshold, it is determined that the user is not snoring; when the detection value of the microphone is greater than or equal to the second threshold, the degree of snoring is determined by the AI ​​model.

5. The smart pillow for improving sleep quality according to claim 4, characterized in that: The central control unit controls the smart pillow to enter a first control mode, a second control mode, a third control mode, and a fourth control mode according to the detection value of the piezoresistive sensing unit and the snoring status signal of the user detected by the microphone; In the first control mode, the central control unit determines that the user is not asleep and not snoring within a preset time, and the central control unit controls the audio module and the negative ion generator to operate; In the second control mode, the central control unit determines that the user has not fallen asleep and is not snoring after a preset time, and the central control unit controls the audio module and the negative ion generator to operate, and at the same time controls the airbag control module to operate to massage the user's neck; In the third control mode, the central control unit determines that the user is asleep and snoring, and controls the airbag to shake according to the degree of snoring to stop snoring; In the fourth control mode, the central control unit determines that the user is asleep and not snoring, and the central control unit controls the audio module and the negative ion generator to operate.

6. The smart pillow for improving sleep quality according to claim 5, characterized in that: The audio playback unit includes two speakers electrically connected to the audio module, the audio module controls one speaker to play audio at a first frequency, and the audio module controls the other speaker to play audio at a second frequency, and the difference between the first frequency and the second frequency is greater than 0; the pulse negative ion unit includes two negative ion generators, one negative ion generator operates at a first frequency to release negative ions, and the other negative ion generator operates at a second frequency to release negative ions.

7. The smart pillow for improving sleep quality according to claim 6, characterized in that: In the first control mode, the second control mode and the light sleep state, the operating frequency difference between the two speakers controlled by the audio module is 6Hz; in the fourth control mode and the deep sleep state, the operating frequency difference between the two speakers controlled by the audio module is 2Hz.

8. The smart pillow for improving sleep quality according to claim 6, characterized in that: Two negative ion generators are arranged on the outside of the paper cones of the two speakers in a one-to-one correspondence.

9. The smart pillow for improving sleep quality according to claim 5, characterized in that: The airbag control module is a brushless air pump that is electrically connected to the central control unit and inflates and deflates each airbag through forward and reverse rotation. Each airbag is equipped with a solenoid valve that is electrically connected to the central control unit. The central control unit controls the brushless air pump to operate according to a preset forward and reverse rotation frequency, and opens the solenoid valve of one or more airbags, causing the airbag to shake to interfere with the user's snoring, or to massage the user's neck.

10. The smart pillow for improving sleep quality according to claim 9, characterized in that: At least one piezoresistive sensor is provided under each airbag. When the mean square error of the piezoresistive data of a piezoresistive sensor is less than the standard average value and the difference between the two is greater than the fourth threshold, the central control unit controls the solenoid valve corresponding to the airbag above the piezoresistive sensor to open and controls the brushless air pump to inflate.

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