Active capacitance pen with voice feature authentication function and use method of active capacitance pen

Abstract

The invention relates to the field of active capacitance pens, in particular to an active capacitance pen with voice feature authentication and a using method thereof.The active capacitance pen comprises a capacitance pen body, a pressure sensing module, a voice acquisition module, a voice processing module, a storage module, an authentication control module, an elastic moving mechanism and a clamping mechanism, the pressure sensing module is arranged at the rightmost end of the capacitance pen body, and the pressure sensing module is used for transmitting an electric signal to interact with a screen, supporting pressure sensing detection and receiving and processing an instruction. Through double-factor authentication of voiceprint characteristics and a pressure mode, the method is far higher than single password verification, non-inductive authentication process, voice wake-up and pressure mode synchronous acquisition of a traditional capacitance pen, a user can complete identity verification without additional operation, and the dynamic learning unit automatically adapts to user voiceprint change and scene adaptability. And the directional microphone array and the adaptive filter can still keep the voiceprint recognition accuracy under the environment noise.

Description

Technical Field

[0001] The present invention relates to the field of active capacitive pens, and in particular to an active capacitive stylus capable of voice feature authentication and a method for using the same. Background Art

[0002] An active capacitive stylus is a high-precision input device that interacts with a touch screen through built-in circuits. Compared to a passive capacitive stylus (which only simulates finger touch), it has advantages such as pressure sensitivity, tilt detection, and low latency. It is widely used in drawing, note-taking, design, and other fields.

[0003] Currently, mainstream capacitive pens mainly rely on device pairing or screen unlocking to achieve user authentication. They need to bind to external devices via Bluetooth or rely on the biometric module of the tablet computer. Identity authentication is separated from writing: users must first unlock the terminal device before using the capacitive stylus, and the operation process is cumbersome; there is high device dependence: if the authentication terminal is not carried, sensitive operations cannot be completed; security vulnerabilities: when the device is lost, the attacker can directly operate the unlocked terminal device through physical contact with the capacitive stylus, and the existing capacitive pens have weak environmental adaptability. In noisy environments, the sound pickup effect is poor. Therefore, there is a lack of convenient user identification and a lack of capacitive pens that can guarantee sound pickup effects in noisy environments. Summary of the Invention

[0004] The present invention aims to provide an active capacitive stylus with voice feature authentication and a method for using the same, mainly to solve the technical problems existing in the prior art of not being able to conveniently perform user identification and having poor sound pickup effect in noisy environments.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] An active capacitive stylus with voice feature authentication includes a capacitive stylus body, a battery installed in the middle of the capacitive stylus body, a pressure sensing module, a voice collection module, a voice processing module, a storage module, an authentication control module, an elastic moving mechanism and a clamping mechanism. The pressure sensing module is arranged at the rightmost end of the capacitive stylus body, and is used to transmit electrical signals to interact with the screen, support pressure detection and receive and process instructions. The storage module is arranged inside the capacitive stylus body, the storage module is close to the left side of the pressure sensing module, and is used to store the voice feature template and authentication threshold of the authorized user. The authentication control module is arranged inside the capacitive stylus body, the authentication control module is close to the left side of the battery, and is used to control the capacitive stylus function according to the voiceprint feature similarity and the pressure pattern matching result. When the voiceprint similarity exceeds the threshold and the pressure pattern matches, the authentication control module is activated. Active writing function, otherwise the pen tip is locked for power supply, the voice processing module is arranged inside the capacitive pen body, the voice processing module is close to the left side of the authentication control module, and is used to include a feature extraction unit and a comparison unit, the feature extraction unit is used to extract voiceprint biometric parameters from the voice signal, including MFCC coefficients, fundamental frequency and resonance peak frequency, the voice acquisition module is arranged at the leftmost end inside the capacitive pen body, and is used to collect user voice signals and filter out environmental noise, the voice processing module is electrically connected to the voice acquisition module, the elastic moving mechanism is arranged at one end of the capacitive pen body, the elastic moving mechanism is fixedly connected to one end of the voice acquisition module, the clamping mechanism is rotatably arranged at one end of the elastic moving mechanism, a guide is provided on one side of the inner wall of the capacitive pen body, the guide is arranged in an L shape, and the outer side of the clamping mechanism is slidably connected to the guide.

[0007] Working principle and beneficial effects of the present invention:

[0008] 1. Working principle: Through the pressure sensing module, it can be used to transmit electrical signals to interact with the screen, support pressure sensing detection and receive and process instructions. The storage module is used to store the voice feature template and authentication threshold of the authorized user. The authentication control module is used to control the capacitive pen function according to the voiceprint feature similarity and pressure pattern matching results. When the voiceprint similarity exceeds the threshold and the pressure pattern matches, the writing function is activated, otherwise the pen tip is locked for power supply. The voice processing module includes a feature extraction unit and a comparison unit. The feature extraction unit is used to extract voiceprint biometric parameters from the voice signal, including MFCC coefficients, fundamental frequency and resonance peak frequency. The voice acquisition module is used to collect user voice signals and filter out environmental noise. Since the elastic moving mechanism is integrated with the voice acquisition module, the user can directly use the voice signal to filter out environmental noise. The ends are fixedly connected. Since the clamping mechanism is rotatably arranged at one end of the elastic moving mechanism, when the clamping mechanism rotates counterclockwise, the clamping mechanism can slide out from the L-shaped guide piece, and cooperate with the elastic moving mechanism to facilitate driving one end of the voice collection module to extend out of one end of the capacitive pen body, thereby increasing the sound pickup effect in a noisy environment. When the clamping mechanism is aligned with the guide piece, the clamping mechanism is pushed toward the right end of the capacitive pen body, so that the clamping mechanism moves to the inside of the L-shaped guide piece, and then the clamping mechanism is rotated clockwise so that the clamping mechanism is clamped inside the L-shaped guide piece. Cooperating with the elasticity of the elastic moving mechanism, the clamping mechanism can be made to be in close contact with the guide piece, thereby storing one end of the voice collection module, thereby ensuring the sound pickup effect of one end of the voice collection module in a quiet environment.

[0009] 2. Beneficial effects: (1) Through the dual-factor authentication of voiceprint features and pressure patterns, it is much higher than the single password verification of traditional capacitive pens, the authentication process is seamless, voice wake-up and pressure pattern are collected simultaneously, and users can complete identity verification without additional operations. The dynamic learning unit automatically adapts to the changes in user voiceprints, scene adaptability, directional microphone array and adaptive filter, and still maintains the accuracy of voiceprint recognition in environmental noise.

[0010] (2) When the clamping block rotates counterclockwise from the inside of the limiting groove to the inside of the guide groove, the restriction of the embedded ring is released. Under the action of the support spring, the movable ring drives the directional microphone array to extend out of one end of the capacitive pen body, thereby increasing the sound pickup effect in a noisy environment, and cooperates with the first dustproof net and the second dustproof net to prevent dust from entering the inside of the capacitive pen body. When the clamping block moves from the guide groove to the overlap with the limiting groove, the embedded ring is rotated clockwise to move the clamping block to the inside of the limiting groove. At this time, the support spring is compressed. Due to the support of the support spring, it is convenient to limit the position of the embedded ring, thereby storing the directional microphone array and cooperating with the first dustproof net to ensure the sound pickup effect of the directional microphone array in a quiet environment.

[0011] The pressure sensing module includes a conductive pen tip, a control chip and a pressure sensor. The conductive pen tip is installed at the rightmost end of the capacitive pen body. A pressure sensor is installed inside the capacitive pen body near the left side of the conductive pen tip. A control chip is installed inside the capacitive pen body near the left side of the pressure sensor. A Bluetooth device is installed on the control chip. The conductive pen tip and the pressure sensor are used together to transmit electrical signals to interact with the screen, support pressure detection, and receive and process instructions through the control chip, so that the capacitive pen body supports Bluetooth or NFC protocol through the action of the Bluetooth device, and is used to interact and authenticate the encrypted voiceprint feature data with external devices or cloud servers.

[0012] The storage module includes a cache, a non-volatile memory, an embedded security element and a supercapacitor. The cache is installed inside the capacitive pen body, and the cache is close to the left side of the pressure sensing module. The non-volatile memory is installed on the right side of the cache, and the embedded security element is installed on one side of the non-volatile memory. The supercapacitor is installed on the right side of the battery. The non-volatile memory permanently stores key data such as voiceprint templates and authentication thresholds. Under the action of the supercapacitor, it can prevent data damage caused by accidental power outages, and cooperate with the embedded security element to store encryption keys and sensitive biometric templates.

[0013] The authentication control module includes a dual-core MCU architecture, an SPI interface, an I2C interface, a GPIO pin and a PWM control. The dual-core MCU architecture is installed inside the capacitive pen body, and the dual-core MCU architecture is located on the left side of the battery. The dual-core MCU architecture is equipped with an SPI interface, an I2C interface, a GPIO pin and a PWM control, and the SPI interface, the I2C interface, the GPIO pin and the PWM control are arranged in a rectangular array on the dual-core MCU architecture, wherein the SPI interface and the I2C interface are located near the leftmost end of the capacitive pen body, and the GPIO pin and the PWM control are located near the rightmost end of the capacitive pen body; under the dual-core MCU architecture, the SPI interface receives the voiceprint feature vector of the voice processing module, and the I2C interface obtains the original waveform data of the pressure sensor. If the voiceprint similarity exceeds the threshold and the pressure pattern matches, the GPIO pin activates the power supply and writing function of the conductive pen tip. If any condition is not met, the operation is locked and an error code is fed back. After the authentication is passed, the pen tip parameters are dynamically adjusted or the function mode is switched through PWM control.

[0014] The voice processing module includes an embedded DSP chip, a coprocessor and an ADC unit. The embedded DSP chip is installed inside the capacitive pen, and the embedded DSP chip is close to the left side of the authentication control module. The coprocessor is installed on the embedded DSP chip, and the ADC unit is installed on the embedded DSP chip near the outside of the coprocessor. The voice instructions are processed by the ADC unit, the analog signal is digitized and the processing results are returned. The embedded DSP chip is dedicated to real-time voice signal processing, supports floating-point operations to accelerate MFCC feature extraction, and cooperates with the coprocessor to be responsible for logic control and interaction with the cache. In addition, the cache can temporarily store voice frame data and support real-time streaming processing.

[0015] The voice acquisition module includes a differential microphone circuit, a directional microphone array, an adaptive filter and a piezoelectric sensor. The differential microphone circuit is arranged on the leftmost side of the capacitive pen body. The directional microphone array is arranged inside the capacitive pen body. The adaptive filter is installed on the differential microphone circuit. The piezoelectric sensor is installed on the outside of the adaptive filter on the differential microphone circuit. When the user maintains a holding posture, the directional microphone array is awakened by the piezoelectric sensor and enters the working state. The user's voice command is input through the directional microphone array. At this time, due to the effect of the differential microphone circuit, the environmental common mode noise is eliminated under hardware-level noise suppression. In conjunction with the adaptive filter, the voice and background noise are separated in real time under software-level noise reduction.

[0016] The elastic moving mechanism includes a fixed plate, a moving tube, a moving plate, a support spring, a supporting plate, a connecting ring, a first dust screen, and a rotating ring. The fixed plate is fixedly connected to the leftmost side of the inner wall of the capacitive stylus body. A moving tube slides through both sides of the fixed plate. One end of the moving tube is fixedly connected to the moving plate. The directional microphone array is mounted on one side of the moving plate. The outer wall of the moving tube is sheathed with a supporting spring. One end of the supporting spring is fixedly connected to one side of the fixed plate and the other end is fixedly connected to one side of the moving plate. The outer wall of the moving plate is adapted to the inner wall of the capacitive stylus body. Two supporting plates are fixedly connected to one side of the moving plate. The two supporting plates are symmetrically arranged in a circular array. One end of the two supporting plates is fixedly connected to the same connecting ring. Two first dust screens are fixedly connected between the connecting ring and the moving plate. The two first dust screens are fixedly connected to the two sides of the two supporting plates respectively. One side of the connecting ring is fixedly connected to the rotating ring. In the initial state, the clamping mechanism is located inside the guide member. At this time, the directional microphone array drives the moving plate to compress the supporting spring, thereby storing the directional microphone array inside the capacitive stylus body.

[0017] The clamping mechanism includes a fixed ring, an embedded ring, a rotating groove, a second dustproof net and a clamping block. The fixed ring is arranged on the left side of the capacitive pen body, and the embedded ring is fixedly connected to one side of the fixed ring. A rotating groove is opened on one side of the embedded ring. The inner wall of the fixed ring is fixedly connected to the second dustproof net, and the outer wall of the embedded ring is fixedly connected to two clamping blocks, and the two clamping blocks are symmetrically arranged in a circular array; the outer side of the rotating ring is located inside the rotating groove. When the directional microphone array extends out of one end of the capacitive pen body, and cooperates with the function of the first dustproof net and the second dustproof net, dust is prevented from entering the interior of the capacitive pen body after the directional microphone array is extended.

[0018] The guide member includes a guide groove and a limiting groove. There are two guide grooves. The two guide grooves are opened at one end of the capacitive pen body. The two guide grooves are symmetrically arranged in a ring array. The inner wall of the capacitive pen body is opened with a limiting groove connected to the guide groove. The two limiting grooves are symmetrically arranged in a ring array; the fixed ring is rotated counterclockwise so that the fixed ring rotates on the outside of the rotating ring through the rotating groove, so that the fixed ring drives the embedded ring to rotate counterclockwise, and the embedded ring drives the clamping block to rotate from the inside of the limiting groove to the overlap of the limiting groove and the guide groove. At this time, due to the action force of the supporting spring, the movable plate is driven to move toward the left end of the capacitive pen body, so that the movable plate drives the movable tube to move on the side of the fixed plate, and then the movable plate drives the directional microphone array to extend out of one end of the capacitive pen body, thereby increasing the sound pickup effect in a noisy environment.

[0019] A method for using an active capacitive stylus with voice feature authentication includes the following steps:

[0020] S1. Voice Pickup and Noise Reduction: When the user maintains a grip, the piezoelectric sensor wakes up the directional microphone array, which then inputs the user's voice commands. The differential microphone circuit eliminates ambient common-mode noise through hardware-level noise suppression, and the adaptive filter separates voice from background noise in real time through software-level noise reduction.

[0021] S2. Voice Command Processing: The ADC unit processes voice commands, digitizes analog signals, and transmits the processed results back. The embedded DSP chip is dedicated to real-time voice signal processing, supporting floating-point operations to accelerate MFCC feature extraction. The coprocessor is responsible for logic control and interaction with the cache. The cache can temporarily store voice frame data and support real-time streaming processing.

[0022] S3, Voice Storage: Non-volatile memory permanently stores key data such as voiceprint templates and authentication thresholds. Supercapacitors prevent data corruption caused by accidental power outages and work with embedded security elements to store encryption keys and sensitive biometric templates.

[0023] S4. Voice feature recognition: Under the dual-core MCU architecture, the SPI interface receives the voiceprint feature vector from the voice processing module, and the I2C interface obtains the original waveform data of the pressure sensor. If the voiceprint similarity exceeds the threshold and the pressure pattern matches, the GPIO pin activates the conductive pen tip power supply and writing function. If any condition is not met, the operation is locked and an error code is fed back. After authentication, the pen tip parameters are dynamically adjusted or the function mode is switched through PWM control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional structural diagram of an active capacitive stylus with voice feature authentication according to the patent of this invention;

[0025] Figure 2 This is a front view of an active capacitive stylus with voice feature authentication according to the patent of this invention;

[0026] Figure 3 This is a module diagram of an active capacitive stylus with voice feature authentication according to the patent of this invention;

[0027] Figure 4 This is a structural diagram of a directional microphone array of an active capacitive stylus with voice feature authentication in the patent of this invention;

[0028] Figure 5 This is a structural diagram of a guide component of an active capacitive stylus with voice feature authentication according to the present invention;

[0029] Figure 6 This is a diagram of the support spring structure of an active capacitive stylus with voice feature authentication in the patent of this invention;

[0030] Figure 7 This is an exploded diagram of the snap-on mechanism and elastic movement mechanism of an active capacitive stylus with voice feature authentication according to the present invention;

[0031] Figure 8 This is a structural diagram of the snap-in mechanism of an active capacitive stylus with voice feature authentication according to the present invention;

[0032] Figure 9 This is a diagram of the method of using an active capacitive pen with voice feature authentication according to the patent of this invention.

[0033] The reference numerals in the drawings of the specification include:

[0034] 1. Capacitive pen body;

[0035] 2. Pressure sensing module; 201. Conductive pen tip; 202. Control chip; 203. Pressure sensor;

[0036] 3. Battery;

[0037] 4. Voice acquisition module; 401. Differential microphone circuit; 402. Directional microphone array; 403. Adaptive filter; 404. Piezoelectric sensor;

[0038] 5. Voice processing module; 501. Embedded DSP chip; 502. Coprocessor; 503. ADC unit;

[0039] 6. Storage module; 601. Cache memory; 602. Non-volatile memory; 603. Embedded security element; 604. Supercapacitor;

[0040] 7. Authentication control module; 701. Dual-core MCU architecture; 702. SPI interface; 703. I2C interface; 704. GPIO pins; 405. PWM control

[0041] 8. Bluetooth device;

[0042] 9. Elastic moving mechanism; 901. Fixed plate; 902. Moving tube; 903. Moving plate; 904. Support spring; 905. Support plate; 906. Connecting ring; 907. First dust screen; 908. Rotating ring;

[0043] 10. Clamping mechanism; 1001. Fixed ring; 1002. Embedded ring; 1003. Rotating groove; 1004. Second dustproof net; 1005. Clamping block;

[0044] 11. Guide member; 1101. Guide groove; 1102. Limiting groove. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] like Figures 1-8 As shown, claims 1 to 9 are split and merged according to their functionalities.

[0047] Embodiment 1 is as follows: It includes a capacitive pen body 1, a battery 3 is installed in the middle of the capacitive pen body 1, and also includes a pressure sensing module 2, a voice acquisition module 4, a voice processing module 5, a storage module 6, an authentication control module 7, an elastic movement mechanism 9 and a clamping mechanism 10. The pressure sensing module 2 is arranged at the rightmost end of the capacitive pen body 1, and the pressure sensing module 2 is used to transmit electrical signals to interact with the screen, support pressure detection and receive and process instructions. The pressure sensing module 2 includes a conductive pen tip 201, a control chip 202 and a pressure sensor 203. The conductive pen tip 201 is installed at the rightmost end of the capacitive pen body 1, and the pressure sensor 203 is installed inside the capacitive pen body 1 near the left side of the conductive pen tip 201. The control chip 202 is installed inside the capacitive pen body 1 near the left side of the pressure sensor 203. 02, a Bluetooth device 8 is installed on the control chip 202, a storage module 6 is set inside the capacitive pen body 1, the storage module 6 is close to the left side of the pressure sensing module 2, and is used to store the voice feature template and authentication threshold of the authorized user, the storage module 6 includes a cache 601, a non-volatile memory 602, an embedded security element 603 and a super capacitor 604, the cache 601 is installed inside the capacitive pen body 1, and the cache 601 is close to the left side of the pressure sensing module 2, the cache 601 is installed on the right side of the non-volatile memory 602, the non-volatile memory 602 is installed on one side, the super capacitor 604 is installed on the right side of the battery 3, the authentication control module 7 is set inside the capacitive pen body 1, the authentication control module 7 is close to the left side of the battery 3 and is used to control the capacitive pen function according to the voiceprint feature similarity and pressure pattern matching results. When the voiceprint similarity exceeds the threshold and the pressure pattern matches, the writing function is activated, otherwise the pen tip power supply is locked. The authentication control module 7 includes a dual-core MCU architecture 701, an SPI interface 702, an I2C interface 703, a GPIO pin 704 and a PWM control 405. The dual-core MCU architecture 701 is installed inside the capacitive pen body 1, and the dual-core MCU architecture 701 is located on the left side of the battery 3. The dual-core MCU architecture 701 is equipped with an SPI interface 702, an I2C interface 703, a GPIO pin 704 and a PWM control 405, and the SPI interface 702, the I2C interface 703, the GPIO pin 704 and The PWM control 405 is arranged in a rectangular array on the dual-core MCU architecture 701, wherein the SPI interface 702 and the I2C interface 703 are located near the leftmost end of the capacitive pen body 1, and the GPIO pin 704 and the PWM control 405 are located near the rightmost end of the capacitive pen body 1. The voice processing module 5 is arranged inside the capacitive pen body 1, and the voice processing module 5 is close to the left side of the authentication control module 7, and is used to include a feature extraction unit and a comparison unit. The feature extraction unit is used to extract voiceprint biometric parameters from the voice signal, including MFCC coefficients, fundamental frequency and formant frequency. The voice processing module 5 includes an embedded DSP chip 501, a coprocessor 502 and an ADC unit 503. The embedded DSP chip 501 is installed inside the capacitive pen 1.The embedded DSP chip 501 is close to the left side of the authentication control module 7, a coprocessor 502 is installed on the embedded DSP chip 501, an ADC unit 503 is installed on the embedded DSP chip 501 near the outside of the coprocessor 502, the voice acquisition module 4 is set at the leftmost end inside the capacitive pen body 1, and is used to collect user voice signals and filter out environmental noise, the voice processing module 5 is electrically connected to the voice acquisition module 4, the voice acquisition module 4 includes a differential microphone circuit 401, a directional microphone array 402, an adaptive filter 403 and a piezoelectric sensor 404, the differential microphone circuit 401 is set at the leftmost end inside the capacitive pen body 1, the capacitive pen body 1 is provided with a directional microphone array 402, the differential microphone circuit An adaptive filter 403 is installed on 401, and a piezoelectric sensor 404 is installed on the differential microphone circuit 401 near the outside of the adaptive filter 403. When the user maintains a holding posture, the piezoelectric sensor 404 wakes up the directional microphone array 402 to enter the working state, and the directional microphone array 402 inputs the user's voice command. At this time, due to the effect of the differential microphone circuit 401, the environmental common mode noise is eliminated under the hardware level noise suppression, and the adaptive filter 403 is used to separate the voice and background noise in real time under the software level noise reduction. The voice command is processed by the ADC unit 503, the analog signal is digitized and the processing result is returned, and the embedded DSP chip 501 is used for real-time voice signal Processing, supports floating-point operations to accelerate MFCC feature extraction, and cooperates with the coprocessor 502 to be responsible for logic control and interaction with the cache 601. In addition, the cache 601 can temporarily store voice frame data and support real-time streaming processing. It permanently stores key data such as voiceprint templates and authentication thresholds through the non-volatile memory 602. Under the action of the supercapacitor 604, it can prevent data damage caused by accidental power failure, and cooperates with the embedded security element 603 to store encryption keys and sensitive biometric templates. Under the dual-core MCU architecture 701, the SPI interface 702 receives the voiceprint feature vector of the voice processing module 5, and the I2C interface 703 obtains the original waveform data of the pressure sensor 203. If the voiceprint similarity exceeds the threshold and the pressure mode Matching, GPIO pin 704 activates the power supply and writing function of the conductive pen tip 201. If any condition is not met, the operation is locked and an error code is fed back. After the authentication is passed, the pen tip parameters are dynamically adjusted or the function mode is switched through PWM control 405. Then, through the action of the Bluetooth device 8, the capacitive pen body 1 supports Bluetooth or NFC protocol, which is used to interact and authenticate the encrypted voiceprint feature data with an external device or cloud server. In summary, the dual-factor authentication of voiceprint features and pressure mode is much higher than the single password verification of the traditional capacitive pen body 1. The non-sensing authentication process, voice wake-up and pressure mode are collected synchronously. The user can complete the identity verification without additional operation. The dynamic learning unit automatically adapts to the changes in the user's voiceprint and scene adaptability.Directional microphone array 402 and adaptive filter 403 maintain voiceprint recognition accuracy under ambient noise;

[0048] The elastic moving mechanism 9 is arranged at one end of the capacitive pen body 1, and the elastic moving mechanism 9 is fixedly connected to one end of the voice collection module 4. The elastic moving mechanism 9 includes a fixed plate 901, a moving tube 902, a moving plate 903, a support spring 904, a support plate 905, a connecting ring 906, a first dustproof net 907 and a rotating ring 908. The fixed plate 901 is fixedly connected to the leftmost side of the inner wall of the capacitive pen body 1. The same moving tube 902 slides through both sides of the fixed plate 901. One end of the moving tube 902 is fixedly connected to the moving plate 903. The directional microphone array 402 is installed on one side of the moving plate 903. The outer wall of the moving tube 902 is provided with a supporting spring 904. One end of the supporting spring 904 is fixedly connected to one side of the fixed plate 901, and the other end is fixed to the moving plate 903. 03 one side is fixedly connected, the outer wall of the movable plate 903 is adapted to the inner wall of the capacitive pen body 1, one side of the movable plate 903 is fixedly connected to two supporting plates 905, the two supporting plates 905 are symmetrically arranged in a ring array, one end of the two supporting plates 905 is fixedly connected to the same connecting ring 906, two first dustproof nets 907 are fixedly connected between the connecting ring 906 and the movable plate 903, the two first dustproof nets 907 are fixedly connected to the two sides of the two supporting plates 905 on both sides respectively, and a rotating ring 908 is fixedly connected to one side of the connecting ring 906, and the clamping mechanism 10 is rotatably arranged at one end of the elastic movable mechanism 9, and the clamping mechanism 10 includes a fixed ring 1001, an embedded ring 1002, a rotating groove 1003, a second dustproof net 1004 and a clamping block 100 5. A fixing ring 1001 is arranged on the left side of the capacitive pen body 1. An embedded ring 1002 is fixedly connected to one side of the fixing ring 1001. A rotation groove 1003 is opened on one side of the embedded ring 1002. A second dustproof net 1004 is fixedly connected to the inner wall of the fixing ring 1001. Two clamping blocks 1005 are fixedly connected to the outer wall of the embedded ring 1002. The two clamping blocks 1005 are symmetrically arranged in a ring array. A guide member 11 is provided on one side of the inner wall of the capacitive pen body 1. The guide member 11 includes a guide groove 1101 and a limiting groove 1102. There are two guide grooves 1101. The two guide grooves 1101 are opened at one end of the capacitive pen body 1. The two guide grooves 1101 are symmetrically arranged in a ring array. The inner wall of the capacitive pen body 1 is provided with a limiting groove 1101. The two limiting grooves 1102 are symmetrically arranged in a ring array, and the guide member 11 is set to be L-shaped. The outer side of the clamping mechanism 10 is slidably connected to the guide member 11. In the initial state, the clamping block 1005 is located inside the limiting groove 1102. At this time, the directional microphone array 402 drives the movable plate 903 to compress the support spring 904, and rotates the fixed ring 1001 counterclockwise, so that the fixed ring 1001 rotates outside the rotating ring 908 through the rotating groove 1003, so that the fixed ring 1001 drives the embedded ring 1002 to rotate counterclockwise, so that the embedded ring 1002 drives the clamping block 1005 to rotate from the inside of the limiting groove 1102 to the overlap of the limiting groove 1102 and the guide groove 1101. At this time, due to the force of the support spring 904,Drive the movable plate 903 to move toward the left end of the capacitive pen body 1, so that the movable plate 903 drives the movable tube 902 to move on the side of the fixed plate 901, and then the movable plate 903 drives the directional microphone array 402 to extend out of one end of the capacitive pen body 1, thereby increasing the sound pickup effect in a noisy environment, and cooperates with the first dustproof net 907 and the second dustproof net 1004 to prevent dust from entering the interior of the capacitive pen body 1 after the directional microphone array 402 is extended, rotate the fixed ring 1001, so that the fixed ring 1001 rotates outside the rotating ring 908, and when the fixed ring 1001 and the embedded ring 1002 drive the clamping block 1005 to rotate to align with the guide groove 1101, push the fixed ring 1001 so that the fixed ring 100 1 moves toward the right end of the capacitive stylus body, so that the clamping block 1005 moves from the guide groove 1101 to the overlap of the guide groove 1101 and the limiting groove 1102. The fixing ring 1001 is rotated clockwise, so that the fixing ring 1001 drives the embedded ring 1002 to rotate, and the embedded ring 1002 drives the clamping block 1005 to move into the limiting groove 1102. At this time, the support spring 904 is compressed. Due to the support of the support spring 904, the clamping block 1005 is tightly fitted with one side of the limiting groove 1102, thereby limiting the position of the embedded ring 1002, thereby storing the directional microphone array 402. In conjunction with the first dustproof net 907, the sound pickup effect of the directional microphone array 402 in a quiet environment is ensured.

[0049] like Figure 9 As shown, it is directed to claim 10.

[0050] The second embodiment is as follows: comprising the following steps:

[0051] S1. Sound pickup and noise reduction: When the user maintains a gripping posture, the piezoelectric sensor 404 wakes up the directional microphone array 402 and puts it into operation. The directional microphone array 402 then receives the user's voice command. At this point, the differential microphone circuit 401 eliminates ambient common-mode noise through hardware-level noise suppression, and cooperates with the adaptive filter 403 to separate speech and background noise in real time through software-level noise reduction.

[0052] S2. Voice command processing: The ADC unit 503 processes the voice command, digitizes the analog signal, and transmits the processing results back. The embedded DSP chip 501 is dedicated to real-time voice signal processing, supports floating-point operations to accelerate MFCC feature extraction, and cooperates with the coprocessor 502 to be responsible for logic control and interaction with the cache 601. In addition, the cache 601 can temporarily store voice frame data and support real-time streaming processing.

[0053] S3. Voice storage: Non-volatile memory 602 permanently stores key data such as voiceprint templates and authentication thresholds. Supercapacitor 604 prevents data corruption caused by accidental power outages and works with embedded security element 603 to store encryption keys and sensitive biometric templates.

[0054] S4. Voice feature recognition: Under the dual-core MCU architecture 701, the SPI interface 702 receives the voiceprint feature vector of the voice processing module 5, and the I2C interface 703 obtains the original waveform data of the pressure sensor 203. If the voiceprint similarity exceeds the threshold and the pressure pattern matches, the GPIO pin 704 activates the power supply and writing function of the conductive pen tip 201. If any condition is not met, the operation is locked and an error code is fed back. After authentication is passed, the pen tip parameters are dynamically adjusted or the function mode is switched through the PWM control 405.

[0055] The specific implementation of the present invention is as follows: when the user maintains a holding posture, the piezoelectric sensor 404 wakes up the directional microphone array 402 to enter the working state, and the directional microphone array 402 inputs the user's voice command. At this time, due to the action of the differential microphone circuit 401, the environmental common mode noise is eliminated under the hardware-level noise suppression, and the adaptive filter 403 is used to separate the voice and background noise in real time under the software-level noise reduction. The ADC unit 503 processes the voice command, completes the analog signal digitization and returns the processing result, and uses the embedded DSP chip 501, which is dedicated to real-time voice signal processing and supports floating-point operations to accelerate MFCC feature extraction. At the same time, it cooperates with the coprocessor 502 to be responsible for logic control and interaction with the cache 601. In addition, the cache 601 can temporarily store voice frame data and support real-time streaming processing. The non-volatile memory 602 permanently stores key data such as voiceprint templates and authentication thresholds. Under the action of the supercapacitor 604, it can prevent data damage caused by accidental power failure, and cooperates with the embedded security element 603 to store encryption keys, sensitive biometrics, etc. Object feature template, under the dual-core MCU architecture 701, the SPI interface 702 receives the voiceprint feature vector of the voice processing module 5, and the I2C interface 703 obtains the original waveform data of the pressure sensor 203. If the voiceprint similarity exceeds the threshold and the pressure pattern matches, the GPIO pin 704 activates the power supply and writing function of the conductive pen tip 201. If any condition is not met, the operation is locked and an error code is fed back. After authentication, the pen tip parameters are dynamically adjusted or the function mode is switched through the PWM control 405. Then, through the action of the Bluetooth device 8, the capacitive pen body 1 supports Bluetooth or NFC protocol for interactive authentication of the encrypted voiceprint feature data with an external device or cloud server. In summary, the dual-factor authentication of voiceprint features and pressure patterns is far superior to the single password verification of the traditional capacitive pen body 1. The non-sensing authentication process, voice wake-up and pressure pattern synchronous collection, the user can complete identity verification without additional operation. The dynamic learning unit automatically adapts to the changes in the user's voiceprint. The scene adaptability, directional microphone array 402 and adaptive filter 403, still maintain the voiceprint recognition accuracy in the presence of environmental noise;

[0056] In addition, in the initial state, the clamping block 1005 is located inside the limiting groove 1102. At this time, the directional microphone array 402 drives the movable plate 903 to compress the support spring 904, and rotates the fixed ring 1001 counterclockwise, so that the fixed ring 1001 rotates outside the rotating ring 908 through the rotating groove 1003, so that the fixed ring 1001 drives the embedded ring 1002 to rotate counterclockwise, so that the embedded ring 1002 drives the clamping block 1005 to rotate from the inside of the limiting groove 1102 to the limiting groove 1102 and the guide groove 1102. At the overlap of the slot 1101, due to the force of the support spring 904, the movable plate 903 is driven to move toward the left end of the capacitive pen body 1, so that the movable plate 903 drives the movable tube 902 to move on the side of the fixed plate 901, and then the movable plate 903 drives the directional microphone array 402 to extend out of one end of the capacitive pen body 1, thereby increasing the sound pickup effect in a noisy environment, and cooperating with the first dustproof net 907 and the second dustproof net 1004 to prevent dust from entering the capacitor after the directional microphone array 402 is extended. Inside the pen body 1, rotate the fixed ring 1001 so that the fixed ring 1001 rotates outside the rotating ring 908. When the fixed ring 1001 and the embedded ring 1002 drive the clamping block 1005 to rotate to align with the guide groove 1101, push the fixed ring 1001 so that the fixed ring 1001 moves to the right end of the capacitive pen body 1, so that the clamping block 1005 moves from the guide groove 1101 to the overlap of the guide groove 1101 and the limiting groove 1102. Rotate the fixed ring 1001 clockwise so that the fixed ring 1001 drives the embedded ring 1002 to rotate, so that the embedded ring 1002 drives the clamping block 1005 to move to the inside of the limiting groove 1102. At this time, the support spring 904 is compressed. Due to the support of the support spring 904, the clamping block 1005 fits tightly with one side of the limiting groove 1102, thereby limiting the position of the embedded ring 1002, thereby storing the directional microphone array 402, and cooperating with the first dustproof net 907 to ensure the sound pickup effect of the directional microphone array 402 in a quiet environment.

[0057] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An active capacitive stylus with voice feature authentication, characterized by: The invention comprises a capacitive pen body (1), a battery (3) is installed in the middle of the capacitive pen body (1), and further comprises a pressure sensing module (2), a voice collection module (4), a voice processing module (5), a storage module (6), an authentication control module (7), an elastic moving mechanism (9) and a clamping mechanism (10). The pressure sensing module (2) is arranged at the rightmost end of the capacitive pen body (1), and is used to transmit electric signals to interact with the screen, support pressure sensing detection and receive and process instructions. The storage module (6) is arranged inside the capacitive pen body (1), the storage module (6) is close to the left side of the pressure sensing module (2), and is used to store the voice feature template and authentication threshold of the authorized user. The authentication control module (7) is arranged inside the capacitive pen body (1), the authentication control module (7) is close to the left side of the battery (3), and is used to control the capacitive pen function according to the voiceprint feature similarity and the pressure pattern matching result. When the voiceprint similarity exceeds the threshold and the pressure pattern matches, the writing function is activated, otherwise the writing function is activated. The pen tip is locked for power supply. A voice processing module (5) is arranged inside the capacitive pen body (1). The voice processing module (5) is close to the left side of the authentication control module (7) and is used to include a feature extraction unit and a comparison unit. The feature extraction unit is used to extract voiceprint biometric parameters from the voice signal, including MFCC coefficients, fundamental frequency and formant frequency. The voice collection module (4) is arranged at the leftmost end inside the capacitive pen body (1) and is used to collect user voice signals and filter out environmental noise. The voice processing module (5) is electrically connected to the voice collection module (4). An elastic moving mechanism (9) is arranged at one end of the capacitive pen body (1). The elastic moving mechanism (9) is fixedly connected to one end of the voice collection module (4). A clamping mechanism (10) is rotatably arranged at one end of the elastic moving mechanism (9). A guide member (11) is arranged on one side of the inner wall of the capacitive pen body (1). The guide member (11) is arranged in an L shape. The outer side of the clamping mechanism (10) is slidably connected to the guide member (11).

2. The active capacitive stylus pen with voice feature authentication according to claim 1, characterized in that: The pressure sensing module (2) comprises a conductive pen tip (201), a control chip (202) and a pressure sensor (203); the conductive pen tip (201) is mounted at the rightmost end of the capacitive pen body (1); the pressure sensor (203) is mounted on the left side of the conductive pen tip (201) inside the capacitive pen body (1); the control chip (202) is mounted on the left side of the pressure sensor (203) inside the capacitive pen body (1); and a Bluetooth device (8) is mounted on the control chip (202).

3. The active capacitive stylus pen capable of voice feature authentication according to claim 1, characterized in that: The storage module (6) comprises a cache memory (601), a non-volatile memory (602), an embedded security element (603) and a super capacitor (604); the cache memory (601) is installed inside the capacitive stylus body (1), and the cache memory (601) is close to the left side of the pressure sensing module (2); the non-volatile memory (602) is installed on the right side of the cache memory (601); the embedded security element (603) is installed on one side of the non-volatile memory (602); and the super capacitor (604) is installed on the right side of the battery (3).

4. The active capacitive stylus pen with voice feature authentication according to claim 1, characterized in that: The authentication control module (7) comprises a dual-core MCU architecture (701), an SPI interface (702), an I2C interface (703), a GPIO pin (704) and a PWM control (405); the dual-core MCU architecture (701) is installed inside the capacitive pen body (1), and the dual-core MCU architecture (701) is located on the left side of the battery (3); the dual-core MCU architecture (701) is equipped with an SPI interface (702), an I2C interface (703), a GPIO pin (704) and a PWM control (405); and the SPI interface (702), the I2C interface (703), the GPIO pin (704) and the PWM control (405) are arranged in a rectangular array on the dual-core MCU architecture (701), wherein the SPI interface (702) and the I2C interface (703) are located near the leftmost end of the capacitive pen body (1), and the GPIO pin (704) and the PWM control (405) are located near the rightmost end of the capacitive pen body (1).

5. The active capacitive stylus pen capable of voice feature authentication according to claim 1, characterized in that: The speech processing module (5) comprises an embedded DSP chip (501), a coprocessor (502) and an ADC unit (503); the embedded DSP chip (501) is installed inside the capacitive stylus (1), and the embedded DSP chip (501) is close to the left side of the authentication control module (7); the coprocessor (502) is installed on the embedded DSP chip (501); and the ADC unit (503) is installed on the embedded DSP chip (501) close to the outside of the coprocessor (502).

6. The active capacitive stylus pen with voice feature authentication according to claim 1, characterized in that: The voice acquisition module (4) comprises a differential microphone circuit (401), a directional microphone array (402), an adaptive filter (403) and a piezoelectric sensor (404); the differential microphone circuit (401) is arranged at the leftmost side of the capacitive pen body (1); the directional microphone array (402) is arranged inside the capacitive pen body (1); the adaptive filter (403) is installed on the differential microphone circuit (401); and the piezoelectric sensor (404) is installed on the differential microphone circuit (401) near the outside of the adaptive filter (403).

7. The active capacitive stylus pen capable of voice feature authentication according to claim 6, characterized in that: The elastic moving mechanism (9) comprises a fixed plate (901), a moving tube (902), a moving plate (903), a supporting spring (904), a supporting plate (905), a connecting ring (906), a first dustproof net (907) and a rotating ring (908); the fixed plate (901) is fixedly connected to the leftmost side of the inner wall of the capacitive pen body (1); a same moving tube (902) is slidably passed through both sides of the fixed plate (901); one end of the moving tube (902) is fixedly connected to the moving plate (903); the directional microphone array (402) is installed on one side of the moving plate (903); the outer wall of the moving tube (902) is provided with a supporting spring (904); one end of the supporting spring (904) is connected to the inner wall of the capacitive pen body (1); One side of the fixed plate (901) is fixedly connected, and the other end is fixedly connected to one side of the movable plate (903). The outer wall of the movable plate (903) is adapted to the inner wall of the capacitive stylus body (1). One side of the movable plate (903) is fixedly connected to two supporting plates (905). The two supporting plates (905) are symmetrically arranged in a ring array. One end of the two supporting plates (905) is fixedly connected to the same connecting ring (906). Two first dustproof nets (907) are fixedly connected between the connecting ring (906) and the movable plate (903). The two sides of the two first dustproof nets (907) are fixedly connected to the two sides of the two supporting plates (905) respectively. One side of the connecting ring (906) is fixedly connected to a rotating ring (908).

8. The active capacitive stylus pen capable of voice feature authentication according to claim 1, characterized in that: The clamping mechanism (10) comprises a fixed ring (1001), an embedded ring (1002), a rotation groove (1003), a second dustproof net (1004) and a clamping block (1005); the fixed ring (1001) is arranged on the left side of the capacitive stylus body (1); one side of the fixed ring (1001) is fixedly connected to the embedded ring (1002); one side of the embedded ring (1002) is provided with a rotation groove (1003); the inner wall of the fixed ring (1001) is fixedly connected to the second dustproof net (1004); the outer wall of the embedded ring (1002) is fixedly connected to two clamping blocks (1005); the two clamping blocks (1005) are symmetrically arranged in a ring array.

9. The active capacitive stylus pen with voice feature authentication according to claim 1, characterized in that: The guide member (11) comprises a guide groove (1101) and a limiting groove (1102), wherein two guide grooves (1101) are provided, and the two guide grooves (1101) are opened at one end of the capacitive pen body (1), and the two guide grooves (1101) are symmetrically arranged in a ring array. The inner wall of the capacitive pen body (1) is provided with a limiting groove (1102) connected to the guide groove (1101), and the two limiting grooves (1102) are symmetrically arranged in a ring array.

10. A method for using an active capacitive stylus with voice feature authentication, characterized in that: The steps include: S1. Sound pickup and noise reduction: When the user maintains a gripping posture, the directional microphone array (402) is awakened by the piezoelectric sensor (404) and enters a working state. The user's voice command is input through the directional microphone array (402). At this time, due to the effect of the differential microphone circuit (401), the environmental common mode noise is eliminated under hardware-level noise suppression. In conjunction with the adaptive filter (403), the voice and background noise are separated in real time under software-level noise reduction. S2, voice command processing: The voice command is processed by the ADC unit (503), the analog signal is digitized and the processing result is transmitted back, and the embedded DSP chip (501) is dedicated to real-time voice signal processing, supports floating-point operations to accelerate MFCC feature extraction, and cooperates with the coprocessor (502) to be responsible for logic control and interaction with the cache (601). In addition, the cache (601) can temporarily store voice frame data and support real-time streaming processing; S3. Voice storage: The non-volatile memory (602) permanently stores key data such as voiceprint templates and authentication thresholds. With the help of the supercapacitor (604), data corruption caused by accidental power outages can be prevented. The embedded security element (603) can also be used to store encryption keys and sensitive biometric templates. S4. Voice feature recognition: Under the dual-core MCU architecture (701), the SPI interface (702) receives the voiceprint feature vector of the voice processing module (5), and the I2C interface (703) obtains the original waveform data of the pressure sensor (203). If the voiceprint similarity exceeds the threshold and the pressure pattern matches, the GPIO pin (704) activates the power supply and writing function of the conductive pen tip (201). If any condition is not met, the operation is locked and an error code is fed back. After authentication is passed, the pen tip parameters are dynamically adjusted or the function mode is switched through the PWM control (405).

Images