An encrypted digital intercom and its use method

Abstract

The present invention discloses an encrypted digital intercom and a method for using the same, and relates to intercom-related fields, including an intercom housing, an operating screen, a button, a dust screen, a conversion device, a chip module, an antenna, an indicator light, an adjustment button, a back clip, and an interface. The present invention provides a conversion device at the upper left end of the intercom housing, and the conversion device is equipped with a bevel gear set, which can be driven by rotating a knob in the device. During the transmission process, a switching disk at the bottom of the device rotates, and can be connected to three groups of contact disks corresponding to three groups of chips in rotation for switching. The operation is convenient, the switching speed is fast, and it is convenient for the group to quickly adjust the encryption mode. The conversion device is connected to the antenna, and the antenna can be quickly disassembled by rotating, and the antenna will not be loosened during the encryption switching process, and the overall convenience is high.

Description

Technical Field

[0001] The present invention relates to the field of intercoms, and in particular to an encrypted digital intercom and a method for using the same. Background Art

[0002] A digital walkie-talkie is a wireless communication device that transmits voice and data via digital signals. Unlike traditional analog walkie-talkies, digital walkie-talkies convert voice signals into digital signals for transmission, which can provide higher quality audio, longer communication distances, and better anti-interference capabilities. Some digital walkie-talkies also have encryption functions, which facilitates secure encrypted communications between the two parties.

[0003] The Chinese patent application number is: CN202223296181.6, which supports voice encryption and relates to the field of walkie-talkie manufacturing technology. Specifically, it is a walkie-talkie supporting voice encryption with a reasonable structure and high security. A call component is provided on the shell, and the call component includes a microphone, a speaker, and a call function circuit. The call function circuit is provided with a main controller, a microphone control circuit, a speaker control circuit, a wireless communication circuit, and an antenna, wherein the main controller is respectively connected to the microphone control circuit, the speaker control circuit, and the wireless communication circuit, the microphone is connected to the microphone control circuit, the speaker is connected to the speaker control circuit, and the wireless communication circuit is connected to the antenna. It is characterized in that a voice encryption / decryption circuit is also provided in the call function circuit, and the voice encryption / decryption circuit is connected to the main controller. Compared with the prior art, it has significant advantages such as reasonable structure, small size, and high security.

[0004] The above patents and prior art have the following problems: when using encrypted walkie-talkies, it is rather cumbersome to change the encryption algorithm. If used by a group, cumbersome steps need to be adjusted one by one, which affects the efficiency of use. In addition, the antennas are all fixedly installed, which makes some antennas less suitable for use in specific environments. Replacement requires the simultaneous replacement of the walkie-talkie body. Summary of the invention

[0005] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides an encrypted digital intercom and a method for using the same.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an encrypted digital intercom and a method of using the same, comprising an intercom housing, an operation screen is arranged at the upper end of the front end surface of the intercom housing, a button is arranged at the bottom of the operation screen, a dustproof net is embedded at the lower end of the front end surface of the intercom housing, a conversion device is installed at the upper left end of the intercom housing, the bottom of the conversion device contacts the chip module, the chip module is arranged at the upper left end of the intercom housing, the conversion device contacts the chip module to realize encryption mode switching, an antenna connected to the conversion device is installed at the left end of the top of the intercom housing, an indicator light is installed at the middle of the top of the intercom housing, an adjustment button is arranged on the right side of the indicator light, a back clip is arranged at the upper end of the back of the intercom housing, and an interface is installed at the lower end of the back of the intercom housing;

[0007] The conversion device includes a fixing seat arranged at the upper left end of the intercom housing, a knob arranged at the left side of the fixing seat, a connecting shaft arranged at the upper end of the intercom housing and connected to the knob, a supporting member arranged at the left side of the connecting shaft, an active bevel gear connected to the right side of the connecting shaft, a driven bevel gear meshing with the bottom of the active bevel gear, a connecting member arranged at the middle of the driven bevel gear, a rotating cylinder arranged at the bottom of the driven bevel gear, a switching disk installed at the bottom of the rotating cylinder and contacting the chip module at the bottom, an insert embedded in the connecting member, a limiting member arranged at the top of the insert, and a connecting rod arranged at the top of the limiting member and connected to the bottom of the antenna.

[0008] Preferably, a pointer protrudes from the left side of the knob, and the left side surface of the fixing seat is divided into four parts.

[0009] Preferably, a socket is provided in the middle of the connector, and the insert is inserted into the socket.

[0010] Preferably, a limiting groove is provided on the left side of the limiting member, and the lower end of the limiting groove extends to the bottom of the limiting member.

[0011] Preferably, a limiting rod is fixed to the lower right end of the active bevel gear, and the limiting rod is movably embedded in the limiting groove.

[0012] Preferably, the switching disk includes a disk body connected to the bottom of the rotating cylinder, a contact plate arranged in the middle of a quarter of the bottom of the disk body, a scraping pad arranged at a position opposite to the contact plate, and a transmission member arranged inside the disk body and connecting the contact plate and the connector.

[0013] Preferably, the chip module is internally divided into four parts, three of which are provided with chips, and a contact pad is installed at the top of the chip module corresponding to the chip position, and the contact pad is connected to the chip.

[0014] Preferably, the intercom housing is provided with an intercom hardware part and a software part.

[0015] The hardware part includes:

[0016] Transmitter module: Digital signal processor: responsible for the acquisition, digital processing and encryption of voice signals. After the voice is converted into digital signals by the analog-to-digital converter, it is compressed, encoded and encrypted here; encryption chip: used to encrypt voice and data signals; RF transmitter: converts the encrypted digital signal into radio waves and transmits it through the antenna;

[0017] Receiving module: RF receiver: receives radio signals and converts them into digital signals; decryption chip: decrypts the received encrypted signals and uses the correct key to restore the original voice or data; digital signal processor: the decrypted digital signal is decoded and processed, and finally restored to the voice signal through the digital-to-analog converter;

[0018] Control processor: Main control unit: responsible for managing the various functions of the walkie-talkie, channel switching, identity authentication, encryption key management, and the main control unit is also responsible for coordinating the encryption and decryption processes to ensure normal communication;

[0019] Memory: Storage of keys and configuration files: securely stores keys and communication settings used for encryption. The key storage area usually has tamper-proof features to ensure the security of the keys.

[0020] The software part includes:

[0021] Encryption algorithm: AES (Advanced Encryption Standard): It has the characteristics of high efficiency and strong security, and is used to encrypt voice and data; DES / 3DES (Data Encryption Standard / Triple Data Encryption Standard): Symmetric encryption algorithm; ECC (Elliptic Curve Cryptography): Asymmetric encryption algorithm used for key exchange or identity authentication, providing a high-security key length;

[0022] Key management: Key generation and distribution: The key is input by the user or automatically generated by the system. The intercom needs to distribute and manage the key before communication to ensure that the sending and receiving devices use the same key; Key update: Regularly update the encryption key to prevent the long-term use of the same key from reducing security;

[0023] Identity authentication: Digital signature and certificate verification: Use digital certificates or preset identity tags to verify the identities of both parties in communication, ensuring that only authorized devices can participate in communication; Challenge-response mechanism: Used to authenticate the identities of devices at the beginning of communication to prevent counterfeit devices from joining the network;

[0024] Communication protocol: Frequency hopping: Some encrypted walkie-talkies support frequency hopping technology, and the communication signal will switch quickly between multiple frequencies to enhance anti-interference capabilities and improve the concealment of communications; Time Division Multiple Access or Frequency Division Multiple Access: used to enable encrypted communications among multiple users on the same frequency band, thereby improving system capacity and flexibility.

[0025] Preferably, the specific steps are as follows:

[0026] S1 control intercom: Use the operation screen and buttons to operate the intercom. The indicator light on the top shows the current state of the intercom. Adjust the frequency by adjusting the knob on the top.

[0027] S2 back clip usage and charging: Fix the back clip on the back of the walkie-talkie on your clothes to carry it, and use the interface at the bottom to connect the power supply to charge the walkie-talkie;

[0028] S3 encrypted communication operation: The sending device converts the voice signal into a digital signal through a digital processor. The digital signal is encrypted by an encryption algorithm and then sent to the receiving device. The receiving device uses the stored key to decrypt the encrypted signal and restore the original voice or data. Before the communication begins, the device performs two-way authentication through a preset identity authentication system. The key is exchanged or pre-stored through a secure channel. After completing the authentication and key exchange, the two parties can conduct secure encrypted communication.

[0029] S4 encryption chip conversion: Turn the knob on the left side of the fixed seat, the knob drives the connecting shaft to rotate, the connecting shaft drives the active bevel gear to rotate, the active bevel gear drives the driven bevel gear to rotate, the driven bevel gear drives the bottom rotating cylinder to rotate, the contact plate inside the switching disk docks according to the knob instruction, and the encryption mode conversion is completed;

[0030] S5 antenna replacement: Turn the knob to align the limit rod with the lower opening of the limit slot, apply force to pull out the existing antenna for removal. When inserting the new antenna, align the embedded part at the bottom with the connecting part and insert it. After the limit rod enters the limit slot, turn the knob again to fix the antenna. The antenna replacement is complete.

[0031] Beneficial effects of the present invention:

[0032] The present invention provides a conversion device at the upper left end of the intercom housing, and the conversion device has a built-in bevel gear set, which can be transmitted as the knob in the device is rotated. During the transmission process, the switching disk at the bottom follows the rotation and can be rotated to be connected to three groups of contact disks corresponding to three groups of chips for switching. The operation is convenient and the switching speed is fast, which is convenient for the group to quickly adjust the encryption mode. The conversion device is connected to the antenna, and the antenna can be quickly disassembled by rotation. The antenna will not loosen during the encryption switching process, and the overall convenience is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the present invention;

[0034] Figure 2 It is a structural schematic diagram of another viewing angle of the present invention;

[0035] Figure 3It is a schematic diagram of the partial internal structure of the present invention;

[0036] Figure 4 It is a schematic diagram of the explosion structure of the conversion device of the present invention;

[0037] Figure 5 It is a schematic diagram of the structure of the limiter of the present invention;

[0038] Figure 6 It is a schematic diagram of the limit rod structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the main structure of the bevel gear connection of the present invention;

[0040] Figure 8 It is a schematic diagram of the structure of the switching disk of the present invention;

[0041] Fig. 9 It is a schematic diagram of the chip module structure of the present invention.

[0042] Among them: walkie-talkie housing-1, operation screen-2, button-3, dustproof net-4, conversion device-5, chip module-5a, antenna-6, indicator light-7, adjustment button-8, back clip-9, interface-10, fixing seat-51, knob-52, connecting shaft-53, supporting part-54, active bevel gear-55, driven bevel gear-56, connecting part-57, rotating cylinder-58, switching disk-59, embedded part-510, limit part-511, connecting rod-512, limit rod-55a, disk body-591, contact plate-592, scraping pad-593, transmission part-594, chip-5a1, contact disk-5a2. DETAILED DESCRIPTION

[0043] In order to further explain the technical solution of the present invention, it is described in detail below through specific embodiments.

[0044] See also Figure 1-Figure 3The present invention provides an encrypted digital intercom, comprising an intercom housing 1, an operation screen 2 is arranged at the upper end of the front end surface of the intercom housing 1, a button 3 is arranged at the lower end of the operation screen 2, a dustproof net 4 is embedded at the lower end of the front end surface of the housing 1, which is used to protect the internal speaker and microphone, a conversion device 5 is installed at the upper left end of the intercom housing 1, and three encryption methods can be converted, an antenna 6 is installed at the left end of the top of the intercom housing 1, and the bottom of the antenna 6 is connected to the conversion device 5, and the antenna 6 is disassembled and assembled by the conversion device 5, which is convenient for replacing antennas of different forms, an indicator light 7 is arranged at the middle of the top of the intercom housing 1, an adjustment button 8 for frequency modulation is arranged at the right end of the top of the intercom housing 1, a back clip 9 is locked at the upper end of the back of the intercom housing 1, an interface 10 is arranged at the lower end of the back of the intercom housing 1, the upper left end of the intercom housing 1 is connected to the bottom of the conversion device 5 through a chip module 5a, and the other end of the chip module 5a is connected to the processor inside the intercom housing 1.

[0045] See also Figure 4-Figure 7 The conversion device 5 includes a fixing seat 51 fixed to the upper left end of the intercom housing 1, a knob 52 is embedded in the middle of the left side of the fixing seat 51, a pointer is protruded on the left side of the knob 52, the left side of the fixing seat 51 is divided into four parts, and a decryption method mark can be printed on it. A connecting shaft 53 is arranged at the upper left end of the intercom housing 1, and the left side of the connecting shaft 53 passes through the fixing seat 51 to connect the knob 52, and the knob 52 can rotate with the connecting shaft 53, and the outer left end of the connecting shaft 53 is connected to the upper left end of the intercom housing 1 through a supporting member 54, and a driving bevel gear 55 is arranged on the right side of the connecting shaft 53, and the bottom of the driving bevel gear 55 is meshed with the driven bevel gear 56, and a connecting piece is arranged in the middle of the driven bevel gear 56 57. A rotating cylinder 58 that rotates with the driven bevel gear 56 is provided at the bottom, and a switching disk 59 is provided at the bottom of the rotating cylinder 58. The bottom of the switching disk 59 is in contact with the top of the chip module 5a. A socket is provided in the middle of the connecting piece 57, and an embedding piece 510 is embedded in the socket. The top of the embedding piece 510 is connected to the limiting piece 511. A limiting groove is provided on the left side of the limiting piece 511, and the lower end of the limiting groove extends to the bottom of the limiting piece 511. The top of the limiting piece 511 is connected to the bottom of the antenna 6 through a connecting rod 512. A limiting rod 55a is fixed to the lower end of the right side of the active bevel gear 55, and the limiting rod 55a is movably embedded in the limiting groove. During the rotation of the driven bevel gear 56, the connecting piece 57 is not driven to rotate.

[0046] See also Figure 8 The switching disk 59 includes a disk body 591 connected to the bottom of the rotating cylinder 58, a transmission member 594 connected to the connecting member 57 is installed in the middle of the top of the disk body 591, a contact plate 592 is installed in the middle of the bottom quarter position of the disk body 591, a metal contact is set at the bottom of the contact plate 592, and a scraping pad 593 is set at the bottom of the disk body 591 relative to the contact plate 592.

[0047] See also Fig. 9The top of the chip module 5a is divided into four parts, three of which are equipped with chips 5a1, which are AES, ECC, and RSA encryption chips respectively. The top of the chip 5a1 is connected to the contact plate 5a2, and the contact plate 5a2 contacts the bottom contact of the contact plate 592 for transmission. The other end of the chip 5a1 is connected to the control processor in the intercom.

[0048] The bottom of the antenna 6 can connect the connecting part 57 to the transmission part 594 through the embedding part 510 for data signal transmission. The transmission part 594 is connected to the contact plate 5a2 of the connecting chip 5a1 through the contact plate 592. The combined structure is equipped with electronic devices for data signal transmission.

[0049] The specific implementation process of the conversion device is as follows:

[0050] When the internal encryption chip needs to be converted, the user can rotate the knob 52 on the left side of the fixing seat 51, and the knob 52 can rotate with the connecting shaft 53, and the connecting shaft 53 rotates with the active bevel gear 55, and the driven bevel gear 56 at the bottom of the active bevel gear 55 rotates accordingly. During the rotation of the driven bevel gear 56, the rotating cylinder 58 at the bottom can rotate with the switching disk 59. During the rotation, the scraping pad 593 rotates with it, and the surface of the contact disk 5a2 can be scraped and cleaned to prevent impurities from affecting data transmission. The contact plate 592 inside the switching disk 59 rotates accordingly, and is placed on the corresponding contact disk 5a2 according to the indication of the pointer on the corresponding knob 52, and the chip 5a1 is docked to complete the conversion of the encryption method;

[0051] If the antenna 6 needs to be replaced, the user also turns the knob 52 to the corresponding mark so that the limit rod 55a is placed at the opening position at the lower end of the limit slot, and then force can be applied to the antenna 6 to pull it out for removal. When re-entering, the other antenna is also inserted, and the insert 510 at the lower end extends into the interior of the connector 57. The limit rod 55a corresponds to the limit slot, and then the knob 52 is turned to complete the installation.

[0052] The hardware components inside the intercom housing 1 are as follows:

[0053] ① Transmitter module: Digital signal processor: responsible for the acquisition, digital processing and encryption of voice signals. After the voice is converted into digital signals by the analog-to-digital converter, it is compressed, encoded and encrypted here; encryption chip: used to encrypt voice and data signals; RF transmitter: converts the encrypted digital signal into radio waves and transmits it through the antenna;

[0054] ② Receiving module: RF receiver: receives radio signals and converts them into digital signals; decryption chip: decrypts the received encrypted signals, and the original voice or data can be restored using the correct key; digital signal processor: the decrypted digital signal is decoded and processed, and finally restored to the voice signal through the digital-to-analog converter;

[0055] ③Control processor:

[0056] Main control unit: responsible for managing various functions of the walkie-talkie, such as channel switching, identity authentication, encryption key management, etc. The main control unit is also responsible for coordinating the encryption and decryption processes to ensure normal communication;

[0057] ④Memory: Storage of keys and configuration files: securely stores encryption keys and communication settings (such as frequency, channel, etc.). The key storage area usually has tamper-proof function to ensure the security of the key;

[0058] ⑤ Provide the power required by the equipment and ensure that the equipment maintains stable operation in different working states (standby, transmitting, receiving);

[0059] The software consists of the following:

[0060] ① Encryption algorithm: AES (Advanced Encryption Standard): It has the characteristics of high efficiency and strong security, and is used to encrypt voice and data; DES / 3DES (Data Encryption Standard / Triple Data Encryption Standard): Symmetric encryption algorithm; ECC (Elliptic Curve Cryptography): Asymmetric encryption algorithm used for key exchange or identity authentication, providing high security and shorter key length;

[0061] ②Key management: key generation and distribution: the key can be input by the user or automatically generated by the system. The intercom needs to distribute and manage the key before communication to ensure that the sending and receiving devices use the same key; key update: regularly update the encryption key to prevent the long-term use of the same key from reducing security;

[0062] ③ Identity authentication: Digital signature and certificate verification: Use digital certificates or preset identity tags to verify the identities of both parties in communication, ensuring that only authorized devices can participate in communication; Challenge-response mechanism: Used to authenticate the identities of devices at the beginning of communication to prevent counterfeit devices from joining the network;

[0063] ④Communication protocol: Frequency hopping: Some encrypted walkie-talkies support frequency hopping technology, and the communication signal will quickly switch between multiple frequencies to enhance anti-interference capabilities and improve the concealment of communications; Time Division Multiple Access or Frequency Division Multiple Access: used to achieve encrypted communication among multiple users on the same frequency band, improving system capacity and flexibility;

[0064] ⑤ Fault detection and processing: Monitor errors and abnormal conditions during encryption and decryption, and perform corresponding error recovery. When encryption fails, the system can choose to automatically retransmit or warn the user.

[0065] Workflow: The sending device first converts the voice signal into a digital signal through a digital processor, and the digital signal is then processed by an encryption algorithm and sent to the receiving device. After receiving the encrypted signal, the receiving device uses the stored key to decrypt it and restore the original voice or data. Before the communication begins, the devices perform two-way authentication through a preset identity authentication system, and the keys are exchanged or pre-stored through a secure encrypted channel. After completion, both parties can safely start encrypted communication.

[0066] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An encrypted digital intercom, characterized in that: It includes a walkie-talkie shell, an operation screen is arranged at the upper end of the front end surface of the walkie-talkie shell, a button is arranged at the bottom of the operation screen, a dustproof net is embedded at the lower end of the front end surface of the walkie-talkie shell, a conversion device is installed at the upper left end of the walkie-talkie shell, the bottom of the conversion device contacts the chip module, the chip module is arranged at the upper left end of the walkie-talkie shell, the conversion device contacts the chip module to realize encryption mode switching, an antenna connected to the conversion device is installed at the left end of the top of the walkie-talkie shell, an indicator light is installed at the middle of the top of the walkie-talkie shell, an adjustment button is arranged on the right side of the indicator light, a back clip is arranged at the upper end of the back of the walkie-talkie shell, and an interface is installed at the lower end of the back of the walkie-talkie shell; The conversion device includes a fixing seat arranged at the upper left end of the intercom housing, a knob arranged at the left side of the fixing seat, a connecting shaft arranged at the upper inner end of the intercom housing and connected to the knob, a supporting member arranged at the left side of the connecting shaft, a driving bevel gear connected to the right side of the connecting shaft, a driven bevel gear meshing with the bottom of the driving bevel gear, a connecting member arranged at the middle of the driven bevel gear, a rotating cylinder arranged at the bottom of the driven bevel gear, a switching disk installed at the bottom of the rotating cylinder and contacting the chip module at the bottom, an inserting member embedded in the inside of the connecting member, a limiting member arranged at the top of the inserting member, and a connecting rod arranged at the top of the limiting member and connected to the bottom of the antenna; A pointer protrudes from the left side of the knob, and the left side of the fixed seat is divided into four parts. A socket is opened in the middle of the connecting piece for the insert to extend into. A limiting groove is opened on the left side of the limit piece, and the lower end of the limiting groove extends to the bottom of the limit piece. A limiting rod is fixed to the lower end of the right side of the active bevel gear, and the limiting rod is movably embedded in the limiting groove. The switching disk includes a disk body connected to the bottom of the rotating cylinder, a contact plate arranged in the middle of the quarter position of the bottom of the disk body, a scraping pad arranged at a position relative to the contact plate, and a transmission member arranged inside the disk body and connecting the contact plate and the connecting piece. The interior of the chip module is divided into four parts, three of which are provided with chips, and a contact disk is installed at the top of the chip module corresponding to the chip position, and the contact disk is docked with the chip.

2. The encrypted digital intercom according to claim 1, characterized in that: The intercom housing is provided with an intercom hardware part and a software part. The hardware part includes: Transmitter module: Digital signal processor, responsible for the acquisition, digitization and encryption of voice signals. After the voice is converted into digital signals by the analog-to-digital converter, it is compressed, encoded and encrypted here; encryption chip, used to encrypt voice and data signals; radio frequency transmitter, converts the encrypted digital signal into radio waves and transmits it through the antenna; Receiving module: RF receiver, which receives radio signals and converts them into digital signals; decryption chip, which decrypts the received encrypted signals and uses the correct key to restore the original voice or data; digital signal processor, which decodes and processes the decrypted digital signals and finally restores them to voice signals through a digital-to-analog converter; Control processor: The main control unit is responsible for managing the various functions of the walkie-talkie, channel switching, identity authentication, encryption key management, and coordinating the encryption and decryption processes to ensure normal communication; Memory: Stores keys and configuration files. It securely stores keys and communication settings used for encryption. The key storage area has a tamper-proof function to ensure the security of the keys. The software part includes: Encryption algorithm: AES, which is highly efficient and secure, and is used to encrypt voice and data; DES / 3DES, a symmetric encryption algorithm; ECC, an asymmetric encryption algorithm used for key exchange or identity authentication, providing a high-security key length; Key management: key generation and distribution. The key is input by the user or automatically generated by the system. The intercom needs to distribute and manage the key before communication to ensure that the sending and receiving devices use the same key; key update. The encryption key is updated regularly to prevent the long-term use of the same key from reducing security; Identity authentication: digital signature and certificate verification, which verify the identities of both parties in communication through digital certificates or preset identity tags to ensure that only authorized devices can participate in communication; challenge-response mechanism, which is used to authenticate the identities of devices at the beginning of communication to prevent counterfeit devices from joining the network; Communication protocol: frequency hopping. Some encrypted walkie-talkies support frequency hopping technology. The communication signal will switch quickly between multiple frequencies to enhance anti-interference capabilities and improve the concealment of communications. Time division multiple access or frequency division multiple access is used to enable encrypted communications among multiple users on the same frequency band, thereby improving system capacity and flexibility.

3. The method for using an encrypted digital intercom according to any one of claims 1 to 2, characterized in that: The specific steps are as follows: S1 control intercom: Use the operation screen and buttons to operate the intercom. The indicator light on the top shows the current state of the intercom. Adjust the frequency by adjusting the knob on the top. S2 back clip usage and charging: Fix the back clip on the back of the walkie-talkie on your clothes to carry it, and use the interface at the bottom to connect the power supply to charge the walkie-talkie; S3 encrypted communication operation: The sending device converts the voice signal into a digital signal through a digital processor. The digital signal is encrypted by an encryption algorithm and then sent to the receiving device. The receiving device uses the stored key to decrypt the encrypted signal and restore the original voice or data. Before the communication begins, the device performs two-way authentication through a preset identity authentication system. The key is exchanged or pre-stored through a secure channel. After completing the authentication and key exchange, the two parties can conduct secure encrypted communication. S4 encryption chip conversion: Turn the knob on the left side of the fixed seat, the knob drives the connecting shaft to rotate, the connecting shaft drives the active bevel gear to rotate, the active bevel gear drives the driven bevel gear to rotate, the driven bevel gear drives the bottom rotating cylinder to rotate, the contact plate inside the switching disk docks according to the knob instruction, and the encryption mode conversion is completed; S5 antenna replacement: Turn the knob to align the limit rod with the lower opening of the limit slot, apply force to pull out the existing antenna for removal. When inserting the new antenna, align the embedded part at the bottom with the connecting part and insert it. After the limit rod enters the limit slot, turn the knob again to fix the antenna. The antenna replacement is complete.

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