A system and method for answering a phone call and a voice intercom based on a headset charging case

Abstract

The application relates to the fields of audio equipment and communication technology, and particularly discloses a system and method for answering a phone call and voice intercom based on an earphone charging bin, wherein the system comprises: an earphone charging bin, the earphone charging bin comprising a battery, a main control module, a Bluetooth module, an audio acquisition module, a sound playing module and an interactive key module, the Bluetooth module, the audio acquisition module, the sound playing module and the interactive key module being electrically connected with the main control module; a mobile communication terminal, the mobile communication terminal being installed with an intercom application program; the earphone charging bin is wirelessly connected with the mobile communication terminal through the Bluetooth module, and the earphone charging bin generates a phone call control instruction or a voice intercom control instruction in response to a triggering operation of a user through the interactive key module; the application effectively solves the problems of single function, complicated communication operation and lagging response of the existing earphone charging bin.

Description

Technical Field

[0001] This invention relates to the field of audio equipment and communication technology, specifically to a system and method for answering phone calls and voice communication based on an earphone charging case. Background Technology

[0002] With the rapid development of mobile communication technology, wireless audio devices, and smartphones, Bluetooth headsets have become an essential electronic product in people's daily work and life. Bluetooth headsets are usually sold together with their charging cases. Currently, most headphone charging cases on the market only offer basic functions of storing and charging Bluetooth headsets, making their functionality relatively limited.

[0003] However, as users' demands for portability, interaction efficiency, and adaptability to various scenarios continue to rise, the functional limitations of existing earphone charging cases are becoming increasingly apparent. In daily use, users often face the following problems: when Bluetooth earphones are worn in the ear, answering calls or making voice calls is relatively convenient, but the earphones often cannot respond to communication needs in a timely manner due to insufficient battery, being stored in the charging case, or not being worn by the user. At this time, users have to take out their phone, unlock the screen, and enter the call interface to operate, or take out the earphones again and complete the wearing and connection. The whole process is cumbersome and has a delayed response, which seriously affects the user experience and safety, especially when driving, exercising, holding objects, or in emergencies.

[0004] On the other hand, with the widespread use of walkie-talkie applications in scenarios such as office work, logistics, security, and outdoor operations, users' demands for "one-click response," "instant use," and "hands-free calling" are becoming increasingly strong. Existing earphone charging cases only serve as passive charging and storage containers and cannot actively participate in audio signal processing and communication control. As a result, users still rely on their mobile phones or other terminals to complete call answering and walkie-talkie operations when not wearing earphones, failing to fully realize the collaborative potential of wireless audio devices.

[0005] Furthermore, current Bluetooth earphones and charging cases typically only connect via physical contacts for charging, underutilizing their data transfer capabilities and lacking intelligent designs such as call answering control, intercom response control, identity binding, and interactive mapping based on the charging case. Even in some high-end products that add simple buttons to the charging case, these are mostly for checking battery level or pairing earphones, failing to truly expand the charging case into an independent audio interaction terminal.

[0006] Based on the aforementioned shortcomings, there is an urgent need for a system and method that can upgrade the earphone charging case into an independent audio interaction terminal, supporting hands-free answering, voice intercom, quick response, and signal relay, so as to realize the transformation of the earphone charging case from a "passive charging carrier" to an "active communication terminal" and meet users' needs for fast, convenient, and secure communication in multiple scenarios. Summary of the Invention

[0007] The purpose of this invention is to provide a system and method for answering phone calls and voice communication based on an earphone charging case, aiming to improve the problems of existing earphone charging cases having limited functionality, resulting in inconvenience for users to communicate, delayed response, and poor adaptability to different scenarios when the Bluetooth earphone is not worn or is unavailable.

[0008] This invention is implemented as follows: According to a first aspect of the present invention, the present invention provides a system for answering phone calls and voice intercom based on an earphone charging case, comprising: The earphone charging case includes a battery, a main control module, a Bluetooth module, an audio acquisition module, a sound playback module, and an interactive button module. The Bluetooth module, the audio acquisition module, the sound playback module, and the interactive button module are all electrically connected to the main control module. A mobile communication terminal, on which a walkie-talkie application is installed; The earphone charging case establishes a wireless communication connection with the mobile communication terminal through the Bluetooth module. The earphone charging case responds to the user's trigger operation through the interactive button module, generates a call answering control command or a voice intercom control command, and sends it to the mobile communication terminal through the Bluetooth module to control the mobile communication terminal to perform the corresponding call answering operation or voice intercom operation. The earphone charging case collects the user's voice through the audio acquisition module and plays the received voice signal through the sound playback module to realize the voice interaction function.

[0009] Furthermore, the earphone charging case has an electrical component mounting cavity, in which the battery, main control module, Bluetooth module, audio acquisition module, and sound playback module are all disposed. The main control module includes a main control circuit board and an MCU chip disposed on the main control circuit board. The audio acquisition module includes a microphone and a sound acquisition hole on the earphone charging case housing corresponding to the microphone position. The sound playback module includes a speaker and a sound emission hole on the earphone charging case housing corresponding to the speaker position. The speaker includes at least one of a mid-range speaker, a subwoofer, and a tweeter.

[0010] Furthermore, the interactive button module includes at least one PTT button and at least one hands-free answer button. The PTT button is used to generate voice intercom control commands in response to user trigger operations to achieve quick reply or answer functions. When multiple PTT buttons are set, the multiple PTT buttons correspond to different quick reply content or different answer objects. The hands-free answer button is used to generate call answer control commands in response to user trigger operations to achieve hands-free answer function.

[0011] Furthermore, the earphone charging case also includes a display screen, which is disposed on the shell of the earphone charging case and electrically connected to the main control module; the display screen can be used to display an identification code, and the intercom application binds and authenticates itself with the earphone charging case by scanning the identification code.

[0012] Furthermore, the mobile communication terminal can be any one of a smartphone, tablet computer, smartwatch, or vehicle-mounted terminal.

[0013] Furthermore, the system also includes at least one Bluetooth headset, which is connected to the headset charging case via Bluetooth signal communication. When the Bluetooth headset is being worn, the headset charging case acts as a signal transceiver base station, wirelessly transmitting the received voice signal to the Bluetooth headset for playback, and collecting user voice through the Bluetooth headset.

[0014] Furthermore, the main control module also includes a signal processing unit, which is electrically connected to the MCU chip and is used to perform noise reduction, amplification, and encoding processing on the user voice signal acquired by the audio acquisition module, as well as decoding and amplification processing on the voice signal sent by the mobile communication terminal. The signal processing unit uses an adaptive filtering algorithm to achieve noise reduction processing, and the adaptive filtering algorithm includes the LMS adaptive equalization algorithm.

[0015] Furthermore, the iterative formula for the LMS adaptive equalization algorithm is as follows:

[0016] in, Let n be the filter coefficient vector at time n. Step size factor (0 < <1), Let be the error signal at time n. Let n be the input signal vector at time n. The signal processing unit achieves adaptive noise reduction by updating the filter coefficients in real time.

[0017] According to a second aspect of the present invention, the present invention provides a method for answering phone calls and engaging in voice communication based on an earphone charging case, applied to the aforementioned system for answering phone calls and engaging in voice communication based on an earphone charging case, comprising the following steps: S1. Establish a wireless communication connection between the earphone charging case and the mobile communication terminal; S2. Receive the user's trigger operation through the interactive button module on the earphone charging case, and generate a call answering control command or a voice intercom control command. S3. Send the control command to the mobile communication terminal to control the mobile communication terminal to perform the corresponding telephone answering operation or voice intercom operation; S4. The user's voice is collected by the audio acquisition module of the earphone charging case, and the received voice signal is played by the sound playback module of the earphone charging case to realize the voice interaction function.

[0018] Furthermore, the earphone charging case also includes a display screen, which is electrically connected to the main control module; prior to step S1, it also includes: S0. The identification code is displayed on the screen, and the walkie-talkie application on the mobile communication terminal scans the identification code to bind and authenticate with the earphone charging case.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates the interactive button module, audio acquisition module, and sound playback module into the earphone charging case, and establishes a wireless communication connection with the mobile communication terminal using the Bluetooth module. This enables hands-free operation of answering calls and making voice conversations directly through the earphone charging case when the user is not wearing the Bluetooth earphone, effectively solving the problems of limited functionality, cumbersome communication operation, and slow response of existing earphone charging cases.

[0020] 2. This invention enables rapid association between the device and the user's identity by displaying an identification code on a screen and completing the scanning and binding authentication in conjunction with a walkie-talkie application, thereby improving the convenience and security of use.

[0021] 3. This invention also supports the collaborative work of Bluetooth earphones and earphone charging case. When the user wears Bluetooth earphones, the earphone charging case can act as a signal transceiver base station to achieve seamless switching of voice interaction, fully meeting the fast, convenient and safe communication needs in multiple scenarios such as driving, sports, and outdoor work. Attached Figure Description

[0022] Figure 1 This is a structural block diagram of the system for answering phone calls and voice communication based on an earphone charging case provided by the present invention; Figure 2 This is a block diagram of the electronic control structure of the earphone charging case of the present invention; Figure 3 This is a three-dimensional structural diagram of the earphone charging case of the present invention; Figure 4 This is a flowchart of the method for answering phone calls and voice communication based on an earphone charging case provided by the present invention.

[0023] 1. Earphone charging case; 2. PTT button; 3. Hands-free answer button; 4. Display screen. Detailed Implementation

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details: Example 1

[0026] like Figure 1 As shown, this embodiment provides a system for answering phone calls and voice intercom based on an earphone charging case, including an earphone charging case 1, a mobile communication terminal, and a Bluetooth earphone. The mobile communication terminal can be any of a smartphone, tablet, smartwatch, or in-vehicle terminal, and is pre-installed with an intercom application for voice intercom functionality, such as the MicroPhoenix Intercom APP. The Bluetooth earphone and the mobile communication terminal establish a stable wireless communication connection with the earphone charging case 1 via Bluetooth signal, and the three work together to complete the entire process of answering phone calls, voice intercom, and voice interaction.

[0027] like Figure 2 and Figure 3 As shown, the earphone charging case 1 serves as the core control and signal relay carrier of the entire system. Its shell has an electrical component mounting cavity, which integrates a battery, main control module, Bluetooth module, audio acquisition module, and sound playback module. All these components are electrically connected to the main control module. The earphone charging case 1 also features an interactive button module electrically connected to the main control module, a display screen 4, a charging port, a settings button, and a power switch. The charging port connects to an external power source to charge the battery. The power switch controls the overall power supply of the earphone charging case 1. The settings button allows adjustment of basic functions such as display screen brightness and Bluetooth connection mode. All external components are electrically connected to the main control module and are centrally controlled by it.

[0028] The main control module, serving as the control core of the earphone charging case 1, includes a main control circuit board and an MCU chip soldered onto the main control circuit board. It also integrates a signal processing unit, electrically connected to the MCU chip. This signal processing unit is a key component for optimizing audio signal processing. It can perform noise reduction, amplification, and encoding of the user's voice signal acquired by the audio acquisition module, and can also decode and amplify the voice signal transmitted from the mobile communication terminal. To improve noise reduction, the signal processing unit employs an adaptive filtering algorithm, with the LMS adaptive equalization algorithm as its core. This algorithm adaptively cancels environmental noise by updating the filter coefficients in real time. The iterative formula is as follows:

[0029] in, Let n be the filter coefficient vector at time n. The step size factor is defined as 0 < μ < 1, and its value is limited to this range. This range ensures the convergence and noise reduction efficiency of the algorithm. Let be the error signal at time n, obtained from the difference between the desired signal and the filter output signal. Let be the input signal vector at time n, which is the noisy speech signal vector acquired by the audio acquisition module. During actual operation, the signal processing unit acquires the input signal at a sampling frequency of 44.1kHz. After each sampling, the filter coefficients are updated using the iterative formula described above, generating a cancellation signal with equal amplitude and opposite phase to the noise signal. This cancellation signal is then superimposed on the noisy speech signal to achieve noise reduction. After processing by this algorithm, the noise suppression ratio of the speech signal can reach 25-35dB, effectively improving the clarity of speech acquisition and playback.

[0030] Signal amplification employs a GaAs low-noise amplifier (LNA) to amplify the noise-reduced audio signal. The amplifier gain formula is as follows:

[0031] in, This represents the amplifier gain (dB). For output signal voltage, As the input signal voltage, the amplifier gain is set to 20dB and the noise figure is ≤2dB in this embodiment to ensure that the signal strength meets the requirements for transmission and playback.

[0032] The encoding and decoding adopts a PPM-PCM dual-mode encoding method. When the signal distortion rate exceeds 5%, the encoding mode is automatically switched. The signal distortion rate calculation formula is:

[0033] in, For signal distortion rate, The number of signal sampling points. The original signal, It is a distorted signal; when When switching to PPM coding mode, At that time, PCM encoding mode is used.

[0034] The audio acquisition module includes a microphone and a sound acquisition port. The sound acquisition port is located on the shell of the earphone charging case 1, precisely corresponding to the microphone's mounting position to ensure that external voice signals can be smoothly transmitted to the microphone. The microphone is a high-sensitivity model, capable of accurately acquiring the user's voice signal and transmitting the acquired analog voice signal to the signal processing unit of the main control module for further processing. The sound playback module includes a speaker and a sound output port. The sound output port is also located on the shell of the earphone charging case 1, corresponding to the speaker's mounting position. The speaker can be any one or more combinations of mid-range speakers, subwoofers, and tweeters, depending on actual usage needs. The voice signal, decoded and amplified by the signal processing unit, is transmitted to the speaker and played outwards through the sound output port to meet the user's voice listening needs.

[0035] like Figure 3 As shown, the interactive button module includes at least one PTT button 2 and at least one hands-free answer button 3. Both types of buttons are located on the shell of the earphone charging case 1. The PTT button 2 is used for quick voice intercom operation. When the user triggers the button, a trigger signal is transmitted to the main control module. The main control module then generates a voice intercom control command and sends the command to the intercom application of the mobile communication terminal via the Bluetooth module, realizing quick reply or answer function. If multiple PTT buttons 2 are set in actual use, each button will correspond to different quick reply content or different answer objects. Users can customize the content corresponding to each button through the intercom application of the mobile communication terminal. The hands-free answer button 3 is used to realize quick hands-free answering of telephone calls. When the mobile communication terminal receives an incoming call, the incoming call signal is transmitted to the main control module of the earphone charging case 1 via the Bluetooth module. The main control module then drives the sound playback module to emit a prompt tone. At this time, the user triggers the hands-free answer button 3, and the main control module generates a call answering control command and sends it to the mobile communication terminal to complete the hands-free answering of the telephone. No user operation of the mobile communication terminal is required, improving the convenience of operation.

[0036] like Figure 3As shown, display screen 4 is an OLED screen, mounted on the surface of the earphone charging case 1 and electrically connected to the main control module. One of its core functions is to display an identification code, which is a unique QR code. When the earphone charging case 1 first establishes a connection with a mobile communication terminal, the user can scan this QR code using the intercom application on the mobile communication terminal to complete the binding authentication between the intercom application and the earphone charging case 1. After the binding authentication is completed, the two can establish a stable wireless communication connection via Bluetooth module, and no repeated authentication is required in subsequent uses; pairing is automatic upon power-on. Simultaneously, display screen 4 can also display the remaining battery power and charging status of the earphone charging case 1, Bluetooth connection status, intercom information, etc., in real time, allowing users to monitor the device's operation.

[0037] In practical use, this system allows for flexible switching between two voice interaction modes. When the user is not wearing a Bluetooth headset, they can directly answer calls and conduct voice conversations through the headset charging case 1. In this case, the audio acquisition module of the headset charging case 1 captures the user's voice, processes it through the signal processing unit, and sends it to the mobile communication terminal via the Bluetooth module. The voice signal received by the mobile communication terminal is then transmitted back to the headset charging case 1 for playback by the sound playback module. When the user is wearing a Bluetooth headset, the headset charging case 1 acts as a signal relay base station, transmitting the voice signal from the mobile communication terminal to the Bluetooth headset via the Bluetooth module. The Bluetooth headset then plays the voice signal. Simultaneously, the user's voice signal captured by the Bluetooth headset is transmitted to the headset charging case 1, processed by the main control module, and then sent to the mobile communication terminal, achieving two-way voice interaction. This design effectively expands the system's usage scenarios and meets the user's communication needs in different states.

[0038] Example 2

[0039] This embodiment provides a method for answering phone calls and engaging in voice communication based on an earphone charging case, applied to the system for answering phone calls and engaging in voice communication based on an earphone charging case provided in Embodiment 1, such as... Figure 4 As shown, this method includes the following steps: S0. Display the identification code on the display screen 4. The intercom application on the mobile communication terminal scans the identification code to bind and authenticate with the earphone charging case 1: After turning on the switch button of the earphone charging case 1, the main control module will drive the display screen 4 to display the unique identification code. The user scans the identification code through the intercom application (Weifeng Intercom APP) on the mobile communication terminal to complete the binding and authentication between the two.

[0040] S1. Establish a wireless communication connection between the earphone charging case 1 and the mobile communication terminal: After authentication, the Bluetooth module of the earphone charging case 1 will automatically establish a wireless communication connection with the mobile communication terminal. If the connection is unexpectedly interrupted, the main control module will start the reconnection mechanism and attempt to reconnect within 3 seconds. After 3 consecutive failures, the Bluetooth module will enter the discoverable mode, and the display screen 4 will display a connection failure message.

[0041] S2. The user's trigger operation is received through the interactive button module on the earphone charging case 1, and a call answering control command or voice intercom control command is generated: When the mobile communication terminal receives a call or needs to conduct a voice intercom, the user triggers the interactive button module on the earphone charging case 1 shell, namely the hands-free answering button 3 or the PTT button 2. The interactive button module will transmit the trigger signal to the main control module. The main control module generates the corresponding call answering control command or voice intercom control command according to different trigger signals, and sends the control command to the mobile communication terminal through the Bluetooth module.

[0042] S3. Send control commands to the mobile communication terminal to control the mobile communication terminal to perform the corresponding telephone answering operation or voice intercom operation: After receiving the command, the mobile communication terminal will immediately perform the corresponding telephone answering operation or voice intercom operation; During the entire communication process, the audio acquisition module of the earphone charging case 1 will collect the user's voice in real time, process it after the signal processing unit of the main control module, and send it to the mobile communication terminal. At the same time, the voice signal received by the mobile communication terminal will be transmitted to the earphone charging case 1 and played by the sound playback module.

[0043] S4. The user's voice is collected by the audio acquisition module of the earphone charging case 1 and played back by the sound playback module of the earphone charging case 1 to achieve voice interaction. When the user wears the Bluetooth earphones, the earphone charging case 1 automatically switches to signal transceiver base station mode, sending the received voice signal to the Bluetooth earphones for playback via the Bluetooth module, and collecting the user's voice through the Bluetooth earphones, achieving seamless switching of voice interaction. Throughout the entire call or conversation, the user does not need to remove the mobile communication terminal; the entire process can be completed solely through the earphone charging case 1, effectively improving the convenience and safety of use in scenarios such as driving and sports.

[0044] In summary, this invention integrates the interactive button module, audio acquisition module, and sound playback module into the earphone charging case 1, and establishes a wireless communication connection with the mobile communication terminal using the Bluetooth module. This enables hands-free operation of answering calls and conducting voice conversations directly through the earphone charging case 1 when the user is not wearing the Bluetooth earphone, effectively solving the problems of limited functionality, cumbersome communication operations, and delayed response in existing earphone charging cases.

[0045] Meanwhile, by displaying an identification code on screen 4 and completing the scanning and binding authentication with the intercom application, the device and user identity are quickly linked, improving convenience and security. Furthermore, this invention supports the collaborative operation of the Bluetooth headset and the charging case 1. When the user wears the Bluetooth headset, the charging case 1 can act as a signal relay base station, enabling seamless switching of voice interaction and fully meeting the fast, convenient, and secure communication needs in various scenarios such as driving, sports, and outdoor work.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for answering phone calls and voice communication based on an earphone charging case, characterized in that, include: The earphone charging case includes a battery, a main control module, a Bluetooth module, an audio acquisition module, a sound playback module, and an interactive button module. The Bluetooth module, the audio acquisition module, the sound playback module, and the interactive button module are all electrically connected to the main control module. A mobile communication terminal, on which a walkie-talkie application is installed; The earphone charging case establishes a wireless communication connection with the mobile communication terminal through the Bluetooth module. The earphone charging case responds to the user's trigger operation through the interactive button module, generates a call answering control command or a voice intercom control command, and sends it to the mobile communication terminal through the Bluetooth module to control the mobile communication terminal to perform the corresponding call answering operation or voice intercom operation. The earphone charging case collects the user's voice through the audio acquisition module and plays the received voice signal through the sound playback module to realize the voice interaction function.

2. The system for answering phone calls and voice communication based on an earphone charging case according to claim 1, characterized in that, The earphone charging case has an electrical component mounting cavity, in which the battery, main control module, Bluetooth module, audio acquisition module, and sound playback module are all housed. The main control module includes a main control circuit board and an MCU chip mounted on the main control circuit board. The audio acquisition module includes a microphone and a sound acquisition hole on the earphone charging case housing corresponding to the microphone position. The sound playback module includes a speaker and a sound emission hole on the earphone charging case housing corresponding to the speaker position. The speaker includes at least one of a midrange speaker, a subwoofer, and a tweeter.

3. The system for answering phone calls and voice communication based on the earphone charging case according to claim 1, characterized in that, The interactive button module includes at least one PTT button and at least one hands-free answer button. The PTT button is used to generate voice intercom control commands in response to user trigger operations to achieve quick reply or answer functions. When multiple PTT buttons are set, the multiple PTT buttons correspond to different quick reply content or different answer objects. The hands-free answer button is used to generate call answer control commands in response to user trigger operations to achieve hands-free answer function.

4. The system for answering phone calls and voice communication based on an earphone charging case according to claim 1, characterized in that, The earphone charging case also includes a display screen, which is mounted on the shell of the earphone charging case and electrically connected to the main control module. The display screen can be used to display an identification code, and the intercom application binds and authenticates itself with the earphone charging case by scanning the identification code.

5. The system for answering phone calls and voice communication based on an earphone charging case according to claim 1, characterized in that, The mobile communication terminal can be any one of a smartphone, tablet computer, smartwatch, or vehicle-mounted terminal.

6. The system for answering phone calls and voice communication based on an earphone charging case according to claim 1, characterized in that, The system also includes at least one Bluetooth headset, which is connected to the headset charging case via Bluetooth signal communication. When the Bluetooth headset is being worn, the headset charging case acts as a signal transceiver base station, wirelessly transmitting the received voice signal to the Bluetooth headset for playback, and collecting user voice through the Bluetooth headset.

7. The system for answering phone calls and voice communication based on an earphone charging case according to claim 2, characterized in that, The main control module also includes a signal processing unit, which is electrically connected to the MCU chip. The signal processing unit is used to perform noise reduction, amplification, and encoding processing on the user voice signal acquired by the audio acquisition module, as well as decoding and amplification processing on the voice signal sent by the mobile communication terminal. The signal processing unit uses an adaptive filtering algorithm to achieve noise reduction processing, and the adaptive filtering algorithm includes the LMS adaptive equalization algorithm.

8. The system for answering phone calls and voice communication based on an earphone charging case according to claim 7, characterized in that, The iterative formula for the LMS adaptive equalization algorithm is: in, Let n be the filter coefficient vector at time n. Step size factor (0 < <1), Let be the error signal at time n. Let n be the input signal vector at time n. The signal processing unit achieves adaptive noise reduction by updating the filter coefficients in real time.

9. A method for answering phone calls and engaging in voice communication based on an earphone charging case, applied to the system for answering phone calls and engaging in voice communication based on an earphone charging case as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Establish a wireless communication connection between the earphone charging case and the mobile communication terminal; S2. Receive the user's trigger operation through the interactive button module on the earphone charging case, and generate a call answering control command or a voice intercom control command. S3. Send the control command to the mobile communication terminal to control the mobile communication terminal to perform the corresponding telephone answering operation or voice intercom operation; S4. The user's voice is collected by the audio acquisition module of the earphone charging case, and the received voice signal is played by the sound playback module of the earphone charging case to realize the voice interaction function.

10. The method for answering phone calls and voice communication based on an earphone charging case according to claim 9, characterized in that, The earphone charging case also includes a display screen, which is electrically connected to the main control module; prior to step S1, it also includes: S0. The identification code is displayed on the screen, and the walkie-talkie application on the mobile communication terminal scans the identification code to bind and authenticate with the earphone charging case.

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