PDT and satellite voice air-ground intercommunication method and device of handheld terminal and terminal

Abstract

The invention relates to a PDT and satellite voice air-ground intercommunication method and device of a handheld terminal and the terminal, and the method comprises the following steps: S1, obtaining a satellite downlink audio stream and a local microphone audio stream, and carrying out the first-path sound mixing of the satellite downlink audio stream and the pure local human voice to generate a first mixed audio; s2, voice activity detection is carried out on the first mixed audio, a virtual PTT control signal is triggered when effective voice is detected, suspension time is adaptively adjusted based on satellite network jitter, and the first mixed audio is sent to a PDT network; s3, acquiring a PDT downlink audio stream and a local microphone audio stream, performing second-path audio mixing to generate a second mixed audio, and sending the second mixed audio to a remote command center; and S4, carrying out third-path sound mixing on the satellite downlink audio stream and the PDT downlink audio stream, and outputting to a local loudspeaker. The method has the beneficial effects that the load of an individual soldier is greatly reduced, voice word loss and interruption are avoided, echoes can be effectively eliminated, and PTT trigger delay is remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of communication technology, specifically to a method, apparatus, and terminal for PDT (Power Delivery Device) interoperability between a handheld terminal and satellite voice communication. Background Technology

[0002] In emergency communication scenarios such as forest fire prevention and earthquake rescue, the field tactical network typically uses PDT digital walkie-talkies for local communication, while the remote backhaul network uses satellite communication to communicate with the command center. Network interoperability usually relies on dedicated gateway equipment, but these devices are bulky, costly, and poorly portable.

[0003] In existing technologies, ordinary handheld terminals cannot automatically relay voice messages, requiring manual repetition, which leads to large delays and information distortion. Furthermore, in terms of audio processing, simple bridging is prone to echo feedback. Additionally, the difference in standards between satellite full-duplex mode and PDT half-duplex mode causes voice interruption issues. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application proposes a method, device, and terminal for PDT (Power Delivery Time) communication between a handheld terminal and satellite voice communication, which greatly reduces the workload of individual soldiers, avoids dropped words and interruptions in voice, effectively eliminates echo, and significantly reduces PTT trigger latency.

[0005] The following is the technical solution of the present invention: a method for interoperability between a handheld terminal's PDT and satellite voice communication, comprising the following steps: S1. Establish an uplink mixing and forwarding link, acquire satellite downlink audio stream and local microphone audio stream, perform acoustic echo cancellation on local microphone audio stream to obtain pure local human voice, and perform first-channel mixing of satellite downlink audio stream and pure local human voice to generate first mixed audio. S2. Perform voice activity detection on the first mixed audio. When valid voice is detected, trigger the virtual PTT control signal and adaptively adjust the hang-up time based on satellite network jitter. Activate the transmission function of the PDT communication module through the virtual PTT control signal to send the first mixed audio to the PDT network. S3. Establish a downlink mixing return link, acquire the PDT downlink audio stream and the local microphone audio stream, perform a second mixing to generate a second mixed audio, and send the second mixed audio to the remote command center through the satellite communication module; S4. Establish a local fusion monitoring link, mix the satellite downlink audio stream and the PDT downlink audio stream in a third channel, and output the audio to the local speaker.

[0006] As a preferred embodiment of the present invention, in S1, the acoustic echo cancellation processing adopts the normalized least mean square adaptive filtering algorithm, using the output signal of the local speaker as the reference signal.

[0007] As a preferred embodiment of the present invention, in S2, the speech activity detection includes short-time energy and zero-crossing rate analysis of the mixed audio.

[0008] As a preferred embodiment of the present invention, adaptive adjustment of the hangup time based on satellite network jitter includes: If the satellite signal jitter is less than or equal to 50ms, the virtual PTT hang time is 200ms; If the satellite signal jitter is greater than 50ms, the virtual PTT hang time will be 500ms to 800ms.

[0009] As a preferred embodiment of the present invention, in S3, when the audio stream energy of the local microphone is greater than the threshold -20dB, the volume of the PDT audio stream is reduced by 50%.

[0010] A handheld terminal PDT and satellite voice communication device, comprising: The application processor module is used to schedule audio routing and execute control logic; The PDT communication module is used for voice transmission and reception in the PDT network and connects to the application processor module. The satellite communication module is used for voice transmission and reception in satellite networks and connects to the application processor module. The audio input module is used to capture local voice data and connect to the application processor module. The audio output module is used to play audio and connects to the application processor module; The application processor module includes a virtual mixer unit, an acoustic echo cancellation unit, a voice activity detection unit, an adaptive hang-time control unit, an anti-jitter buffer unit, and a sidetone ducking unit.

[0011] As a preferred embodiment of the present invention, the virtual mixer unit includes: The first mixing subunit is used for the uplink relay link to mix the satellite audio stream with clean native vocals; The second mixing subunit is used for the downlink backhaul link to mix the PDT audio stream and the microphone audio stream; The third mixing subunit is used for local monitoring, mixing the satellite audio stream and the PDT audio stream.

[0012] As a preferred embodiment of the present invention, the acoustic echo cancellation unit is used to process the audio stream from the local microphone; A voice activity detection unit is used to detect voice activity and trigger a virtual PTT (Public Toll-Free) session. An adaptive hang-time control unit is used to adjust the PTT hang-time according to network jitter; Anti-jitter buffer unit for smoothing satellite audio stream; Sidetone ducking unit reduces the volume of the PDT audio stream based on the energy of the microphone audio stream.

[0013] As a preferred embodiment of the present invention, the PDT communication module is connected to the application processor module through a UART interface, supporting half-duplex PTT mode; The satellite communication module connects to the application processor module via a UART interface, supports Tiantong or low-Earth orbit satellites, and adopts full-duplex or half-duplex mode. The audio input module includes a microphone array and is connected to the application processor module via an I2S interface; The audio output module includes a speaker and is connected to the application processor module via an I2S interface.

[0014] A terminal includes: a memory and a processor; Memory, storing at least one instruction; The processor executes instructions stored in the memory to implement the PDT and satellite voice communication method of any of the handheld terminals described in the present invention.

[0015] The beneficial effects of this invention are: 1. In this invention, only a handheld terminal is required, eliminating the need to carry expensive dedicated gateway equipment, which greatly reduces the workload of individual soldiers; 2. In this invention, the first character loss rate is low, and the number of interruptions is significantly reduced by adaptive suspension, which solves the technical problem of intermittent transmission of PDT driven by continuous voice in satellite phones and avoids voice word loss and interruption. 3. In this invention, echo can be effectively eliminated, PTT triggering delay is significantly reduced, and the uplink backhaul link mixes the local microphone and PDT received audio, enabling the remote command center to simultaneously grasp the reporter's voice and the on-site background communication. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the device of the present invention; Figure 2 This is a schematic diagram of the application processor module of the device of the present invention; Figure 3 This is a diagram illustrating the steps of the method of the present invention; Figure 4 This is a flowchart of the method of the present invention; Figure 5 This is a diagram of the uplink mixing and forwarding link in the method of the present invention; Figure 6 This is a diagram of the downlink mixing and backhaul link for the method of this invention; Figure 7 This is a local fusion monitoring link diagram of the method of the present invention; In the diagram: 1. Application processor module; 101. Virtual mixer unit; 102. Acoustic echo cancellation unit; 103. Voice activity detection unit; 104. Adaptive hang-up time control unit; 105. Anti-jitter buffer unit; 106. Sidetalk ducking unit; 2. PDT communication module; 3. Satellite communication module; 4. Audio input module; 5. Audio output module. Detailed Implementation

[0017] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: As Figure 1 and Figure 2 As shown, a handheld terminal PDT and satellite voice communication device includes: Application processor module 1 is used to schedule audio routing and execute control logic; PDT communication module 2 is used for voice transmission and reception in the PDT network and is connected to application processor module 1; Satellite communication module 3 is used for voice transmission and reception in the satellite network and is connected to application processor module 1; Audio input module 4 is used to collect local voice and is connected to application processor module 1; Audio output module 5 is used to play audio and is connected to application processor module 1; Application processor module 1 includes a virtual mixer unit 101, an acoustic echo cancellation unit 102, a voice activity detection unit 103, an adaptive hang-up time control unit 104, an anti-jitter buffer unit 105, and a side-dodge unit 106, wherein: The virtual mixer unit 101 is integrated into the application processor module 1 and includes a first mixing subunit, a second mixing subunit, and a third mixing subunit. Acoustic echo cancellation unit 102 is used to process the audio stream from the local microphone; Voice activity detection unit 103 is used to detect voice activity and trigger virtual PTT; The adaptive hang-time control unit 104 is used to adjust the PTT hang-time according to network jitter. Anti-jitter buffer unit 105 is used to smooth the satellite audio stream; Sidetone ducking unit 106 reduces the volume of the PDT audio stream based on the energy of the microphone audio stream.

[0019] In this embodiment, application processor module 1 is used to schedule audio routing and execute control logic. Application processor module 1 runs the Android system to process and schedule audio data, and it is connected to PDT communication module 2 and satellite communication module 3 via a UART interface.

[0020] The application processor module 1 includes a virtual mixer unit 101, an acoustic echo cancellation unit 102, a voice activity detection unit 103, an adaptive hang-time control unit 104, an anti-jitter buffer unit 105, and a sidetone ducking unit 106.

[0021] The virtual mixer unit 101 includes three mixing subunits, wherein the first mixing subunit is used for the uplink forwarding link to mix the satellite audio stream and the clean local voice; the second mixing subunit is used for the downlink backhaul link to mix the PDT audio stream and the microphone audio stream; and the third mixing subunit is used for local monitoring to mix the satellite audio stream and the PDT audio stream.

[0022] The acoustic echo cancellation unit 102 is used to process the local microphone audio stream. The acoustic echo cancellation unit 102 adopts the normalized least mean square (NLMS) algorithm, uses the speaker output as the reference signal, processes the microphone audio stream, eliminates the echo of satellite downlink sound, and outputs a clean local human voice.

[0023] The speech activity detection unit 103 is used to detect speech activity and trigger a virtual PTT, perform short-time energy and zero-crossing rate analysis on the mixed audio, detect valid speech, and trigger a virtual PTT signal.

[0024] The adaptive hang-up time control unit 104 is used to adjust the PTT hang-up time according to network jitter. It monitors satellite network jitter in real time and dynamically adjusts the PTT hang-up time to prevent voice interruptions. The default hang-up time is 200ms. When the satellite network jitter is greater than 50ms, the hang-up time is extended to 500ms.

[0025] The anti-jitter buffer unit 105 is used to smooth the satellite audio stream. A buffer is set at the satellite audio input end, and its size is dynamically adjusted between 60-300ms according to the network conditions to ensure the continuity of the audio stream.

[0026] The sidetone dodging unit 106 reduces the volume of the PDT audio stream based on the energy of the microphone audio stream, prioritizing the transmission of native voice. In the downlink backhaul link, when the energy of the microphone audio stream is detected to exceed a threshold of -20dB, the volume of the PDT audio stream is automatically attenuated, prioritizing the transmission of native voice.

[0027] In this embodiment, the PDT communication module 2 is connected to the application processor module 1 via a UART interface for voice transmission and reception in the PDT network. The PDT communication module 2 adopts a digital intercom module and supports half-duplex PTT mode.

[0028] In this embodiment, the satellite communication module 3 is connected to the application processor module 1 via a UART interface for voice transmission and reception over the satellite network. The satellite communication module 3 supports Tiantong or low-Earth orbit satellites and employs full-duplex or half-duplex modes.

[0029] In this embodiment, the audio input module 4 is used to collect the user's voice. The audio input module 4 is equipped with a microphone array, which is connected to the application processor module 1 via an I2S interface to collect the user's voice stream.

[0030] In this embodiment, the audio output module 5 is used to play audio. The audio output module 5 is equipped with a speaker, which is connected to the application processor module 1 via an I2S interface to ensure that the holder can simultaneously listen to two-way voice communication.

[0031] Example 2: Figures 3 to 7 As shown, a method for PDT (Power Delivery Device) communication between a handheld terminal and satellite voice communication includes the following steps: S1. Establish an uplink mixing and forwarding link to acquire the satellite downlink audio stream and the local microphone audio stream; perform acoustic echo cancellation on the local microphone audio stream to obtain a clean local voice; perform a first-channel mixing of the satellite downlink audio stream and the clean local voice to generate the first mixed audio. S2. Perform voice activity detection on the first mixed audio. When valid voice is detected, trigger the virtual PTT control signal and adaptively adjust the hang-up time based on satellite network jitter. Activate the transmission function of PDT communication module 2 through the virtual PTT control signal to send the first mixed audio to the PDT network. S3. Establish a downlink mixing return link, acquire the PDT downlink audio stream and the local microphone audio stream, perform a second mixing, and generate a second mixed audio; send the second mixed audio to the remote command center through satellite communication module 3; S4. Establish a local fusion monitoring link, mix the satellite downlink audio stream and the PDT downlink audio stream in a third channel, and output the audio to the local speaker.

[0032] In step S1, an uplink mixing and forwarding link is established to acquire the satellite downlink audio stream and the local microphone audio stream; acoustic echo cancellation processing is performed on the local microphone audio stream to obtain clean local voice; the satellite downlink audio stream and the clean local voice are mixed in the first channel to generate the first mixed audio, including the following steps: S101. Establish an uplink mixing and forwarding link to acquire the satellite downlink audio stream and the local microphone audio stream; An uplink mixing and forwarding link is established, and application processor module 1 acquires the satellite downlink audio stream and the local microphone audio stream.

[0033] S102. Perform acoustic echo cancellation processing on the local microphone audio stream to obtain pure local human voice; The acoustic echo cancellation unit 102 uses a normalized least mean square adaptive filtering algorithm, taking the local speaker output signal as a reference signal, to perform echo cancellation processing on the local microphone audio stream, filtering out the satellite downlink sound cost, and obtaining a pure local human voice.

[0034] S103. Mix the satellite downlink audio stream with the clean local voice in the first channel to generate the first mixed audio; The satellite downlink audio stream and clean local voice are mixed in the first channel to generate the first mixed audio, ensuring that the on-site PDT group can hear both the command center's instructions and the voice of the device owner.

[0035] In step S2, voice activity detection is performed on the first mixed audio. When valid voice is detected, a virtual PTT control signal is triggered, and the hang-up time is adaptively adjusted based on satellite network jitter. The transmission function of PDT communication module 2 is activated through the virtual PTT control signal to send the first mixed audio to the PDT network, including the following steps: S201. Perform voice activity detection on the first mixed audio. When valid voice is detected, trigger the virtual PTT control signal and adaptively adjust the hang-up time based on the satellite network jitter. The speech activity detection unit 103 performs short-time energy and zero-crossing rate analysis on the mixed audio; The adaptive hang-up time control unit 104 monitors the packet loss rate and jitter of the satellite link in real time. If the satellite signal jitter is less than or equal to 50ms, the hang-up time is set to the default hang-up time of 200ms. If the detected satellite signal jitter is greater than 50ms, the hang-up time of the virtual PTT is adjusted from 500ms to 800ms to prevent intermittent PTT transmission caused by uneven arrival of satellite voice packets. The expression is as follows: , In the above formula, For the suspension time, Due to satellite signal jitter, This represents the maximum value of the satellite signal jitter. In this embodiment, ms.

[0036] S202. Activate the transmission function of PDT communication module 2 through virtual PTT control signal to send the first mixed audio to PDT network; The virtual PTT activates the PDT communication module 2, sending the first mixed audio to the field PDT group, thus enabling the forwarding of remote commands to the field.

[0037] In step S3, a downlink mixing return link is established, the PDT downlink audio stream and the local microphone audio stream are acquired, a second mixing is performed, and a second mixed audio is generated; the second mixed audio is then sent to the remote command center via satellite communication module 3, including: S301. Establish a downlink mixing return link and obtain the PDT downlink audio stream and the local microphone audio stream; A downlink mixing return link is established, and the application processor module 1 receives the downlink audio stream of the PDT group in the field, while the microphone array acquires the audio stream from the local microphone.

[0038] S302: Real-time monitoring of the audio stream energy of the local microphone; if it exceeds the limit, the volume of the PDT audio stream is reduced. The side-tone dodging unit 106 monitors the voice energy of the local microphone audio stream in real time. When it detects that the energy of the strong voice input from the user exceeds the threshold of -20dB, it automatically reduces the volume of the PDT audio stream by 50% to ensure that the remote command center can hear the user's report first, while retaining the PDT background sound as an environmental situation reference.

[0039] S303, Perform the second-channel mixing to generate the second mixed audio; The second mixing unit mixes the PDT downlink audio stream and the native microphone audio stream to generate a second mixed audio.

[0040] S304. The second mixed audio is sent to the remote command center via satellite communication module 3.

[0041] In step S4, a local fusion monitoring link is established, and the satellite downlink audio stream and the PDT downlink audio stream are mixed in a third-channel manner and output to the local speaker, including: A local fusion monitoring link is established, and the third mixing unit mixes the satellite downlink audio stream and the PDT downlink audio stream to generate a third mixed audio, which is then output to the speaker for user monitoring. The speaker receives and plays a third mixed audio signal, ensuring that the user hears both the satellite link and the PDT link simultaneously, without missing any information from either side.

[0042] Example 3: This example provides a terminal, which may be a handheld terminal. The handheld terminal is a smart terminal based on the Android operating system, including: a memory and a processor; Memory, storing at least one instruction; The processor executes instructions stored in the memory to implement any one or more steps in the PDT and satellite voice communication method of the handheld terminal in Embodiment 2.

[0043] Example 4: This example provides an application scenario applicable to the terminal described in Example 3.

[0044] In forest fire fighting scenarios, frontline team members carry ordinary PDT walkie-talkies, while the squad commander carries the terminal of Example 3, which has a satellite communication module 3 and a PDT communication module 2. The remote command center establishes a connection with the terminal through the Tiantong satellite.

[0045] After activating the "ground-to-ground communication" function, the commander wears the terminal on his chest and operates the fire extinguishing equipment with both hands; The remote command center issues a retreat order. After receiving the order, the satellite communication module 3 transmits it to the commander's application processor module 1. The terminal automatically triggers a virtual PTT and forwards the order to the PDT walkie-talkies of all frontline team members within a 2km radius. The frontline team members' ordinary PDT walkie-talkies receive the retreat order simultaneously without the need for manual intervention from the commander, and the commander does not need to put down the water gun. When frontline team members call "New fire spot detected" via PDT, the commander responds "Received, handling it." The terminal mixes the two voice messages and transmits them back to the command center via satellite, allowing the command center to clearly perceive the situation on the ground.

[0046] Three schemes were set up and their performance was tested. Scheme 1 connects by directly implementing voice activation function through hardware circuitry. Scheme 2 connects by implementing multi-protocol communication through different networks. Scheme 3 is the scheme of this invention. The test items include: first word loss rate, number of interruptions, echo / howling and PTT trigger delay. The test results are shown in Table 1.

[0047] Table 1 Performance Test Table for the Solution

[0048]

[0049] In the table above, Option 1 typically requires a terminal, external wiring, and a box, with a first-character loss rate of 45%, 12 interruptions per minute, severe echo / feedback, and a PTT trigger delay of >500ms; Option 2 typically requires a backpack base station, with a first-character loss rate of 15%, 5 interruptions per minute, slight echo / feedback, and a PTT trigger delay of 200ms.

[0050] This invention requires only a handheld terminal, eliminating the need for expensive dedicated gateway equipment. A single handheld terminal enables communication between satellite and ground stations, significantly reducing the workload for individual soldiers. The first-word loss rate is less than 2%, and adaptive suspension achieves zero interruptions per minute, solving the technical challenge of intermittent PDT transmission driven by continuous voice in satellite phones, thus avoiding dropped words and interruptions. The acoustic echo cancellation unit 102 effectively eliminates echoes, and the PTT trigger delay is less than 50ms. The uplink return link mixes the local microphone and PDT receiver audio, allowing the remote command center to simultaneously monitor the reporter's voice and background communication. Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Clearly, those skilled in the art can make various alterations and variations to the invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of equivalents of the invention, the invention is also intended to include these modifications and variations.

Claims

1. A method for PDT (Power Delivery Controller) and satellite voice communication between a handheld terminal and satellite, characterized in that, Includes the following steps: S1. Establish an uplink mixing and forwarding link, acquire satellite downlink audio stream and local microphone audio stream, perform acoustic echo cancellation on local microphone audio stream to obtain pure local human voice, and perform first-channel mixing of satellite downlink audio stream and pure local human voice to generate first mixed audio. S2. Perform voice activity detection on the first mixed audio. When valid voice is detected, trigger the virtual PTT control signal and adaptively adjust the hang-up time based on satellite network jitter. Activate the transmission function of the PDT communication module through the virtual PTT control signal to send the first mixed audio to the PDT network. S3. Establish a downlink mixing return link, acquire the PDT downlink audio stream and the local microphone audio stream, perform a second mixing to generate a second mixed audio, and send the second mixed audio to the remote command center through the satellite communication module; S4. Establish a local fusion monitoring link, mix the satellite downlink audio stream and the PDT downlink audio stream in a third channel, and output the audio to the local speaker.

2. The method for PDT and satellite voice interoperability of a handheld terminal according to claim 1, characterized in that, In S1, the acoustic echo cancellation process uses a normalized least mean square adaptive filtering algorithm, with the local speaker output signal as the reference signal.

3. The method for PDT and satellite voice interoperability of a handheld terminal according to claim 1, characterized in that, In S2, speech activity detection includes short-time energy and zero-crossing rate analysis of mixed audio.

4. The method for PDT and satellite voice interoperability of a handheld terminal according to claim 1, characterized in that, Adaptive adjustment of hang time based on satellite network jitter includes: If the satellite signal jitter is less than or equal to 50ms, the virtual PTT hang time is 200ms; If the satellite signal jitter is greater than 50ms, the virtual PTT hang time will be 500ms to 800ms.

5. The method for PDT and satellite voice interoperability of a handheld terminal according to claim 1, characterized in that, In S3, when the local microphone audio stream energy is greater than the threshold -20dB, the PDT audio stream volume is reduced by 50%.

6. A handheld terminal PDT and satellite voice communication device, applicable to the handheld terminal PDT and satellite voice communication method according to any one of claims 1-5, characterized in that, include: The application processor module is used to schedule audio routing and execute control logic; The PDT communication module is used for voice transmission and reception in the PDT network and connects to the application processor module. The satellite communication module is used for voice transmission and reception in satellite networks and connects to the application processor module. The audio input module is used to capture local voice data and connect to the application processor module. The audio output module is used to play audio and connects to the application processor module; The application processor module includes a virtual mixer unit, an acoustic echo cancellation unit, a voice activity detection unit, an adaptive hang-time control unit, an anti-jitter buffer unit, and a sidetone ducking unit.

7. The handheld terminal PDT and satellite voice communication device according to claim 6, characterized in that, The virtual mixer unit includes: The first mixing subunit is used for the uplink relay link to mix the satellite audio stream with clean native vocals; The second mixing subunit is used for the downlink backhaul link to mix the PDT audio stream and the microphone audio stream; The third mixing subunit is used for local monitoring, mixing the satellite audio stream and the PDT audio stream.

8. The handheld terminal PDT and satellite voice communication device according to claim 6, characterized in that, Acoustic echo cancellation unit for processing the audio stream from the native microphone; A voice activity detection unit is used to detect voice activity and trigger a virtual PTT (Public Toll-Free) session. An adaptive hang-time control unit is used to adjust the PTT hang-time according to network jitter; Anti-jitter buffer unit for smoothing satellite audio stream; Sidetone ducking unit reduces the volume of the PDT audio stream based on the energy of the microphone audio stream.

9. A handheld terminal PDT and satellite voice communication device according to claim 6, characterized in that, The PDT communication module connects to the application processor module via a UART interface and supports half-duplex PTT mode. The satellite communication module connects to the application processor module via a UART interface, supports Tiantong or low-Earth orbit satellites, and adopts full-duplex or half-duplex mode. The audio input module includes a microphone array and is connected to the application processor module via an I2S interface; The audio output module includes a speaker and is connected to the application processor module via an I2S interface.

10. A terminal, characterized in that, include: Memory and processor; Memory, storing at least one instruction; The processor executes instructions stored in the memory to implement the PDT and satellite voice communication method for a handheld terminal as described in any one of claims 1-5.

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