A private network intercom and POC intercom fusion system

Abstract

The application provides a kind of fusion system of private network intercom and POC intercom, external CODEC converts analog audio into audio data stream, private network DMR vocoder packs audio data stream into 4.8K voice data;MCU control unit transmits voice data to digital baseband unit, digital baseband unit modulates voice data into 4FSK signal, radio frequency transceiver modulates 4FSK signal into carrier signal for wireless transmission, realizes private network intercom;And MCU control unit transmits voice data to POC public network module through I2S port, POC public network module transmits voice data to intercom platform after voice coding, realizes POC intercom.The application uses the same private network DMR vocoder for private network intercom and POC intercom, which can ensure that the original sound obtained during reception is the same, and there is no problem of generating two tones, while reducing the hardware structure, reducing the interference of audio transmission process by electromagnetic interference or high-speed transmission network signal interference.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a fusion system of private network intercom and POC intercom. Background Art

[0002] Currently, in public-private network convergence products, the private network system and broadband system are typically independent, each independently performing voice and data transmission, encoding, and decoding. When these two systems are converged, they are typically combined into a single system, with audio signals transmitted via serial port control, audio interfaces, and protocols, enabling interoperability between public and private networks. Consequently, complex hardware systems can cause audio transmission to be subject to electromagnetic interference or high-speed network signal interference, resulting in suboptimal audio transmission and reception. Furthermore, audio may be received in two different tones on both the public and private networks. Summary of the Invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a fusion system of private network intercom and POC intercom to overcome the defects in the prior art.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a fusion system of private network intercom and POC intercom, which includes a radio frequency transceiver, a digital baseband unit, an MCU control unit, a private network DMR vocoder, an external CODEC and a POC public network module; wherein the external CODEC is electrically connected and signal-connected to the MCU control unit, and the MCU control unit is electrically connected and signal-connected to the private network DMR vocoder; the external CODEC is used to collect analog audio from an external MIC, convert the analog audio into a first audio data stream, and transmit the first audio data stream to the MCU control unit; the external CODEC is also used to demodulate the second audio data stream or the third audio data stream from the MCU control unit into analog audio, and transmit it through a speaker; the MCU control unit is used to transmit the first audio data stream to the private network DMR vocoder; the MCU control unit is also used to transparently transmit the second audio data stream or the third audio data stream from the private network DMR vocoder to the external CODEC; the MCU control unit is also used to convert the second audio data stream or the third audio data stream from the digital baseband unit into analog audio. The first I2S voice data is transmitted to the private network DMR vocoder. The MCU control unit is further configured to transmit the second I2S voice data from the POC public network module to the private network DMR vocoder. The private network DMR vocoder is configured to filter, reduce noise, and gain control the first audio data stream, and then use an acoustic algorithm to compress and encode the data audio to package it into first 4.8K voice data, and transmit the first 4.8K voice data to the MCU control unit. The private network DMR vocoder is further configured to demodulate the first I2S voice data into a second audio data stream, and transmit the second audio data stream to the MCU control unit. The private network DMR vocoder is further configured to demodulate the second I2S voice data into a third audio data stream, and transmit the third audio data stream to the MCU control unit. The MCU control unit is electrically and signal-connected to the digital baseband unit, and the digital baseband unit is electrically and signal-connected to the RF transceiver. The MCU control unit is further configured to transmit the first 4.8K voice data to the digital baseband unit during private network intercom. The digital baseband unit is configured to convert the first 4.8K voice data into a second audio data stream, and transmit the second audio data stream to the MCU control unit.8K voice data is modulated into a first 4FSK signal, and the first 4FSK signal is transmitted to the RF transceiver; the digital baseband unit is also used to demodulate the second 4FSK signal from the RF transceiver into the first I2S voice data, and transmit the first I2S voice data to the MCU control unit; the digital baseband unit is also used to send a private network baseband reception notification to the MCU control unit; the digital baseband unit is also used to modulate the second I2S voice data into a third 4FSK signal, and transmit the third 4FSK signal to the RF transceiver; the RF transceiver is used to modulate the first 4FSK signal or the third 4FSK signal into a carrier signal for wireless transmission; the RF transceiver is also used to demodulate the second 4FSK signal in the received carrier signal, and transmit the second 4FSK signal to the digital baseband unit; the MCU control unit is electrically and signal-connected to the POC public network module through the I2S port and the PCM data port; the MCU control unit is also used to transmit the first 4.8K voice data to the POC public network module when conducting public network intercom. The data is transparently transmitted to the POC public network module through the I2S port; the MCU control unit is also used to initiate voice intercom to the POC public network module when receiving the private network baseband reception notification to obtain the intercom speech right, and the MCU control unit transmits the first I2S voice data to the POC public network module through the I2S port or the PCM data port; the MCU control unit is also used to initiate voice intercom to the private network when receiving the public network module reception notification, and the MCU control unit transmits the second I2S voice data to the digital baseband unit through the I2S port or the PCM data port; the POC public network module is used to voice encode the first 4.8K voice data and transmit it to the intercom platform to realize POC intercom; the POC public network module is also used to demodulate the voice data downloaded from the intercom platform into the second I2S voice data, and transmit the second I2S voice data to the MCU control unit through the I2S port or the PCM data port; the POC public network module is also used to send a public network module reception notification to the MCU control unit. Preferably, the private network DMR vocoder has built-in vocoder software that complies with the DMR / dPMR / PDT protocol. More preferably, the private network DMR vocoder model is WT3080, the RF transceiver model is BK4819, and the digital baseband unit model is SCT3258.

[0005] The above technical solution, which uses the same private network DMR vocoder for both private and point-of-care (POC) intercom, ensures that the original sound received by both the private and public networks is identical, eliminating the issue of two tones. It also reduces the problem of suboptimal audio transmission and reception caused by complex hardware systems, electromagnetic interference during audio transmission, or interference from high-speed network signals. The private network DMR vocoder filters, reduces noise, and performs gain control on the voice data stream. Afterwards, an acoustic algorithm compresses and encodes the data audio into 4.8KB of voice data, significantly smaller than an 8KB data stream. This reduces network transmission traffic and ensures high-fidelity audio reproduction and clarity, essentially achieving high-fidelity audio quality.

[0006] As a further explanation of the fusion system of private network intercom and POC intercom described in the present invention, preferably, the RF transceiver is used to demodulate the second 4FSK signal in the received carrier signal during private network reception, and transmit the second 4FSK signal to the digital baseband unit; then the digital baseband unit demodulates the second 4FSK signal into first I2S voice data, and transmits the first I2S voice data to the MCU control unit; then the MCU control unit transmits the first I2S voice data to the private network DMR vocoder; then the private network DMR vocoder demodulates the first I2S voice data into a second audio data stream, and transmits the second audio data stream to the MCU control unit; then the MCU control unit transmits the second audio data stream to the external CODEC; then the external CODEC demodulates the second audio data stream into analog audio, and transmits it through the speaker to complete the private network reception.

[0007] Through the above technical solution, a dedicated network reception process is realized in which the carrier signal is received by the RF transceiver, transmitted in sequence through the digital baseband unit, MCU control unit, dedicated network DMR vocoder, and external CODEC, and finally decoded into analog audio.

[0008] As a further explanation of the fusion system of private network intercom and POC intercom described in the present invention, preferably, the RF transceiver is used to demodulate the second 4FSK signal in the received carrier signal and transmit the second 4FSK signal to the digital baseband unit; then the digital baseband unit demodulates the second 4FSK signal into the first I2S voice data, and transmits the first I2S voice data to the MCU control unit, and sends a private network baseband reception notification to the MCU control unit; then, when the MCU control unit receives the private network baseband reception notification, it initiates voice intercom to the POC public network module to obtain the speaking right, and transmits the first I2S voice data to the POC public network module through the I2S port or PCM data port to complete the private network to public network voice transmission.

[0009] Through the above technical solution, the private network to public network voice transmission process is realized, in which the RF transceiver receives the carrier signal, decodes it into I2S voice data through the digital baseband unit, and transmits it to the POC public network module through the MCU control unit.

[0010] As a further explanation of the integrated system of private network intercom and POC intercom described in the present invention, preferably, the POC public network module is used to demodulate the voice data downloaded from the intercom platform into second I2S voice data, and transmit the second I2S voice data to the MCU control unit through the I2S port; then the MCU control unit transmits the second I2S voice data to the private network DMR vocoder; then the private network DMR vocoder demodulates the second I2S voice data into a third audio data stream, transmits the third audio data stream to the MCU control unit, and then the MCU control unit transmits the third audio data stream to the external CODEC; then the external CODEC demodulates the third audio data stream into analog audio, and transmits it through the speaker to complete the public network reception.

[0011] Through the above technical solution, the POC public network module receives the voice data of the intercom platform, transmits it to the private network DMR vocoder and external CODEC in sequence through the MCU control unit, and finally decodes it into the POC receiving process of analog audio.

[0012] As a further explanation of the fusion system of private network intercom and POC intercom described in the present invention, preferably, the POC public network module is used to demodulate the voice data downloaded from the intercom platform into second I2S voice data, and report the second I2S voice data to the MCU control unit through the I2S port or PCM data port, and send a public network module reception notification to the MCU control unit; then, when the MCU control unit receives the public network module reception notification, it initiates voice intercom on the private network and transmits the second I2S voice data to the digital baseband unit through the I2S port or PCM data port; then, the digital baseband unit modulates the second I2S voice data into a third 4FSK signal, and transmits the third 4FSK signal to the RF transceiver; then, the RF transceiver modulates the third 4FSK signal into a carrier signal for wireless transmission to complete the public network to private network voice transmission.

[0013] Through the above technical solution, the POC public network module receives the voice data of the intercom platform, transmits it to the digital baseband unit and the RF transceiver in sequence through the MCU control unit, and finally modulates it into a carrier signal, which is then transmitted from the private network to the public network.

[0014] As a further illustration of the integrated system of private network intercom and POC intercom described in the present invention, preferably, the MCU control unit is electrically connected and signal-connected to other external CODECs, and other external CODECs are electrically connected and signal-connected to the voice input of the external device.

[0015] Through the above technical solution, the MCU control unit is connected to other external CODECs to provide ports for back-to-back voice reception for external expansion devices, enabling voice entry from multiple platforms or communication devices, and providing protection for multi-platform voice intercommunication or long-distance networking.

[0016] As a further explanation of the fusion system of private network intercom and POC intercom described in the present invention, preferably, the MCU control unit includes an intercom control module and a voice forwarding selection module; one interface of the intercom control module is electrically connected and signal-connected with the external CODEC, and another interface of the intercom control module is electrically connected and signal-connected with the digital baseband unit and the POC public network module, and the intercom control module is used to provide a private network intercom channel or a POC intercom channel; one interface of the voice forwarding selection module is electrically connected and signal-connected with the digital baseband unit, and another interface of the voice forwarding selection module is electrically connected and signal-connected with the POC public network module, and the voice forwarding selection module is used to provide a private network to public network voice transmission channel or a public network to private network voice transmission channel.

[0017] Through the above technical solution, the external CODEC, digital baseband unit and POC public network module are connected through the intercom control module, providing a private network intercom channel and a POC intercom channel for signal transmission. The digital baseband unit and the POC public network module are connected through the voice forwarding selection module, providing a private network to public network voice transmission channel and a public network to private network voice transmission channel for signal transmission.

[0018] As a further illustration of the integrated system of private network intercom and POC intercom described in the present invention, preferably, the intercom control module realizes the switching of the private network intercom channel or the POC intercom channel through the private network PTT button or the public network PTT button.

[0019] Through the above technical solution, the switching control of the private network intercom channel is realized through the private network PTT button, and the switching control of the POC intercom channel is realized through the public network PTT button.

[0020] As a further explanation of the integrated system of private network intercom and POC intercom described in the present invention, preferably, the voice forwarding selection module realizes the switching of private network to public network voice transmission channel or public network to private network voice transmission channel through the private network baseband reception notification of the digital baseband unit or the public network module reception notification of the POC public network module.

[0021] Through the above technical solution, the switching control of the private network to public network voice transmission channel is realized by receiving notification through the private network baseband of the digital baseband unit, and the switching control of the public network to private network voice transmission channel is realized by receiving notification through the public network module of the POC public network module.

[0022] Beneficial effects of the present invention:

[0023] 1. The present invention uses the same private network DMR vocoder for private network intercom and POC intercom, which can ensure that the original sound obtained when the private network or the public network is received is the same, and the problem of the sound received by the private network or the public network having two tones will not occur. At the same time, it can also reduce the problem of unsatisfactory audio reception / transmission caused by electromagnetic interference or high-speed transmission network signal interference during the audio transmission process due to the complex hardware system.

[0024] 2. The MCU control unit of the present invention can be connected to other external CODECs to provide a port for back-to-back voice reception for external expansion devices, enabling voice input from multiple platforms or communication devices, and providing security for multi-platform voice intercommunication or long-distance networking.

[0025] 3. The present invention utilizes the private network DMR vocoder codec to encode the audio received by the analog intercom and then transmit it to the public network to initiate intercom. This can reduce the background noise of the analog intercom and ensure that the voice received by the analog receiver under weak signal conditions can be clearly transmitted to the POC to initiate the public network intercom.

[0026] 4. The present invention uses a dedicated network DMR vocoder to filter, reduce noise, and gain control the voice data stream, and then uses an acoustic algorithm program to compress and encode the data audio to package it into 4.8K voice data, which is much smaller than the 8K data stream. This can reduce network transmission traffic, and the voice restoration degree is high and clear, basically achieving a high-fidelity effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of the integrated system of private network intercom and POC intercom of the present invention;

[0028] Figure 2 Schematic diagram of the private network receiving process of the present invention;

[0029] Figure 3 Schematic diagram of the private network to public network voice transmission process of the present invention;

[0030] Figure 4 Schematic diagram of the POC receiving process of the present invention;

[0031] Figure 5 Schematic diagram of the public network to private network voice transmission process of the present invention;

[0032] Figure 6 Schematic diagram of the private network intercom channel and the POC intercom channel of the present invention;

[0033] Figure 7 Schematic diagram of the private network to public network voice transmission channel and the public network to private network voice transmission channel of the present invention. DETAILED DESCRIPTION

[0034] In order to further understand the structure, features and other purposes of the present invention, the following detailed description is given in conjunction with the attached preferred embodiments and the accompanying drawings. The embodiments described in the drawings are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention.

[0035] like Figure 1 As shown, Figure 1 This is a structural diagram of the integrated system of private network intercom and POC intercom of the present invention; a integrated system of private network intercom and POC intercom includes a radio frequency transceiver 1 (model BK4819, purchased from Broadcom Integrated Circuit (Shanghai) Co., Ltd.), a digital baseband unit 2 (using the baseband processor model SCT3258TD of CML Microcircuits), an MCU control unit 3 (using the MCU model N32G455 of National Technology Co., Ltd.), a private network DMR vocoder 4 (using the DMR vocoder model WT3080 of Nanjing Wutong Microelectronics Technology Co., Ltd.), an external CODEC 5 (using the audio codec model NAU88C22 of Nuvoton Technology Co., Ltd.) and a POC public network module 6 (using the wireless communication modules models EC20 and EC600N of Shanghai Quectel Communications Technology Co., Ltd.).

[0036] The external CODEC 5 is electrically and signal-connected to the MCU control unit 3. The external CODEC 5 collects analog audio from the external MIC 7, converts it into a first audio data stream, and transmits the first audio data stream to the MCU control unit 3. The MCU control unit 3 is electrically and signal-connected to the private network DMR vocoder 4. The MCU control unit 3 transmits the first audio data stream to the private network DMR vocoder 4. The private network DMR vocoder 4 filters, reduces noise, and performs gain control on the first audio data stream, and then uses an acoustic algorithm to compress and encode the audio data into first 4.8K voice data. The MCU control unit 3 is electrically and signal-connected to the digital baseband unit 2. When performing private network intercom, the MCU control unit 3 transmits the first 4.8K voice data packaged by the private network DMR vocoder 4 to the digital baseband unit 2; the digital baseband unit 2 is electrically and signal-connected to the RF transceiver 1, and the digital baseband unit 2 modulates the first 4.8K voice data into a first 4FSK signal, and transmits the first 4FSK signal to the RF transceiver 1. The RF transceiver 1 modulates the first 4FSK signal into a carrier signal for wireless transmission to realize private network intercom.

[0037] The MCU control unit 3 is also electrically and signal-connected to the POC public network module 6 through the I2S port and the PCM data port. When conducting public network intercom, the MCU control unit 3 transparently transmits the first 4.8K voice data packaged by the private network DMR vocoder 4 to the POC public network module 6 via the I2S port. The POC public network module 6 voice encodes the first 4.8K voice data and transmits it to the intercom platform to realize POC intercom.

[0038] It can be seen that the above-mentioned integrated system of private network intercom and POC intercom uses the same private network DMR vocoder for private network intercom and POC intercom, which can ensure that the original sound obtained when the private network or the public network is received is the same, and there will be no problem of the sound received by the private network or the public network having two tones. At the same time, it can also reduce the problem of unsatisfactory audio reception / transmission caused by electromagnetic interference or high-speed transmission network signal interference during the audio transmission process due to the complex hardware system.

[0039] The aforementioned private network DMR vocoder features built-in vocoder software compliant with the DMR / DPMR / PDT protocols. The WT3080 is a dedicated chip specifically designed for DMR / DPMR / PDT digital two-way radios. It features built-in vocoder software compliant with the DMR / DPMR / PDT protocols. DMR / DPMR / PDT digital two-way radios based on the WT3080 chip can interoperate effectively with current mainstream international DMR / DPMR / PDT systems. The WT3080 performs voice encoding and data transmission. The WT3080 filters, reduces noise, and performs gain control on the voice data stream. It then uses an acoustic algorithm to compress and encode the audio data into 4.8KB of data, significantly smaller than an 8KB data stream. This reduces network traffic and ensures high-fidelity voice reproduction and clarity, essentially achieving high-fidelity audio quality.

[0040] like Figure 1 As shown, the MCU control unit 3 can also be electrically and signal-connected to other external CODECs 9, which are in turn electrically and signal-connected to the external device voice input 10. By connecting the MCU control unit to other external CODECs, ports are provided for back-to-back voice reception on external devices, enabling voice input from multiple platforms or communication devices, ensuring multi-platform voice intercommunication or long-distance networking.

[0041] like Figure 2 As shown, Figure 2The figure is a schematic diagram of the private network reception process of the present invention. During private network reception, the RF transceiver 1 demodulates the second 4FSK signal from the received carrier signal and transmits the second 4FSK signal to the digital baseband unit 2. The digital baseband unit 2 demodulates the second 4FSK signal into first I2S voice data. The digital baseband unit 2 transmits the first I2S voice data to the MCU control unit 3. The MCU control unit 3 transmits the first I2S voice data to the private network DMR vocoder 4. The private network DMR vocoder 4 demodulates the first I2S voice data into a second audio data stream. The private network DMR vocoder 4 transmits the second audio data stream to the MCU control unit 3. The MCU control unit 3 transparently transmits the second audio data stream to the external CODEC 5. The external CODEC 5 demodulates the second audio data stream into analog audio and transmits it through the speaker 8. This implements the private network reception process in which the RF transceiver receives the carrier signal, transmits it sequentially through the digital baseband unit, the MCU control unit, the private network DMR vocoder, and the external CODEC, and finally decodes it into analog audio.

[0042] like Figure 4 As shown, Figure 4 The schematic diagram of the POC receiving process of the present invention is as follows. When receiving on the public network, the POC public network module 6 demodulates the voice data downloaded from the intercom platform into the second I2S voice data. The POC public network module 6 transmits the second I2S voice data to the MCU control unit 3 via the I2S port. The MCU control unit 3 is responsible for transmitting the second I2S voice data to the private network DMR vocoder 4. The private network DMR vocoder 4 demodulates the second I2S voice data into a third audio data stream. The private network DMR vocoder 4 transmits the third audio data stream to the MCU control unit 3. The MCU control unit 3 transmits the third audio data stream to the external CODEC 5. The external CODEC 5 demodulates the audio data stream into analog audio and transmits it through the speaker 8. This realizes the POC receiving process in which the voice data of the intercom platform is received by the POC public network module and transmitted to the private network DMR vocoder and the external CODEC in sequence via the MCU control unit, and finally decoded into analog audio.

[0043] like Figure 3 As shown, Figure 3The figure is a schematic diagram of the private network to public network voice transmission process of the present invention. When receiving on the private network, the RF transceiver 1 demodulates the second 4FSK signal in the received carrier signal, and transmits the second 4FSK signal to the digital baseband unit 2. The digital baseband unit 2 demodulates the second 4FSK signal into the first I2S voice data. The digital baseband unit 2 also notifies the MCU control unit 3 that the voice data is received and the private network is being received, that is, the digital baseband unit 2 sends a private network baseband reception notification to the MCU control unit 3. When the MCU control unit 3 receives the private network baseband reception notification, it initiates a voice intercom to the POC public network module 6 to obtain the right to speak. Then the digital baseband unit 2 transmits the first I2S voice data to the MCU control unit 3, and the MCU control unit 3 transmits the first I2S voice data to the POC public network module 6 through the I2S port or the PCM data port, completing the private network to public network voice transmission, and realizing the private network to public network voice transmission process in which the RF transceiver receives the carrier signal, decodes it into I2S voice data through the digital baseband unit, and transmits it to the POC public network module through the MCU control unit.

[0044] like Figure 5 As shown, Figure 5 This is a schematic diagram of the public network-to-private network voice transmission process of the present invention. When receiving voice data on the public network, the POC public network module 6 demodulates the voice data transmitted from the intercom platform into a second I2S voice data. The POC public network module 6 reports the second I2S voice data to the MCU control unit 3 via the I2S port or PCM data port, and notifies the MCU control unit 3 that the public network is receiving voice data. That is, the POC public network module 6 sends a public network module reception notification to the MCU control unit 3. Upon receiving the public network module reception notification, the MCU control unit 3 initiates a voice intercom on the private network. The MCU control unit 3 transmits the second I2S voice data to the digital baseband unit 2 through the I2S port or the PCM data port. The digital baseband unit 2 modulates the second I2S voice data into a third 4FSK signal. The digital baseband unit 2 transmits the third 4FSK signal to the RF transceiver 1. The RF transceiver 1 modulates the third 4FSK signal into a carrier signal for wireless transmission, completing the public network to private network voice transmission, and realizing the POC public network module receiving the voice data of the intercom platform, and transmitting the final modulated carrier signal to the digital baseband unit and the RF transceiver in sequence through the MCU control unit. The private network to public network voice transmission process.

[0045] It can be seen that the present invention utilizes the private network DMR vocoder codec to encode the audio received by the analog intercom and then transmit it to the public network to initiate intercom. This can reduce the background noise of the analog intercom and ensure that the voice received by the analog receiver under weak signal conditions can be clearly transmitted to the POC to initiate the public network intercom.

[0046] like Figure 6 and Figure 7 As shown, the MCU control unit 3 includes an intercom control module 31 and a voice forwarding selection module 32 . Figure 6 As shown in the figure, one interface of the intercom control module 31 is electrically and signal-connected to the external CODEC 5, and another interface of the intercom control module 31 is electrically and signal-connected to the digital baseband unit 2 and the POC public network module 6. The intercom control module 31 is used to provide a private network intercom channel or a POC intercom channel for signal transmission. Preferably, the intercom control module 31 switches between the private network intercom channel and the POC intercom channel using a private network PTT button or a public network PTT button. Switching control of the private network intercom channel is achieved through the private network PTT button, and switching control of the POC intercom channel is achieved through the public network PTT button. Figure 7 As shown in the figure, one interface of the voice forwarding selection module 32 is electrically connected to the digital baseband unit 2 and connected to the signal, and the other interface of the voice forwarding selection module 32 is electrically connected to the signal of the POC public network module 6. The voice forwarding selection module 32 is used to provide a private network to public network voice transmission channel or a public network to private network voice transmission channel for signal transmission. Preferably, the voice forwarding selection module 32 implements the switching of the private network to public network voice transmission channel or the public network to private network voice transmission channel by receiving a notification from the private network baseband of the digital baseband unit 2 or receiving a notification from the public network module of the POC public network module 6. The switching control of the private network to public network voice transmission channel is implemented by receiving a notification from the private network baseband of the digital baseband unit, and the switching control of the public network to private network voice transmission channel is implemented by receiving a notification from the public network module of the POC public network module.

[0047] It can be seen that the integrated system of private network intercom and POC intercom of the present invention includes a radio frequency transceiver 1, a digital baseband unit 2, an MCU control unit 3, a private network DMR vocoder 4, an external CODEC 5 and a POC public network module 6. By sharing the same private network DMR vocoder for private network intercom and POC intercom, and encoding the audio received by the analog intercom with the audio vocoder before transmitting it to the public network to initiate intercom, the background noise of the analog intercom can be reduced, ensuring that the voice received by the analog receiver under weak signals can be clearly transmitted to the POC to initiate the public network intercom. It can ensure that the original sound obtained by the private network or the public network is the same when receiving, and the problem of the sound received by the private network or the public network having two tones will not occur. At the same time, it can also reduce the problem of unsatisfactory audio reception / transmission caused by electromagnetic interference or high-speed transmission network signal interference during the transmission process of the audio due to the complex hardware system.

[0048] It should be noted that the above summary of the invention and specific embodiments are intended to demonstrate the practical application of the technical solutions provided by the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art will readily make various modifications, equivalent substitutions, or improvements within the spirit and principles of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A fusion system of private network intercom and POC intercom, characterized by: The fusion system includes a radio frequency transceiver (1), a digital baseband unit (2), an MCU control unit (3), a private network DMR vocoder (4), an external CODEC (5) and a POC public network module (6); wherein, The external CODEC (5) is electrically connected and signal-connected to the MCU control unit (3), and the MCU control unit (3) is electrically connected and signal-connected to the private network DMR vocoder (4); The external CODEC (5) is used to collect analog audio from an external MIC (7), convert the analog audio into a first audio data stream, and transmit the first audio data stream to the MCU control unit (3); the external CODEC (5) is also used to demodulate the second audio data stream or the third audio data stream from the MCU control unit (3) into analog audio, and transmit the audio through a speaker (8); The MCU control unit (3) is used to transmit a first audio data stream to a private network DMR vocoder (4); the MCU control unit (3) is also used to transparently transmit a second audio data stream or a third audio data stream from the private network DMR vocoder (4) to an external CODEC (5); the MCU control unit (3) is also used to transmit a first I2S voice data from a digital baseband unit (2) to the private network DMR vocoder (4); the MCU control unit (3) is also used to transmit a second I2S voice data from a POC public network module (6) to the private network DMR vocoder (4); The private network DMR vocoder (4) is used to filter, reduce noise, and perform gain control on the first audio data stream, and then use an acoustic algorithm program to compress and encode the data audio to package it into first 4.8K voice data, and transmit the first 4.8K voice data to the MCU control unit (3); the private network DMR vocoder (4) is also used to demodulate the first I2S voice data into a second audio data stream, and transmit the second audio data stream to the MCU control unit (3); the private network DMR vocoder (4) is also used to demodulate the second I2S voice data into a third audio data stream, and transmit the third audio data stream to the MCU control unit (3); The MCU control unit (3) is electrically connected and signal-connected to the digital baseband unit (2), and the digital baseband unit (2) is electrically connected and signal-connected to the radio frequency transceiver (1); The MCU control unit (3) is also used to transmit the first 4.8K voice data to the digital baseband unit (2) when performing a private network intercom; The digital baseband unit (2) is used to modulate the first 4.8K voice data into a first 4FSK signal, and transmit the first 4FSK signal to the radio frequency transceiver (1); the digital baseband unit (2) is also used to demodulate the second 4FSK signal from the radio frequency transceiver (1) into first I2S voice data, and transmit the first I2S voice data to the MCU control unit (3); the digital baseband unit (2) is also used to send a private network baseband reception notification to the MCU control unit (3); the digital baseband unit (2) is also used to modulate the second I2S voice data into a third 4FSK signal, and transmit the third 4FSK signal to the radio frequency transceiver (1); The radio frequency transceiver (1) is used to modulate the first 4FSK signal or the third 4FSK signal into a carrier signal for wireless transmission; the radio frequency transceiver (1) is also used to demodulate the second 4FSK signal from the received carrier signal and transmit the second 4FSK signal to the digital baseband unit (2); The MCU control unit (3) is electrically connected and signal-connected to the POC public network module (6) via the I2S port and the PCM data port; The MCU control unit (3) is further configured to transparently transmit the first 4.8K voice data to the POC public network module (6) via the I2S port when performing a public network intercom; the MCU control unit (3) is further configured to initiate a voice intercom to the POC public network module (6) upon receiving a private network baseband reception notification, so as to obtain a speech right, and the MCU control unit (3) transmits the first I2S voice data to the POC public network module (6) via the I2S port or the PCM data port; the MCU control unit (3) is further configured to initiate a voice intercom on the private network upon receiving a public network module reception notification, and the MCU control unit (3) transmits the second I2S voice data to the digital baseband unit (2) via the I2S port or the PCM data port; The POC public network module (6) is used to perform voice encoding on the first 4.8K voice data and transmit it to the intercom platform to realize POC intercom; the POC public network module (6) is also used to demodulate the voice data downloaded from the intercom platform into second I2S voice data, and transmit the second I2S voice data to the MCU control unit (3) through the I2S port or the PCM data port; the POC public network module (6) is also used to send a public network module reception notification to the MCU control unit (3); The radio frequency transceiver (1) is used to demodulate the second 4FSK signal in the received carrier signal and transmit the second 4FSK signal to the digital baseband unit (2); the digital baseband unit (2) then demodulates the second 4FSK signal into first I2S voice data, transmits the first I2S voice data to the MCU control unit (3), and sends a private network baseband reception notification to the MCU control unit (3); when the MCU control unit (3) receives the private network baseband reception notification, it initiates a voice intercom to the POC public network module (6) to obtain the intercom speech right, and transmits the first I2S voice data to the POC public network module (6) through the I2S port or the PCM data port to complete the private network to public network voice transmission; The POC public network module (6) is used to demodulate the voice data downloaded from the intercom platform into second I2S voice data, and report the second I2S voice data to the MCU control unit (3) through the I2S port or the PCM data port, and send a public network module reception notification to the MCU control unit (3); then, when the MCU control unit (3) receives the public network module reception notification, it initiates a voice intercom on the private network and transmits the second I2S voice data to the digital baseband unit (2) through the I2S port or the PCM data port; then, the digital baseband unit (2) modulates the second I2S voice data into a third 4FSK signal, and transmits the third 4FSK signal to the radio frequency transceiver (1); then, the radio frequency transceiver (1) modulates the third 4FSK signal into a carrier signal for wireless transmission, thereby completing the public network-to-private network voice transmission.

2. The integrated system of private network intercom and POC intercom as claimed in claim 1, characterized in that: The radio frequency transceiver (1) is used for demodulating a second 4FSK signal from a received carrier signal and transmitting the second 4FSK signal to a digital baseband unit (2); the digital baseband unit (2) then demodulates the second 4FSK signal into first I2S voice data and transmits the first I2S voice data to an MCU control unit (3); the MCU control unit (3) then transmits the first I2S voice data to a private network DMR vocoder (4); the private network DMR vocoder (4) then demodulates the first I2S voice data into a second audio data stream and transmits the second audio data stream to the MCU control unit (3); the MCU control unit (3) then transparently transmits the second audio data stream to an external CODEC (5); the external CODEC (5) then demodulates the second audio data stream into analog audio and transmits it through a speaker (8) to complete private network reception.

3. The integrated system of private network intercom and POC intercom according to claim 1, characterized in that: The POC public network module (6) is used to demodulate the voice data downloaded from the intercom platform into second I2S voice data, and transmit the second I2S voice data to the MCU control unit (3) through the I2S port; the MCU control unit (3) then transmits the second I2S voice data to the private network DMR vocoder (4); the private network DMR vocoder (4) then demodulates the second I2S voice data into a third audio data stream, and transmits the third audio data stream to the MCU control unit (3); the MCU control unit (3) then transmits the third audio data stream to the external CODEC (5); the external CODEC (5) then demodulates the third audio data stream into analog audio, and transmits it through the speaker (8) to complete public network reception.

4. The integrated system of private network intercom and POC intercom according to claim 1, characterized in that: The MCU control unit (3) is electrically connected and signal-connected to other external CODECs (9), and the other external CODECs (9) are electrically connected and signal-connected to the external device voice input (10), thereby providing a port for back-to-back voice reception for the external expansion device and realizing multi-platform voice intercommunication.

5. The integrated system of private network intercom and POC intercom as claimed in claim 1, characterized in that: The MCU control unit (3) includes an intercom control module (31) and a voice forwarding selection module (32); wherein, One end interface of the intercom control module (31) is electrically connected and signal-connected to the external CODEC (5), and the other end interface of the intercom control module (31) is electrically connected and signal-connected to the digital baseband unit (2) and the POC public network module (6). The intercom control module (31) is used to provide a private network intercom channel or a POC intercom channel; One end interface of the voice forwarding selection module (32) is electrically connected and signal-connected to the digital baseband unit (2), and the other end interface of the voice forwarding selection module (32) is electrically connected and signal-connected to the POC public network module (6). The voice forwarding selection module (32) is used to provide a private network-to-public network voice transmission channel or a public network-to-private network voice transmission channel.

6. The integrated system of private network intercom and POC intercom as claimed in claim 5, characterized in that: The intercom control module (31) realizes the switching of the private network intercom channel or the POC intercom channel through the private network PTT button or the public network PTT button.

7. The integrated system of private network intercom and POC intercom as claimed in claim 5, characterized in that: The voice forwarding selection module (32) realizes the switching of the private network to the public network voice transmission channel or the switching of the public network to the private network voice transmission channel through the private network baseband reception notification of the digital baseband unit (2) or the public network module reception notification of the POC public network module (6).

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