CN215300615U - Vehicle-mounted dual-module group dispatching telephone system - Google Patents

Abstract

The utility model relates to a vehicle-mounted equipment technical field, concretely relates to dispatch telephone system is organized to on-vehicle bimodulus, including main GSM communication module and vice GSM communication module, main GSM communication module and vice GSM communication module with PCM passageway change over switch IC module connection, PCM passageway change over switch IC module is connected with CODEC circuit module, PCM passageway change over switch IC module and CPU processing module's IO interface communication connection, two modules can insert the network of different operators, also can insert two different network frequency channels, in main GSM communication module operator network coverage blind area, CPU processing module can cut the network into the operator network that vice GSM communication module inserted automatically, guarantee the use of on-vehicle dispatch telephone; when the network frequency band of the main GSM communication module is inconsistent with the network frequency band of the area where the main GSM communication module is located and the network cannot be accessed, the CPU processing module can cut the network into the auxiliary GSM communication module, and the vehicle-mounted dispatching telephone can be ensured to be normally used in the areas of two different network frequency bands.

Description

Vehicle-mounted dual-module group dispatching telephone system

The technical field is as follows:

the utility model relates to an on-vehicle equipment technical field, concretely relates to on-vehicle bimodulus group dispatch telephone system.

Background art:

with the continuous perfection of the related national transportation laws and the continuous enhancement of the monitoring capability of road traffic safety, the behavior of a driver calling by using a mobile phone in the driving process is forbidden obviously, particularly in the field of public transportation means, the driver is forbidden to carry the mobile phone into a cab, but due to the operation particularity of the public transportation means, a dispatcher needs to communicate with the driver in the operation process so as to realize manual dispatching of the public transportation means and improve the utilization efficiency of the public transportation means, the existing public transportation means are all provided with vehicle dispatching telephones, the vehicle dispatching telephones and one of indispensable devices of the public transportation means, the vehicle dispatching telephones used by the existing public transportation means are all single communication module dispatching telephones, although the use requirements of the public transportation means in most cities can be met, however, for some remote areas with relatively low population density and non-concentrated population distribution, due to the influence of signal coverage of an operator, a single operator network has a signal blind area, so that a vehicle-mounted dispatching telephone of a public transport means cannot be normally used in the signal coverage blind area range, and is inconvenient to use, and along with the overall promotion of economic globalization, the vehicle-mounted dispatching telephone has differences in network frequency bands of the operator in different countries and areas, so that the vehicle-mounted dispatching telephone cannot be normally used in some network frequency bands; at present, certain restriction exists on the use of the vehicle dispatching telephone.

The invention content is as follows:

in order to overcome the defects and problems, the utility model provides a vehicle-mounted dual-module dispatching telephone system, wherein two modules can be connected into networks of different operators and also can be connected into two different network frequency bands, and when the vehicle-mounted dispatching telephone cannot be normally used in a network coverage blind area of a main GSM communication module, a CPU processing module can automatically cut the network into an operator network accessed by an auxiliary GSM communication module, so that the use of the vehicle-mounted dispatching telephone is ensured; when the network frequency band of the main GSM communication module is inconsistent with the network frequency band of the area where the main GSM communication module is located and the network cannot be accessed, the CPU processing module can automatically switch the network into the auxiliary GSM communication module, and the vehicle-mounted dispatching telephone can be ensured to be normally used in the areas of two different network frequency bands.

The utility model provides a scheme that its technical problem adopted is: a vehicle-mounted dual-module dispatching telephone system comprises a CPU processing module, a main GSM communication module, an auxiliary GSM communication module, a PCM channel switch IC module, a CODEC circuit module, a SIM card module, a microphone and signal amplification circuit module, a power amplifier and loudspeaker interface module and a VGA interface touch screen, wherein the main GSM communication module is provided with a main module PCIe interface socket, the CPU processing module and the main module PCIe interface socket adopt a USB communication mode, the CPU processing module performs parameter configuration on the main GSM communication module through a USB, the main module PCIe interface socket is provided with a PCM digital voice interface, and the PCM digital voice interface is accessed to a PCM signal input end of the PCM channel switch IC module; the auxiliary GSM communication module is provided with an auxiliary module PCIe interface socket, the CPU processing module and the auxiliary module PCIe interface socket adopt a USB communication mode, the CPU processing module carries out parameter configuration on the auxiliary GSM communication module through a USB, the auxiliary module PCIe interface socket is provided with a PCM digital voice interface, and the PCM digital voice interface is accessed to a PCM signal input end of the PCM channel switch IC module; the PCM signal output end of the PCM channel switch IC module is connected to the PCM signal input end of the CODEC circuit module, the PCM channel switch IC module is in communication connection with an IO interface of the CPU processing module, the CODEC circuit module is in communication connection with the CPU processing module, and the CPU processing module controls the PCM signal of the PCIe interface socket of the main module or the PCIe interface socket of the auxiliary module to be connected to the PCM signal input end of the CODEC circuit module through the output state of the IO interface.

Furthermore, the PCIe interface socket of the main module and the PCIe interface socket of the auxiliary module are the same and are PCIe pad J1, the pins 2, 39, 41, and 52 of J1 are power access pins, the pin 19 of J1 is a power-on pin, R12, R14, and Q1 of J1 form a power-on trigger circuit, the IO interface of the CPU processing module triggers the power-on trigger circuit to perform power-on and power-off control on the main GSM communication module and the auxiliary GSM communication module; the pin 22 and the pin 23 of the J1 are reset pins, the R13, the R15 and the Q2 of the J1 form a reset trigger circuit, an IO interface of the CPU processing module triggers the reset trigger circuit to carry out reset control on the main GSM communication module and the auxiliary GSM communication module; pins 8, 10, 12 and 14 of the J1 are signal access pins of the SIM card module, pins 36 and 38 of the J1 are USB signal access pins, and the CPU processing module performs parameter configuration on the main GSM communication module and the auxiliary GSM communication module through USB; pins 45, 47, 49 and 51 of J1 are PCM signal pins, and pin 44 of J1 is an insertion detection pin of the SIM card module.

Further, the SIM card module includes a SIM card holder J5, where pins 1, 2, 3, and 6 of the J5 are signal pins of the SIM card, pins 1, 2, 3, and 6 of the J5 are connected to pins 8, 10, 12, and 14 of the J1, and pin 8 of the J5 is connected to pin 44 of the J1.

Further, the PCM channel switch IC module comprises a switching IC circuit U2, and pins 12, 13, 14, and 15 of U2 access pins 45, 47, 49, and 51 of the PCIe interface socket of the main module; the 16, 17, 18 and 20 pins of U2 access the 45, 47, 49 and 51 pins of the PCIe interface socket of the secondary module; the 3, 4, 7 and 8 pins of the U2 are connected to the PCM signal input end of the CODEC circuit module, the 9 pin of the U2 is connected with the IO interface of the CPU processing module, and the 9 pin of the U2 is a PCM channel switching control pin.

Further, the CODEC circuit module includes a CODEC integrated circuit U114, pins 21, 22, 23, and 24 of the U114 are PCM signal access pins of the CODEC, and pins 3, 4, 7, and 8 of the U2 are accessed to pins 21, 22, 23, and 24 of the U114; pins 3 and 4 of the U114 are audio signal input pins of the microphone and the signal amplification circuit module; pins 9 and 10 of U114 are audio signal output pins, and pins 26 and 27 of U114 are I2C communication interfaces of the CODEC circuit module, with which the CPU processing module is communicatively connected via an I2C communication interface.

Further, the microphone and signal amplifying circuit module comprises a microphone and an operational amplifier U48, a 2-pin microphone of the U48 is connected, and a 1-pin and a 7-pin of the U48 output a pair of amplified audio signals with a phase difference of 180 degrees and are connected to a 3-pin and a 4-pin of the U114.

Furthermore, the power amplifier and speaker interface module comprises a speaker interface, a power amplification unit and a vehicle-mounted speaker, the vehicle-mounted speaker is connected with the speaker interface, the input end of the speaker interface is connected with the pins 9 and 10 of the U114, the audio signal of the U114 is transmitted into the power amplification unit through the pins 9 and 10, and the power amplification unit performs power amplification on the audio signal and performs sound broadcasting through the vehicle-mounted speaker.

Furthermore, the VGA interface touch screen is in communication connection with the CPU processing module.

The utility model has the advantages that: the utility model discloses a main GSM communication module and vice GSM communication module are through using the network of different operators, in main GSM communication module operator network coverage blind area, when on-vehicle dispatch phone can't normally use, CPU processing module can cut into the operator network that vice GSM communication module inserts the network automatically, has solved the problem that original single module on-vehicle dispatch phone can't use in network coverage blind area; the main GSM communication module and the auxiliary GSM communication module can also be accessed to two different network frequency bands, and when the network frequency band of the main GSM communication module is inconsistent with the network frequency band of the located area and cannot be accessed to the network, the CPU processing module can automatically cut the network into the auxiliary GSM communication module, so that the vehicle-mounted dispatching telephone can be normally used in the areas of the two different network frequency bands; the CPU processing module is used for controlling the functions and the processes of the dispatching telephone, the main GSM communication module is provided with a PCIe interface socket of the main module, the CPU processing module can carry out operations such as parameter configuration, ringing message acquisition and the like on the main GSM communication module in a USB communication mode, and the PCIe interface socket of the main module is provided with a PCM digital voice interface; the auxiliary GSM communication module is provided with an auxiliary module PCIe interface socket, the CPU processing module can carry out operations such as parameter configuration, ringing message acquisition and the like on the auxiliary GSM communication module in a USB communication mode, and the auxiliary module PCIe interface socket is provided with a PCM digital voice interface; 24 signal input ends of the PCM channel switch IC module can be respectively connected to a PCM digital voice interface on a PCIe interface socket of the main module and a PCM digital voice interface on a PCIe interface socket of the auxiliary module; the signal input part that 14 way signal output part of PCM passageway change over switch IC module inserted CODEC circuit module, CODEC circuit module utilizes I2C communication interface and CPU processing module communication connection, and PCM passageway change over switch IC module utilizes PCM passageway to switch control foot and CPU processing module's IO interface connection, CPU processing module passes through the output state of IO interface and can control the PCM signal access of main module PCIe interface socket or vice module PCIe interface socket to the PCM signal input part of CODEC circuit module, realize the network switching of main GSM communication module and vice GSM communication module.

The microphone and signal amplifying circuit module can convert sound wave signals into electric signals, and transmit audio signals into the CODEC circuit module through the amplification of the operational amplifier, the CODEC circuit module can carry out analog-to-digital conversion and coding on analog voice signals output by the microphone and signal amplifying circuit module through the AD conversion function to convert the analog voice signals into PCM digital voice signals, meanwhile, the PCM digital voice signal can be converted into an analog voice signal through the DA conversion function, and transmits the audio signals to a power amplifier and loudspeaker interface module, a power amplification unit in the power amplifier and loudspeaker interface module amplifies the power of the audio signals and broadcasts the audio signals through a vehicle-mounted loudspeaker, and under the action of the VGA interface touch screen, the functions of relevant operations of making and receiving calls by touching keys, telephone parameter configuration, relevant information display and the like can be realized through the screen.

Drawings

Fig. 1 is a block diagram of the system of the present invention.

FIG. 2 is a circuit diagram of a primary and secondary module PCIe interface sockets.

Fig. 3 is a circuit diagram of the SIM card holder.

Fig. 4 is a circuit diagram of an antenna interface of a dispatch telephone set.

Fig. 5 is a circuit diagram of a PCM channel switching IC module.

Fig. 6 is a circuit diagram of a CODEC circuit block.

Fig. 7 is a circuit diagram of a microphone and a signal amplification circuit.

The specific implementation mode is as follows:

the present invention will be further explained with reference to the drawings and examples.

In embodiment 1, currently, all vehicle-mounted dispatching telephones used in public transport means are single-communication-module dispatching telephones, and although the use requirements of public transport means in most cities can be met, for some remote areas with relatively low population density and non-concentrated population distribution, due to the influence of signal coverage of an operator, a single operator network has a signal blind area, so that the vehicle-mounted dispatching telephones of the public transport means cannot be normally used in the range of the signal covered blind area, and in different countries and areas, the difference of frequency bands of the operator network exists, so that the vehicle-mounted dispatching telephones cannot be accessed to the network in some network frequency bands, and the vehicle-mounted dispatching telephones cannot be normally used.

In view of the above problems, this embodiment provides a vehicle-mounted dual-mode group dispatching telephone system, as shown in fig. 1-6, which includes a main GSM communication module and an auxiliary GSM communication module, where the two modules can access networks of different operators and also can access two different network frequency bands, the main GSM communication module and the auxiliary GSM communication module are respectively provided with a main module PCIe interface socket and an auxiliary module PCIe interface socket, the main module PCIe interface socket and the auxiliary module PCIe interface socket are the same and are PCIe socket J1, the 36 pin and 38 pin of J1 are USB signal access pins, a CPU processing module is connected with the 36 pin and 38 pin of J1 in a USB communication manner, the CPU processing module can perform operations such as parameter configuration and ringing message acquisition on the main GSM communication module and the auxiliary GSM communication module through USB signals, the 45 pin, 47 pin, 49 pin and 51 pin of J1 are PCM signal pins, that is a PCM digital voice interface, j1 outputs PCM signal through PCM digital voice interface; the pin 2, the pin 39, the pin 41 and the pin 52 of the J1 are power supply access pins, the pin 19 of the J1 is a power on pin, R12, R14 and Q1 of the J1 form a power on trigger circuit, an IO interface of the CPU processing module triggers the power on trigger circuit to perform power on and off control on the main GSM communication module and the auxiliary GSM communication module; the pin 22 and the pin 23 of the J1 are reset pins, the R13, the R15 and the Q2 of the J1 form a reset trigger circuit, an IO interface of the CPU processing module triggers the reset trigger circuit to carry out reset control on the main GSM communication module and the auxiliary GSM communication module; the pin 42 of the J1 is a network signal indicator lamp pin of the main GSM communication module and the auxiliary GSM communication module, and the network states of the main GSM communication module and the auxiliary GSM communication module can be indicated by accessing an indicator lamp LED2 of the pin 42; the pin 8, the pin 10, the pin 12 and the pin 14 of the J1 are signal access pins of the SIM card module to realize connection with the SIM card, and the pin 44 of the J1 is an insertion detection pin of the SIM card, and the main GSM communication module and the auxiliary GSM communication module can judge whether the SIM card is inserted or not by the level state of the pin 44, and send the insertion state of the SIM card to the CPU processing module by a USB signal; the SIM card module is a SIM card socket J5, pins 1, 2, 3 and 6 of J5 are signal pins of a SIM card, pins 1, 2, 3 and 6 of J5 are connected to pins 8, 10, 12 and 14 of J1, pins 8 of J5 are output pins of the SIM card in the insertion state, after the SIM card is inserted, the state of pins 8 of J5 changes, pins 8 of J5 are connected to pins 44 of J1, pins R17, R18, R19 and R20 of J5 are termination resistors, C32, C33, C34, C35 and C77 are signal terminal matching capacitors, and D2 is a TVS tube for absorbing static electricity generated in the process of inserting and extracting the SIM card.

The PCM channel switch IC module is a switch IC circuit U2, and a four-way signal input end of a U2, namely pins 12, 13, 14 and 15, is connected to pins 45, 47, 49 and 51 of a PCIe interface socket of the main module; the other four-way signal input end 16 pins, 17 pins, 18 pins and 20 pins of the U2 are connected to the 45 pins, 47 pins, 49 pins and 51 pins of the PCIe interface socket of the auxiliary module, the 3 pins, 4 pins, 7 pins and 8 pins of one four-way signal output end of the U2 are connected to the PCM signal input end of the CODEC circuit module, the 9 pins of the U2 are PCM channel switching control pins, and the 9 pins of the U2 are connected with the IO port of the CPU processing module; the CPU processing module can control the PCM signal of the PCIe interface socket of the main module or the PCIe interface socket of the auxiliary module to be accessed to the PCM signal input end of the CODEC circuit module through the output state of the IO port, thereby realizing the network switching of the main GSM communication module and the auxiliary GSM communication module and ensuring the normal use of the vehicle-mounted dispatching telephone; the CODEC circuit module is a CODEC integrated circuit U114, pins 21, 22, 23 and 24 of the U114 are PCM signal access pins of a CODEC, namely pins 21, 22, 23 and 24 of the U114 are PCM signal input ends of the CODEC circuit module, and pins 3, 4, 7 and 8 of U2 are accessed to pins 21, 22, 23 and 24 of the U114; pins 26 and 27 of U114 are I2C communication interfaces of CODEC integrated circuits, the CPU processing module is connected with the CODEC integrated circuits through I2C communication interfaces, and the CPU processing module can configure the relevant registers of the CODEC integrated circuits through I2C communication interfaces; pins 3 and 4 of the U114 are audio signal input pins of the microphone and the signal amplification circuit module; pins 9 and 10 of U114 are audio signal output pins.

The 2 pin of the operational amplifier U48 is connected with a microphone, the 1 pin and the 7 pin of the U48 output a pair of amplified audio signals with the phase difference of 180 degrees and are connected to the 3 pin and the 4 pin of the U114, the audio signals are transmitted into the CODEC integrated circuit U114, the CODEC integrated circuit U114 can carry out analog-to-digital conversion and coding on analog voice signals output by the operational amplifier U48 through an AD conversion function and convert the analog voice signals into PCM digital voice signals, and simultaneously can convert the PCM digital voice signals into analog voice signals through a DA conversion function; the vehicle-mounted loudspeaker is connected with the loudspeaker interface, the input end of the loudspeaker interface is connected with the pins 9 and 10 of the U114, the audio signal of the U114 is transmitted into the power amplification unit through the pins 9 and 10, the power amplification unit performs power amplification on the audio signal and performs sound broadcasting through the vehicle-mounted loudspeaker, the VGA interface touch screen is in communication connection with the CPU processing module, and functions such as related operations of dialing and receiving calls through touch keys, telephone parameter configuration, related information display and the like can be achieved by operating the VGA interface touch screen.

The CPU processing module is used for controlling the functions and the processes of the dispatching telephone, the main GSM communication module is provided with a PCIe interface socket of the main module, the CPU processing module can carry out operations such as parameter configuration, ringing message acquisition and the like on the main GSM communication module in a USB communication mode, and the PCIe interface socket of the main module is provided with a PCM digital voice interface; the auxiliary GSM communication module is provided with an auxiliary module PCIe interface socket, the CPU processing module can carry out operations such as parameter configuration, ringing message acquisition and the like on the auxiliary GSM communication module in a USB communication mode, and the auxiliary module PCIe interface socket is provided with a PCM digital voice interface; 24 signal input ends of the PCM channel switch IC module can be respectively connected to a PCM digital voice interface on a PCIe interface socket of the main module and a PCM digital voice interface on a PCIe interface socket of the auxiliary module; the signal input part that 14 way signal output part of PCM passageway change over switch IC module inserted CODEC circuit module, CODEC circuit module utilizes I2C communication interface and CPU processing module communication connection, and PCM passageway change over switch IC module utilizes PCM passageway to switch control foot and CPU processing module's IO interface connection, CPU processing module passes through the output state of IO interface and can control the PCM signal access of main module PCIe interface socket or vice module PCIe interface socket to the PCM signal input part of CODEC circuit module, realize the network switching of main GSM communication module and vice GSM communication module.

Embodiment 2 will be described focusing on differences from embodiment 1 in an in-vehicle dual-mode group scheduling telephone system in this embodiment.

In this embodiment, as shown in fig. 4, the IPEX antenna interfaces of the main GSM communication module and the sub GSM communication module are converted into SMA antenna interfaces for connecting the vehicle-mounted GSM antenna, and D1 is a TVS tube for absorbing static electricity generated during the antenna installation process.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement and improvement made within the spirit and principle scope of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A vehicle-mounted dual-module dispatching telephone system is characterized by comprising a CPU processing module, a main GSM communication module, an auxiliary GSM communication module, a PCM channel switch IC module, a CODEC circuit module, an SIM card module, a microphone and signal amplification circuit module, a power amplifier and loudspeaker interface module and a VGA interface touch screen, wherein the main GSM communication module is provided with a main module PCIe interface socket, the CPU processing module and the main module PCIe interface socket adopt a USB communication mode, the CPU processing module performs parameter configuration on the main GSM communication module through a USB, the main module PCIe interface socket is provided with a PCM digital voice interface, and the PCM digital voice interface is accessed to a PCM signal input end of the PCM channel switch IC module; the auxiliary GSM communication module is provided with an auxiliary module PCIe interface socket, the CPU processing module and the auxiliary module PCIe interface socket adopt a USB communication mode, the CPU processing module carries out parameter configuration on the auxiliary GSM communication module through a USB, the auxiliary module PCIe interface socket is provided with a PCM digital voice interface, and the PCM digital voice interface is accessed to a PCM signal input end of the PCM channel switch IC module; the PCM signal output end of the PCM channel switch IC module is connected to the PCM signal input end of the CODEC circuit module, the PCM channel switch IC module is in communication connection with an IO interface of the CPU processing module, the CODEC circuit module is in communication connection with the CPU processing module, and the CPU processing module controls the PCM signal of the PCIe interface socket of the main module or the PCIe interface socket of the auxiliary module to be connected to the PCM signal input end of the CODEC circuit module through the output state of the IO interface.

2. The vehicle-mounted dual-module dispatching telephone system as claimed in claim 1, wherein the PCIe interface socket of the main module and the PCIe interface socket of the auxiliary module are the same and are PCIe pad J1, pins 2, 39, 41 and 52 of J1 are power access pins, pin 19 of J1 is a power-on pin, R12, R14 and Q1 of J1 form a trigger circuit, and the IO interface of the CPU processing module triggers the power-on trigger circuit to perform power-on and power-off control on the main GSM communication module and the auxiliary GSM communication module; the pin 22 and the pin 23 of the J1 are reset pins, the R13, the R15 and the Q2 of the J1 form a reset trigger circuit, an IO interface of the CPU processing module triggers the reset trigger circuit to carry out reset control on the main GSM communication module and the auxiliary GSM communication module; pins 8, 10, 12 and 14 of the J1 are signal access pins of the SIM card module, pins 36 and 38 of the J1 are USB signal access pins, and the CPU processing module performs parameter configuration on the main GSM communication module and the auxiliary GSM communication module through USB; pins 45, 47, 49 and 51 of J1 are PCM signal pins, and pin 44 of J1 is an insertion detection pin of the SIM card module.

3. The vehicular dual-mode group scheduling telephone system according to claim 2, wherein the SIM card module comprises a SIM card socket J5, wherein pins 1, 2, 3 and 6 of J5 are signal pins of a SIM card, pins 1, 2, 3 and 6 of J5 are connected to pins 8, 10, 12 and 14 of J1, and pin 8 of J5 is connected to pin 44 of J1.

4. The vehicular dual-mode group dispatching telephone system of claim 2, wherein the PCM channel switch IC module comprises a switching IC circuit U2, and pins 12, 13, 14 and 15 of U2 are connected to pins 45, 47, 49 and 51 of a PCIe interface socket of the main module group; the 16, 17, 18 and 20 pins of U2 access the 45, 47, 49 and 51 pins of the PCIe interface socket of the secondary module; the 3, 4, 7 and 8 pins of the U2 are connected to the PCM signal input end of the CODEC circuit module, the 9 pin of the U2 is connected with the IO interface of the CPU processing module, and the 9 pin of the U2 is a PCM channel switching control pin.

5. The in-vehicle dual-mode group dispatching telephone system of claim 4, wherein the CODEC circuit module comprises CODEC integrated circuit U114, pins 21, 22, 23 and 24 of U114 are PCM signal access pins of CODEC, pins 3, 4, 7 and 8 of U2 are connected to pins 21, 22, 23 and 24 of U114; pins 3 and 4 of the U114 are audio signal input pins of the microphone and the signal amplification circuit module; pins 9 and 10 of U114 are audio signal output pins, and pins 26 and 27 of U114 are I2C communication interfaces of the CODEC circuit module, with which the CPU processing module is communicatively connected via an I2C communication interface.

6. The vehicular dual-mode group dispatching telephone system of claim 5, wherein the microphone and signal amplification circuit module comprises a microphone and an operational amplifier U48, a 2-pin microphone of U48 is connected, and a 1-pin and a 7-pin of U48 output a pair of amplified audio signals with a phase difference of 180 ° and are connected to a 3-pin and a 4-pin of U114.

7. The vehicle-mounted dual-mode group dispatching telephone system as claimed in claim 5, wherein the power amplifier and speaker interface module comprises a speaker interface, a power amplification unit and a vehicle-mounted speaker, the vehicle-mounted speaker is connected with the speaker interface, the input end of the speaker interface is connected with pins 9 and 10 of U114, the audio signal of U114 is transmitted into the power amplification unit through pins 9 and 10, and the power amplification unit performs power amplification on the audio signal and performs voice broadcast through the vehicle-mounted speaker.

8. The vehicle-mounted dual-mode group dispatching telephone system as claimed in claim 5, wherein the VGA interface touch screen is in communication connection with the CPU processing module.

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