CN102821204B - Portable multimedia communication device and application of portable multimedia communication device - Google Patents
Portable multimedia communication device and application of portable multimedia communication device Download PDFInfo
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Abstract
The invention discloses a portable multimedia communication device and application of the portable multimedia communication device. The portable multimedia communication device comprises a main control module, a voice signaling module, a video module and a power supply module, wherein the voice signaling module, the video module and the power supply module are respectively connected with the main control module, voice information and signaling information are transmitted between the voice signaling module and the main control module, video information is transmitted between the video module and the main control module, and the power supply module supplies electricity to all modules. The portable multimedia communication device provided by the invention has three functions including voice communication, video communication and data communication, the simultaneous work can be realized according to requirements, and the specified communication functions can be singly used through the switching.
Description
Technical Field
The present invention relates to a communication device, and more particularly, to a portable multimedia communication device and an application thereof.
Background
With the development of science and technology, portable communication devices have been increasingly integrated into our lives, and mobile phones as portable communication devices can communicate with other people at any time. However, in some special situations, such as field exploration, disaster relief, emergency rescue, emergency handling, and the like, when special functions such as voice, image, GPS positioning, and emergency help information transmission are required to be transmitted simultaneously, the general mobile communication device cannot meet such requirements.
The mobile communication device in the prior art can transmit corresponding signals, but the types of the transmitted signals are single, and the requirements of practical application cannot be met; moreover, the existing mobile communication device can not realize GPS positioning, the control center can not determine the position of the operator of the mobile communication device, and the mobile communication device is bulky, inconvenient to carry and can not meet the requirements of special occasions.
Therefore, a communication device with the characteristics of small volume, portability, integration of multiple communication means, flexible networking mode and the like is urgently needed.
Disclosure of Invention
The invention aims to provide a portable multimedia communication device integrating multiple communication means and application thereof.
The technical solution for realizing the purpose of the invention is as follows: a portable multimedia communication device comprises a main control module, a voice signaling module and a power supply module, wherein the voice signaling module and the power supply module are connected with the main control module, the main control module controls the voice signaling module to work and simultaneously receives voice information sent by the voice signaling module, and the power supply module supplies power to all the modules;
A) the main control module comprises a microprocessor and a switching power supply, and is externally connected with a display screen and a keyboard; the microprocessor receives an input signal of the keyboard and displays information sent by the voice signaling module through the display screen; the microprocessor is connected with the switching power supply to control the switching power supply to work;
B) the voice signaling module comprises a radio frequency interphone, an FSK modem, a voice signaling board CPU and a voice synthesis chip, wherein the radio frequency interphone comprises a radio frequency power amplifier and transceiver circuit, an analog interphone and a single-track audio power amplifier; a unique code ID is arranged in the voice signaling board CPU, wherein the voice signaling board CPU is respectively connected with the FSK modem, the voice synthesis chip and the analog interphone; the FSK modem is connected with the analog interphone at the same time; the voice synthesis chip is simultaneously connected with the single-track audio power amplifier;
when the mobile phone is in a sending state, the voice signaling board CPU sends a signaling to the FSK modem to be modulated into a radio frequency interphone identification signal and then the radio frequency interphone identification signal is sent out; simultaneously, transmitting the voice signals collected by the microphone;
when the mobile terminal is in a receiving state, the voice signaling board CPU receives digital signaling and voice signals sent by the outside and carries out corresponding processing on the received digital signaling; when receiving the digital voice signaling, the voice signaling board CPU sends a voice synthesis instruction to the voice synthesis chip, and the voice synthesis chip converts the digital voice signaling into a voice signal and outputs the voice signal to a single-track audio power amplifier, and the voice signal is played through a loudspeaker connected with the single-track audio power amplifier;
C) the power module comprises an electric core and a charging and discharging monitoring module, and the charging and discharging monitoring module is connected with the electric core to control the charging and discharging state of the electric core.
In a further preferred embodiment, the portable multimedia communication device further comprises a video module, wherein the video module is connected with the main control module, the main control module controls the video module to work, the video module comprises a video board CPU, a video acquisition and mpeg4 encoding board, a COFDM encoder, a mixer and a broadband power amplification module, and the video module is externally connected with a video input port. The video board CPU is connected with the video acquisition and MEPG4 coding board, the COFDM coder, the frequency mixer and the broadband power amplifier module, and controls and monitors the four modules; the video input module transmits the acquired video signals to a video acquisition and MEPG4 coding board connected with the video input module for MEPG4 coding, encrypts the video signals by adopting an AES128 mode, transmits the video signals to a COFDM coder connected with the video acquisition and MEPG4 coding board for data coding, finally connects the video input module with a broadband power amplifier module through a mixer, and finally transmits the video signals after mixing and amplifying the video signals.
In a further preferred embodiment, the portable multimedia communication device of the present invention further includes a GPS module in the voice signaling module, and the GPS module is connected to the voice signaling module CPU and transmits a location signal to the voice signaling module CPU.
Further preferably, in the portable multimedia communication device of the present invention, the switching power supply includes three types, namely, a 5V switching power supply, a 7.2V switching power supply, and a 12V switching power supply.
An application of the portable multimedia communication device is a transceiving system constructed by a main control module and a voice signaling module, and comprises two application modes, wherein the voice signaling module occupies four different frequencies:
(1) pilot frequency hair straightening mode: based on the application platform combining the portable multimedia communication device and the control center, the mode occupies three different frequencies, namely a frequency A, a frequency B and a frequency C; wherein, the frequency A is the voice emission frequency of the portable multimedia communication device, the frequency B is the frequency of the portable multimedia communication device for receiving voice and signaling, and the frequency C is the frequency of the portable multimedia communication device for sending signaling; corresponding to the portable multimedia communication device, the frequency A is the frequency of the control center for receiving the voice, the frequency B is the frequency of the control center for sending the voice and the signaling, and the frequency C is the frequency of the control center for receiving the signaling, wherein the signaling comprises the code ID, the GPS data, the voice short message, the emergency help signal, the remote kill instruction, the revival instruction and the 4800bt low-speed data transmission of the portable multimedia communication device;
(2) different-frequency differential mode: the mode occupies four different frequencies, frequency a1, frequency B1, frequency C1 and frequency D, respectively, based on the application platform of the portable multimedia communication device, the control center, the relay station X and the relay station Y combination; wherein the voice transmitting frequency of the portable multimedia communication device is frequency A1, the signaling transmitting frequency is frequency C1, and the voice and signaling simultaneous listening frequency is frequency D; the control center voice transmitting frequency is frequency C1, and the listening voice frequency is frequency B1; the frequency of the control center for transmitting the signaling is frequency C1, and the frequency of the listening signaling is frequency D; the differencing station X differents the frequency A1 to a frequency B1; the relay station Y relays the frequency C1 to the frequency D, and the signaling includes the code ID of the portable multimedia communication device, GPS data, voice message, emergency help signal, remote kill command, revival command, and 4800bt low speed data transmission.
An application of the portable multimedia communication device is a transceiving system constructed by a main control module and a video module, wherein the video module monopolizes a frequency;
and (3) video working mode: based on the application platform combining the portable multimedia communication device and the control center, the mode monopolizes one frequency, and the portable multimedia communication device receives the picture shot by the video input module, processes the received picture and sends the processed picture to the control center.
Compared with the prior art, the invention has the following remarkable advantages:
1) the portable multimedia communication device of the invention has the unique code ID for identification, and automatically sends the code ID when sending information, so that the control center can visually distinguish the working state of each portable multimedia communication device, and the defect that the existing intercom system can only identify each specific radio station by depending on the contact call number but cannot confirm the truth of the call number of the radio station although the intercom system can realize one-to-one correspondence is overcome;
2) the portable multimedia communication device is provided with the GPS module, and when the GPS module is matched with the ID code for use, the position of a user can be positioned in real time and position information is sent to an operator of the portable multimedia communication device and a control center, so that the control center can conveniently master the specific position and the working state of the portable multimedia communication device at any time;
3) the voice signaling module in the portable multimedia communication device adopts two working modes, thereby avoiding the defects of signal loss and the like caused by that a plurality of communication devices transmit signals at one frequency, and greatly reducing the conflict probability between signaling;
4) the portable multimedia communication device with the appointed ID code is paralyzed temporarily and can not work or can be recovered to be normally used through the remote killing and reviving instruction sent by the control center.
Drawings
FIG. 1 is an overall block diagram of a portable multimedia communication device according to the present invention;
FIG. 2 is a schematic block diagram of a voice signaling module;
FIG. 3 is a schematic block diagram of a video module;
FIG. 4 is a functional block diagram of a master control module;
FIG. 5 is a diagram of frequency allocation in the inter-frequency hair straightening mode;
FIG. 6 is a flow chart illustrating the transmission of voice by the portable multimedia communication device in the inter-frequency direct mode;
fig. 7 is a flowchart of signaling transmission by the control center and reception by the portable multimedia communication device in the inter-frequency direct mode;
FIG. 8 is a diagram of frequency allocation in the pilot frequency slip mode;
FIG. 9 is a flow chart of the portable multimedia communication device transmitting speech in the inter-frequency hopping mode;
fig. 10 is a flow chart of signaling sent by the control center and received by the portable multimedia communication device in the inter-frequency hopping mode.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
With reference to fig. 1, fig. 2, fig. 3, and fig. 4, a portable multimedia communication device includes a main control module, a voice signaling module, a video module, and a power module, wherein the voice signaling module, the video module, and the power module are all connected to the main control module, the main control module controls the voice signaling module and the video module to work, and simultaneously receives voice information sent by the voice signaling module, and the power module supplies power to all modules;
A) the main control module comprises a microprocessor and a switching power supply, and is externally connected with a display screen and a keyboard; the microprocessor receives an input signal of the keyboard and displays information sent by the voice signaling module through the display screen; the microprocessor is connected with the switching power supply to control the switching power supply to work; the switching power supply comprises a 5V switching power supply, a 7.2V switching power supply and a 12V switching power supply, wherein the 5V switching power supply supplies power for the keyboard and the display screen, the 7.2V switching power supply supplies power for the voice signaling module, and the 12V switching power supply supplies power for the video module; the model of the microprocessor is STM32F107VCT 6;
B) the voice signaling module comprises a radio frequency interphone, an FSK modem, a voice signaling board CPU and a voice synthesis chip, wherein the radio frequency interphone comprises a radio frequency power amplifier and transceiver circuit, an analog interphone and a single-track audio power amplifier; a unique code ID is arranged in the voice signaling board CPU, wherein the voice signaling board CPU is respectively connected with the FSK modem, the voice synthesis chip and the analog interphone; the FSK modem is connected with the analog interphone at the same time; the voice synthesis chip is simultaneously connected with the single-track audio power amplifier; the model of the CPU of the voice signaling board is STM32F103C8T6, the model of the voice synthesis chip is SYN6288, and the model of the GPS module is ET 310-SiRFIII;
when the voice signaling board is in a sending state, the CPU sends a signaling to the FSK modem to be modulated into a radio frequency interphone identification signal and then sends out the signal; simultaneously, transmitting the voice signals collected by the microphone;
when the mobile terminal is in a receiving state, the CPU of the voice signaling board receives signaling and voice sent by the outside and correspondingly processes the received signaling; when receiving the voice short message, the voice signaling board CPU sends a voice synthesis instruction to the voice synthesis chip, and the voice synthesis chip synthesizes the voice and outputs the voice to the single track audio power amplifier and plays the voice through the loudspeaker connected with the voice synthesis chip;
C) the power supply module comprises a battery cell and a charge-discharge monitoring module, and the charge-discharge monitoring module is connected with the battery cell to control the charge-discharge state of the battery cell;
D) the video module comprises a video board CPU, a video acquisition and MEPG4 coding board, a COFDM coder, a mixer and a broadband power amplification module, wherein the video module is externally connected with a video input port, the video input port receives video signals acquired by video equipment such as a helmet camera, a DV machine and the like, and the video board CPU is connected with the video acquisition and MEPG4 coding board, the COFDM coder, the mixer and the broadband power amplification module and controls and monitors the states of the four modules; the video input module transmits the acquired video signals to a video acquisition and MEPG4 coding board connected with the video input module for MEPG4 coding, encrypts the video signals by adopting an AES128 mode, transmits the video signals to a COFDM coder connected with the video acquisition and MEPG4 coding board for data coding, finally connects the video input module with a broadband power amplifier module through a mixer, and finally transmits the video signals after mixing and amplifying the video signals. The model of the video board CPU is C8051F206, the model of the video acquisition and MEPG4 coding board is PNX9520E, and the model of the COFDM coder is ALTER StratixII.
An application of portable multimedia communication device, a receiving and transmitting system constructed by a main control module and a voice signaling module, comprises two application modes, wherein the voice signaling module occupies four different frequencies:
(1) pilot frequency hair straightening mode: the application platform based on the combination of the portable multimedia communication device and the control center is shown in fig. 5, and the mode occupies three different frequencies, namely a frequency a, a frequency B and a frequency C; wherein, the frequency A is the voice emission frequency of the portable multimedia communication device, the frequency B is the frequency of the portable multimedia communication device for receiving voice and signaling, and the frequency C is the frequency of the portable multimedia communication device for sending signaling; corresponding to the portable multimedia communication device, the frequency A is the frequency of the control center for receiving the voice, the frequency B is the frequency of the control center for sending the voice and the signaling, and the frequency C is the frequency of the control center for receiving the signaling, wherein the signaling comprises the code ID, the GPS data, the voice short message, the emergency help signal, the remote kill instruction, the revival instruction and the 4800bt low-speed data transmission of the portable multimedia communication device;
(2) different-frequency differential mode: an application platform based on a combination of a portable multimedia communication device, a control center, a relay station X and a relay station Y is shown in fig. 8, and this mode occupies four different frequencies, frequency a1, frequency B1, frequency C1 and frequency D; wherein the voice transmitting frequency of the portable multimedia communication device is frequency A1, the signaling transmitting frequency is frequency C1, and the voice and signaling simultaneous listening frequency is frequency D; the control center voice transmitting frequency is frequency C1, and the listening voice frequency is frequency B1; the frequency of the control center for transmitting the signaling is frequency C1, and the frequency of the listening signaling is frequency D; the differencing station X differents the frequency A1 to a frequency B1; the relay station Y relays the frequency C1 to the frequency D, and the signaling includes the code ID of the portable multimedia communication device, GPS data, voice message, emergency help signal, remote kill command, revival command, and 4800bt low speed data transmission.
As shown in fig. 6, in the pilot frequency direct mode, the portable multimedia communication device listens at frequency B, when the PTT is pressed, the frequency is automatically switched to a, the microphone is turned on, the user's speech is received and modulated to send out, when the PTT is released, the microphone is turned off, the frequency is switched to C and a signaling is instantaneously sent, and after the signaling is completed, the frequency jumps back to B, and the signaling includes the ID code and GPS data of the portable multimedia communication device.
As shown in fig. 7, in the pilot frequency direct transmission mode, the control center sends a signaling at frequency B, the portable multimedia communication device listens at frequency B until receiving the signaling, the portable multimedia communication device determines whether to request an answer signaling, and if so, switches the frequency to C to send an answer signaling; if the reply is not needed, directly operating according to the signaling requirement (such as playing voice short messages and the like); and then continues back to frequency B listening.
As shown in fig. 9, in the inter-frequency hopping mode, the portable multimedia communication device listens at frequency D, the frequency is automatically switched to a1 when the PTT button is pressed, the microphone is turned on to receive the user's speech and modulate it, the PTT button is released to turn off the microphone, the user jumps to frequency C1 to send a signaling, and after the sending is finished, the portable multimedia communication device returns to frequency D listening, where the signaling includes the ID code and GPS data of the portable multimedia communication device.
As shown in fig. 10, in the pilot frequency error correction mode, the control center sends signaling at frequency C1, the error table Y performs error correction to frequency D, the portable multimedia communication device listens at frequency D until receiving the signaling, the portable multimedia communication device determines whether to request to answer the signaling, and if it is required to answer the signaling, the frequency is switched to C1 to send an answer signaling; if not, the portable multimedia communication device directly operates according to the signaling requirement, and finally returns the frequency D to continue listening.
An application of the portable multimedia communication device is a transceiving system constructed by a main control module and a video module, wherein the video module monopolizes a frequency;
and (3) video working mode: based on the application platform combining the portable multimedia communication device and the control center, the mode monopolizes one frequency, and the portable multimedia communication device receives the picture shot by the video input module, processes the received picture and sends the processed picture to the control center.
Carrying out the process
1. Portable multimedia communication deviceProcess for sending video
First, the video source is turned on. The portable multimedia communication device receives a video signal generated by shooting pictures by a camera, the video signal is sent to the COFDM board, the COFDM board carries out analog-to-digital conversion on the video signal, then the video signal is coded in an MPEG4 mode, the coded data is encrypted in an AES128 mode, the encrypted data is subjected to OFDM modulation, the frequency is mixed and loaded to a frequency to be transmitted, the frequency is output to a power amplifier, and a carrier signal amplified by the power amplifier is transmitted through an antenna.
And after receiving the modulation signal of the frequency, the control center image receiver performs COFDM demodulation, and the recovered data stream is subjected to AES128 decryption. And sending the decrypted data to a video decoding chip, synthesizing an original video signal, sending the original video signal to a large-screen monitor of a control center for display, and sending the original video signal to a hard disk video recorder for video recording.
Information transmission process for sending voice by portable multimedia communication device
An operator presses a PTT button on the handle, the internal communication module is switched to a transmitting mode, the MIC of the handle is switched on, and the radio frequency circuit is switched to a transmitting power amplification state. The voice collected by the MIC is modulated in an FM narrow-band mode, the modulated signal is directly mixed with a carrier signal output by the VCO to complete the loading of the signal, and the signal is sent to the radio frequency power amplifying part, and the radio frequency power amplifying part is used for linearly amplifying the signal and then sending the signal to the voice antenna to be emitted.
After the communication is finished, the PTT button is released, the system detects that the PTT is released, the MIC of the handle is immediately cut off, the frequency of the VCO is switched to the signaling emission frequency point, the GPS positioning information of the portable multimedia communication device is coded and encrypted, the encrypted data is output to the MSK modulation chip, the modulation chip outputs the modulated audio frequency, the audio frequency enters the interphone module to be subjected to FM narrowband remodulation, the FM narrowband remodulation is carried out through VCO frequency mixing, the audio frequency is transmitted to the radio frequency power amplifier, and the antenna sends a radio signaling.
The control center demodulates the audio carrier wave received by the voice frequency point to restore the original voice signal and sends the original voice signal to the loudspeaker for playing.
And the control center demodulates the data carrier wave received at the signaling frequency point to restore the audio frequency loaded with the data information. And sending the audio to an MSK modulation and demodulation chip, starting to demodulate data information after the MSK chip detects the carrier, verifying the demodulated data information, decrypting after confirming that the verification is passed, sending the decrypted data information to a GIS command system computer, extracting the data by the computer, decoding information such as an internal ID (identity) number, a timestamp, longitude and latitude and the like, and displaying the information on a screen. And calling a database for effective GPS positioning information, and marking a corresponding geographic position and an ID number on a screen map.
Flow for transmitting instruction to portable multimedia communication device by control center
And the commander selects the ID number of the multimedia communication device needing to receive the instruction in the control center, selects a specific instruction, and clicks to send the instruction. The control center encodes the user command, and the encoded data is sent to a signaling board of the control center. The signaling board encrypts the data, the encrypted data is sent to an MSK modulation chip to modulate a carrier audio signal and send the modulated carrier audio signal to a transmitting audio input, meanwhile, the signaling board operates a PTT switch of a control center to switch to a transmitting state, the sent audio signal is subjected to FM narrow-band modulation, a transmitting carrier is formed after frequency mixing, and the transmitting carrier is transmitted out through a radio frequency power amplifier and an antenna system.
The portable multimedia communication device is in a receiving state when not sending voice, demodulates after detecting the carrier signal on the frequency, demodulates and restores the audio frequency carrying the signaling data, and sends the audio frequency to the MSK demodulation chip. And after detecting the carrier, the MSK chip starts demodulation and outputs the restored data information.
The portable multimedia communication device verifies the data information, decrypts the data information after the data information is verified, and the data information is restored into an original instruction. And the CPU of the portable multimedia communication device executes corresponding actions according to the instructions. For example, sending the current self-positioning information, reading the voice short message carried by the instruction, etc.
Receiving of voice short message
Freeing both hands and minimizing voice contact is of particular significance to the operator of a mobile portable multimedia communication device. In order to facilitate communication during field exploration, disaster relief and emergency rescue and handling of emergent events, the portable multimedia communication device develops a voice short message command function. The clear voice prompt is provided by the built-in voice processing chip, the voice generating chip and the sound amplification external discharge circuit of the portable multimedia communication device. The control center dispatcher can automatically send voice command information such as 'maneuver to left', 'standby in place' and 'withdraw from base' to the portable multimedia communication device through data instructions by clicking the short message code on the menu with a mouse without using a microphone or a table microphone to talk.
Besides issuing the pre-stored voice short message to the portable multimedia communication device, the control center can also issue Chinese and English voice short messages (70 Chinese characters or 140 English characters) with random contents to the portable multimedia communication device in a keyboard operation mode.
The information transmission process of the multimedia communication device for receiving the voice short message is as follows:
after receiving the voice short message instruction of the control center, the portable multimedia communication device opens the voice synthesis chip and outputs the voice synthesis instruction, and the voice synthesis chip reads the content of the voice short message aloud and sends the voice short message aloud to the single-channel audio amplifier to be amplified and then replayed by the handle loudspeaker. And simultaneously, sending the short message character information to a screen of the portable multimedia communication device for display.
After receiving a position query instruction of a control center, the portable multimedia communication device calls current GPS positioning information, switches the frequency of a VCO to a signaling emission frequency point, encodes and encrypts the GPS positioning information, outputs the encrypted data to an MSK modulation chip, outputs the debugged audio by the modulation chip, enters a portable multimedia communication device module to perform FM narrowband remodulation, mixes the audio by the VCO, transmits the audio to a power amplifier, and sends the audio to an antenna to send a radio signaling.
Remote-controlled pesticide
The security of communication information is very important, and the loss and theft of the portable multimedia communication device occur frequently when the portable multimedia communication device is lost and stolen in field exploration, disaster relief and emergency treatment, and the loss of the portable multimedia communication device is a very serious threat to the communication confidentiality. Aiming at the condition that the portable multimedia communication device is easy to lose and be stolen in field operation, the portable multimedia communication device provides the function that the control center station sends a special coding instruction to kill the portable multimedia communication device.
Once a portable multimedia communication device is determined to be lost, a group of special codes and instructions can be sent out through the control center, if the portable multimedia communication device is in a positioned state, the portable multimedia communication device can immediately and automatically return positioning information (without pressing PTT), the control center is helped to quickly position and search for the lost portable multimedia communication device, and the portable multimedia communication device can be temporarily paralyzed according to the instruction requirement, cannot receive and transmit, and the leakage of communication secrets is avoided. After the portable multimedia communication device is recovered, the portable multimedia communication device can be recovered to normal use after being activated by remote control. The transmission flow of the remote killing information is as follows:
after the portable multimedia communication device receives the command of remote killing of control center, close the power supply of video transmitting part by force immediately, mark the sign that portable multimedia communication device was remote killed in the DRAM, close the normal output of screen simultaneously, cut off the keyboard power supply, take over handle PTT button. The whole machine only works with the receiving part of the voice module. At this time, the operator presses the PTT button, the PTT button cannot be transmitted, the keyboard is invalid, and the operation cannot be carried out. After rebooting, the portable multimedia communication device still cannot be used due to the storage of the remote kill flag.
Remote control activation
After the portable multimedia communication device receives the remote activation instruction of the control center, the remote killing mark in the memory is immediately cleared, at the moment, the operator restarts the portable multimedia communication device, and the portable multimedia communication device is initialized according to the normal flow and is recovered to be normally used.
Information transmission process for reporting local ID code to control center by portable multimedia communication device
The portable multimedia communication device automatically uploads the ID code of the device under the following three conditions:
firstly, after each call is finished, a PTT key is released;
secondly, pressing a '9' key on a panel for more than three seconds to send emergency help-seeking information;
third, the control center requests the portable multimedia communication device to report the position.
In all three cases, the portable multimedia communication device automatically uploads the ID code and GPS positioning information of the portable multimedia communication device to the control center.
The portable multimedia communication device signaling board sends a message requesting the local ID to the main control board, and the main control board replies the signaling board local ID number. After the signaling board obtains the ID, it packages the current GPS information together with the ID number in a predetermined radio signaling format and adds a check. The signaling board switches the frequency to a signaling channel, and simultaneously opens a radio frequency transmitting channel to supply power to the radio frequency power amplifier. Then the signaling board CPU sends the packed data to MSK modulation and demodulation chip according to bit, the chip immediately generates audio signal after modulating data, the audio signal is sent to analog FM modulation after attenuation combing, and mixing is carried out after modulation, and carrier waiting for emission is obtained. And finally, the carrier is sent into the prepared radio frequency power amplifier circuit and is transmitted out through the antenna. After all data of the data packet are sent to the MSK modem chip, the signaling board delays for a time, then the radio frequency power amplifier is closed, the receiving state is switched, and the whole talkback module enters a standby mode.
After receiving the transmitted carrier signal, the control center directly demodulates the audio signal carrying the data, the signal is sent to a signaling decoder of the control center to demodulate the data, and the demodulated data is checked and verified to be error-free and sent to a GIS command computer, and the ID number and the positioning information of the portable multimedia communication device can be displayed.
Portable multimedia communication device voice synthesis process
When the control center sends out the voice short message instruction, each portable multimedia communication device can receive the signal. The portable multimedia communication device automatically demodulates the signal and restores the instruction content of the control center. And then checking whether the ID number in the instruction is the same as the ID number in the instruction, if not, directly discarding the instruction, and entering a standby state. If the ID number is consistent, the length and the specific content of the voice short message are extracted, the voice synthesis chip is awakened, then the voice short message is packaged again according to the instruction format of the synthesis chip, and the voice short message is sent to the voice synthesis chip through the internal bus.
The voice synthesis chip starts to work, synthesized voice is output, a loudspeaker in the handle is pushed through a final-stage audio power amplifier, and the portable multimedia communication device completes a voice synthesis playback process.
Emergency help-seeking process
The portable multimedia communication device has the function of sending the emergency help-seeking information, and the portable multimedia communication device automatically sends the emergency help-seeking information when the number key 9 of the keyboard is pressed for more than three seconds in the state that the main interface is displayed on the liquid crystal screen. The emergency help information includes the following contents: the ID number of the machine, GPS positioning information and the current time. The sending channel is a signaling channel set by the system.
The sending process is automatically sent once every 10 seconds, and the sending process is automatically sent 6 times in total. And then automatically returns to the standby state.
Once the control center receives the emergency help-seeking signal on the signaling channel, the ID number and the GPS coordinate of the information are immediately displayed on an interface of a GIS system in a striking mode, and meanwhile, the map is automatically moved to the area where the ID is located.
After the control center processes the emergency help-seeking information, the operator can select to close the information, and the GIS is switched to a normal working mode.
10. Low speed data transmission
With the portable multimedia communication device, 4800bt low speed data transmission is possible. Through the data transmission interface, the portable multimedia communication device is connected with the notebook computer, and 4800bt low-speed data transmission can be realized.
Claims (6)
1. A portable multimedia communication device is characterized by comprising a main control module, a voice signaling module and a power supply module, wherein the voice signaling module and the power supply module are connected with the main control module, the main control module controls the voice signaling module to work and simultaneously receives voice information sent by the voice signaling module, and the power supply module supplies power to all the modules;
A) the main control module comprises a microprocessor and a switching power supply, and is externally connected with a display screen and a keyboard; the microprocessor receives an input signal of the keyboard and displays information sent by the voice signaling module through the display screen; the microprocessor is connected with the switching power supply to control the switching power supply to work;
B) the voice signaling module comprises a radio frequency interphone, an FSK modem, a voice signaling board CPU and a voice synthesis chip, wherein the radio frequency interphone comprises a radio frequency power amplifier and transceiver circuit, an analog interphone and a single-track audio power amplifier; a unique code ID is arranged in the voice signaling board CPU, wherein the voice signaling board CPU is respectively connected with the FSK modem, the voice synthesis chip and the analog interphone; the FSK modem is connected with the analog interphone at the same time; the voice synthesis chip is simultaneously connected with the single-track audio power amplifier;
when the voice signaling board is in a sending state, the CPU sends a signaling to the FSK modem to be modulated into a radio frequency interphone identification signal and then sends out the signal; simultaneously, transmitting the voice signals collected by the microphone;
when the mobile terminal is in a receiving state, the CPU of the voice signaling board receives signaling and voice sent by the outside and correspondingly processes the received signaling; when receiving the voice short message, the voice signaling board CPU sends a voice synthesis instruction to the voice synthesis chip, and the voice synthesis chip synthesizes the voice and outputs the voice to the single track audio power amplifier and plays the voice through the loudspeaker connected with the voice synthesis chip;
C) the power supply module comprises a battery cell and a charge-discharge monitoring module, and the charge-discharge monitoring module is connected with the battery cell to control the charge-discharge state of the battery cell;
wherein,
the transceiving system constructed by the main control module and the voice signaling module comprises two application modes, wherein the voice signaling module occupies four different frequencies:
(1) pilot frequency hair straightening mode: based on the application platform combining the portable multimedia communication device and the control center, the mode occupies three different frequencies, namely a frequency A, a frequency B and a frequency C; wherein, the frequency A is the voice emission frequency of the portable multimedia communication device, the frequency B is the frequency of the portable multimedia communication device for receiving voice and signaling, and the frequency C is the frequency of the portable multimedia communication device for sending signaling; corresponding to the portable multimedia communication device, the frequency A is the frequency of the control center for receiving the voice, the frequency B is the frequency of the control center for sending the voice and the signaling, and the frequency C is the frequency of the control center for receiving the signaling, wherein the signaling comprises the code ID, the GPS data, the voice short message, the emergency help signal, the remote kill instruction, the revival instruction and the 4800bt low-speed data transmission of the portable multimedia communication device;
(2) different-frequency differential mode: the mode occupies four different frequencies, frequency a1, frequency B1, frequency C1 and frequency D, respectively, based on the application platform of the portable multimedia communication device, the control center, the relay station X and the relay station Y combination; wherein the voice transmitting frequency of the portable multimedia communication device is frequency A1, the signaling transmitting frequency is frequency C1, and the voice and signaling simultaneous listening frequency is frequency D; the control center voice transmitting frequency is frequency C1, and the listening voice frequency is frequency B1; the frequency of the control center for transmitting the signaling is frequency C1, and the frequency of the listening signaling is frequency D; the differencing station X differents the frequency A1 to a frequency B1; the relay station Y relays the frequency C1 to the frequency D, and the signaling comprises the code ID of the portable multimedia communication device, GPS data, voice short message, emergency help signal, remote kill instruction, reviving instruction and 4800bt low-speed data transmission;
the receiving and transmitting system is constructed by a main control module and a video module, wherein the video module monopolizes one frequency:
and (3) video working mode: based on the application platform combining the portable multimedia communication device and the control center, the mode monopolizes one frequency, and the portable multimedia communication device receives the video image input by the video input port, processes the received video image and sends the processed video image to the control center.
2. The portable multimedia communication apparatus according to claim 1, wherein the analog interphone is provided with a talk handle comprising a microphone, a headphone and a PTT button.
3. The portable multimedia communication device of claim 1, further comprising a GPS module connected to the voice signaling board CPU for transmitting a location signal.
4. The portable multimedia communication device of claim 1, further comprising a video module, wherein the video module is connected to the main control module, the main control module controls the operation of the video module, the video module comprises a video board CPU, a video acquisition and mpeg4 encoding board, a COFDM encoder, a mixer modulator, and a broadband power amplification module, wherein the video module is externally connected with a video input port, the video board CPU is connected to the video acquisition and mpeg4 encoding board, the COFDM encoder, the mixer modulator, and the broadband power amplification module, and controls and monitors the state of the four modules; the video input module transmits the acquired video signals to a video acquisition and MEPG4 coding board connected with the video input module for MEPG4 coding, encrypts the video signals by adopting an AES128 mode, transmits the video signals to a COFDM coder connected with the video acquisition and MEPG4 coding board for data coding, finally connects the video input module with a broadband power amplification module through a mixing modulator, and finally transmits the video signals after mixing and amplifying the video signals.
5. The portable multimedia communication device according to claim 4, further comprising a GPS module connected to the voice signaling board CPU for transmitting the location signal.
6. The portable multimedia communication apparatus according to claim 4, wherein the switching power supply comprises three of a 5V switching power supply, a 7.2V switching power supply and a 12V switching power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210283369.9A CN102821204B (en) | 2012-08-10 | 2012-08-10 | Portable multimedia communication device and application of portable multimedia communication device |
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| CN201210283369.9A CN102821204B (en) | 2012-08-10 | 2012-08-10 | Portable multimedia communication device and application of portable multimedia communication device |
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| CN103067146B (en) * | 2013-01-25 | 2016-04-20 | 上海德思普微电子技术有限公司 | A kind of data transmission method and device |
| CN110083221A (en) * | 2014-06-09 | 2019-08-02 | 威盛电子股份有限公司 | Electronic device and audio frequency playing method |
| CN104363118A (en) * | 2014-11-12 | 2015-02-18 | 成都千嘉科技有限公司 | Multi-mode communication hand-held device, management system and method based on community management |
| CN104601926A (en) * | 2015-01-08 | 2015-05-06 | 清华大学 | Information interaction system between people and animals |
| KR20170086869A (en) * | 2016-01-19 | 2017-07-27 | 삼성전자주식회사 | Method and apparatus for transmitting video during voice call |
| CN109511147A (en) * | 2019-01-09 | 2019-03-22 | 福建环球通通讯有限公司 | A kind of intercom automatic roaming system and method |
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| CN1964471A (en) * | 2006-01-05 | 2007-05-16 | 宁波大学 | 2.4G public frequency band digital visual interphone and method to process audio image |
| CN200994172Y (en) * | 2006-12-22 | 2007-12-19 | 东莞市特唯数码科技有限公司 | Visiual telephone set |
| CN101616504A (en) * | 2008-06-26 | 2009-12-30 | 浙江家泰电器制造有限公司 | Hand-held communication terminal |
| CN201491091U (en) * | 2009-07-21 | 2010-05-26 | 深圳市保利天同通讯设备有限公司 | Digital interphone |
| CN202121733U (en) * | 2011-07-26 | 2012-01-18 | 东莞市世纪特卫安防有限公司 | Interphone system |
| CN102291630A (en) * | 2011-07-26 | 2011-12-21 | 东莞市世纪特卫安防有限公司 | Interphone system |
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