CN213339293U - Modern communication principle comprehensive experiment device - Google Patents

Modern communication principle comprehensive experiment device Download PDF

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Publication number
CN213339293U
CN213339293U CN202021600271.8U CN202021600271U CN213339293U CN 213339293 U CN213339293 U CN 213339293U CN 202021600271 U CN202021600271 U CN 202021600271U CN 213339293 U CN213339293 U CN 213339293U
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experimental
power supply
coding
wireless communication
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崔维新
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North China Electric Power University
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North China Electric Power University
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Abstract

The utility model provides an experimental apparatus is synthesized to modern communication principle, including main control unit (10), touch-sensitive screen display ware (11), wireless communication unit (12), USB ethernet interface (13), outside AD acquisition element (14), user interface unit (15), DDS signal source (16), speech coding/decoding unit (17), exchange and signaling unit (18), multiple access/shunting unit (19), HDB3/AMI coding unit (20), Hamming coding/decoding unit (21), special power supply (22), network camera (23) and portable audio amplifier (24) etc. main control unit (10) are realized through special power supply (22) to the control of network camera (23) and portable audio amplifier (24). The utility model discloses experimental apparatus satisfies long-range real-time online teaching needs, satisfies the needs of diversified experiment teaching better.

Description

Modern communication principle comprehensive experiment device
Technical Field
The utility model relates to a modern communication principle comprehensive experiment device belongs to communication principle experiment improvement technique.
Background
Many colleges and universities have set up communication engineering specialty to be equipped with communication principle experiment teaching system, through the sustainable development of many years, communication principle experimental apparatus (platform) is more and more perfect, and the teaching needs can both be fine in the majority. However, once meeting urgent special circumstances, when the experiment teaching can not be completed in the laboratory, and needs to be transferred to the network platform in a short time, the existing communication principle experimental device (platform) can not meet the needs of remote real-time online teaching, can not meet the needs of students to independently pre-study experiment courses in a remote manner, and is difficult to meet the requirements of diversified experiment teaching. Meanwhile, the existing communication principle experimental device (platform) does not realize increasingly perfect virtual oscilloscope functions in new technology, and does not provide more new measurement display technology and new means for users.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems and the defects of the communication principle experimental device (platform) in colleges and universities in China, the modern communication principle comprehensive experimental device is provided.
The technical scheme of the utility model, an experimental apparatus is synthesized to modern communication principle, experimental apparatus includes main control unit 10, touch-sensitive screen display 11, wireless communication unit 12, USB ethernet interface 13, outside AD acquisition unit 14, user interface unit 15, DDS signal source 16, speech coding/decoding unit 17, exchange and signaling unit 18, multiple access/branching unit 19, HDB3/AMI coding unit 20, Hamming coding/decoding unit 21, special power supply 22, network camera 23 and portable audio amplifier 24 etc..
The touch screen display 11, the wireless communication unit 12, the USB/ethernet interface 13, the external a/D acquisition unit 14, the user interface unit 15, the DDS signal source 16, the voice encoding/decoding unit 17, the switching and signaling unit 18, the multiplexing/demultiplexing unit 19, the HDB3/AMI coding/decoding unit 20, the hamming encoding/decoding unit 21, and the dedicated power supply 22 are all directly controlled by the main controller 10.
The network camera 23 and the portable sound box 24 are designed or externally installed independently, and the main controller 10 controls these units through the dedicated power supply 22.
The wireless communication unit 12 comprises a WIFI module or a bluetooth module, is connected with the mobile terminal in a wireless communication mode, and can realize the function of the oscilloscope by a software method.
The USB/ethernet interface 13 is used to connect a mobile terminal or a desktop computer, and may implement an oscilloscope function by a software method.
The external a/D acquisition unit 14 is used to acquire signals of each signal test point of the experimental apparatus, store the acquired signals, and send the signals to the mobile terminal or the desktop computer through the wireless communication unit 12 or the USB/ethernet interface 13 as required.
The external a/D acquisition unit 14 comprises at least two high-speed high-precision a/D acquisition channels.
The DDS signal source 16 is used to generate high precision function signals required for experiments.
The network camera 23 has a network interface, can be connected to a remote cloud server, and is used for real-time online teaching or remote autonomous experiment course pre-study of students.
The dedicated power supply 22 is used to provide DC12V power to the webcam 23.
The dedicated power supply 22 is used to provide DC5V power to the portable sound box 24.
The portable sound box 24 is used for connecting the network camera 23 to realize the remote talkback function.
The utility model has the advantages of, the practicality and the novelty of experimental apparatus have been embodied to the at utmost, have satisfied the requirement of diversified experiment teaching, have satisfied long-range real-time online teaching needs under the special circumstances, have satisfied the long-range autonomic preview of student experiment course needs. Meanwhile, due to the adoption of the virtual oscilloscope technology, a variety of new measurement display technologies and new means are provided for users.
Drawings
FIG. 1 is a block diagram of the circuit structure of an experimental apparatus
FIG. 2 is a layout diagram of important units of the experimental apparatus
Detailed Description
The preferred embodiments will be described in detail below with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Fig. 1 is a block diagram of a circuit structure of an experimental apparatus, which includes a main controller 10, and the main controller 10 implements functions of various clock signals, various encoding/decoding protocols, various m-sequences, data storage, frame structures, signal filtering, signal synthesis, and the like, which are required by the entire experimental apparatus.
The touch screen display 11 is used for displaying data display or function selection in an operation process, and mainly displays information such as selection of a voice coding and decoding mode, a communication connection state or configuration process, frequency or voltage of a signal output by a DDS signal source, a modulation mode, control of an external A/D acquisition unit, an m sequence, output of a special power supply and the like.
The wireless communication unit 12 comprises a WIFI module or a bluetooth module, and is connected to a mobile terminal in a wireless communication manner, the mobile terminal may be a smart phone, a notebook computer or a tablet computer, the terminals usually do not have an ethernet interface or a USB interface of a specific type, and the acquired data is sent to the mobile terminal by an experimental device, so that the function of the oscilloscope is realized on the mobile terminal by a software method.
The USB/Ethernet interface 13 is used for connecting a mobile terminal or a desktop computer, the USB/Ethernet interface 13 and the wireless communication unit 12 are complementary to each other, in order to adapt to terminal equipment with different communication interface types, and collected data are sent to the mobile terminal or the desktop computer by an experimental device, so that the function of the oscilloscope is realized by a software method.
The external a/D acquisition unit 14 comprises at least two high-speed high-precision a/D acquisition channels. During the experiment, waveforms or data in the experiment are measured according to requirements, so that the waveforms or data are required to be collected. The acquired data is sent to a mobile terminal or a desktop computer through a wireless communication unit 12 or a USB/Ethernet interface 13 according to needs, corresponding software is used on the mobile terminal or the desktop computer to realize the function of a virtual oscilloscope, the desktop oscilloscope can be replaced, and various new measurement display technologies and new means are provided for users.
The user interface unit 15 is used for providing functions of feeding, overvoltage protection, ringing control, monitoring, encoding, decoding, filtering, two/four-wire conversion and the like required by a user interface, and according to design requirements, the user interface unit 15 provides two paths of interface circuits to realize the access of two telephones.
The DDS signal source 16 is used for generating high-precision function signals required by experiments, and some experimental devices can provide the function signals at present, but the DDS signal source is too simple, and the signal precision and the stability can not meet the requirements. The DDS signal source 16 employs a Direct Digital Synthesis (DDS) technique, which greatly improves the frequency stability and accuracy of the function signal and can output various waveforms.
The voice encoding/decoding unit 17 provides a plurality of voice encoding/decoding modes of PAM, PCM, and CVSD, and may select the encoding/decoding mode as needed, and only needs to operate on the touch screen display 11 and select a corresponding jumper line when selecting.
The switching and signaling unit 18 is used for the generation and detection of dual tone multi-frequency signals, the transmission and processing of call signaling, the scanning of user status, and the generation of various audio signals.
The multiplexing/demultiplexing unit 19 is configured to multiplex the frame header, the speech coding signal, the multi-channel switching signal, and the m-sequence signal into a high-speed frame structure; in contrast, tapping is to decompose a high-speed frame signal into a speech coding signal with a relatively low speed, a multi-channel switching signal and an m-sequence signal.
The HDB3/AMI coding and decoding unit 20 is used for converting the multiplexed binary unipolar code into an HDB3 code or an AMI code according to a protocol; otherwise, the HDB3 code or AMI code stream is decoded into binary unipolar code, and a timing signal is extracted at the same time.
The hamming encoding/decoding unit 21 is used for hamming encoding/decoding the voice signal or m-sequence signal of the voice encoding/decoding unit 17, and inserting error codes when transmitting the signal, simulating error code conditions.
The special power supply 22 provides a DC12V power supply for the network camera 23 and a DC5V power supply for the portable sound box 24. When the network camera 23 is required to be used, the main controller 10 controls the dedicated power supply 22 to supply the DC12V power, and when the portable sound box 24 is required to be used, the main controller 10 controls the dedicated power supply 22 to supply the DC5V power.
The network camera 23 is provided with a network interface, is connected with a remote cloud server through the network interface, and is used for real-time video online teaching or remote autonomous student pre-study experiment course requirements.
The portable sound box 24 is used for connecting with an audio interface of the network camera 23, and the network camera 23 is used for realizing a remote talkback function. In special cases, the portable speaker 24 may not be used if the webcam 23 is capable of providing the desired intercom function.
FIG. 2 is a layout diagram of the important units of the experimental apparatus. The touch screen display 11 is arranged at the right lower corner, is embedded on the PCB and is fixed by screws.
The wireless communication unit 12 includes a WIFI module or a bluetooth module, and is disposed in the upper right corner of the experimental apparatus to prevent serious wireless interference to other circuits.
The USB/ethernet interface 13 is used to connect a mobile terminal or a desktop computer, and for conveniently connecting a USB plug or an ethernet RJ45 crystal plug during an experiment, the USB/ethernet interface 13 faces upward (i.e. the interface faces an operator), instead of adopting a horizontal placement mode, the horizontal mode is not easy to connect and remove because the operation space of the circuit board is tightly attached to the horizontal mode.
The external A/D acquisition unit 14 comprises at least two high-speed high-precision A/D acquisition channels, each A/D acquisition channel adopts a BNC (Bayonet Neill-Concelman) joint and is arranged at the lower left corner of the experimental device, the BNC joint faces upwards (namely the interface faces to an operator), and the external A/D acquisition unit can be connected with a standardized desk-top oscilloscope probe to increase the A/D acquisition precision.
The user interface of the user interface unit 15 is an RJ11 connector, which is oriented upward (i.e., the interface is oriented toward the operator) and is also oriented horizontally for easy connection and removal.
The DDS signal source 16 is used for generating high-precision function signals required by experiments, is arranged at the upper left corner of the experimental device according to requirements, and is also provided with a BNC connector, wherein the BNC connector faces upwards (namely the interface faces to an operator) and can be connected with a standardized signal generator probe.
The special power supply 22 is arranged on the outermost side of the lower right corner of the experimental device, and the connector is placed upwards (namely the interface faces to an operator), so that the connection or the removal is convenient.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A modern communication principle comprehensive experiment device is characterized by comprising a main controller (10), a touch screen display (11), a wireless communication unit (12), a USB/Ethernet interface (13), an external A/D acquisition unit (14), a user interface unit (15), a DDS signal source (16), a voice coding/decoding unit (17), an exchange and signaling unit (18), a multiplexing/demultiplexing unit (19), an HDB3/AMI coding/decoding unit (20), a Hamming coding/decoding unit (21), a special power supply (22), a network camera (23), a portable sound box (24) and the like;
the system is characterized in that the touch screen display (11), the wireless communication unit (12), the USB/Ethernet interface (13), the external A/D acquisition unit (14), the user interface unit (15), the DDS signal source (16), the voice coding/decoding unit (17), the switching and signaling unit (18), the multiplexing/demultiplexing unit (19), the HDB3/AMI coding/decoding unit (20), the Hamming coding/decoding unit (21) and the special power supply (22) are directly controlled by the main controller (10);
the portable voice box is characterized in that the network camera (23) and the portable sound box (24) are respectively and independently designed or externally arranged, and the main controller (10) controls the units through a special power supply (22).
2. The experimental device according to claim 1, wherein the wireless communication unit (12) comprises a WIFI module or a Bluetooth module, and is connected with the mobile terminal in a wireless communication manner, so that the oscilloscope function can be realized by a software method.
3. The experimental device according to claim 1, wherein the USB/ethernet interface (13) is used for connecting a mobile terminal or a desktop computer, and an oscilloscope function can be implemented by a software method.
4. The experimental device according to claim 1, wherein the external a/D acquisition unit (14) is used for acquiring signals of each signal test point of the experimental device, storing the signals after acquisition, and sending the signals to the mobile terminal or the desktop computer through the wireless communication unit (12) or the USB/ethernet interface (13) according to requirements.
5. Experimental apparatus according to claim 1, characterized in that said DDS signal source (16) is adapted to generate a function signal of high precision as required.
6. The experimental facility according to claim 1, wherein the network camera (23) has a network interface, and can be connected with a remote cloud server for real-time online teaching or remote autonomous student pre-study of experimental course requirements.
7. Laboratory apparatus according to claim 1, characterized in that the dedicated power supply (22) is used to supply a DC12V power supply to the webcam (23).
8. The experimental apparatus according to claim 1, wherein the dedicated power supply (22) is configured to provide a DC5V power supply to the portable sound box (24).
9. The experimental device according to claim 1, wherein the portable speaker (24) is used for connecting a network camera (23) to realize a remote intercom function.
CN202021600271.8U 2020-08-03 2020-08-03 Modern communication principle comprehensive experiment device Active CN213339293U (en)

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Application Number Priority Date Filing Date Title
CN202021600271.8U CN213339293U (en) 2020-08-03 2020-08-03 Modern communication principle comprehensive experiment device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021600271.8U CN213339293U (en) 2020-08-03 2020-08-03 Modern communication principle comprehensive experiment device

Publications (1)

Publication Number Publication Date
CN213339293U true CN213339293U (en) 2021-06-01

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Country Status (1)

Country Link
CN (1) CN213339293U (en)

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